[PATCH] ptrace_notify() locking

Spotted by Dawson Engler.

recalc_signpending() needs tsk->sighand->siglock.

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 287b81b65c348aeaca1e644d769d33fd20afcb35..bed9bd42525bd473d8ec14e2cd7e42063e781cee 100644 (file)
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -336,5 +336,8 @@ void ptrace_notify(int exit_code)
        /*
         * Signals sent while we were stopped might set TIF_SIGPENDING.
         */
+
+       spin_lock_irq(&current->sighand->siglock);
        recalc_sigpending();
+       spin_unlock_irq(&current->sighand->siglock);
 }