3727 lines
88 KiB
C
3727 lines
88 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/lib/vsprintf.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
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/*
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* Wirzenius wrote this portably, Torvalds fucked it up :-)
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*/
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/*
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* Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
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* - changed to provide snprintf and vsnprintf functions
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* So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
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* - scnprintf and vscnprintf
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*/
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#include <linux/stdarg.h>
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#include <linux/build_bug.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/errname.h>
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#include <linux/module.h> /* for KSYM_SYMBOL_LEN */
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/kallsyms.h>
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#include <linux/math64.h>
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#include <linux/uaccess.h>
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#include <linux/ioport.h>
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#include <linux/dcache.h>
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#include <linux/cred.h>
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#include <linux/rtc.h>
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#include <linux/sprintf.h>
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#include <linux/time.h>
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#include <linux/uuid.h>
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#include <linux/of.h>
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#include <net/addrconf.h>
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#include <linux/siphash.h>
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#include <linux/compiler.h>
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#include <linux/property.h>
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#include <linux/notifier.h>
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#ifdef CONFIG_BLOCK
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#include <linux/blkdev.h>
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#endif
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#include "../mm/internal.h" /* For the trace_print_flags arrays */
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#include <asm/page.h> /* for PAGE_SIZE */
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#include <asm/byteorder.h> /* cpu_to_le16 */
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#include <asm/unaligned.h>
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#include <linux/string_helpers.h>
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#include "kstrtox.h"
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/* Disable pointer hashing if requested */
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bool no_hash_pointers __ro_after_init;
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EXPORT_SYMBOL_GPL(no_hash_pointers);
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noinline
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static unsigned long long simple_strntoull(const char *startp, char **endp, unsigned int base, size_t max_chars)
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{
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const char *cp;
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unsigned long long result = 0ULL;
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size_t prefix_chars;
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unsigned int rv;
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cp = _parse_integer_fixup_radix(startp, &base);
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prefix_chars = cp - startp;
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if (prefix_chars < max_chars) {
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rv = _parse_integer_limit(cp, base, &result, max_chars - prefix_chars);
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/* FIXME */
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cp += (rv & ~KSTRTOX_OVERFLOW);
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} else {
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/* Field too short for prefix + digit, skip over without converting */
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cp = startp + max_chars;
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}
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if (endp)
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*endp = (char *)cp;
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return result;
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}
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/**
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* simple_strtoull - convert a string to an unsigned long long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function has caveats. Please use kstrtoull instead.
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*/
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noinline
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unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
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{
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return simple_strntoull(cp, endp, base, INT_MAX);
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}
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EXPORT_SYMBOL(simple_strtoull);
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/**
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* simple_strtoul - convert a string to an unsigned long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function has caveats. Please use kstrtoul instead.
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*/
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unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
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{
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return simple_strtoull(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtoul);
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/**
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* simple_strtol - convert a string to a signed long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function has caveats. Please use kstrtol instead.
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*/
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long simple_strtol(const char *cp, char **endp, unsigned int base)
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{
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if (*cp == '-')
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return -simple_strtoul(cp + 1, endp, base);
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return simple_strtoul(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtol);
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noinline
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static long long simple_strntoll(const char *cp, char **endp, unsigned int base, size_t max_chars)
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{
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/*
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* simple_strntoull() safely handles receiving max_chars==0 in the
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* case cp[0] == '-' && max_chars == 1.
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* If max_chars == 0 we can drop through and pass it to simple_strntoull()
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* and the content of *cp is irrelevant.
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*/
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if (*cp == '-' && max_chars > 0)
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return -simple_strntoull(cp + 1, endp, base, max_chars - 1);
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return simple_strntoull(cp, endp, base, max_chars);
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}
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/**
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* simple_strtoll - convert a string to a signed long long
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* @cp: The start of the string
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* @endp: A pointer to the end of the parsed string will be placed here
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* @base: The number base to use
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*
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* This function has caveats. Please use kstrtoll instead.
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*/
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long long simple_strtoll(const char *cp, char **endp, unsigned int base)
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{
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return simple_strntoll(cp, endp, base, INT_MAX);
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}
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EXPORT_SYMBOL(simple_strtoll);
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static noinline_for_stack
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int skip_atoi(const char **s)
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{
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int i = 0;
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do {
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i = i*10 + *((*s)++) - '0';
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} while (isdigit(**s));
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return i;
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}
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/*
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* Decimal conversion is by far the most typical, and is used for
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* /proc and /sys data. This directly impacts e.g. top performance
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* with many processes running. We optimize it for speed by emitting
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* two characters at a time, using a 200 byte lookup table. This
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* roughly halves the number of multiplications compared to computing
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* the digits one at a time. Implementation strongly inspired by the
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* previous version, which in turn used ideas described at
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* <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
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* from the author, Douglas W. Jones).
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*
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* It turns out there is precisely one 26 bit fixed-point
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* approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
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* holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
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* range happens to be somewhat larger (x <= 1073741898), but that's
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* irrelevant for our purpose.
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*
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* For dividing a number in the range [10^4, 10^6-1] by 100, we still
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* need a 32x32->64 bit multiply, so we simply use the same constant.
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*
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* For dividing a number in the range [100, 10^4-1] by 100, there are
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* several options. The simplest is (x * 0x147b) >> 19, which is valid
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* for all x <= 43698.
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*/
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static const u16 decpair[100] = {
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#define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
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_( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
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_(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
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_(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
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_(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
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_(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
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_(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
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_(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
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_(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
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_(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
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_(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
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#undef _
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};
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/*
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* This will print a single '0' even if r == 0, since we would
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* immediately jump to out_r where two 0s would be written but only
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* one of them accounted for in buf. This is needed by ip4_string
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* below. All other callers pass a non-zero value of r.
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*/
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static noinline_for_stack
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char *put_dec_trunc8(char *buf, unsigned r)
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{
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unsigned q;
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/* 1 <= r < 10^8 */
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if (r < 100)
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goto out_r;
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/* 100 <= r < 10^8 */
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q = (r * (u64)0x28f5c29) >> 32;
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*((u16 *)buf) = decpair[r - 100*q];
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buf += 2;
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/* 1 <= q < 10^6 */
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if (q < 100)
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goto out_q;
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/* 100 <= q < 10^6 */
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r = (q * (u64)0x28f5c29) >> 32;
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*((u16 *)buf) = decpair[q - 100*r];
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buf += 2;
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/* 1 <= r < 10^4 */
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if (r < 100)
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goto out_r;
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/* 100 <= r < 10^4 */
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q = (r * 0x147b) >> 19;
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*((u16 *)buf) = decpair[r - 100*q];
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buf += 2;
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out_q:
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/* 1 <= q < 100 */
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r = q;
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out_r:
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/* 1 <= r < 100 */
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*((u16 *)buf) = decpair[r];
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buf += r < 10 ? 1 : 2;
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return buf;
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}
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#if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
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static noinline_for_stack
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char *put_dec_full8(char *buf, unsigned r)
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{
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unsigned q;
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/* 0 <= r < 10^8 */
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q = (r * (u64)0x28f5c29) >> 32;
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*((u16 *)buf) = decpair[r - 100*q];
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buf += 2;
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/* 0 <= q < 10^6 */
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r = (q * (u64)0x28f5c29) >> 32;
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*((u16 *)buf) = decpair[q - 100*r];
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buf += 2;
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/* 0 <= r < 10^4 */
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q = (r * 0x147b) >> 19;
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*((u16 *)buf) = decpair[r - 100*q];
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buf += 2;
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/* 0 <= q < 100 */
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*((u16 *)buf) = decpair[q];
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buf += 2;
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return buf;
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}
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static noinline_for_stack
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char *put_dec(char *buf, unsigned long long n)
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{
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if (n >= 100*1000*1000)
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buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
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/* 1 <= n <= 1.6e11 */
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if (n >= 100*1000*1000)
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buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
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/* 1 <= n < 1e8 */
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return put_dec_trunc8(buf, n);
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}
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#elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
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static void
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put_dec_full4(char *buf, unsigned r)
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{
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unsigned q;
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/* 0 <= r < 10^4 */
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q = (r * 0x147b) >> 19;
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*((u16 *)buf) = decpair[r - 100*q];
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buf += 2;
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/* 0 <= q < 100 */
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*((u16 *)buf) = decpair[q];
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}
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/*
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* Call put_dec_full4 on x % 10000, return x / 10000.
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* The approximation x/10000 == (x * 0x346DC5D7) >> 43
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* holds for all x < 1,128,869,999. The largest value this
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* helper will ever be asked to convert is 1,125,520,955.
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* (second call in the put_dec code, assuming n is all-ones).
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*/
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static noinline_for_stack
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unsigned put_dec_helper4(char *buf, unsigned x)
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{
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uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
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put_dec_full4(buf, x - q * 10000);
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return q;
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}
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/* Based on code by Douglas W. Jones found at
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* <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
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* (with permission from the author).
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* Performs no 64-bit division and hence should be fast on 32-bit machines.
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*/
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static
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char *put_dec(char *buf, unsigned long long n)
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{
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uint32_t d3, d2, d1, q, h;
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if (n < 100*1000*1000)
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return put_dec_trunc8(buf, n);
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d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
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h = (n >> 32);
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d2 = (h ) & 0xffff;
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d3 = (h >> 16); /* implicit "& 0xffff" */
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/* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
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= 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
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q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
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q = put_dec_helper4(buf, q);
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q += 7671 * d3 + 9496 * d2 + 6 * d1;
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q = put_dec_helper4(buf+4, q);
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q += 4749 * d3 + 42 * d2;
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q = put_dec_helper4(buf+8, q);
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q += 281 * d3;
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buf += 12;
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if (q)
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buf = put_dec_trunc8(buf, q);
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else while (buf[-1] == '0')
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--buf;
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return buf;
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}
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#endif
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/*
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* Convert passed number to decimal string.
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* Returns the length of string. On buffer overflow, returns 0.
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*
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* If speed is not important, use snprintf(). It's easy to read the code.
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*/
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int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
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{
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/* put_dec requires 2-byte alignment of the buffer. */
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char tmp[sizeof(num) * 3] __aligned(2);
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int idx, len;
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/* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
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if (num <= 9) {
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tmp[0] = '0' + num;
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len = 1;
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} else {
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len = put_dec(tmp, num) - tmp;
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}
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if (len > size || width > size)
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return 0;
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if (width > len) {
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width = width - len;
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for (idx = 0; idx < width; idx++)
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buf[idx] = ' ';
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} else {
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width = 0;
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}
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for (idx = 0; idx < len; ++idx)
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buf[idx + width] = tmp[len - idx - 1];
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return len + width;
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}
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#define SIGN 1 /* unsigned/signed, must be 1 */
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#define LEFT 2 /* left justified */
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#define PLUS 4 /* show plus */
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#define SPACE 8 /* space if plus */
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#define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
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#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
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#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
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|
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static_assert(SIGN == 1);
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static_assert(ZEROPAD == ('0' - ' '));
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static_assert(SMALL == ('a' ^ 'A'));
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|
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enum format_type {
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FORMAT_TYPE_NONE, /* Just a string part */
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FORMAT_TYPE_WIDTH,
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FORMAT_TYPE_PRECISION,
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FORMAT_TYPE_CHAR,
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FORMAT_TYPE_STR,
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FORMAT_TYPE_PTR,
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FORMAT_TYPE_PERCENT_CHAR,
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FORMAT_TYPE_INVALID,
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FORMAT_TYPE_LONG_LONG,
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FORMAT_TYPE_ULONG,
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FORMAT_TYPE_LONG,
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FORMAT_TYPE_UBYTE,
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FORMAT_TYPE_BYTE,
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FORMAT_TYPE_USHORT,
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FORMAT_TYPE_SHORT,
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|
FORMAT_TYPE_UINT,
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FORMAT_TYPE_INT,
|
|
FORMAT_TYPE_SIZE_T,
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|
FORMAT_TYPE_PTRDIFF
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|
};
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|
|
|
struct printf_spec {
|
|
unsigned int type:8; /* format_type enum */
|
|
signed int field_width:24; /* width of output field */
|
|
unsigned int flags:8; /* flags to number() */
|
|
unsigned int base:8; /* number base, 8, 10 or 16 only */
|
|
signed int precision:16; /* # of digits/chars */
|
|
} __packed;
|
|
static_assert(sizeof(struct printf_spec) == 8);
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|
|
#define FIELD_WIDTH_MAX ((1 << 23) - 1)
|
|
#define PRECISION_MAX ((1 << 15) - 1)
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|
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static noinline_for_stack
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|
char *number(char *buf, char *end, unsigned long long num,
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|
struct printf_spec spec)
|
|
{
|
|
/* put_dec requires 2-byte alignment of the buffer. */
|
|
char tmp[3 * sizeof(num)] __aligned(2);
|
|
char sign;
|
|
char locase;
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|
int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
|
|
int i;
|
|
bool is_zero = num == 0LL;
|
|
int field_width = spec.field_width;
|
|
int precision = spec.precision;
|
|
|
|
/* locase = 0 or 0x20. ORing digits or letters with 'locase'
|
|
* produces same digits or (maybe lowercased) letters */
|
|
locase = (spec.flags & SMALL);
|
|
if (spec.flags & LEFT)
|
|
spec.flags &= ~ZEROPAD;
|
|
sign = 0;
|
|
if (spec.flags & SIGN) {
|
|
if ((signed long long)num < 0) {
|
|
sign = '-';
|
|
num = -(signed long long)num;
|
|
field_width--;
|
|
} else if (spec.flags & PLUS) {
|
|
sign = '+';
|
|
field_width--;
|
|
} else if (spec.flags & SPACE) {
|
|
sign = ' ';
|
|
field_width--;
|
|
}
|
|
}
|
|
if (need_pfx) {
|
|
if (spec.base == 16)
|
|
field_width -= 2;
|
|
else if (!is_zero)
|
|
field_width--;
|
|
}
|
|
|
|
/* generate full string in tmp[], in reverse order */
|
|
i = 0;
|
|
if (num < spec.base)
|
|
tmp[i++] = hex_asc_upper[num] | locase;
|
|
else if (spec.base != 10) { /* 8 or 16 */
|
|
int mask = spec.base - 1;
|
|
int shift = 3;
|
|
|
|
if (spec.base == 16)
|
|
shift = 4;
|
|
do {
|
|
tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
|
|
num >>= shift;
|
|
} while (num);
|
|
} else { /* base 10 */
|
|
i = put_dec(tmp, num) - tmp;
|
|
}
|
|
|
|
/* printing 100 using %2d gives "100", not "00" */
|
|
if (i > precision)
|
|
precision = i;
|
|
/* leading space padding */
|
|
field_width -= precision;
|
|
if (!(spec.flags & (ZEROPAD | LEFT))) {
|
|
while (--field_width >= 0) {
|
|
if (buf < end)
|
|
*buf = ' ';
|
|
++buf;
|
|
}
|
|
}
|
|
/* sign */
|
|
if (sign) {
|
|
if (buf < end)
|
|
*buf = sign;
|
|
++buf;
|
|
}
|
|
/* "0x" / "0" prefix */
|
|
if (need_pfx) {
|
|
if (spec.base == 16 || !is_zero) {
|
|
if (buf < end)
|
|
*buf = '0';
|
|
++buf;
|
|
}
|
|
if (spec.base == 16) {
|
|
if (buf < end)
|
|
*buf = ('X' | locase);
|
|
++buf;
|
|
}
|
|
}
|
|
/* zero or space padding */
|
|
if (!(spec.flags & LEFT)) {
|
|
char c = ' ' + (spec.flags & ZEROPAD);
|
|
|
|
while (--field_width >= 0) {
|
|
if (buf < end)
|
|
*buf = c;
|
|
++buf;
|
|
}
|
|
}
|
|
/* hmm even more zero padding? */
|
|
while (i <= --precision) {
|
|
if (buf < end)
|
|
*buf = '0';
|
|
++buf;
|
|
}
|
|
/* actual digits of result */
|
|
while (--i >= 0) {
|
|
if (buf < end)
|
|
*buf = tmp[i];
|
|
++buf;
|
|
}
|
|
/* trailing space padding */
|
|
while (--field_width >= 0) {
|
|
if (buf < end)
|
|
*buf = ' ';
|
|
++buf;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
|
|
{
|
|
struct printf_spec spec;
|
|
|
|
spec.type = FORMAT_TYPE_PTR;
|
|
spec.field_width = 2 + 2 * size; /* 0x + hex */
|
|
spec.flags = SPECIAL | SMALL | ZEROPAD;
|
|
spec.base = 16;
|
|
spec.precision = -1;
|
|
|
|
return number(buf, end, num, spec);
|
|
}
|
|
|
|
static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
|
|
{
|
|
size_t size;
|
|
if (buf >= end) /* nowhere to put anything */
|
|
return;
|
|
size = end - buf;
|
|
if (size <= spaces) {
|
|
memset(buf, ' ', size);
|
|
return;
|
|
}
|
|
if (len) {
|
|
if (len > size - spaces)
|
|
len = size - spaces;
|
|
memmove(buf + spaces, buf, len);
|
|
}
|
|
memset(buf, ' ', spaces);
|
|
}
|
|
|
|
/*
|
|
* Handle field width padding for a string.
|
|
* @buf: current buffer position
|
|
* @n: length of string
|
|
* @end: end of output buffer
|
|
* @spec: for field width and flags
|
|
* Returns: new buffer position after padding.
|
|
*/
|
|
static noinline_for_stack
|
|
char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
|
|
{
|
|
unsigned spaces;
|
|
|
|
if (likely(n >= spec.field_width))
|
|
return buf;
|
|
/* we want to pad the sucker */
|
|
spaces = spec.field_width - n;
|
|
if (!(spec.flags & LEFT)) {
|
|
move_right(buf - n, end, n, spaces);
|
|
return buf + spaces;
|
|
}
|
|
while (spaces--) {
|
|
if (buf < end)
|
|
*buf = ' ';
|
|
++buf;
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
/* Handle string from a well known address. */
|
|
static char *string_nocheck(char *buf, char *end, const char *s,
|
|
struct printf_spec spec)
|
|
{
|
|
int len = 0;
|
|
int lim = spec.precision;
|
|
|
|
while (lim--) {
|
|
char c = *s++;
|
|
if (!c)
|
|
break;
|
|
if (buf < end)
|
|
*buf = c;
|
|
++buf;
|
|
++len;
|
|
}
|
|
return widen_string(buf, len, end, spec);
|
|
}
|
|
|
|
static char *err_ptr(char *buf, char *end, void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
int err = PTR_ERR(ptr);
|
|
const char *sym = errname(err);
|
|
|
|
if (sym)
|
|
return string_nocheck(buf, end, sym, spec);
|
|
|
|
/*
|
|
* Somebody passed ERR_PTR(-1234) or some other non-existing
|
|
* Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to
|
|
* printing it as its decimal representation.
|
|
*/
|
|
spec.flags |= SIGN;
|
|
spec.base = 10;
|
|
return number(buf, end, err, spec);
|
|
}
|
|
|
|
/* Be careful: error messages must fit into the given buffer. */
|
|
static char *error_string(char *buf, char *end, const char *s,
|
|
struct printf_spec spec)
|
|
{
|
|
/*
|
|
* Hard limit to avoid a completely insane messages. It actually
|
|
* works pretty well because most error messages are in
|
|
* the many pointer format modifiers.
|
|
*/
|
|
if (spec.precision == -1)
|
|
spec.precision = 2 * sizeof(void *);
|
|
|
|
return string_nocheck(buf, end, s, spec);
|
|
}
|
|
|
|
/*
|
|
* Do not call any complex external code here. Nested printk()/vsprintf()
|
|
* might cause infinite loops. Failures might break printk() and would
|
|
* be hard to debug.
|
|
*/
|
|
static const char *check_pointer_msg(const void *ptr)
|
|
{
|
|
if (!ptr)
|
|
return "(null)";
|
|
|
|
if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
|
|
return "(efault)";
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int check_pointer(char **buf, char *end, const void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
const char *err_msg;
|
|
|
|
err_msg = check_pointer_msg(ptr);
|
|
if (err_msg) {
|
|
*buf = error_string(*buf, end, err_msg, spec);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *string(char *buf, char *end, const char *s,
|
|
struct printf_spec spec)
|
|
{
|
|
if (check_pointer(&buf, end, s, spec))
|
|
return buf;
|
|
|
|
return string_nocheck(buf, end, s, spec);
|
|
}
|
|
|
|
static char *pointer_string(char *buf, char *end,
|
|
const void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
spec.base = 16;
|
|
spec.flags |= SMALL;
|
|
if (spec.field_width == -1) {
|
|
spec.field_width = 2 * sizeof(ptr);
|
|
spec.flags |= ZEROPAD;
|
|
}
|
|
|
|
return number(buf, end, (unsigned long int)ptr, spec);
|
|
}
|
|
|
|
/* Make pointers available for printing early in the boot sequence. */
|
|
static int debug_boot_weak_hash __ro_after_init;
|
|
|
|
static int __init debug_boot_weak_hash_enable(char *str)
|
|
{
|
|
debug_boot_weak_hash = 1;
|
|
pr_info("debug_boot_weak_hash enabled\n");
|
|
return 0;
|
|
}
|
|
early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
|
|
|
|
static bool filled_random_ptr_key __read_mostly;
|
|
static siphash_key_t ptr_key __read_mostly;
|
|
|
|
static int fill_ptr_key(struct notifier_block *nb, unsigned long action, void *data)
|
|
{
|
|
get_random_bytes(&ptr_key, sizeof(ptr_key));
|
|
|
|
/* Pairs with smp_rmb() before reading ptr_key. */
|
|
smp_wmb();
|
|
WRITE_ONCE(filled_random_ptr_key, true);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int __init vsprintf_init_hashval(void)
|
|
{
|
|
static struct notifier_block fill_ptr_key_nb = { .notifier_call = fill_ptr_key };
|
|
execute_with_initialized_rng(&fill_ptr_key_nb);
|
|
return 0;
|
|
}
|
|
subsys_initcall(vsprintf_init_hashval)
|
|
|
|
/* Maps a pointer to a 32 bit unique identifier. */
|
|
static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
|
|
{
|
|
unsigned long hashval;
|
|
|
|
if (!READ_ONCE(filled_random_ptr_key))
|
|
return -EBUSY;
|
|
|
|
/* Pairs with smp_wmb() after writing ptr_key. */
|
|
smp_rmb();
|
|
|
|
#ifdef CONFIG_64BIT
|
|
hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
|
|
/*
|
|
* Mask off the first 32 bits, this makes explicit that we have
|
|
* modified the address (and 32 bits is plenty for a unique ID).
|
|
*/
|
|
hashval = hashval & 0xffffffff;
|
|
#else
|
|
hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
|
|
#endif
|
|
*hashval_out = hashval;
|
|
return 0;
|
|
}
|
|
|
|
int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
|
|
{
|
|
return __ptr_to_hashval(ptr, hashval_out);
|
|
}
|
|
|
|
static char *ptr_to_id(char *buf, char *end, const void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
|
|
unsigned long hashval;
|
|
int ret;
|
|
|
|
/*
|
|
* Print the real pointer value for NULL and error pointers,
|
|
* as they are not actual addresses.
|
|
*/
|
|
if (IS_ERR_OR_NULL(ptr))
|
|
return pointer_string(buf, end, ptr, spec);
|
|
|
|
/* When debugging early boot use non-cryptographically secure hash. */
|
|
if (unlikely(debug_boot_weak_hash)) {
|
|
hashval = hash_long((unsigned long)ptr, 32);
|
|
return pointer_string(buf, end, (const void *)hashval, spec);
|
|
}
|
|
|
|
ret = __ptr_to_hashval(ptr, &hashval);
|
|
if (ret) {
|
|
spec.field_width = 2 * sizeof(ptr);
|
|
/* string length must be less than default_width */
|
|
return error_string(buf, end, str, spec);
|
|
}
|
|
|
|
return pointer_string(buf, end, (const void *)hashval, spec);
|
|
}
|
|
|
|
static char *default_pointer(char *buf, char *end, const void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
/*
|
|
* default is to _not_ leak addresses, so hash before printing,
|
|
* unless no_hash_pointers is specified on the command line.
|
|
*/
|
|
if (unlikely(no_hash_pointers))
|
|
return pointer_string(buf, end, ptr, spec);
|
|
|
|
return ptr_to_id(buf, end, ptr, spec);
|
|
}
|
|
|
|
int kptr_restrict __read_mostly;
|
|
|
|
static noinline_for_stack
|
|
char *restricted_pointer(char *buf, char *end, const void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
switch (kptr_restrict) {
|
|
case 0:
|
|
/* Handle as %p, hash and do _not_ leak addresses. */
|
|
return default_pointer(buf, end, ptr, spec);
|
|
case 1: {
|
|
const struct cred *cred;
|
|
|
|
/*
|
|
* kptr_restrict==1 cannot be used in IRQ context
|
|
* because its test for CAP_SYSLOG would be meaningless.
|
|
*/
|
|
if (in_hardirq() || in_serving_softirq() || in_nmi()) {
|
|
if (spec.field_width == -1)
|
|
spec.field_width = 2 * sizeof(ptr);
|
|
return error_string(buf, end, "pK-error", spec);
|
|
}
|
|
|
|
/*
|
|
* Only print the real pointer value if the current
|
|
* process has CAP_SYSLOG and is running with the
|
|
* same credentials it started with. This is because
|
|
* access to files is checked at open() time, but %pK
|
|
* checks permission at read() time. We don't want to
|
|
* leak pointer values if a binary opens a file using
|
|
* %pK and then elevates privileges before reading it.
|
|
*/
|
|
cred = current_cred();
|
|
if (!has_capability_noaudit(current, CAP_SYSLOG) ||
|
|
!uid_eq(cred->euid, cred->uid) ||
|
|
!gid_eq(cred->egid, cred->gid))
|
|
ptr = NULL;
|
|
break;
|
|
}
|
|
case 2:
|
|
default:
|
|
/* Always print 0's for %pK */
|
|
ptr = NULL;
|
|
break;
|
|
}
|
|
|
|
return pointer_string(buf, end, ptr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
|
|
const char *fmt)
|
|
{
|
|
const char *array[4], *s;
|
|
const struct dentry *p;
|
|
int depth;
|
|
int i, n;
|
|
|
|
switch (fmt[1]) {
|
|
case '2': case '3': case '4':
|
|
depth = fmt[1] - '0';
|
|
break;
|
|
default:
|
|
depth = 1;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
for (i = 0; i < depth; i++, d = p) {
|
|
if (check_pointer(&buf, end, d, spec)) {
|
|
rcu_read_unlock();
|
|
return buf;
|
|
}
|
|
|
|
p = READ_ONCE(d->d_parent);
|
|
array[i] = READ_ONCE(d->d_name.name);
|
|
if (p == d) {
|
|
if (i)
|
|
array[i] = "";
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
s = array[--i];
|
|
for (n = 0; n != spec.precision; n++, buf++) {
|
|
char c = *s++;
|
|
if (!c) {
|
|
if (!i)
|
|
break;
|
|
c = '/';
|
|
s = array[--i];
|
|
}
|
|
if (buf < end)
|
|
*buf = c;
|
|
}
|
|
rcu_read_unlock();
|
|
return widen_string(buf, n, end, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *file_dentry_name(char *buf, char *end, const struct file *f,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
if (check_pointer(&buf, end, f, spec))
|
|
return buf;
|
|
|
|
return dentry_name(buf, end, f->f_path.dentry, spec, fmt);
|
|
}
|
|
#ifdef CONFIG_BLOCK
|
|
static noinline_for_stack
|
|
char *bdev_name(char *buf, char *end, struct block_device *bdev,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
struct gendisk *hd;
|
|
|
|
if (check_pointer(&buf, end, bdev, spec))
|
|
return buf;
|
|
|
|
hd = bdev->bd_disk;
|
|
buf = string(buf, end, hd->disk_name, spec);
|
|
if (bdev->bd_partno) {
|
|
if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
|
|
if (buf < end)
|
|
*buf = 'p';
|
|
buf++;
|
|
}
|
|
buf = number(buf, end, bdev->bd_partno, spec);
|
|
}
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
static noinline_for_stack
|
|
char *symbol_string(char *buf, char *end, void *ptr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
unsigned long value;
|
|
#ifdef CONFIG_KALLSYMS
|
|
char sym[KSYM_SYMBOL_LEN];
|
|
#endif
|
|
|
|
if (fmt[1] == 'R')
|
|
ptr = __builtin_extract_return_addr(ptr);
|
|
value = (unsigned long)ptr;
|
|
|
|
#ifdef CONFIG_KALLSYMS
|
|
if (*fmt == 'B' && fmt[1] == 'b')
|
|
sprint_backtrace_build_id(sym, value);
|
|
else if (*fmt == 'B')
|
|
sprint_backtrace(sym, value);
|
|
else if (*fmt == 'S' && (fmt[1] == 'b' || (fmt[1] == 'R' && fmt[2] == 'b')))
|
|
sprint_symbol_build_id(sym, value);
|
|
else if (*fmt != 's')
|
|
sprint_symbol(sym, value);
|
|
else
|
|
sprint_symbol_no_offset(sym, value);
|
|
|
|
return string_nocheck(buf, end, sym, spec);
|
|
#else
|
|
return special_hex_number(buf, end, value, sizeof(void *));
|
|
#endif
|
|
}
|
|
|
|
static const struct printf_spec default_str_spec = {
|
|
.field_width = -1,
|
|
.precision = -1,
|
|
};
|
|
|
|
static const struct printf_spec default_flag_spec = {
|
|
.base = 16,
|
|
.precision = -1,
|
|
.flags = SPECIAL | SMALL,
|
|
};
|
|
|
|
static const struct printf_spec default_dec_spec = {
|
|
.base = 10,
|
|
.precision = -1,
|
|
};
|
|
|
|
static const struct printf_spec default_dec02_spec = {
|
|
.base = 10,
|
|
.field_width = 2,
|
|
.precision = -1,
|
|
.flags = ZEROPAD,
|
|
};
|
|
|
|
static const struct printf_spec default_dec04_spec = {
|
|
.base = 10,
|
|
.field_width = 4,
|
|
.precision = -1,
|
|
.flags = ZEROPAD,
|
|
};
|
|
|
|
static noinline_for_stack
|
|
char *resource_string(char *buf, char *end, struct resource *res,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
#ifndef IO_RSRC_PRINTK_SIZE
|
|
#define IO_RSRC_PRINTK_SIZE 6
|
|
#endif
|
|
|
|
#ifndef MEM_RSRC_PRINTK_SIZE
|
|
#define MEM_RSRC_PRINTK_SIZE 10
|
|
#endif
|
|
static const struct printf_spec io_spec = {
|
|
.base = 16,
|
|
.field_width = IO_RSRC_PRINTK_SIZE,
|
|
.precision = -1,
|
|
.flags = SPECIAL | SMALL | ZEROPAD,
|
|
};
|
|
static const struct printf_spec mem_spec = {
|
|
.base = 16,
|
|
.field_width = MEM_RSRC_PRINTK_SIZE,
|
|
.precision = -1,
|
|
.flags = SPECIAL | SMALL | ZEROPAD,
|
|
};
|
|
static const struct printf_spec bus_spec = {
|
|
.base = 16,
|
|
.field_width = 2,
|
|
.precision = -1,
|
|
.flags = SMALL | ZEROPAD,
|
|
};
|
|
static const struct printf_spec str_spec = {
|
|
.field_width = -1,
|
|
.precision = 10,
|
|
.flags = LEFT,
|
|
};
|
|
|
|
/* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
|
|
* 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
|
|
#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
|
|
#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
|
|
#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
|
|
#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
|
|
char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
|
|
2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
|
|
|
|
char *p = sym, *pend = sym + sizeof(sym);
|
|
int decode = (fmt[0] == 'R') ? 1 : 0;
|
|
const struct printf_spec *specp;
|
|
|
|
if (check_pointer(&buf, end, res, spec))
|
|
return buf;
|
|
|
|
*p++ = '[';
|
|
if (res->flags & IORESOURCE_IO) {
|
|
p = string_nocheck(p, pend, "io ", str_spec);
|
|
specp = &io_spec;
|
|
} else if (res->flags & IORESOURCE_MEM) {
|
|
p = string_nocheck(p, pend, "mem ", str_spec);
|
|
specp = &mem_spec;
|
|
} else if (res->flags & IORESOURCE_IRQ) {
|
|
p = string_nocheck(p, pend, "irq ", str_spec);
|
|
specp = &default_dec_spec;
|
|
} else if (res->flags & IORESOURCE_DMA) {
|
|
p = string_nocheck(p, pend, "dma ", str_spec);
|
|
specp = &default_dec_spec;
|
|
} else if (res->flags & IORESOURCE_BUS) {
|
|
p = string_nocheck(p, pend, "bus ", str_spec);
|
|
specp = &bus_spec;
|
|
} else {
|
|
p = string_nocheck(p, pend, "??? ", str_spec);
|
|
specp = &mem_spec;
|
|
decode = 0;
|
|
}
|
|
if (decode && res->flags & IORESOURCE_UNSET) {
|
|
p = string_nocheck(p, pend, "size ", str_spec);
|
|
p = number(p, pend, resource_size(res), *specp);
|
|
} else {
|
|
p = number(p, pend, res->start, *specp);
|
|
if (res->start != res->end) {
|
|
*p++ = '-';
|
|
p = number(p, pend, res->end, *specp);
|
|
}
|
|
}
|
|
if (decode) {
|
|
if (res->flags & IORESOURCE_MEM_64)
|
|
p = string_nocheck(p, pend, " 64bit", str_spec);
|
|
if (res->flags & IORESOURCE_PREFETCH)
|
|
p = string_nocheck(p, pend, " pref", str_spec);
|
|
if (res->flags & IORESOURCE_WINDOW)
|
|
p = string_nocheck(p, pend, " window", str_spec);
|
|
if (res->flags & IORESOURCE_DISABLED)
|
|
p = string_nocheck(p, pend, " disabled", str_spec);
|
|
} else {
|
|
p = string_nocheck(p, pend, " flags ", str_spec);
|
|
p = number(p, pend, res->flags, default_flag_spec);
|
|
}
|
|
*p++ = ']';
|
|
*p = '\0';
|
|
|
|
return string_nocheck(buf, end, sym, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
|
|
const char *fmt)
|
|
{
|
|
int i, len = 1; /* if we pass '%ph[CDN]', field width remains
|
|
negative value, fallback to the default */
|
|
char separator;
|
|
|
|
if (spec.field_width == 0)
|
|
/* nothing to print */
|
|
return buf;
|
|
|
|
if (check_pointer(&buf, end, addr, spec))
|
|
return buf;
|
|
|
|
switch (fmt[1]) {
|
|
case 'C':
|
|
separator = ':';
|
|
break;
|
|
case 'D':
|
|
separator = '-';
|
|
break;
|
|
case 'N':
|
|
separator = 0;
|
|
break;
|
|
default:
|
|
separator = ' ';
|
|
break;
|
|
}
|
|
|
|
if (spec.field_width > 0)
|
|
len = min_t(int, spec.field_width, 64);
|
|
|
|
for (i = 0; i < len; ++i) {
|
|
if (buf < end)
|
|
*buf = hex_asc_hi(addr[i]);
|
|
++buf;
|
|
if (buf < end)
|
|
*buf = hex_asc_lo(addr[i]);
|
|
++buf;
|
|
|
|
if (separator && i != len - 1) {
|
|
if (buf < end)
|
|
*buf = separator;
|
|
++buf;
|
|
}
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *bitmap_string(char *buf, char *end, const unsigned long *bitmap,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
const int CHUNKSZ = 32;
|
|
int nr_bits = max_t(int, spec.field_width, 0);
|
|
int i, chunksz;
|
|
bool first = true;
|
|
|
|
if (check_pointer(&buf, end, bitmap, spec))
|
|
return buf;
|
|
|
|
/* reused to print numbers */
|
|
spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
|
|
|
|
chunksz = nr_bits & (CHUNKSZ - 1);
|
|
if (chunksz == 0)
|
|
chunksz = CHUNKSZ;
|
|
|
|
i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
|
|
for (; i >= 0; i -= CHUNKSZ) {
|
|
u32 chunkmask, val;
|
|
int word, bit;
|
|
|
|
chunkmask = ((1ULL << chunksz) - 1);
|
|
word = i / BITS_PER_LONG;
|
|
bit = i % BITS_PER_LONG;
|
|
val = (bitmap[word] >> bit) & chunkmask;
|
|
|
|
if (!first) {
|
|
if (buf < end)
|
|
*buf = ',';
|
|
buf++;
|
|
}
|
|
first = false;
|
|
|
|
spec.field_width = DIV_ROUND_UP(chunksz, 4);
|
|
buf = number(buf, end, val, spec);
|
|
|
|
chunksz = CHUNKSZ;
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *bitmap_list_string(char *buf, char *end, const unsigned long *bitmap,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
int nr_bits = max_t(int, spec.field_width, 0);
|
|
bool first = true;
|
|
int rbot, rtop;
|
|
|
|
if (check_pointer(&buf, end, bitmap, spec))
|
|
return buf;
|
|
|
|
for_each_set_bitrange(rbot, rtop, bitmap, nr_bits) {
|
|
if (!first) {
|
|
if (buf < end)
|
|
*buf = ',';
|
|
buf++;
|
|
}
|
|
first = false;
|
|
|
|
buf = number(buf, end, rbot, default_dec_spec);
|
|
if (rtop == rbot + 1)
|
|
continue;
|
|
|
|
if (buf < end)
|
|
*buf = '-';
|
|
buf = number(++buf, end, rtop - 1, default_dec_spec);
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *mac_address_string(char *buf, char *end, u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
|
|
char *p = mac_addr;
|
|
int i;
|
|
char separator;
|
|
bool reversed = false;
|
|
|
|
if (check_pointer(&buf, end, addr, spec))
|
|
return buf;
|
|
|
|
switch (fmt[1]) {
|
|
case 'F':
|
|
separator = '-';
|
|
break;
|
|
|
|
case 'R':
|
|
reversed = true;
|
|
fallthrough;
|
|
|
|
default:
|
|
separator = ':';
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
if (reversed)
|
|
p = hex_byte_pack(p, addr[5 - i]);
|
|
else
|
|
p = hex_byte_pack(p, addr[i]);
|
|
|
|
if (fmt[0] == 'M' && i != 5)
|
|
*p++ = separator;
|
|
}
|
|
*p = '\0';
|
|
|
|
return string_nocheck(buf, end, mac_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip4_string(char *p, const u8 *addr, const char *fmt)
|
|
{
|
|
int i;
|
|
bool leading_zeros = (fmt[0] == 'i');
|
|
int index;
|
|
int step;
|
|
|
|
switch (fmt[2]) {
|
|
case 'h':
|
|
#ifdef __BIG_ENDIAN
|
|
index = 0;
|
|
step = 1;
|
|
#else
|
|
index = 3;
|
|
step = -1;
|
|
#endif
|
|
break;
|
|
case 'l':
|
|
index = 3;
|
|
step = -1;
|
|
break;
|
|
case 'n':
|
|
case 'b':
|
|
default:
|
|
index = 0;
|
|
step = 1;
|
|
break;
|
|
}
|
|
for (i = 0; i < 4; i++) {
|
|
char temp[4] __aligned(2); /* hold each IP quad in reverse order */
|
|
int digits = put_dec_trunc8(temp, addr[index]) - temp;
|
|
if (leading_zeros) {
|
|
if (digits < 3)
|
|
*p++ = '0';
|
|
if (digits < 2)
|
|
*p++ = '0';
|
|
}
|
|
/* reverse the digits in the quad */
|
|
while (digits--)
|
|
*p++ = temp[digits];
|
|
if (i < 3)
|
|
*p++ = '.';
|
|
index += step;
|
|
}
|
|
*p = '\0';
|
|
|
|
return p;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip6_compressed_string(char *p, const char *addr)
|
|
{
|
|
int i, j, range;
|
|
unsigned char zerolength[8];
|
|
int longest = 1;
|
|
int colonpos = -1;
|
|
u16 word;
|
|
u8 hi, lo;
|
|
bool needcolon = false;
|
|
bool useIPv4;
|
|
struct in6_addr in6;
|
|
|
|
memcpy(&in6, addr, sizeof(struct in6_addr));
|
|
|
|
useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
|
|
|
|
memset(zerolength, 0, sizeof(zerolength));
|
|
|
|
if (useIPv4)
|
|
range = 6;
|
|
else
|
|
range = 8;
|
|
|
|
/* find position of longest 0 run */
|
|
for (i = 0; i < range; i++) {
|
|
for (j = i; j < range; j++) {
|
|
if (in6.s6_addr16[j] != 0)
|
|
break;
|
|
zerolength[i]++;
|
|
}
|
|
}
|
|
for (i = 0; i < range; i++) {
|
|
if (zerolength[i] > longest) {
|
|
longest = zerolength[i];
|
|
colonpos = i;
|
|
}
|
|
}
|
|
if (longest == 1) /* don't compress a single 0 */
|
|
colonpos = -1;
|
|
|
|
/* emit address */
|
|
for (i = 0; i < range; i++) {
|
|
if (i == colonpos) {
|
|
if (needcolon || i == 0)
|
|
*p++ = ':';
|
|
*p++ = ':';
|
|
needcolon = false;
|
|
i += longest - 1;
|
|
continue;
|
|
}
|
|
if (needcolon) {
|
|
*p++ = ':';
|
|
needcolon = false;
|
|
}
|
|
/* hex u16 without leading 0s */
|
|
word = ntohs(in6.s6_addr16[i]);
|
|
hi = word >> 8;
|
|
lo = word & 0xff;
|
|
if (hi) {
|
|
if (hi > 0x0f)
|
|
p = hex_byte_pack(p, hi);
|
|
else
|
|
*p++ = hex_asc_lo(hi);
|
|
p = hex_byte_pack(p, lo);
|
|
}
|
|
else if (lo > 0x0f)
|
|
p = hex_byte_pack(p, lo);
|
|
else
|
|
*p++ = hex_asc_lo(lo);
|
|
needcolon = true;
|
|
}
|
|
|
|
if (useIPv4) {
|
|
if (needcolon)
|
|
*p++ = ':';
|
|
p = ip4_string(p, &in6.s6_addr[12], "I4");
|
|
}
|
|
*p = '\0';
|
|
|
|
return p;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip6_string(char *p, const char *addr, const char *fmt)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
p = hex_byte_pack(p, *addr++);
|
|
p = hex_byte_pack(p, *addr++);
|
|
if (fmt[0] == 'I' && i != 7)
|
|
*p++ = ':';
|
|
}
|
|
*p = '\0';
|
|
|
|
return p;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip6_addr_string(char *buf, char *end, const u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
|
|
|
|
if (fmt[0] == 'I' && fmt[2] == 'c')
|
|
ip6_compressed_string(ip6_addr, addr);
|
|
else
|
|
ip6_string(ip6_addr, addr, fmt);
|
|
|
|
return string_nocheck(buf, end, ip6_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip4_addr_string(char *buf, char *end, const u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char ip4_addr[sizeof("255.255.255.255")];
|
|
|
|
ip4_string(ip4_addr, addr, fmt);
|
|
|
|
return string_nocheck(buf, end, ip4_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
bool have_p = false, have_s = false, have_f = false, have_c = false;
|
|
char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
|
|
sizeof(":12345") + sizeof("/123456789") +
|
|
sizeof("%1234567890")];
|
|
char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
|
|
const u8 *addr = (const u8 *) &sa->sin6_addr;
|
|
char fmt6[2] = { fmt[0], '6' };
|
|
u8 off = 0;
|
|
|
|
fmt++;
|
|
while (isalpha(*++fmt)) {
|
|
switch (*fmt) {
|
|
case 'p':
|
|
have_p = true;
|
|
break;
|
|
case 'f':
|
|
have_f = true;
|
|
break;
|
|
case 's':
|
|
have_s = true;
|
|
break;
|
|
case 'c':
|
|
have_c = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (have_p || have_s || have_f) {
|
|
*p = '[';
|
|
off = 1;
|
|
}
|
|
|
|
if (fmt6[0] == 'I' && have_c)
|
|
p = ip6_compressed_string(ip6_addr + off, addr);
|
|
else
|
|
p = ip6_string(ip6_addr + off, addr, fmt6);
|
|
|
|
if (have_p || have_s || have_f)
|
|
*p++ = ']';
|
|
|
|
if (have_p) {
|
|
*p++ = ':';
|
|
p = number(p, pend, ntohs(sa->sin6_port), spec);
|
|
}
|
|
if (have_f) {
|
|
*p++ = '/';
|
|
p = number(p, pend, ntohl(sa->sin6_flowinfo &
|
|
IPV6_FLOWINFO_MASK), spec);
|
|
}
|
|
if (have_s) {
|
|
*p++ = '%';
|
|
p = number(p, pend, sa->sin6_scope_id, spec);
|
|
}
|
|
*p = '\0';
|
|
|
|
return string_nocheck(buf, end, ip6_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
bool have_p = false;
|
|
char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
|
|
char *pend = ip4_addr + sizeof(ip4_addr);
|
|
const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
|
|
char fmt4[3] = { fmt[0], '4', 0 };
|
|
|
|
fmt++;
|
|
while (isalpha(*++fmt)) {
|
|
switch (*fmt) {
|
|
case 'p':
|
|
have_p = true;
|
|
break;
|
|
case 'h':
|
|
case 'l':
|
|
case 'n':
|
|
case 'b':
|
|
fmt4[2] = *fmt;
|
|
break;
|
|
}
|
|
}
|
|
|
|
p = ip4_string(ip4_addr, addr, fmt4);
|
|
if (have_p) {
|
|
*p++ = ':';
|
|
p = number(p, pend, ntohs(sa->sin_port), spec);
|
|
}
|
|
*p = '\0';
|
|
|
|
return string_nocheck(buf, end, ip4_addr, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *ip_addr_string(char *buf, char *end, const void *ptr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char *err_fmt_msg;
|
|
|
|
if (check_pointer(&buf, end, ptr, spec))
|
|
return buf;
|
|
|
|
switch (fmt[1]) {
|
|
case '6':
|
|
return ip6_addr_string(buf, end, ptr, spec, fmt);
|
|
case '4':
|
|
return ip4_addr_string(buf, end, ptr, spec, fmt);
|
|
case 'S': {
|
|
const union {
|
|
struct sockaddr raw;
|
|
struct sockaddr_in v4;
|
|
struct sockaddr_in6 v6;
|
|
} *sa = ptr;
|
|
|
|
switch (sa->raw.sa_family) {
|
|
case AF_INET:
|
|
return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
|
|
case AF_INET6:
|
|
return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
|
|
default:
|
|
return error_string(buf, end, "(einval)", spec);
|
|
}}
|
|
}
|
|
|
|
err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
|
|
return error_string(buf, end, err_fmt_msg, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
|
|
const char *fmt)
|
|
{
|
|
bool found = true;
|
|
int count = 1;
|
|
unsigned int flags = 0;
|
|
int len;
|
|
|
|
if (spec.field_width == 0)
|
|
return buf; /* nothing to print */
|
|
|
|
if (check_pointer(&buf, end, addr, spec))
|
|
return buf;
|
|
|
|
do {
|
|
switch (fmt[count++]) {
|
|
case 'a':
|
|
flags |= ESCAPE_ANY;
|
|
break;
|
|
case 'c':
|
|
flags |= ESCAPE_SPECIAL;
|
|
break;
|
|
case 'h':
|
|
flags |= ESCAPE_HEX;
|
|
break;
|
|
case 'n':
|
|
flags |= ESCAPE_NULL;
|
|
break;
|
|
case 'o':
|
|
flags |= ESCAPE_OCTAL;
|
|
break;
|
|
case 'p':
|
|
flags |= ESCAPE_NP;
|
|
break;
|
|
case 's':
|
|
flags |= ESCAPE_SPACE;
|
|
break;
|
|
default:
|
|
found = false;
|
|
break;
|
|
}
|
|
} while (found);
|
|
|
|
if (!flags)
|
|
flags = ESCAPE_ANY_NP;
|
|
|
|
len = spec.field_width < 0 ? 1 : spec.field_width;
|
|
|
|
/*
|
|
* string_escape_mem() writes as many characters as it can to
|
|
* the given buffer, and returns the total size of the output
|
|
* had the buffer been big enough.
|
|
*/
|
|
buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static char *va_format(char *buf, char *end, struct va_format *va_fmt,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
va_list va;
|
|
|
|
if (check_pointer(&buf, end, va_fmt, spec))
|
|
return buf;
|
|
|
|
va_copy(va, *va_fmt->va);
|
|
buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
|
|
va_end(va);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *uuid_string(char *buf, char *end, const u8 *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char uuid[UUID_STRING_LEN + 1];
|
|
char *p = uuid;
|
|
int i;
|
|
const u8 *index = uuid_index;
|
|
bool uc = false;
|
|
|
|
if (check_pointer(&buf, end, addr, spec))
|
|
return buf;
|
|
|
|
switch (*(++fmt)) {
|
|
case 'L':
|
|
uc = true;
|
|
fallthrough;
|
|
case 'l':
|
|
index = guid_index;
|
|
break;
|
|
case 'B':
|
|
uc = true;
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
if (uc)
|
|
p = hex_byte_pack_upper(p, addr[index[i]]);
|
|
else
|
|
p = hex_byte_pack(p, addr[index[i]]);
|
|
switch (i) {
|
|
case 3:
|
|
case 5:
|
|
case 7:
|
|
case 9:
|
|
*p++ = '-';
|
|
break;
|
|
}
|
|
}
|
|
|
|
*p = 0;
|
|
|
|
return string_nocheck(buf, end, uuid, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *netdev_bits(char *buf, char *end, const void *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
unsigned long long num;
|
|
int size;
|
|
|
|
if (check_pointer(&buf, end, addr, spec))
|
|
return buf;
|
|
|
|
switch (fmt[1]) {
|
|
case 'F':
|
|
num = *(const netdev_features_t *)addr;
|
|
size = sizeof(netdev_features_t);
|
|
break;
|
|
default:
|
|
return error_string(buf, end, "(%pN?)", spec);
|
|
}
|
|
|
|
return special_hex_number(buf, end, num, size);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *fourcc_string(char *buf, char *end, const u32 *fourcc,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char output[sizeof("0123 little-endian (0x01234567)")];
|
|
char *p = output;
|
|
unsigned int i;
|
|
u32 orig, val;
|
|
|
|
if (fmt[1] != 'c' || fmt[2] != 'c')
|
|
return error_string(buf, end, "(%p4?)", spec);
|
|
|
|
if (check_pointer(&buf, end, fourcc, spec))
|
|
return buf;
|
|
|
|
orig = get_unaligned(fourcc);
|
|
val = orig & ~BIT(31);
|
|
|
|
for (i = 0; i < sizeof(u32); i++) {
|
|
unsigned char c = val >> (i * 8);
|
|
|
|
/* Print non-control ASCII characters as-is, dot otherwise */
|
|
*p++ = isascii(c) && isprint(c) ? c : '.';
|
|
}
|
|
|
|
*p++ = ' ';
|
|
strcpy(p, orig & BIT(31) ? "big-endian" : "little-endian");
|
|
p += strlen(p);
|
|
|
|
*p++ = ' ';
|
|
*p++ = '(';
|
|
p = special_hex_number(p, output + sizeof(output) - 2, orig, sizeof(u32));
|
|
*p++ = ')';
|
|
*p = '\0';
|
|
|
|
return string(buf, end, output, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *address_val(char *buf, char *end, const void *addr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
unsigned long long num;
|
|
int size;
|
|
|
|
if (check_pointer(&buf, end, addr, spec))
|
|
return buf;
|
|
|
|
switch (fmt[1]) {
|
|
case 'd':
|
|
num = *(const dma_addr_t *)addr;
|
|
size = sizeof(dma_addr_t);
|
|
break;
|
|
case 'p':
|
|
default:
|
|
num = *(const phys_addr_t *)addr;
|
|
size = sizeof(phys_addr_t);
|
|
break;
|
|
}
|
|
|
|
return special_hex_number(buf, end, num, size);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
|
|
{
|
|
int year = tm->tm_year + (r ? 0 : 1900);
|
|
int mon = tm->tm_mon + (r ? 0 : 1);
|
|
|
|
buf = number(buf, end, year, default_dec04_spec);
|
|
if (buf < end)
|
|
*buf = '-';
|
|
buf++;
|
|
|
|
buf = number(buf, end, mon, default_dec02_spec);
|
|
if (buf < end)
|
|
*buf = '-';
|
|
buf++;
|
|
|
|
return number(buf, end, tm->tm_mday, default_dec02_spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
|
|
{
|
|
buf = number(buf, end, tm->tm_hour, default_dec02_spec);
|
|
if (buf < end)
|
|
*buf = ':';
|
|
buf++;
|
|
|
|
buf = number(buf, end, tm->tm_min, default_dec02_spec);
|
|
if (buf < end)
|
|
*buf = ':';
|
|
buf++;
|
|
|
|
return number(buf, end, tm->tm_sec, default_dec02_spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
bool have_t = true, have_d = true;
|
|
bool raw = false, iso8601_separator = true;
|
|
bool found = true;
|
|
int count = 2;
|
|
|
|
if (check_pointer(&buf, end, tm, spec))
|
|
return buf;
|
|
|
|
switch (fmt[count]) {
|
|
case 'd':
|
|
have_t = false;
|
|
count++;
|
|
break;
|
|
case 't':
|
|
have_d = false;
|
|
count++;
|
|
break;
|
|
}
|
|
|
|
do {
|
|
switch (fmt[count++]) {
|
|
case 'r':
|
|
raw = true;
|
|
break;
|
|
case 's':
|
|
iso8601_separator = false;
|
|
break;
|
|
default:
|
|
found = false;
|
|
break;
|
|
}
|
|
} while (found);
|
|
|
|
if (have_d)
|
|
buf = date_str(buf, end, tm, raw);
|
|
if (have_d && have_t) {
|
|
if (buf < end)
|
|
*buf = iso8601_separator ? 'T' : ' ';
|
|
buf++;
|
|
}
|
|
if (have_t)
|
|
buf = time_str(buf, end, tm, raw);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *time64_str(char *buf, char *end, const time64_t time,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
struct rtc_time rtc_time;
|
|
struct tm tm;
|
|
|
|
time64_to_tm(time, 0, &tm);
|
|
|
|
rtc_time.tm_sec = tm.tm_sec;
|
|
rtc_time.tm_min = tm.tm_min;
|
|
rtc_time.tm_hour = tm.tm_hour;
|
|
rtc_time.tm_mday = tm.tm_mday;
|
|
rtc_time.tm_mon = tm.tm_mon;
|
|
rtc_time.tm_year = tm.tm_year;
|
|
rtc_time.tm_wday = tm.tm_wday;
|
|
rtc_time.tm_yday = tm.tm_yday;
|
|
|
|
rtc_time.tm_isdst = 0;
|
|
|
|
return rtc_str(buf, end, &rtc_time, spec, fmt);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
|
|
const char *fmt)
|
|
{
|
|
switch (fmt[1]) {
|
|
case 'R':
|
|
return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
|
|
case 'T':
|
|
return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt);
|
|
default:
|
|
return error_string(buf, end, "(%pt?)", spec);
|
|
}
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
|
|
const char *fmt)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_HAVE_CLK))
|
|
return error_string(buf, end, "(%pC?)", spec);
|
|
|
|
if (check_pointer(&buf, end, clk, spec))
|
|
return buf;
|
|
|
|
switch (fmt[1]) {
|
|
case 'n':
|
|
default:
|
|
#ifdef CONFIG_COMMON_CLK
|
|
return string(buf, end, __clk_get_name(clk), spec);
|
|
#else
|
|
return ptr_to_id(buf, end, clk, spec);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
static
|
|
char *format_flags(char *buf, char *end, unsigned long flags,
|
|
const struct trace_print_flags *names)
|
|
{
|
|
unsigned long mask;
|
|
|
|
for ( ; flags && names->name; names++) {
|
|
mask = names->mask;
|
|
if ((flags & mask) != mask)
|
|
continue;
|
|
|
|
buf = string(buf, end, names->name, default_str_spec);
|
|
|
|
flags &= ~mask;
|
|
if (flags) {
|
|
if (buf < end)
|
|
*buf = '|';
|
|
buf++;
|
|
}
|
|
}
|
|
|
|
if (flags)
|
|
buf = number(buf, end, flags, default_flag_spec);
|
|
|
|
return buf;
|
|
}
|
|
|
|
struct page_flags_fields {
|
|
int width;
|
|
int shift;
|
|
int mask;
|
|
const struct printf_spec *spec;
|
|
const char *name;
|
|
};
|
|
|
|
static const struct page_flags_fields pff[] = {
|
|
{SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
|
|
&default_dec_spec, "section"},
|
|
{NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
|
|
&default_dec_spec, "node"},
|
|
{ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
|
|
&default_dec_spec, "zone"},
|
|
{LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
|
|
&default_flag_spec, "lastcpupid"},
|
|
{KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
|
|
&default_flag_spec, "kasantag"},
|
|
};
|
|
|
|
static
|
|
char *format_page_flags(char *buf, char *end, unsigned long flags)
|
|
{
|
|
unsigned long main_flags = flags & PAGEFLAGS_MASK;
|
|
bool append = false;
|
|
int i;
|
|
|
|
buf = number(buf, end, flags, default_flag_spec);
|
|
if (buf < end)
|
|
*buf = '(';
|
|
buf++;
|
|
|
|
/* Page flags from the main area. */
|
|
if (main_flags) {
|
|
buf = format_flags(buf, end, main_flags, pageflag_names);
|
|
append = true;
|
|
}
|
|
|
|
/* Page flags from the fields area */
|
|
for (i = 0; i < ARRAY_SIZE(pff); i++) {
|
|
/* Skip undefined fields. */
|
|
if (!pff[i].width)
|
|
continue;
|
|
|
|
/* Format: Flag Name + '=' (equals sign) + Number + '|' (separator) */
|
|
if (append) {
|
|
if (buf < end)
|
|
*buf = '|';
|
|
buf++;
|
|
}
|
|
|
|
buf = string(buf, end, pff[i].name, default_str_spec);
|
|
if (buf < end)
|
|
*buf = '=';
|
|
buf++;
|
|
buf = number(buf, end, (flags >> pff[i].shift) & pff[i].mask,
|
|
*pff[i].spec);
|
|
|
|
append = true;
|
|
}
|
|
if (buf < end)
|
|
*buf = ')';
|
|
buf++;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static
|
|
char *format_page_type(char *buf, char *end, unsigned int page_type)
|
|
{
|
|
buf = number(buf, end, page_type, default_flag_spec);
|
|
|
|
if (buf < end)
|
|
*buf = '(';
|
|
buf++;
|
|
|
|
if (page_type_has_type(page_type))
|
|
buf = format_flags(buf, end, ~page_type, pagetype_names);
|
|
|
|
if (buf < end)
|
|
*buf = ')';
|
|
buf++;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *flags_string(char *buf, char *end, void *flags_ptr,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
unsigned long flags;
|
|
const struct trace_print_flags *names;
|
|
|
|
if (check_pointer(&buf, end, flags_ptr, spec))
|
|
return buf;
|
|
|
|
switch (fmt[1]) {
|
|
case 'p':
|
|
return format_page_flags(buf, end, *(unsigned long *)flags_ptr);
|
|
case 't':
|
|
return format_page_type(buf, end, *(unsigned int *)flags_ptr);
|
|
case 'v':
|
|
flags = *(unsigned long *)flags_ptr;
|
|
names = vmaflag_names;
|
|
break;
|
|
case 'g':
|
|
flags = (__force unsigned long)(*(gfp_t *)flags_ptr);
|
|
names = gfpflag_names;
|
|
break;
|
|
default:
|
|
return error_string(buf, end, "(%pG?)", spec);
|
|
}
|
|
|
|
return format_flags(buf, end, flags, names);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
|
|
char *end)
|
|
{
|
|
int depth;
|
|
|
|
/* Loop starting from the root node to the current node. */
|
|
for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
|
|
/*
|
|
* Only get a reference for other nodes (i.e. parent nodes).
|
|
* fwnode refcount may be 0 here.
|
|
*/
|
|
struct fwnode_handle *__fwnode = depth ?
|
|
fwnode_get_nth_parent(fwnode, depth) : fwnode;
|
|
|
|
buf = string(buf, end, fwnode_get_name_prefix(__fwnode),
|
|
default_str_spec);
|
|
buf = string(buf, end, fwnode_get_name(__fwnode),
|
|
default_str_spec);
|
|
|
|
if (depth)
|
|
fwnode_handle_put(__fwnode);
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *device_node_string(char *buf, char *end, struct device_node *dn,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
char tbuf[sizeof("xxxx") + 1];
|
|
const char *p;
|
|
int ret;
|
|
char *buf_start = buf;
|
|
struct property *prop;
|
|
bool has_mult, pass;
|
|
|
|
struct printf_spec str_spec = spec;
|
|
str_spec.field_width = -1;
|
|
|
|
if (fmt[0] != 'F')
|
|
return error_string(buf, end, "(%pO?)", spec);
|
|
|
|
if (!IS_ENABLED(CONFIG_OF))
|
|
return error_string(buf, end, "(%pOF?)", spec);
|
|
|
|
if (check_pointer(&buf, end, dn, spec))
|
|
return buf;
|
|
|
|
/* simple case without anything any more format specifiers */
|
|
fmt++;
|
|
if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
|
|
fmt = "f";
|
|
|
|
for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
|
|
int precision;
|
|
if (pass) {
|
|
if (buf < end)
|
|
*buf = ':';
|
|
buf++;
|
|
}
|
|
|
|
switch (*fmt) {
|
|
case 'f': /* full_name */
|
|
buf = fwnode_full_name_string(of_fwnode_handle(dn), buf,
|
|
end);
|
|
break;
|
|
case 'n': /* name */
|
|
p = fwnode_get_name(of_fwnode_handle(dn));
|
|
precision = str_spec.precision;
|
|
str_spec.precision = strchrnul(p, '@') - p;
|
|
buf = string(buf, end, p, str_spec);
|
|
str_spec.precision = precision;
|
|
break;
|
|
case 'p': /* phandle */
|
|
buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec);
|
|
break;
|
|
case 'P': /* path-spec */
|
|
p = fwnode_get_name(of_fwnode_handle(dn));
|
|
if (!p[1])
|
|
p = "/";
|
|
buf = string(buf, end, p, str_spec);
|
|
break;
|
|
case 'F': /* flags */
|
|
tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
|
|
tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
|
|
tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
|
|
tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
|
|
tbuf[4] = 0;
|
|
buf = string_nocheck(buf, end, tbuf, str_spec);
|
|
break;
|
|
case 'c': /* major compatible string */
|
|
ret = of_property_read_string(dn, "compatible", &p);
|
|
if (!ret)
|
|
buf = string(buf, end, p, str_spec);
|
|
break;
|
|
case 'C': /* full compatible string */
|
|
has_mult = false;
|
|
of_property_for_each_string(dn, "compatible", prop, p) {
|
|
if (has_mult)
|
|
buf = string_nocheck(buf, end, ",", str_spec);
|
|
buf = string_nocheck(buf, end, "\"", str_spec);
|
|
buf = string(buf, end, p, str_spec);
|
|
buf = string_nocheck(buf, end, "\"", str_spec);
|
|
|
|
has_mult = true;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return widen_string(buf, buf - buf_start, end, spec);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
|
|
struct printf_spec spec, const char *fmt)
|
|
{
|
|
struct printf_spec str_spec = spec;
|
|
char *buf_start = buf;
|
|
|
|
str_spec.field_width = -1;
|
|
|
|
if (*fmt != 'w')
|
|
return error_string(buf, end, "(%pf?)", spec);
|
|
|
|
if (check_pointer(&buf, end, fwnode, spec))
|
|
return buf;
|
|
|
|
fmt++;
|
|
|
|
switch (*fmt) {
|
|
case 'P': /* name */
|
|
buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
|
|
break;
|
|
case 'f': /* full_name */
|
|
default:
|
|
buf = fwnode_full_name_string(fwnode, buf, end);
|
|
break;
|
|
}
|
|
|
|
return widen_string(buf, buf - buf_start, end, spec);
|
|
}
|
|
|
|
int __init no_hash_pointers_enable(char *str)
|
|
{
|
|
if (no_hash_pointers)
|
|
return 0;
|
|
|
|
no_hash_pointers = true;
|
|
|
|
pr_warn("**********************************************************\n");
|
|
pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
|
|
pr_warn("** **\n");
|
|
pr_warn("** This system shows unhashed kernel memory addresses **\n");
|
|
pr_warn("** via the console, logs, and other interfaces. This **\n");
|
|
pr_warn("** might reduce the security of your system. **\n");
|
|
pr_warn("** **\n");
|
|
pr_warn("** If you see this message and you are not debugging **\n");
|
|
pr_warn("** the kernel, report this immediately to your system **\n");
|
|
pr_warn("** administrator! **\n");
|
|
pr_warn("** **\n");
|
|
pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
|
|
pr_warn("**********************************************************\n");
|
|
|
|
return 0;
|
|
}
|
|
early_param("no_hash_pointers", no_hash_pointers_enable);
|
|
|
|
/* Used for Rust formatting ('%pA'). */
|
|
char *rust_fmt_argument(char *buf, char *end, void *ptr);
|
|
|
|
/*
|
|
* Show a '%p' thing. A kernel extension is that the '%p' is followed
|
|
* by an extra set of alphanumeric characters that are extended format
|
|
* specifiers.
|
|
*
|
|
* Please update scripts/checkpatch.pl when adding/removing conversion
|
|
* characters. (Search for "check for vsprintf extension").
|
|
*
|
|
* Right now we handle:
|
|
*
|
|
* - 'S' For symbolic direct pointers (or function descriptors) with offset
|
|
* - 's' For symbolic direct pointers (or function descriptors) without offset
|
|
* - '[Ss]R' as above with __builtin_extract_return_addr() translation
|
|
* - 'S[R]b' as above with module build ID (for use in backtraces)
|
|
* - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
|
|
* %ps and %pS. Be careful when re-using these specifiers.
|
|
* - 'B' For backtraced symbolic direct pointers with offset
|
|
* - 'Bb' as above with module build ID (for use in backtraces)
|
|
* - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
|
|
* - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
|
|
* - 'b[l]' For a bitmap, the number of bits is determined by the field
|
|
* width which must be explicitly specified either as part of the
|
|
* format string '%32b[l]' or through '%*b[l]', [l] selects
|
|
* range-list format instead of hex format
|
|
* - 'M' For a 6-byte MAC address, it prints the address in the
|
|
* usual colon-separated hex notation
|
|
* - 'm' For a 6-byte MAC address, it prints the hex address without colons
|
|
* - 'MF' For a 6-byte MAC FDDI address, it prints the address
|
|
* with a dash-separated hex notation
|
|
* - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
|
|
* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
|
|
* IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
|
|
* IPv6 uses colon separated network-order 16 bit hex with leading 0's
|
|
* [S][pfs]
|
|
* Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
|
|
* [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
|
|
* - 'i' [46] for 'raw' IPv4/IPv6 addresses
|
|
* IPv6 omits the colons (01020304...0f)
|
|
* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
|
|
* [S][pfs]
|
|
* Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
|
|
* [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
|
|
* - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
|
|
* - 'I[6S]c' for IPv6 addresses printed as specified by
|
|
* https://tools.ietf.org/html/rfc5952
|
|
* - 'E[achnops]' For an escaped buffer, where rules are defined by combination
|
|
* of the following flags (see string_escape_mem() for the
|
|
* details):
|
|
* a - ESCAPE_ANY
|
|
* c - ESCAPE_SPECIAL
|
|
* h - ESCAPE_HEX
|
|
* n - ESCAPE_NULL
|
|
* o - ESCAPE_OCTAL
|
|
* p - ESCAPE_NP
|
|
* s - ESCAPE_SPACE
|
|
* By default ESCAPE_ANY_NP is used.
|
|
* - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
|
|
* "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
|
|
* Options for %pU are:
|
|
* b big endian lower case hex (default)
|
|
* B big endian UPPER case hex
|
|
* l little endian lower case hex
|
|
* L little endian UPPER case hex
|
|
* big endian output byte order is:
|
|
* [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
|
|
* little endian output byte order is:
|
|
* [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
|
|
* - 'V' For a struct va_format which contains a format string * and va_list *,
|
|
* call vsnprintf(->format, *->va_list).
|
|
* Implements a "recursive vsnprintf".
|
|
* Do not use this feature without some mechanism to verify the
|
|
* correctness of the format string and va_list arguments.
|
|
* - 'K' For a kernel pointer that should be hidden from unprivileged users.
|
|
* Use only for procfs, sysfs and similar files, not printk(); please
|
|
* read the documentation (path below) first.
|
|
* - 'NF' For a netdev_features_t
|
|
* - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
|
|
* - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
|
|
* a certain separator (' ' by default):
|
|
* C colon
|
|
* D dash
|
|
* N no separator
|
|
* The maximum supported length is 64 bytes of the input. Consider
|
|
* to use print_hex_dump() for the larger input.
|
|
* - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
|
|
* (default assumed to be phys_addr_t, passed by reference)
|
|
* - 'd[234]' For a dentry name (optionally 2-4 last components)
|
|
* - 'D[234]' Same as 'd' but for a struct file
|
|
* - 'g' For block_device name (gendisk + partition number)
|
|
* - 't[RT][dt][r][s]' For time and date as represented by:
|
|
* R struct rtc_time
|
|
* T time64_t
|
|
* - 'C' For a clock, it prints the name (Common Clock Framework) or address
|
|
* (legacy clock framework) of the clock
|
|
* - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
|
|
* (legacy clock framework) of the clock
|
|
* - 'G' For flags to be printed as a collection of symbolic strings that would
|
|
* construct the specific value. Supported flags given by option:
|
|
* p page flags (see struct page) given as pointer to unsigned long
|
|
* g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
|
|
* v vma flags (VM_*) given as pointer to unsigned long
|
|
* - 'OF[fnpPcCF]' For a device tree object
|
|
* Without any optional arguments prints the full_name
|
|
* f device node full_name
|
|
* n device node name
|
|
* p device node phandle
|
|
* P device node path spec (name + @unit)
|
|
* F device node flags
|
|
* c major compatible string
|
|
* C full compatible string
|
|
* - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer
|
|
* Without an option prints the full name of the node
|
|
* f full name
|
|
* P node name, including a possible unit address
|
|
* - 'x' For printing the address unmodified. Equivalent to "%lx".
|
|
* Please read the documentation (path below) before using!
|
|
* - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of
|
|
* bpf_trace_printk() where [ku] prefix specifies either kernel (k)
|
|
* or user (u) memory to probe, and:
|
|
* s a string, equivalent to "%s" on direct vsnprintf() use
|
|
*
|
|
* ** When making changes please also update:
|
|
* Documentation/core-api/printk-formats.rst
|
|
*
|
|
* Note: The default behaviour (unadorned %p) is to hash the address,
|
|
* rendering it useful as a unique identifier.
|
|
*
|
|
* There is also a '%pA' format specifier, but it is only intended to be used
|
|
* from Rust code to format core::fmt::Arguments. Do *not* use it from C.
|
|
* See rust/kernel/print.rs for details.
|
|
*/
|
|
static noinline_for_stack
|
|
char *pointer(const char *fmt, char *buf, char *end, void *ptr,
|
|
struct printf_spec spec)
|
|
{
|
|
switch (*fmt) {
|
|
case 'S':
|
|
case 's':
|
|
ptr = dereference_symbol_descriptor(ptr);
|
|
fallthrough;
|
|
case 'B':
|
|
return symbol_string(buf, end, ptr, spec, fmt);
|
|
case 'R':
|
|
case 'r':
|
|
return resource_string(buf, end, ptr, spec, fmt);
|
|
case 'h':
|
|
return hex_string(buf, end, ptr, spec, fmt);
|
|
case 'b':
|
|
switch (fmt[1]) {
|
|
case 'l':
|
|
return bitmap_list_string(buf, end, ptr, spec, fmt);
|
|
default:
|
|
return bitmap_string(buf, end, ptr, spec, fmt);
|
|
}
|
|
case 'M': /* Colon separated: 00:01:02:03:04:05 */
|
|
case 'm': /* Contiguous: 000102030405 */
|
|
/* [mM]F (FDDI) */
|
|
/* [mM]R (Reverse order; Bluetooth) */
|
|
return mac_address_string(buf, end, ptr, spec, fmt);
|
|
case 'I': /* Formatted IP supported
|
|
* 4: 1.2.3.4
|
|
* 6: 0001:0203:...:0708
|
|
* 6c: 1::708 or 1::1.2.3.4
|
|
*/
|
|
case 'i': /* Contiguous:
|
|
* 4: 001.002.003.004
|
|
* 6: 000102...0f
|
|
*/
|
|
return ip_addr_string(buf, end, ptr, spec, fmt);
|
|
case 'E':
|
|
return escaped_string(buf, end, ptr, spec, fmt);
|
|
case 'U':
|
|
return uuid_string(buf, end, ptr, spec, fmt);
|
|
case 'V':
|
|
return va_format(buf, end, ptr, spec, fmt);
|
|
case 'K':
|
|
return restricted_pointer(buf, end, ptr, spec);
|
|
case 'N':
|
|
return netdev_bits(buf, end, ptr, spec, fmt);
|
|
case '4':
|
|
return fourcc_string(buf, end, ptr, spec, fmt);
|
|
case 'a':
|
|
return address_val(buf, end, ptr, spec, fmt);
|
|
case 'd':
|
|
return dentry_name(buf, end, ptr, spec, fmt);
|
|
case 't':
|
|
return time_and_date(buf, end, ptr, spec, fmt);
|
|
case 'C':
|
|
return clock(buf, end, ptr, spec, fmt);
|
|
case 'D':
|
|
return file_dentry_name(buf, end, ptr, spec, fmt);
|
|
#ifdef CONFIG_BLOCK
|
|
case 'g':
|
|
return bdev_name(buf, end, ptr, spec, fmt);
|
|
#endif
|
|
|
|
case 'G':
|
|
return flags_string(buf, end, ptr, spec, fmt);
|
|
case 'O':
|
|
return device_node_string(buf, end, ptr, spec, fmt + 1);
|
|
case 'f':
|
|
return fwnode_string(buf, end, ptr, spec, fmt + 1);
|
|
case 'A':
|
|
if (!IS_ENABLED(CONFIG_RUST)) {
|
|
WARN_ONCE(1, "Please remove %%pA from non-Rust code\n");
|
|
return error_string(buf, end, "(%pA?)", spec);
|
|
}
|
|
return rust_fmt_argument(buf, end, ptr);
|
|
case 'x':
|
|
return pointer_string(buf, end, ptr, spec);
|
|
case 'e':
|
|
/* %pe with a non-ERR_PTR gets treated as plain %p */
|
|
if (!IS_ERR(ptr))
|
|
return default_pointer(buf, end, ptr, spec);
|
|
return err_ptr(buf, end, ptr, spec);
|
|
case 'u':
|
|
case 'k':
|
|
switch (fmt[1]) {
|
|
case 's':
|
|
return string(buf, end, ptr, spec);
|
|
default:
|
|
return error_string(buf, end, "(einval)", spec);
|
|
}
|
|
default:
|
|
return default_pointer(buf, end, ptr, spec);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Helper function to decode printf style format.
|
|
* Each call decode a token from the format and return the
|
|
* number of characters read (or likely the delta where it wants
|
|
* to go on the next call).
|
|
* The decoded token is returned through the parameters
|
|
*
|
|
* 'h', 'l', or 'L' for integer fields
|
|
* 'z' support added 23/7/1999 S.H.
|
|
* 'z' changed to 'Z' --davidm 1/25/99
|
|
* 'Z' changed to 'z' --adobriyan 2017-01-25
|
|
* 't' added for ptrdiff_t
|
|
*
|
|
* @fmt: the format string
|
|
* @type of the token returned
|
|
* @flags: various flags such as +, -, # tokens..
|
|
* @field_width: overwritten width
|
|
* @base: base of the number (octal, hex, ...)
|
|
* @precision: precision of a number
|
|
* @qualifier: qualifier of a number (long, size_t, ...)
|
|
*/
|
|
static noinline_for_stack
|
|
int format_decode(const char *fmt, struct printf_spec *spec)
|
|
{
|
|
const char *start = fmt;
|
|
char qualifier;
|
|
|
|
/* we finished early by reading the field width */
|
|
if (spec->type == FORMAT_TYPE_WIDTH) {
|
|
if (spec->field_width < 0) {
|
|
spec->field_width = -spec->field_width;
|
|
spec->flags |= LEFT;
|
|
}
|
|
spec->type = FORMAT_TYPE_NONE;
|
|
goto precision;
|
|
}
|
|
|
|
/* we finished early by reading the precision */
|
|
if (spec->type == FORMAT_TYPE_PRECISION) {
|
|
if (spec->precision < 0)
|
|
spec->precision = 0;
|
|
|
|
spec->type = FORMAT_TYPE_NONE;
|
|
goto qualifier;
|
|
}
|
|
|
|
/* By default */
|
|
spec->type = FORMAT_TYPE_NONE;
|
|
|
|
for (; *fmt ; ++fmt) {
|
|
if (*fmt == '%')
|
|
break;
|
|
}
|
|
|
|
/* Return the current non-format string */
|
|
if (fmt != start || !*fmt)
|
|
return fmt - start;
|
|
|
|
/* Process flags */
|
|
spec->flags = 0;
|
|
|
|
while (1) { /* this also skips first '%' */
|
|
bool found = true;
|
|
|
|
++fmt;
|
|
|
|
switch (*fmt) {
|
|
case '-': spec->flags |= LEFT; break;
|
|
case '+': spec->flags |= PLUS; break;
|
|
case ' ': spec->flags |= SPACE; break;
|
|
case '#': spec->flags |= SPECIAL; break;
|
|
case '0': spec->flags |= ZEROPAD; break;
|
|
default: found = false;
|
|
}
|
|
|
|
if (!found)
|
|
break;
|
|
}
|
|
|
|
/* get field width */
|
|
spec->field_width = -1;
|
|
|
|
if (isdigit(*fmt))
|
|
spec->field_width = skip_atoi(&fmt);
|
|
else if (*fmt == '*') {
|
|
/* it's the next argument */
|
|
spec->type = FORMAT_TYPE_WIDTH;
|
|
return ++fmt - start;
|
|
}
|
|
|
|
precision:
|
|
/* get the precision */
|
|
spec->precision = -1;
|
|
if (*fmt == '.') {
|
|
++fmt;
|
|
if (isdigit(*fmt)) {
|
|
spec->precision = skip_atoi(&fmt);
|
|
if (spec->precision < 0)
|
|
spec->precision = 0;
|
|
} else if (*fmt == '*') {
|
|
/* it's the next argument */
|
|
spec->type = FORMAT_TYPE_PRECISION;
|
|
return ++fmt - start;
|
|
}
|
|
}
|
|
|
|
qualifier:
|
|
/* get the conversion qualifier */
|
|
qualifier = 0;
|
|
if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
|
*fmt == 'z' || *fmt == 't') {
|
|
qualifier = *fmt++;
|
|
if (unlikely(qualifier == *fmt)) {
|
|
if (qualifier == 'l') {
|
|
qualifier = 'L';
|
|
++fmt;
|
|
} else if (qualifier == 'h') {
|
|
qualifier = 'H';
|
|
++fmt;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* default base */
|
|
spec->base = 10;
|
|
switch (*fmt) {
|
|
case 'c':
|
|
spec->type = FORMAT_TYPE_CHAR;
|
|
return ++fmt - start;
|
|
|
|
case 's':
|
|
spec->type = FORMAT_TYPE_STR;
|
|
return ++fmt - start;
|
|
|
|
case 'p':
|
|
spec->type = FORMAT_TYPE_PTR;
|
|
return ++fmt - start;
|
|
|
|
case '%':
|
|
spec->type = FORMAT_TYPE_PERCENT_CHAR;
|
|
return ++fmt - start;
|
|
|
|
/* integer number formats - set up the flags and "break" */
|
|
case 'o':
|
|
spec->base = 8;
|
|
break;
|
|
|
|
case 'x':
|
|
spec->flags |= SMALL;
|
|
fallthrough;
|
|
|
|
case 'X':
|
|
spec->base = 16;
|
|
break;
|
|
|
|
case 'd':
|
|
case 'i':
|
|
spec->flags |= SIGN;
|
|
break;
|
|
case 'u':
|
|
break;
|
|
|
|
case 'n':
|
|
/*
|
|
* Since %n poses a greater security risk than
|
|
* utility, treat it as any other invalid or
|
|
* unsupported format specifier.
|
|
*/
|
|
fallthrough;
|
|
|
|
default:
|
|
WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
|
|
spec->type = FORMAT_TYPE_INVALID;
|
|
return fmt - start;
|
|
}
|
|
|
|
if (qualifier == 'L')
|
|
spec->type = FORMAT_TYPE_LONG_LONG;
|
|
else if (qualifier == 'l') {
|
|
BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
|
|
spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
|
|
} else if (qualifier == 'z') {
|
|
spec->type = FORMAT_TYPE_SIZE_T;
|
|
} else if (qualifier == 't') {
|
|
spec->type = FORMAT_TYPE_PTRDIFF;
|
|
} else if (qualifier == 'H') {
|
|
BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
|
|
spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
|
|
} else if (qualifier == 'h') {
|
|
BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
|
|
spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
|
|
} else {
|
|
BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
|
|
spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
|
|
}
|
|
|
|
return ++fmt - start;
|
|
}
|
|
|
|
static void
|
|
set_field_width(struct printf_spec *spec, int width)
|
|
{
|
|
spec->field_width = width;
|
|
if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
|
|
spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_precision(struct printf_spec *spec, int prec)
|
|
{
|
|
spec->precision = prec;
|
|
if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
|
|
spec->precision = clamp(prec, 0, PRECISION_MAX);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* vsnprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* This function generally follows C99 vsnprintf, but has some
|
|
* extensions and a few limitations:
|
|
*
|
|
* - ``%n`` is unsupported
|
|
* - ``%p*`` is handled by pointer()
|
|
*
|
|
* See pointer() or Documentation/core-api/printk-formats.rst for more
|
|
* extensive description.
|
|
*
|
|
* **Please update the documentation in both places when making changes**
|
|
*
|
|
* The return value is the number of characters which would
|
|
* be generated for the given input, excluding the trailing
|
|
* '\0', as per ISO C99. If you want to have the exact
|
|
* number of characters written into @buf as return value
|
|
* (not including the trailing '\0'), use vscnprintf(). If the
|
|
* return is greater than or equal to @size, the resulting
|
|
* string is truncated.
|
|
*
|
|
* If you're not already dealing with a va_list consider using snprintf().
|
|
*/
|
|
int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
|
{
|
|
unsigned long long num;
|
|
char *str, *end;
|
|
struct printf_spec spec = {0};
|
|
|
|
/* Reject out-of-range values early. Large positive sizes are
|
|
used for unknown buffer sizes. */
|
|
if (WARN_ON_ONCE(size > INT_MAX))
|
|
return 0;
|
|
|
|
str = buf;
|
|
end = buf + size;
|
|
|
|
/* Make sure end is always >= buf */
|
|
if (end < buf) {
|
|
end = ((void *)-1);
|
|
size = end - buf;
|
|
}
|
|
|
|
while (*fmt) {
|
|
const char *old_fmt = fmt;
|
|
int read = format_decode(fmt, &spec);
|
|
|
|
fmt += read;
|
|
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_NONE: {
|
|
int copy = read;
|
|
if (str < end) {
|
|
if (copy > end - str)
|
|
copy = end - str;
|
|
memcpy(str, old_fmt, copy);
|
|
}
|
|
str += read;
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_WIDTH:
|
|
set_field_width(&spec, va_arg(args, int));
|
|
break;
|
|
|
|
case FORMAT_TYPE_PRECISION:
|
|
set_precision(&spec, va_arg(args, int));
|
|
break;
|
|
|
|
case FORMAT_TYPE_CHAR: {
|
|
char c;
|
|
|
|
if (!(spec.flags & LEFT)) {
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
|
|
}
|
|
}
|
|
c = (unsigned char) va_arg(args, int);
|
|
if (str < end)
|
|
*str = c;
|
|
++str;
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_STR:
|
|
str = string(str, end, va_arg(args, char *), spec);
|
|
break;
|
|
|
|
case FORMAT_TYPE_PTR:
|
|
str = pointer(fmt, str, end, va_arg(args, void *),
|
|
spec);
|
|
while (isalnum(*fmt))
|
|
fmt++;
|
|
break;
|
|
|
|
case FORMAT_TYPE_PERCENT_CHAR:
|
|
if (str < end)
|
|
*str = '%';
|
|
++str;
|
|
break;
|
|
|
|
case FORMAT_TYPE_INVALID:
|
|
/*
|
|
* Presumably the arguments passed gcc's type
|
|
* checking, but there is no safe or sane way
|
|
* for us to continue parsing the format and
|
|
* fetching from the va_list; the remaining
|
|
* specifiers and arguments would be out of
|
|
* sync.
|
|
*/
|
|
goto out;
|
|
|
|
default:
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_LONG_LONG:
|
|
num = va_arg(args, long long);
|
|
break;
|
|
case FORMAT_TYPE_ULONG:
|
|
num = va_arg(args, unsigned long);
|
|
break;
|
|
case FORMAT_TYPE_LONG:
|
|
num = va_arg(args, long);
|
|
break;
|
|
case FORMAT_TYPE_SIZE_T:
|
|
if (spec.flags & SIGN)
|
|
num = va_arg(args, ssize_t);
|
|
else
|
|
num = va_arg(args, size_t);
|
|
break;
|
|
case FORMAT_TYPE_PTRDIFF:
|
|
num = va_arg(args, ptrdiff_t);
|
|
break;
|
|
case FORMAT_TYPE_UBYTE:
|
|
num = (unsigned char) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_BYTE:
|
|
num = (signed char) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_USHORT:
|
|
num = (unsigned short) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_SHORT:
|
|
num = (short) va_arg(args, int);
|
|
break;
|
|
case FORMAT_TYPE_INT:
|
|
num = (int) va_arg(args, int);
|
|
break;
|
|
default:
|
|
num = va_arg(args, unsigned int);
|
|
}
|
|
|
|
str = number(str, end, num, spec);
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (size > 0) {
|
|
if (str < end)
|
|
*str = '\0';
|
|
else
|
|
end[-1] = '\0';
|
|
}
|
|
|
|
/* the trailing null byte doesn't count towards the total */
|
|
return str-buf;
|
|
|
|
}
|
|
EXPORT_SYMBOL(vsnprintf);
|
|
|
|
/**
|
|
* vscnprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* The return value is the number of characters which have been written into
|
|
* the @buf not including the trailing '\0'. If @size is == 0 the function
|
|
* returns 0.
|
|
*
|
|
* If you're not already dealing with a va_list consider using scnprintf().
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
|
|
{
|
|
int i;
|
|
|
|
if (unlikely(!size))
|
|
return 0;
|
|
|
|
i = vsnprintf(buf, size, fmt, args);
|
|
|
|
if (likely(i < size))
|
|
return i;
|
|
|
|
return size - 1;
|
|
}
|
|
EXPORT_SYMBOL(vscnprintf);
|
|
|
|
/**
|
|
* snprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The return value is the number of characters which would be
|
|
* generated for the given input, excluding the trailing null,
|
|
* as per ISO C99. If the return is greater than or equal to
|
|
* @size, the resulting string is truncated.
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int snprintf(char *buf, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vsnprintf(buf, size, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(snprintf);
|
|
|
|
/**
|
|
* scnprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The return value is the number of characters written into @buf not including
|
|
* the trailing '\0'. If @size is == 0 the function returns 0.
|
|
*/
|
|
|
|
int scnprintf(char *buf, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vscnprintf(buf, size, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(scnprintf);
|
|
|
|
/**
|
|
* vsprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* The function returns the number of characters written
|
|
* into @buf. Use vsnprintf() or vscnprintf() in order to avoid
|
|
* buffer overflows.
|
|
*
|
|
* If you're not already dealing with a va_list consider using sprintf().
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int vsprintf(char *buf, const char *fmt, va_list args)
|
|
{
|
|
return vsnprintf(buf, INT_MAX, fmt, args);
|
|
}
|
|
EXPORT_SYMBOL(vsprintf);
|
|
|
|
/**
|
|
* sprintf - Format a string and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The function returns the number of characters written
|
|
* into @buf. Use snprintf() or scnprintf() in order to avoid
|
|
* buffer overflows.
|
|
*
|
|
* See the vsnprintf() documentation for format string extensions over C99.
|
|
*/
|
|
int sprintf(char *buf, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vsnprintf(buf, INT_MAX, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(sprintf);
|
|
|
|
#ifdef CONFIG_BINARY_PRINTF
|
|
/*
|
|
* bprintf service:
|
|
* vbin_printf() - VA arguments to binary data
|
|
* bstr_printf() - Binary data to text string
|
|
*/
|
|
|
|
/**
|
|
* vbin_printf - Parse a format string and place args' binary value in a buffer
|
|
* @bin_buf: The buffer to place args' binary value
|
|
* @size: The size of the buffer(by words(32bits), not characters)
|
|
* @fmt: The format string to use
|
|
* @args: Arguments for the format string
|
|
*
|
|
* The format follows C99 vsnprintf, except %n is ignored, and its argument
|
|
* is skipped.
|
|
*
|
|
* The return value is the number of words(32bits) which would be generated for
|
|
* the given input.
|
|
*
|
|
* NOTE:
|
|
* If the return value is greater than @size, the resulting bin_buf is NOT
|
|
* valid for bstr_printf().
|
|
*/
|
|
int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
|
|
{
|
|
struct printf_spec spec = {0};
|
|
char *str, *end;
|
|
int width;
|
|
|
|
str = (char *)bin_buf;
|
|
end = (char *)(bin_buf + size);
|
|
|
|
#define save_arg(type) \
|
|
({ \
|
|
unsigned long long value; \
|
|
if (sizeof(type) == 8) { \
|
|
unsigned long long val8; \
|
|
str = PTR_ALIGN(str, sizeof(u32)); \
|
|
val8 = va_arg(args, unsigned long long); \
|
|
if (str + sizeof(type) <= end) { \
|
|
*(u32 *)str = *(u32 *)&val8; \
|
|
*(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
|
|
} \
|
|
value = val8; \
|
|
} else { \
|
|
unsigned int val4; \
|
|
str = PTR_ALIGN(str, sizeof(type)); \
|
|
val4 = va_arg(args, int); \
|
|
if (str + sizeof(type) <= end) \
|
|
*(typeof(type) *)str = (type)(long)val4; \
|
|
value = (unsigned long long)val4; \
|
|
} \
|
|
str += sizeof(type); \
|
|
value; \
|
|
})
|
|
|
|
while (*fmt) {
|
|
int read = format_decode(fmt, &spec);
|
|
|
|
fmt += read;
|
|
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_NONE:
|
|
case FORMAT_TYPE_PERCENT_CHAR:
|
|
break;
|
|
case FORMAT_TYPE_INVALID:
|
|
goto out;
|
|
|
|
case FORMAT_TYPE_WIDTH:
|
|
case FORMAT_TYPE_PRECISION:
|
|
width = (int)save_arg(int);
|
|
/* Pointers may require the width */
|
|
if (*fmt == 'p')
|
|
set_field_width(&spec, width);
|
|
break;
|
|
|
|
case FORMAT_TYPE_CHAR:
|
|
save_arg(char);
|
|
break;
|
|
|
|
case FORMAT_TYPE_STR: {
|
|
const char *save_str = va_arg(args, char *);
|
|
const char *err_msg;
|
|
size_t len;
|
|
|
|
err_msg = check_pointer_msg(save_str);
|
|
if (err_msg)
|
|
save_str = err_msg;
|
|
|
|
len = strlen(save_str) + 1;
|
|
if (str + len < end)
|
|
memcpy(str, save_str, len);
|
|
str += len;
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_PTR:
|
|
/* Dereferenced pointers must be done now */
|
|
switch (*fmt) {
|
|
/* Dereference of functions is still OK */
|
|
case 'S':
|
|
case 's':
|
|
case 'x':
|
|
case 'K':
|
|
case 'e':
|
|
save_arg(void *);
|
|
break;
|
|
default:
|
|
if (!isalnum(*fmt)) {
|
|
save_arg(void *);
|
|
break;
|
|
}
|
|
str = pointer(fmt, str, end, va_arg(args, void *),
|
|
spec);
|
|
if (str + 1 < end)
|
|
*str++ = '\0';
|
|
else
|
|
end[-1] = '\0'; /* Must be nul terminated */
|
|
}
|
|
/* skip all alphanumeric pointer suffixes */
|
|
while (isalnum(*fmt))
|
|
fmt++;
|
|
break;
|
|
|
|
default:
|
|
switch (spec.type) {
|
|
|
|
case FORMAT_TYPE_LONG_LONG:
|
|
save_arg(long long);
|
|
break;
|
|
case FORMAT_TYPE_ULONG:
|
|
case FORMAT_TYPE_LONG:
|
|
save_arg(unsigned long);
|
|
break;
|
|
case FORMAT_TYPE_SIZE_T:
|
|
save_arg(size_t);
|
|
break;
|
|
case FORMAT_TYPE_PTRDIFF:
|
|
save_arg(ptrdiff_t);
|
|
break;
|
|
case FORMAT_TYPE_UBYTE:
|
|
case FORMAT_TYPE_BYTE:
|
|
save_arg(char);
|
|
break;
|
|
case FORMAT_TYPE_USHORT:
|
|
case FORMAT_TYPE_SHORT:
|
|
save_arg(short);
|
|
break;
|
|
default:
|
|
save_arg(int);
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
|
|
#undef save_arg
|
|
}
|
|
EXPORT_SYMBOL_GPL(vbin_printf);
|
|
|
|
/**
|
|
* bstr_printf - Format a string from binary arguments and place it in a buffer
|
|
* @buf: The buffer to place the result into
|
|
* @size: The size of the buffer, including the trailing null space
|
|
* @fmt: The format string to use
|
|
* @bin_buf: Binary arguments for the format string
|
|
*
|
|
* This function like C99 vsnprintf, but the difference is that vsnprintf gets
|
|
* arguments from stack, and bstr_printf gets arguments from @bin_buf which is
|
|
* a binary buffer that generated by vbin_printf.
|
|
*
|
|
* The format follows C99 vsnprintf, but has some extensions:
|
|
* see vsnprintf comment for details.
|
|
*
|
|
* The return value is the number of characters which would
|
|
* be generated for the given input, excluding the trailing
|
|
* '\0', as per ISO C99. If you want to have the exact
|
|
* number of characters written into @buf as return value
|
|
* (not including the trailing '\0'), use vscnprintf(). If the
|
|
* return is greater than or equal to @size, the resulting
|
|
* string is truncated.
|
|
*/
|
|
int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
|
|
{
|
|
struct printf_spec spec = {0};
|
|
char *str, *end;
|
|
const char *args = (const char *)bin_buf;
|
|
|
|
if (WARN_ON_ONCE(size > INT_MAX))
|
|
return 0;
|
|
|
|
str = buf;
|
|
end = buf + size;
|
|
|
|
#define get_arg(type) \
|
|
({ \
|
|
typeof(type) value; \
|
|
if (sizeof(type) == 8) { \
|
|
args = PTR_ALIGN(args, sizeof(u32)); \
|
|
*(u32 *)&value = *(u32 *)args; \
|
|
*((u32 *)&value + 1) = *(u32 *)(args + 4); \
|
|
} else { \
|
|
args = PTR_ALIGN(args, sizeof(type)); \
|
|
value = *(typeof(type) *)args; \
|
|
} \
|
|
args += sizeof(type); \
|
|
value; \
|
|
})
|
|
|
|
/* Make sure end is always >= buf */
|
|
if (end < buf) {
|
|
end = ((void *)-1);
|
|
size = end - buf;
|
|
}
|
|
|
|
while (*fmt) {
|
|
const char *old_fmt = fmt;
|
|
int read = format_decode(fmt, &spec);
|
|
|
|
fmt += read;
|
|
|
|
switch (spec.type) {
|
|
case FORMAT_TYPE_NONE: {
|
|
int copy = read;
|
|
if (str < end) {
|
|
if (copy > end - str)
|
|
copy = end - str;
|
|
memcpy(str, old_fmt, copy);
|
|
}
|
|
str += read;
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_WIDTH:
|
|
set_field_width(&spec, get_arg(int));
|
|
break;
|
|
|
|
case FORMAT_TYPE_PRECISION:
|
|
set_precision(&spec, get_arg(int));
|
|
break;
|
|
|
|
case FORMAT_TYPE_CHAR: {
|
|
char c;
|
|
|
|
if (!(spec.flags & LEFT)) {
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
}
|
|
c = (unsigned char) get_arg(char);
|
|
if (str < end)
|
|
*str = c;
|
|
++str;
|
|
while (--spec.field_width > 0) {
|
|
if (str < end)
|
|
*str = ' ';
|
|
++str;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_STR: {
|
|
const char *str_arg = args;
|
|
args += strlen(str_arg) + 1;
|
|
str = string(str, end, (char *)str_arg, spec);
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_PTR: {
|
|
bool process = false;
|
|
int copy, len;
|
|
/* Non function dereferences were already done */
|
|
switch (*fmt) {
|
|
case 'S':
|
|
case 's':
|
|
case 'x':
|
|
case 'K':
|
|
case 'e':
|
|
process = true;
|
|
break;
|
|
default:
|
|
if (!isalnum(*fmt)) {
|
|
process = true;
|
|
break;
|
|
}
|
|
/* Pointer dereference was already processed */
|
|
if (str < end) {
|
|
len = copy = strlen(args);
|
|
if (copy > end - str)
|
|
copy = end - str;
|
|
memcpy(str, args, copy);
|
|
str += len;
|
|
args += len + 1;
|
|
}
|
|
}
|
|
if (process)
|
|
str = pointer(fmt, str, end, get_arg(void *), spec);
|
|
|
|
while (isalnum(*fmt))
|
|
fmt++;
|
|
break;
|
|
}
|
|
|
|
case FORMAT_TYPE_PERCENT_CHAR:
|
|
if (str < end)
|
|
*str = '%';
|
|
++str;
|
|
break;
|
|
|
|
case FORMAT_TYPE_INVALID:
|
|
goto out;
|
|
|
|
default: {
|
|
unsigned long long num;
|
|
|
|
switch (spec.type) {
|
|
|
|
case FORMAT_TYPE_LONG_LONG:
|
|
num = get_arg(long long);
|
|
break;
|
|
case FORMAT_TYPE_ULONG:
|
|
case FORMAT_TYPE_LONG:
|
|
num = get_arg(unsigned long);
|
|
break;
|
|
case FORMAT_TYPE_SIZE_T:
|
|
num = get_arg(size_t);
|
|
break;
|
|
case FORMAT_TYPE_PTRDIFF:
|
|
num = get_arg(ptrdiff_t);
|
|
break;
|
|
case FORMAT_TYPE_UBYTE:
|
|
num = get_arg(unsigned char);
|
|
break;
|
|
case FORMAT_TYPE_BYTE:
|
|
num = get_arg(signed char);
|
|
break;
|
|
case FORMAT_TYPE_USHORT:
|
|
num = get_arg(unsigned short);
|
|
break;
|
|
case FORMAT_TYPE_SHORT:
|
|
num = get_arg(short);
|
|
break;
|
|
case FORMAT_TYPE_UINT:
|
|
num = get_arg(unsigned int);
|
|
break;
|
|
default:
|
|
num = get_arg(int);
|
|
}
|
|
|
|
str = number(str, end, num, spec);
|
|
} /* default: */
|
|
} /* switch(spec.type) */
|
|
} /* while(*fmt) */
|
|
|
|
out:
|
|
if (size > 0) {
|
|
if (str < end)
|
|
*str = '\0';
|
|
else
|
|
end[-1] = '\0';
|
|
}
|
|
|
|
#undef get_arg
|
|
|
|
/* the trailing null byte doesn't count towards the total */
|
|
return str - buf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bstr_printf);
|
|
|
|
/**
|
|
* bprintf - Parse a format string and place args' binary value in a buffer
|
|
* @bin_buf: The buffer to place args' binary value
|
|
* @size: The size of the buffer(by words(32bits), not characters)
|
|
* @fmt: The format string to use
|
|
* @...: Arguments for the format string
|
|
*
|
|
* The function returns the number of words(u32) written
|
|
* into @bin_buf.
|
|
*/
|
|
int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int ret;
|
|
|
|
va_start(args, fmt);
|
|
ret = vbin_printf(bin_buf, size, fmt, args);
|
|
va_end(args);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bprintf);
|
|
|
|
#endif /* CONFIG_BINARY_PRINTF */
|
|
|
|
/**
|
|
* vsscanf - Unformat a buffer into a list of arguments
|
|
* @buf: input buffer
|
|
* @fmt: format of buffer
|
|
* @args: arguments
|
|
*/
|
|
int vsscanf(const char *buf, const char *fmt, va_list args)
|
|
{
|
|
const char *str = buf;
|
|
char *next;
|
|
char digit;
|
|
int num = 0;
|
|
u8 qualifier;
|
|
unsigned int base;
|
|
union {
|
|
long long s;
|
|
unsigned long long u;
|
|
} val;
|
|
s16 field_width;
|
|
bool is_sign;
|
|
|
|
while (*fmt) {
|
|
/* skip any white space in format */
|
|
/* white space in format matches any amount of
|
|
* white space, including none, in the input.
|
|
*/
|
|
if (isspace(*fmt)) {
|
|
fmt = skip_spaces(++fmt);
|
|
str = skip_spaces(str);
|
|
}
|
|
|
|
/* anything that is not a conversion must match exactly */
|
|
if (*fmt != '%' && *fmt) {
|
|
if (*fmt++ != *str++)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
if (!*fmt)
|
|
break;
|
|
++fmt;
|
|
|
|
/* skip this conversion.
|
|
* advance both strings to next white space
|
|
*/
|
|
if (*fmt == '*') {
|
|
if (!*str)
|
|
break;
|
|
while (!isspace(*fmt) && *fmt != '%' && *fmt) {
|
|
/* '%*[' not yet supported, invalid format */
|
|
if (*fmt == '[')
|
|
return num;
|
|
fmt++;
|
|
}
|
|
while (!isspace(*str) && *str)
|
|
str++;
|
|
continue;
|
|
}
|
|
|
|
/* get field width */
|
|
field_width = -1;
|
|
if (isdigit(*fmt)) {
|
|
field_width = skip_atoi(&fmt);
|
|
if (field_width <= 0)
|
|
break;
|
|
}
|
|
|
|
/* get conversion qualifier */
|
|
qualifier = -1;
|
|
if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
|
|
*fmt == 'z') {
|
|
qualifier = *fmt++;
|
|
if (unlikely(qualifier == *fmt)) {
|
|
if (qualifier == 'h') {
|
|
qualifier = 'H';
|
|
fmt++;
|
|
} else if (qualifier == 'l') {
|
|
qualifier = 'L';
|
|
fmt++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!*fmt)
|
|
break;
|
|
|
|
if (*fmt == 'n') {
|
|
/* return number of characters read so far */
|
|
*va_arg(args, int *) = str - buf;
|
|
++fmt;
|
|
continue;
|
|
}
|
|
|
|
if (!*str)
|
|
break;
|
|
|
|
base = 10;
|
|
is_sign = false;
|
|
|
|
switch (*fmt++) {
|
|
case 'c':
|
|
{
|
|
char *s = (char *)va_arg(args, char*);
|
|
if (field_width == -1)
|
|
field_width = 1;
|
|
do {
|
|
*s++ = *str++;
|
|
} while (--field_width > 0 && *str);
|
|
num++;
|
|
}
|
|
continue;
|
|
case 's':
|
|
{
|
|
char *s = (char *)va_arg(args, char *);
|
|
if (field_width == -1)
|
|
field_width = SHRT_MAX;
|
|
/* first, skip leading white space in buffer */
|
|
str = skip_spaces(str);
|
|
|
|
/* now copy until next white space */
|
|
while (*str && !isspace(*str) && field_width--)
|
|
*s++ = *str++;
|
|
*s = '\0';
|
|
num++;
|
|
}
|
|
continue;
|
|
/*
|
|
* Warning: This implementation of the '[' conversion specifier
|
|
* deviates from its glibc counterpart in the following ways:
|
|
* (1) It does NOT support ranges i.e. '-' is NOT a special
|
|
* character
|
|
* (2) It cannot match the closing bracket ']' itself
|
|
* (3) A field width is required
|
|
* (4) '%*[' (discard matching input) is currently not supported
|
|
*
|
|
* Example usage:
|
|
* ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
|
|
* buf1, buf2, buf3);
|
|
* if (ret < 3)
|
|
* // etc..
|
|
*/
|
|
case '[':
|
|
{
|
|
char *s = (char *)va_arg(args, char *);
|
|
DECLARE_BITMAP(set, 256) = {0};
|
|
unsigned int len = 0;
|
|
bool negate = (*fmt == '^');
|
|
|
|
/* field width is required */
|
|
if (field_width == -1)
|
|
return num;
|
|
|
|
if (negate)
|
|
++fmt;
|
|
|
|
for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
|
|
__set_bit((u8)*fmt, set);
|
|
|
|
/* no ']' or no character set found */
|
|
if (!*fmt || !len)
|
|
return num;
|
|
++fmt;
|
|
|
|
if (negate) {
|
|
bitmap_complement(set, set, 256);
|
|
/* exclude null '\0' byte */
|
|
__clear_bit(0, set);
|
|
}
|
|
|
|
/* match must be non-empty */
|
|
if (!test_bit((u8)*str, set))
|
|
return num;
|
|
|
|
while (test_bit((u8)*str, set) && field_width--)
|
|
*s++ = *str++;
|
|
*s = '\0';
|
|
++num;
|
|
}
|
|
continue;
|
|
case 'o':
|
|
base = 8;
|
|
break;
|
|
case 'x':
|
|
case 'X':
|
|
base = 16;
|
|
break;
|
|
case 'i':
|
|
base = 0;
|
|
fallthrough;
|
|
case 'd':
|
|
is_sign = true;
|
|
fallthrough;
|
|
case 'u':
|
|
break;
|
|
case '%':
|
|
/* looking for '%' in str */
|
|
if (*str++ != '%')
|
|
return num;
|
|
continue;
|
|
default:
|
|
/* invalid format; stop here */
|
|
return num;
|
|
}
|
|
|
|
/* have some sort of integer conversion.
|
|
* first, skip white space in buffer.
|
|
*/
|
|
str = skip_spaces(str);
|
|
|
|
digit = *str;
|
|
if (is_sign && digit == '-') {
|
|
if (field_width == 1)
|
|
break;
|
|
|
|
digit = *(str + 1);
|
|
}
|
|
|
|
if (!digit
|
|
|| (base == 16 && !isxdigit(digit))
|
|
|| (base == 10 && !isdigit(digit))
|
|
|| (base == 8 && !isodigit(digit))
|
|
|| (base == 0 && !isdigit(digit)))
|
|
break;
|
|
|
|
if (is_sign)
|
|
val.s = simple_strntoll(str, &next, base,
|
|
field_width >= 0 ? field_width : INT_MAX);
|
|
else
|
|
val.u = simple_strntoull(str, &next, base,
|
|
field_width >= 0 ? field_width : INT_MAX);
|
|
|
|
switch (qualifier) {
|
|
case 'H': /* that's 'hh' in format */
|
|
if (is_sign)
|
|
*va_arg(args, signed char *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned char *) = val.u;
|
|
break;
|
|
case 'h':
|
|
if (is_sign)
|
|
*va_arg(args, short *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned short *) = val.u;
|
|
break;
|
|
case 'l':
|
|
if (is_sign)
|
|
*va_arg(args, long *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned long *) = val.u;
|
|
break;
|
|
case 'L':
|
|
if (is_sign)
|
|
*va_arg(args, long long *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned long long *) = val.u;
|
|
break;
|
|
case 'z':
|
|
*va_arg(args, size_t *) = val.u;
|
|
break;
|
|
default:
|
|
if (is_sign)
|
|
*va_arg(args, int *) = val.s;
|
|
else
|
|
*va_arg(args, unsigned int *) = val.u;
|
|
break;
|
|
}
|
|
num++;
|
|
|
|
if (!next)
|
|
break;
|
|
str = next;
|
|
}
|
|
|
|
return num;
|
|
}
|
|
EXPORT_SYMBOL(vsscanf);
|
|
|
|
/**
|
|
* sscanf - Unformat a buffer into a list of arguments
|
|
* @buf: input buffer
|
|
* @fmt: formatting of buffer
|
|
* @...: resulting arguments
|
|
*/
|
|
int sscanf(const char *buf, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i;
|
|
|
|
va_start(args, fmt);
|
|
i = vsscanf(buf, fmt, args);
|
|
va_end(args);
|
|
|
|
return i;
|
|
}
|
|
EXPORT_SYMBOL(sscanf);
|