linux-kernel - [patch 3/8] x86/entry/common: Mark syscall entry points notrace/nokprobe

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Date:   Tue, 25 Feb 2020 23:08:04 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [patch 3/8] x86/entry/common: Mark syscall entry points notrace/nokprobe

Anything before enter_from_user_mode() is not safe to be traced or probed.

Signed-off-by: Thomas Gleixner <tglx@...utronix.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 */