From: Qing Wang <wangqing7171@gmail.com>
To: gaoxiang17@xiaomi.com, oleg@redhat.com, viro@zeniv.linux.org.uk,
brauner@kernel.org
Cc: mjguzik@gmail.com, Liam.Howlett@oracle.com,
gxxa03070307@gmail.com, joel.granados@kernel.org,
linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com
Subject: Re: [PATCH] pid: Add a judgment for ns null in pid_nr_ns
Date: Sun, 4 Jan 2026 15:25:36 +0800 [thread overview]
Message-ID: <20260104072536.883920-1-wangqing7171@gmail.com> (raw)
In-Reply-To: <20250802022123.3536934-1-gxxa03070307@gmail.com>
On Sat, 02 Aug 2025 at 10:21, Xiang Gao <gxxa03070307@gmail.com> wrote:
> __task_pid_nr_ns
> ns = task_active_pid_ns(current);
> pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);
> if (pid && ns->level <= pid->level) {
Hi,
There was a bug report about the UAF(tsk->signal) in __task_pid_nr_ns, and I'm
not sure whether it's related to this issue you're discussing. What do you
think?
[syzbot] [perf?] KASAN: slab-use-after-free Read in __task_pid_nr_ns
https://syzkaller.appspot.com/bug?extid=e0378d4f4fe57aa2bdd0
Qing.
next prev parent reply other threads:[~2026-01-04 7:25 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-02 2:21 [PATCH] pid: Add a judgment for ns null in pid_nr_ns Xiang Gao
2025-08-02 2:25 ` Al Viro
2025-08-02 8:43 ` Oleg Nesterov
[not found] ` <15b18541f37447dd8d5dbd8012662f67@xiaomi.com>
2025-08-02 5:52 ` 答复: [External Mail]Re: " Al Viro
2025-08-02 5:54 ` Al Viro
[not found] ` <c7968242db914979953277226fe55fc8@xiaomi.com>
2025-08-02 8:04 ` 答复: " Al Viro
2025-08-02 8:45 ` Oleg Nesterov
[not found] ` <80be47cb31d14ffc9f9a7d8d4408ab0a@xiaomi.com>
2025-08-04 11:49 ` Oleg Nesterov
2025-08-04 12:14 ` Christian Brauner
2025-08-04 12:44 ` Oleg Nesterov
2025-08-05 12:43 ` Oleg Nesterov
2025-08-08 14:56 ` Christian Brauner
2025-08-10 15:42 ` Oleg Nesterov
[not found] ` <aa5272ddcec944e2a35ca7104f6a86bf@xiaomi.com>
2025-08-05 19:43 ` 答复: [External Mail]Re: " Oleg Nesterov
2025-08-08 14:54 ` Christian Brauner
2025-08-10 17:36 ` [PATCH 1/4] pid: make __task_pid_nr_ns(ns => NULL) safe for zombie callers Oleg Nesterov
2025-08-10 17:36 ` [PATCH 2/4] pid: introduce task_ppid_vnr() Oleg Nesterov
2025-08-10 17:36 ` [PATCH 3/4] pid: change bacct_add_tsk() to use task_ppid_nr_ns() Oleg Nesterov
2025-08-10 17:36 ` [PATCH 4/4] pid: change task_state() " Oleg Nesterov
2025-08-19 11:40 ` [PATCH] pid: Add a judgment for ns null in pid_nr_ns Christian Brauner
2025-08-19 14:25 ` Oleg Nesterov
2025-09-01 15:30 ` Oleg Nesterov
2025-09-01 15:44 ` Mateusz Guzik
2025-09-01 15:55 ` Mateusz Guzik
2025-09-02 14:37 ` Oleg Nesterov
2026-01-04 7:25 ` Qing Wang [this message]
-- strict thread matches above, loose matches on Subject: below --
2025-02-11 6:17 Xiang Gao
2025-02-11 6:49 ` Baoquan He
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260104072536.883920-1-wangqing7171@gmail.com \
--to=wangqing7171@gmail.com \
--cc=Liam.Howlett@oracle.com \
--cc=brauner@kernel.org \
--cc=gaoxiang17@xiaomi.com \
--cc=gxxa03070307@gmail.com \
--cc=joel.granados@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lorenzo.stoakes@oracle.com \
--cc=mjguzik@gmail.com \
--cc=oleg@redhat.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox