9281acea6a
KSYM_NAME_LEN is peculiar in that it does not include the space for the trailing '\0', forcing all users to use KSYM_NAME_LEN + 1 when allocating buffer. This is nonsense and error-prone. Moreover, when the caller forgets that it's very likely to subtly bite back by corrupting the stack because the last position of the buffer is always cleared to zero. This patch increments KSYM_NAME_LEN by one and updates code accordingly. * off-by-one bug in asm-powerpc/kprobes.h::kprobe_lookup_name() macro is fixed. * Where MODULE_NAME_LEN and KSYM_NAME_LEN were used together, MODULE_NAME_LEN was treated as if it didn't include space for the trailing '\0'. Fix it. Signed-off-by: Tejun Heo <htejun@gmail.com> Acked-by: Paulo Marques <pmarques@grupopie.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/* Rewritten and vastly simplified by Rusty Russell for in-kernel
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* module loader:
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* Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
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*/
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#ifndef _LINUX_KALLSYMS_H
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#define _LINUX_KALLSYMS_H
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#include <linux/errno.h>
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#define KSYM_NAME_LEN 128
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#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
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2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
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#ifdef CONFIG_KALLSYMS
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/* Lookup the address for a symbol. Returns 0 if not found. */
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unsigned long kallsyms_lookup_name(const char *name);
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extern int kallsyms_lookup_size_offset(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset);
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/* Lookup an address. modname is set to NULL if it's in the kernel. */
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const char *kallsyms_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname, char *namebuf);
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/* Look up a kernel symbol and return it in a text buffer. */
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extern int sprint_symbol(char *buffer, unsigned long address);
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/* Look up a kernel symbol and print it to the kernel messages. */
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extern void __print_symbol(const char *fmt, unsigned long address);
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int lookup_symbol_name(unsigned long addr, char *symname);
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int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
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#else /* !CONFIG_KALLSYMS */
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static inline unsigned long kallsyms_lookup_name(const char *name)
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{
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return 0;
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}
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static inline int kallsyms_lookup_size_offset(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset)
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{
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return 0;
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}
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static inline const char *kallsyms_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname, char *namebuf)
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{
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return NULL;
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}
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static inline int sprint_symbol(char *buffer, unsigned long addr)
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{
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*buffer = '\0';
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return 0;
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}
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static inline int lookup_symbol_name(unsigned long addr, char *symname)
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{
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return -ERANGE;
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}
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static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
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{
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return -ERANGE;
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}
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/* Stupid that this does nothing, but I didn't create this mess. */
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#define __print_symbol(fmt, addr)
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#endif /*CONFIG_KALLSYMS*/
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/* This macro allows us to keep printk typechecking */
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static void __check_printsym_format(const char *fmt, ...)
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__attribute__((format(printf,1,2)));
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static inline void __check_printsym_format(const char *fmt, ...)
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{
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}
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/* ia64 and ppc64 use function descriptors, which contain the real address */
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#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
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#define print_fn_descriptor_symbol(fmt, addr) \
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do { \
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unsigned long *__faddr = (unsigned long*) addr; \
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print_symbol(fmt, __faddr[0]); \
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} while (0)
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#else
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#define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
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#endif
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static inline void print_symbol(const char *fmt, unsigned long addr)
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{
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__check_printsym_format(fmt, "");
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__print_symbol(fmt, (unsigned long)
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__builtin_extract_return_addr((void *)addr));
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}
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#ifndef CONFIG_64BIT
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#define print_ip_sym(ip) \
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do { \
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printk("[<%08lx>]", ip); \
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print_symbol(" %s\n", ip); \
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} while(0)
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#else
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#define print_ip_sym(ip) \
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do { \
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printk("[<%016lx>]", ip); \
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print_symbol(" %s\n", ip); \
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} while(0)
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#endif
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#endif /*_LINUX_KALLSYMS_H*/
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