diff options
| author | Sean Paul <seanpaul@chromium.org> | 2017-05-04 08:38:21 -0400 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2017-05-04 08:42:49 -0400 |
| commit | 3c390df3337e54130e4b511ea3bbb868643cc5ea (patch) | |
| tree | 3963984db2528843edcf2a2bb9f281fd150ab784 /kernel/ptrace.c | |
| parent | cd4b11d9d524ef457433d42c121e3405765d4a29 (diff) | |
| parent | 8b03d1ed2c43a2ba5ef3381322ee4515b97381bf (diff) | |
Merge tag 'drm-for-v4.12' of git://people.freedesktop.org/~airlied/linux into drm-misc-nextdrm-misc-next-2017-05-05
Backmerging Dave's 'drm-for-v4.12' pull request now that it's landed. There are
a bunch of non-drm changes which are just random bits we hadn't yet picked up in
misc-next.
main drm pull request for 4.12 kernel
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/CAPM=9ty0jHgzG18zOr5CYODyTqZfH55kOCOFqNnXiWnTb_uNWw@mail.gmail.com
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 0af928712174..266ddcc1d8bb 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -184,11 +184,17 @@ static void ptrace_unfreeze_traced(struct task_struct *task) WARN_ON(!task->ptrace || task->parent != current); + /* + * PTRACE_LISTEN can allow ptrace_trap_notify to wake us up remotely. + * Recheck state under the lock to close this race. + */ spin_lock_irq(&task->sighand->siglock); - if (__fatal_signal_pending(task)) - wake_up_state(task, __TASK_TRACED); - else - task->state = TASK_TRACED; + if (task->state == __TASK_TRACED) { + if (__fatal_signal_pending(task)) + wake_up_state(task, __TASK_TRACED); + else + task->state = TASK_TRACED; + } spin_unlock_irq(&task->sighand->siglock); } |