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exec: kill task_struct->did_exec

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We can kill either task->did_exec or PF_FORKNOEXEC, they are mutually
exclusive.  The patch kills ->did_exec because it has a single user.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2014-01-23 15:55:52 -08:00 • committed by Linus Torvalds
commit 98611e4e6a
4 changed files with 2 additions and 6 deletions
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5
kernel/sys.c
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@ -895,8 +895,7 @@ SYSCALL_DEFINE1(times, struct tms __user *, tbuf)
* only important on a multi-user system anyway, to make sure one user
* can't send a signal to a process owned by another. -TYT, 12/12/91
*
* Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
* LBT 04.03.94
* !PF_FORKNOEXEC check to conform completely to POSIX.
*/
SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
{
@ -932,7 +931,7 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
if (task_session(p) != task_session(group_leader))
goto out;
err = -EACCES;
if (p->did_exec)
if (!(p->flags & PF_FORKNOEXEC))
goto out;
} else {
err = -ESRCH;