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kprobes, x86: Prohibit probing on thunk functions and restore

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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@hitachi.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20140417081726.26341.3872.stgit@ltc230.yrl.intra.hitachi.co.jp
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Masami Hiramatsu 2014-04-17 17:17:26 +09:00 committed by Ingo Molnar
parent 8027197220
commit 98def1dedd
2 changed files with 5 additions and 1 deletions
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3
arch/x86/lib/thunk_32.S
View file

@ -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

3
arch/x86/lib/thunk_64.S
View file

@ -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)