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-rw-r--r--kernel/ptrace.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index b760bae64cf1..aa94aee9d4c9 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -364,8 +364,14 @@ unlock_creds:
mutex_unlock(&task->signal->cred_guard_mutex);
out:
if (!retval) {
- wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT,
- TASK_UNINTERRUPTIBLE);
+ /*
+ * We do not bother to change retval or clear JOBCTL_TRAPPING
+ * if wait_on_bit() was interrupted by SIGKILL. The tracer will
+ * not return to user-mode, it will exit and clear this bit in
+ * __ptrace_unlink() if it wasn't already cleared by the tracee;
+ * and until then nobody can ptrace this task.
+ */
+ wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, TASK_KILLABLE);
proc_ptrace_connector(task, PTRACE_ATTACH);
}