diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2014-01-24 03:55:52 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-24 04:37:02 +0400 |
| commit | 98611e4e6a2b4a03fd2d4750cce8e4455a995c8d (patch) | |
| tree | 5979f4761ba67616eaeb3c5fd6fd19dbd265f9f2 /kernel | |
| parent | 63e46b95e9eae1161832bf45cb40bbad37bfb182 (diff) | |
| download | linux-98611e4e6a2b4a03fd2d4750cce8e4455a995c8d.tar.xz | |
exec: kill task_struct->did_exec
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/fork.c | 1 | ||||
| -rw-r--r-- | kernel/sys.c | 5 |
2 files changed, 2 insertions, 4 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index b6dd0bbf4240..a17621c6cd42 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1226,7 +1226,6 @@ static struct task_struct *copy_process(unsigned long clone_flags, if (!try_module_get(task_thread_info(p)->exec_domain->module)) goto bad_fork_cleanup_count; - p->did_exec = 0; delayacct_tsk_init(p); /* Must remain after dup_task_struct() */ copy_flags(clone_flags, p); INIT_LIST_HEAD(&p->children); diff --git a/kernel/sys.c b/kernel/sys.c index c72311324ea7..ecd3ea12f72a 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -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; |