linux-kernel - Re: [PATCH 0/2] Revert "fs/exec: allow to unshare a time namespace on vfork+exec"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <166309079807.1930124.8643254685134544071.b4-ty@chromium.org>
Date:   Tue, 13 Sep 2022 10:40:02 -0700
From:   Kees Cook <keescook@...omium.org>
To:     avagin@...gle.com
Cc:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Revert "fs/exec: allow to unshare a time namespace on vfork+exec"

On Tue, 13 Sep 2022 03:25:49 -0700, Andrei Vagin wrote:
> This reverts commits:
> 133e2d3e81de ("fs/exec: allow to unshare a time namespace on vfork+exec")
> 6342140db660 ("selftests/timens: add a test for vfork+exit")
> 
> Alexey pointed out a few undesirable side effects of the reverted change.
> First, it doesn't take into account that CLONE_VFORK can be used with
> CLONE_THREAD. Second, a child process doesn't enter a target time name-space,
> if its parent dies before the child calls exec. It happens because the parent
> clears vfork_done.
> 
> [...]

Applied to for-linus/execve, thanks!

[1/2] Revert "selftests/timens: add a test for vfork+exit"
      https://git.kernel.org/kees/c/2b1e8921fc35
[2/2] Revert "fs/exec: allow to unshare a time namespace on vfork+exec"
      https://git.kernel.org/kees/c/33a2d6bc3480

-- 
Kees Cook