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

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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