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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 kprobe fix from Thomas Gleixner:
 "A single fix clearing the TF bit when a fault is single stepped"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  kprobes/x86: Clear TF bit in fault on single-stepping
This commit is contained in:
Linus Torvalds 2016-06-25 06:49:32 -07:00
parent 57801c1b81 dcfc47248d
commit 9a949a9859
1 changed files with 12 additions and 0 deletions
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12
arch/x86/kernel/kprobes/core.c
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@ -961,7 +961,19 @@ int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
* normal page fault.
*/
regs->ip = (unsigned long)cur->addr;
/*
* Trap flag (TF) has been set here because this fault
* happened where the single stepping will be done.
* So clear it by resetting the current kprobe:
*/
regs->flags &= ~X86_EFLAGS_TF;
/*
* If the TF flag was set before the kprobe hit,
* don't touch it:
*/
regs->flags |= kcb->kprobe_old_flags;
if (kcb->kprobe_status == KPROBE_REENTER)
restore_previous_kprobe(kcb);
else