Messages in this thread Patch in this message | | | Date | Tue, 25 Feb 2020 23:08:04 +0100 | From | Thomas Gleixner <> | Subject | [patch 3/8] x86/entry/common: Mark syscall entry points notrace/nokprobe |
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Anything before enter_from_user_mode() is not safe to be traced or probed.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/entry/common.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -314,11 +314,12 @@ void do_syscall_64_irqs_on(unsigned long syscall_return_slowpath(regs); } -__visible void do_syscall_64(unsigned long nr, struct pt_regs *regs) +__visible notrace void do_syscall_64(unsigned long nr, struct pt_regs *regs) { syscall_entry_fixups(); do_syscall_64_irqs_on(nr, regs); } +NOKPROBE_SYMBOL(do_syscall_64); #endif #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) @@ -369,11 +370,12 @@ static __always_inline void do_syscall_3 } /* Handles int $0x80 */ -__visible void do_int80_syscall_32(struct pt_regs *regs) +__visible notrace void do_int80_syscall_32(struct pt_regs *regs) { syscall_entry_fixups(); do_syscall_32_irqs_on(regs); } +NOKPROBE_SYMBOL(do_int80_syscall_32); /* Fast syscall 32bit variant */ static __always_inline long do_fast_syscall_32_irqs_on(struct pt_regs *regs) @@ -449,10 +451,11 @@ static __always_inline long do_fast_sysc } /* Returns 0 to return using IRET or 1 to return using SYSEXIT/SYSRETL. */ -__visible long do_fast_syscall_32(struct pt_regs *regs) +__visible notrace long do_fast_syscall_32(struct pt_regs *regs) { syscall_entry_fixups(); return do_fast_syscall_32_irqs_on(regs); } +NOKPROBE_SYMBOL(do_fast_syscall_32); #endif /* CONFIG_X86_32 || CONFIG_IA32_EMULATION */
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