Fix for syscall_get_nr() to make it work even if tracing is disabled
-----BEGIN PGP SIGNATURE----- iQJOBAABCAA4FiEEbt46xwy6kEcDOXoUeZbBVTGwZHAFAmYY7QoaHHRzYm9nZW5k QGFscGhhLmZyYW5rZW4uZGUACgkQeZbBVTGwZHDuJxAAhS4A48oPpC98MvxzzIUz xJIOoJbQZuFK7rEd2CEusbt4Ri3tojsIQ1IqLKEGHq6OJxuWS8U9egn8wQZVcO3s BsJrtfiu4jEhUohWNDzVG7XiMc+/H1vRN7/BXV3Fvl8bSvwouqWcYfMU/0qe7Ntq X34aidIvVLUCDZPz/LMUXGoaxW2oA2yAEuH+LaLfW/sZ+FWzM9f1e6BgxzV5HnqV qeRiZq56C1y2UMUbbgoLdHlP0T2PgiZ4eZ3wzlw9goka47hXUQlvPvg6x7pCv+ZS 9mOZWMqTiMczhQlm3jjeKBo45eVKLnf6QfV3Sr4TwRYoxoO95hTEsgf6JTgprxiP +M5BG5XJchXUE2m3Oi9cnIo9wXcIyj+QlYhxqGPR5zIHcAOOKGUn3E4yuhezbN8X tvdF8kUv7He9drRA5rUdZ0AJ1P+nooaBfEPoIPhb7laSxlyXi4SGLKziY9CRdiMq jxJezT2ES75cz66XMHJMSCZTHEF4rthVA6UsTa3gGer2BEKWAMFZ2zoMTv1ZO9Mo tcxsSonL2vfW99lcFt8PWAucoVi0EjB0sxDASccg0NS/sT6hBb9qrWuG3Bq9u2N7 DzWPO1275yMuPwYxWpjxQ5bDMBnT/TzPxSv06obFayCip6NJABHAYpZ/gzK8CaaD bGmMowZIPpsdoUzrIdFN3DA= =fJiH -----END PGP SIGNATURE----- Merge tag 'mips-fixes_6.9_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux Pull MIPS fix from Thomas Bogendoerfer: "Fix for syscall_get_nr() to make it work even if tracing is disabled" * tag 'mips-fixes_6.9_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: MIPS: scall: Save thread_info.syscall unconditionally on entry
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e00011a146
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@ -159,7 +159,7 @@ extern unsigned long exception_ip(struct pt_regs *regs);
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#define exception_ip(regs) exception_ip(regs)
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#define profile_pc(regs) instruction_pointer(regs)
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extern asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall);
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extern asmlinkage long syscall_trace_enter(struct pt_regs *regs);
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extern asmlinkage void syscall_trace_leave(struct pt_regs *regs);
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extern void die(const char *, struct pt_regs *) __noreturn;
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@ -101,6 +101,7 @@ void output_thread_info_defines(void)
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OFFSET(TI_CPU, thread_info, cpu);
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OFFSET(TI_PRE_COUNT, thread_info, preempt_count);
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OFFSET(TI_REGS, thread_info, regs);
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OFFSET(TI_SYSCALL, thread_info, syscall);
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DEFINE(_THREAD_SIZE, THREAD_SIZE);
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DEFINE(_THREAD_MASK, THREAD_MASK);
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DEFINE(_IRQ_STACK_SIZE, IRQ_STACK_SIZE);
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@ -1317,16 +1317,13 @@ long arch_ptrace(struct task_struct *child, long request,
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* Notification of system call entry/exit
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* - triggered by current->work.syscall_trace
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*/
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asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
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asmlinkage long syscall_trace_enter(struct pt_regs *regs)
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{
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user_exit();
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current_thread_info()->syscall = syscall;
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if (test_thread_flag(TIF_SYSCALL_TRACE)) {
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if (ptrace_report_syscall_entry(regs))
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return -1;
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syscall = current_thread_info()->syscall;
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}
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#ifdef CONFIG_SECCOMP
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@ -1335,7 +1332,7 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
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struct seccomp_data sd;
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unsigned long args[6];
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sd.nr = syscall;
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sd.nr = current_thread_info()->syscall;
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sd.arch = syscall_get_arch(current);
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syscall_get_arguments(current, regs, args);
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for (i = 0; i < 6; i++)
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@ -1345,23 +1342,23 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
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ret = __secure_computing(&sd);
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if (ret == -1)
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return ret;
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syscall = current_thread_info()->syscall;
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}
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#endif
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if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
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trace_sys_enter(regs, regs->regs[2]);
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audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
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audit_syscall_entry(current_thread_info()->syscall,
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regs->regs[4], regs->regs[5],
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regs->regs[6], regs->regs[7]);
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/*
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* Negative syscall numbers are mistaken for rejected syscalls, but
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* won't have had the return value set appropriately, so we do so now.
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*/
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if (syscall < 0)
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if (current_thread_info()->syscall < 0)
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syscall_set_return_value(current, regs, -ENOSYS, 0);
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return syscall;
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return current_thread_info()->syscall;
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}
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/*
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@ -77,6 +77,18 @@ loads_done:
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PTR_WD load_a7, bad_stack_a7
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.previous
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/*
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* syscall number is in v0 unless we called syscall(__NR_###)
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* where the real syscall number is in a0
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*/
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subu t2, v0, __NR_O32_Linux
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bnez t2, 1f /* __NR_syscall at offset 0 */
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LONG_S a0, TI_SYSCALL($28) # Save a0 as syscall number
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b 2f
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1:
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LONG_S v0, TI_SYSCALL($28) # Save v0 as syscall number
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2:
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lw t0, TI_FLAGS($28) # syscall tracing enabled?
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li t1, _TIF_WORK_SYSCALL_ENTRY
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and t0, t1
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@ -114,16 +126,7 @@ syscall_trace_entry:
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SAVE_STATIC
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move a0, sp
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/*
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* syscall number is in v0 unless we called syscall(__NR_###)
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* where the real syscall number is in a0
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*/
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move a1, v0
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subu t2, v0, __NR_O32_Linux
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bnez t2, 1f /* __NR_syscall at offset 0 */
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lw a1, PT_R4(sp)
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1: jal syscall_trace_enter
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jal syscall_trace_enter
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bltz v0, 1f # seccomp failed? Skip syscall
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@ -44,6 +44,8 @@ NESTED(handle_sysn32, PT_SIZE, sp)
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sd a3, PT_R26(sp) # save a3 for syscall restarting
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LONG_S v0, TI_SYSCALL($28) # Store syscall number
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li t1, _TIF_WORK_SYSCALL_ENTRY
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LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
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and t0, t1, t0
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@ -72,7 +74,6 @@ syscall_common:
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n32_syscall_trace_entry:
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SAVE_STATIC
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move a0, sp
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move a1, v0
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jal syscall_trace_enter
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bltz v0, 1f # seccomp failed? Skip syscall
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@ -46,6 +46,8 @@ NESTED(handle_sys64, PT_SIZE, sp)
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sd a3, PT_R26(sp) # save a3 for syscall restarting
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LONG_S v0, TI_SYSCALL($28) # Store syscall number
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li t1, _TIF_WORK_SYSCALL_ENTRY
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LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
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and t0, t1, t0
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@ -82,7 +84,6 @@ n64_syscall_exit:
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syscall_trace_entry:
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SAVE_STATIC
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move a0, sp
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move a1, v0
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jal syscall_trace_enter
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bltz v0, 1f # seccomp failed? Skip syscall
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@ -79,6 +79,22 @@ loads_done:
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PTR_WD load_a7, bad_stack_a7
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.previous
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/*
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* absolute syscall number is in v0 unless we called syscall(__NR_###)
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* where the real syscall number is in a0
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* note: NR_syscall is the first O32 syscall but the macro is
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* only defined when compiling with -mabi=32 (CONFIG_32BIT)
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* therefore __NR_O32_Linux is used (4000)
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*/
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subu t2, v0, __NR_O32_Linux
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bnez t2, 1f /* __NR_syscall at offset 0 */
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LONG_S a0, TI_SYSCALL($28) # Save a0 as syscall number
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b 2f
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1:
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LONG_S v0, TI_SYSCALL($28) # Save v0 as syscall number
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2:
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li t1, _TIF_WORK_SYSCALL_ENTRY
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LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
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and t0, t1, t0
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@ -113,22 +129,7 @@ trace_a_syscall:
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sd a7, PT_R11(sp) # For indirect syscalls
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move a0, sp
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/*
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* absolute syscall number is in v0 unless we called syscall(__NR_###)
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* where the real syscall number is in a0
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* note: NR_syscall is the first O32 syscall but the macro is
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* only defined when compiling with -mabi=32 (CONFIG_32BIT)
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* therefore __NR_O32_Linux is used (4000)
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*/
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.set push
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.set reorder
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subu t1, v0, __NR_O32_Linux
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move a1, v0
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bnez t1, 1f /* __NR_syscall at offset 0 */
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ld a1, PT_R4(sp) /* Arg1 for __NR_syscall case */
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.set pop
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1: jal syscall_trace_enter
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jal syscall_trace_enter
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bltz v0, 1f # seccomp failed? Skip syscall
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