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- Fix a #GP in the perf user callchain code caused by a race between uprobe

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freeing the task and the bpf profiler unwinding the task's user stack
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Merge tag 'perf_urgent_for_v6.13_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fix from Borislav Petkov:

 - Fix a #GP in the perf user callchain code caused by a race between
   uprobe freeing the task and the bpf profiler unwinding the task's
   user stack

* tag 'perf_urgent_for_v6.13_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  uprobes: Fix race in uprobe_free_utask
This commit is contained in:
Linus Torvalds 2025-01-12 11:57:45 -08:00
commit a603abe345
1 changed files with 1 additions and 1 deletions
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2
kernel/events/uprobes.c
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@ -1915,6 +1915,7 @@ void uprobe_free_utask(struct task_struct *t)
if (!utask) if (!utask)
return; return;
t->utask = NULL;
WARN_ON_ONCE(utask->active_uprobe || utask->xol_vaddr); WARN_ON_ONCE(utask->active_uprobe || utask->xol_vaddr);
timer_delete_sync(&utask->ri_timer); timer_delete_sync(&utask->ri_timer);
@ -1924,7 +1925,6 @@ void uprobe_free_utask(struct task_struct *t)
ri = free_ret_instance(ri, true /* cleanup_hprobe */); ri = free_ret_instance(ri, true /* cleanup_hprobe */);
kfree(utask); kfree(utask);
t->utask = NULL;
} }
#define RI_TIMER_PERIOD (HZ / 10) /* 100 ms */ #define RI_TIMER_PERIOD (HZ / 10) /* 100 ms */