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authorLinus Torvalds <torvalds@linux-foundation.org>2010-04-20 09:20:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-04-20 09:20:23 -0700
commit34388d1c4feae50d61d6f4ec7594b9076d6d24db (patch)
tree3c586aaae3d88c2cd0ce4d78300377935d7ea9cb
parent186837ca3a6dd6b422a5ea316ed38eea183dca5d (diff)
parentab285f2b5290d92b7ec1a6f9aad54308dadf6157 (diff)
downloadlinux-34388d1c4feae50d61d6f4ec7594b9076d6d24db.tar.bz2
Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: perf: Fix unsafe frame rewinding with hot regs fetching
-rw-r--r--arch/x86/kernel/dumpstack.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kernel/dumpstack.h b/arch/x86/kernel/dumpstack.h
index e39e77168a37..e1a93be4fd44 100644
--- a/arch/x86/kernel/dumpstack.h
+++ b/arch/x86/kernel/dumpstack.h
@@ -14,6 +14,8 @@
#define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
#endif
+#include <linux/uaccess.h>
+
extern void
show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp, char *log_lvl);
@@ -42,8 +44,10 @@ static inline unsigned long rewind_frame_pointer(int n)
get_bp(frame);
#ifdef CONFIG_FRAME_POINTER
- while (n--)
- frame = frame->next_frame;
+ while (n--) {
+ if (probe_kernel_address(&frame->next_frame, frame))
+ break;
+ }
#endif
return (unsigned long)frame;