commit cad81bc2529ab8c62b6fdc83a1c0c7f4a87209eb
author Oleg Nesterov <oleg@redhat.com> Mon Apr 27 01:41:34 2009 +0200
committer James Morris <jmorris@namei.org> Mon Apr 27 20:30:51 2009 +1000
tree 8d056ddb9db3db5eeba6a6fb629efe2c05b67ea0
parent ce8a7424d23a36f043d0de8484f888971c831119

ptrace: ptrace_attach: fix the usage of ->cred_exec_mutex

ptrace_attach() needs task->cred_exec_mutex, not current->cred_exec_mutex.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

kernel/ptrace.c

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index dfcd83c..0692ab5 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -188,7 +188,7 @@
 	/* Protect exec's credential calculations against our interference;
 	 * SUID, SGID and LSM creds get determined differently under ptrace.
 	 */
-	retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+	retval = mutex_lock_interruptible(&task->cred_exec_mutex);
 	if (retval  < 0)
 		goto out;
 
@@ -232,7 +232,7 @@
 bad:
 	write_unlock_irqrestore(&tasklist_lock, flags);
 	task_unlock(task);
-	mutex_unlock(&current->cred_exec_mutex);
+	mutex_unlock(&task->cred_exec_mutex);
 out:
 	return retval;
 }