linux-hardening - Re: [PATCH] fs: WARN when f_count resurrection is attempted

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Date: Sat,  4 May 2024 11:43:32 +0200
From: Christian Brauner <brauner@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Christian Brauner <brauner@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jens Axboe <axboe@...nel.dk>,
	Jann Horn <jannh@...gle.com>,
	Jan Kara <jack@...e.cz>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] fs: WARN when f_count resurrection is attempted

On Fri, 03 May 2024 13:16:25 -0700, Kees Cook wrote:
> It should never happen that get_file() is called on a file with
> f_count equal to zero. If this happens, a use-after-free condition
> has happened[1], and we need to attempt a best-effort reporting of
> the situation to help find the root cause more easily. Additionally,
> this serves as a data corruption indicator that system owners using
> warn_limit or panic_on_warn would like to have detected.
> 
> [...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/1] fs: WARN when f_count resurrection is attempted
      https://git.kernel.org/vfs/vfs/c/f6bdc7865ef4