For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.
***
Subject: [PATCH] exec: do not call sched_mm_cid_after_execve() on exec fail
Author: wangjinchao600@gmail.com
sched_mm_cid_after_execve() is called from the failure path
of bprm_execve(). At that point exec has not completed successfully,
so updating the mm CID state is incorrect and can trigger a panic,
as reported by syzbot.
Remove the call from the exec failure path.
#syz test
Reported-by: syzbot+9ca2c6e6b098bf5ae60a@syzkaller.appspotmail.com
Signed-off-by: Jinchao Wang <wangjinchao600@gmail.com>
---
fs/exec.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/fs/exec.c b/fs/exec.c
index 9d5ebc9d15b0..9044a75d26ab 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1773,7 +1773,6 @@ static int bprm_execve(struct linux_binprm *bprm)
if (bprm->point_of_no_return && !fatal_signal_pending(current))
force_fatal_sig(SIGSEGV);
- sched_mm_cid_after_execve(current);
rseq_force_update();
current->in_execve = 0;
--
2.43.0