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signals: move cred_guard_mutex from task_struct to signal_struct

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Oleg Nesterov pointed out we have to prevent multiple-threads-inside-exec
itself and we can reuse ->cred_guard_mutex for it.  Yes, concurrent
execve() has no worth.

Let's move ->cred_guard_mutex from task_struct to signal_struct.  It
naturally prevent multiple-threads-inside-exec.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2010-10-27 15:34:08 -07:00 • committed by Linus Torvalds
parent b840115083
commit 9b1bf12d5d
8 changed files with 21 additions and 20 deletions
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include/linux/tracehook.h
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@ -150,7 +150,7 @@ static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step)
*
* Return %LSM_UNSAFE_* bits applied to an exec because of tracing.
*
* @task->cred_guard_mutex is held by the caller through the do_execve().
* @task->signal->cred_guard_mutex is held by the caller through the do_execve().
*/
static inline int tracehook_unsafe_exec(struct task_struct *task)
{