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Commit cad81bc2 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by James Morris
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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: default avatarOleg Nesterov <oleg@redhat.com>
Acked-by: default avatarRoland McGrath <roland@redhat.com>
Acked-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent ce8a7424

kernel/ptrace.c

+2 −2
Original line number Diff line number Diff line
@@ -188,7 +188,7 @@ int ptrace_attach(struct task_struct *task) 
	/* 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 @@ repeat: 
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;

}