Re: [PATCH] fs/pidfs: when time ns disabled add check for ioctl

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To: Edward Adam Davis <eadavis@xxxxxx>
Subject: Re: [PATCH] fs/pidfs: when time ns disabled add check for ioctl
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Sun, 21 Jul 2024 11:59:04 +0100
Cc: syzbot+34a0ee986f61f15da35d@xxxxxxxxxxxxxxxxxxxxxxxxx, brauner@xxxxxxxxxx, jack@xxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, syzkaller-bugs@xxxxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx
In-reply-to: <tencent_7FAE8DB725EE0DD69236DDABDDDE195E4F07@qq.com>

On Sun, Jul 21, 2024 at 02:23:12PM +0800, Edward Adam Davis wrote:
> syzbot call pidfd_ioctl() with cmd "PIDFD_GET_TIME_NAMESPACE" and disabled
> CONFIG_TIME_NS, since time_ns is NULL, it will make NULL ponter deref in
> open_namespace.

what about PIDFD_GET_TIME_FOR_CHILDREN_NAMESPACE?

References:
- [syzbot] [fs?] BUG: unable to handle kernel NULL pointer dereference in path_from_stashed
  - From: syzbot
- [PATCH] fs/pidfs: when time ns disabled add check for ioctl
  - From: Edward Adam Davis

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