Probes fixes for v7.3-rc5:

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- fprobe: Use guard(rcu_sched_notrace) and check rcu_is_watching():
    Exit handlers early if !rcu_is_watching() to prevent potential
    use-after-free during unregistration in idle/quiescent states. Switch
    to guard(rcu_sched_notrace) to avoid fast-path lockdep overhead and
    recursion while ensuring safe grace period synchronization.
 
 - kprobes: Skip disarmed probes when checking optkprobe overlap:
    Continue past disarmed or unprepared probes in get_optimized_kprobe()
    to find active optimized probes. This avoids overwriting active jump
    displacements which can lead to panic.
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Merge tag 'probes-fixes-v7.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull probes fixes from Masami Hiramatsu:

 - fprobe: Use guard(rcu_sched_notrace) and check rcu_is_watching()

   Exit handlers early if !rcu_is_watching() to prevent potential
   use-after-free during unregistration in idle/quiescent states. Switch
   to guard(rcu_sched_notrace) to avoid fast-path lockdep overhead and
   recursion while ensuring safe grace period synchronization.

 - kprobes: Skip disarmed probes when checking optkprobe overlap

   Continue past disarmed or unprepared probes in get_optimized_kprobe()
   to find active optimized probes. This avoids overwriting active jump
   displacements which can lead to panic.

* tag 'probes-fixes-v7.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  kprobes: Skip disarmed probes when checking optkprobe overlap
  fprobe: Use guard(rcu_sched_notrace) and check rcu_is_watching()

...

This commit is contained in:

Linus Torvalds 2026-10-02 17:34:18 -07:00

parent ff47652a4b 7a39c732a2

commit e767a4ea70

2 changed files with 21 additions and 13 deletions

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8

kernel/kprobes.c

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26

kernel/trace/fprobe.c

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