Call send_sig_info in PTRACE_KILL instead of ptrace_resume. Calling ptrace_resume is not safe to call if the task has not been stopped with ptrace_freeze_traced.
Cc: stable@vger.kernel.org Reported-by: Al Viro viro@zeniv.linux.org.uk Suggested-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: "Eric W. Biederman" ebiederm@xmission.com --- kernel/ptrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index ccc4b465775b..43da5764b6f3 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -1238,7 +1238,7 @@ int ptrace_request(struct task_struct *child, long request, case PTRACE_KILL: if (child->exit_state) /* already dead */ return 0; - return ptrace_resume(child, request, SIGKILL); + return send_sig_info(SIGKILL, SEND_SIG_NOINFO, child);
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK case PTRACE_GETREGSET: