forked from Minki/linux
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
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commit
34388d1c4f
@ -14,6 +14,8 @@
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#define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
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#endif
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#include <linux/uaccess.h>
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extern void
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show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
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unsigned long *stack, unsigned long bp, char *log_lvl);
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@ -42,8 +44,10 @@ static inline unsigned long rewind_frame_pointer(int n)
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get_bp(frame);
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#ifdef CONFIG_FRAME_POINTER
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while (n--)
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frame = frame->next_frame;
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while (n--) {
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if (probe_kernel_address(&frame->next_frame, frame))
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break;
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}
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#endif
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return (unsigned long)frame;
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