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| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2014-04-17 12:17:26 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-04-24 12:02:58 +0400 |
| commit | 98def1dedd00f42ded8423c418c971751f46aad2 (patch) | |
| tree | 33852494b1b3f98dcf26e30a9cc8a4cb8949ac44 /arch/x86/lib/thunk_64.S | |
| parent | 8027197220e02d5cebbbfdff36c2827661fbc692 (diff) | |
| download | linux-98def1dedd00f42ded8423c418c971751f46aad2.tar.xz | |
kprobes, x86: Prohibit probing on thunk functions and restore
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>
Diffstat (limited to 'arch/x86/lib/thunk_64.S')
| -rw-r--r-- | arch/x86/lib/thunk_64.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/lib/thunk_64.S b/arch/x86/lib/thunk_64.S index a63efd6bb6a5..92d9feaff42b 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) |