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authorOleg Nesterov <oleg@redhat.com>2014-01-23 15:55:49 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:37:02 -0800
commit83f62a2eacb1d6945c78523f20e0c34b5d94913c (patch)
treee42b10740afd8489319388018fa1d6d10be22482 /fs/exec.c
parent68ce670b6e8edc30551862e7f6a306e45389e189 (diff)
downloadlinux-83f62a2eacb1d6945c78523f20e0c34b5d94913c.tar.gz
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>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 9cbad5b0187..81ae6212187 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++;
}