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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: 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>
This commit is contained in:
Oleg Nesterov 2009-04-27 01:41:34 +02:00 committed by James Morris
parent ce8a7424d2
commit cad81bc252
1 changed files with 2 additions and 2 deletions
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4
kernel/ptrace.c
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@ -188,7 +188,7 @@ int ptrace_attach(struct task_struct *task)
/* Protect exec's credential calculations against our interference; /* Protect exec's credential calculations against our interference;
* SUID, SGID and LSM creds get determined differently under ptrace. * 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) if (retval < 0)
goto out; goto out;
@ -232,7 +232,7 @@ repeat:
bad: bad:
write_unlock_irqrestore(&tasklist_lock, flags); write_unlock_irqrestore(&tasklist_lock, flags);
task_unlock(task); task_unlock(task);
mutex_unlock(&current->cred_exec_mutex); mutex_unlock(&task->cred_exec_mutex);
out: out:
return retval; return retval;
} }