[PATCH -tip v9 07/26] [BUGFIX] x86: Prohibit probing on thunk functions and restore

[Masami Hiramatsu]

thunk/restore functions are also used for tracing irqoff etc.
and those are involved in kprobe's exception handling.
Prohibit probing on them to avoid kernel crash.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Reviewed-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
---
 arch/x86/lib/thunk_32.S |    3 ++-
 arch/x86/lib/thunk_64.S |    3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/lib/thunk_32.S b/arch/x86/lib/thunk_32.S
index 2930ae0..28f85c91 100644
--- a/arch/x86/lib/thunk_32.S
+++ b/arch/x86/lib/thunk_32.S
@@ -4,8 +4,8 @@
  *  (inspired by Andi Kleen's thunk_64.S)
  * Subject to the GNU public license, v.2. No warranty of any kind.
  */
-
 	#include <linux/linkage.h>
+	#include <asm/asm.h>
 
 #ifdef CONFIG_TRACE_IRQFLAGS
 	/* put return address in eax (arg1) */
@@ -22,6 +22,7 @@
 	popl %ecx
 	popl %eax
 	ret
+	_ASM_NOKPROBE(\name)
 	.endm
 
 	thunk_ra trace_hardirqs_on_thunk,trace_hardirqs_on_caller
diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S
index a63efd6..92d9fea 100644
--- a/arch/x86/lib/thunk_64.S
+++ b/arch/x86/lib/thunk_64.S
@@ -8,6 +8,7 @@
 #include <linux/linkage.h>
 #include <asm/dwarf2.h>
 #include <asm/calling.h>
+#include <asm/asm.h>
 
 	/* rdi:	arg1 ... normal C conventions. rax is saved/restored. */
 	.macro THUNK name, func, put_ret_addr_in_rdi=0
@@ -25,6 +26,7 @@
 	call \func
 	jmp  restore
 	CFI_ENDPROC
+	_ASM_NOKPROBE(\name)
 	.endm
 
 #ifdef CONFIG_TRACE_IRQFLAGS
@@ -43,3 +45,4 @@ restore:
 	RESTORE_ARGS
 	ret
 	CFI_ENDPROC
+	_ASM_NOKPROBE(restore)


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