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

Pull perf fixes from Ingo Molnar:
 "Two kernel side fixes: a kprobes fix and a perf_remove_from_context()
  fix (which does not yet fix the migration bug which is WIP)"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix a race condition in perf_remove_from_context()
  kprobes/x86: Free 'optinsn' cache when range check fails
This commit is contained in:
Linus Torvalds 2014-09-19 10:31:36 -07:00
parent 7a5e87867e 3577af70a2
commit 598a0c7d09
2 changed files with 13 additions and 1 deletions
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4
arch/x86/kernel/kprobes/opt.c
View File

@ -338,8 +338,10 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op)
* a relative jump.
*/
rel = (long)op->optinsn.insn - (long)op->kp.addr + RELATIVEJUMP_SIZE;
if (abs(rel) > 0x7fffffff)
if (abs(rel) > 0x7fffffff) {
__arch_remove_optimized_kprobe(op, 0);
return -ERANGE;
}
buf = (u8 *)op->optinsn.insn;

10
kernel/events/core.c
View File

@ -1524,6 +1524,11 @@ static void perf_remove_from_context(struct perf_event *event, bool detach_group
*/
if (ctx->is_active) {
raw_spin_unlock_irq(&ctx->lock);
/*
* Reload the task pointer, it might have been changed by
* a concurrent perf_event_context_sched_out().
*/
task = ctx->task;
goto retry;
}
@ -1967,6 +1972,11 @@ perf_install_in_context(struct perf_event_context *ctx,
*/
if (ctx->is_active) {
raw_spin_unlock_irq(&ctx->lock);
/*
* Reload the task pointer, it might have been changed by
* a concurrent perf_event_context_sched_out().
*/
task = ctx->task;
goto retry;
}