exec:check_unsafe_exec: use while_each_thread() rather than next_thread()

next_thread() should be avoided, change check_unsafe_exec() to use
while_each_thread().

Nobody except signal->curr_target actually needs next_thread-like code,
and we need to change (fix) this interface.  This particular code is fine,
p == current.  But in general the code like this can loop forever if p
exits and next_thread(t) can't reach the unhashed thread.

This also saves 32 bytes.

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>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 9cbad5b0187e..81ae6212187a 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1243,10 +1243,11 @@ static int check_unsafe_exec(struct linux_binprm *bprm)
         if (current->no_new_privs)
                 bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS;
 
+        t = p;
         n_fs = 1;
         spin_lock(&p->fs->lock);
         rcu_read_lock();
-        for (t = next_thread(p); t != p; t = next_thread(t)) {
+        while_each_thread(p, t) {
                 if (t->fs == p->fs)
                         n_fs++;
         }