linux-kernel - Re: [PATCH V2] Squashfs: sanity check symbolic link size

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Message-ID: <20240813-chemie-rotation-5ab2a178d043@brauner>
Date: Tue, 13 Aug 2024 13:57:01 +0200
From: Christian Brauner <brauner@...nel.org>
To: Phillip Lougher <phillip@...ashfs.org.uk>
Cc: Christian Brauner <brauner@...nel.org>,
	Lizhi Xu <lizhi.xu@...driver.com>,
	syzbot+24ac24ff58dc5b0d26b9@...kaller.appspotmail.com,
	akpm@...ux-foundation.org,
	viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] Squashfs: sanity check symbolic link size

On Mon, 12 Aug 2024 00:28:21 +0100, Phillip Lougher wrote:
> Syzkiller reports a "KMSAN: uninit-value in pick_link" bug.
> 
> This is caused by an uninitialised page, which is ultimately caused
> by a corrupted symbolic link size read from disk.
> 
> The reason why the corrupted symlink size causes an uninitialised
> page is due to the following sequence of events:
> 
> [...]

I've grabbed this. Let me know if this needs to go through elsewhere.

---

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes 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.fixes

[1/1] Squashfs: sanity check symbolic link size
      https://git.kernel.org/vfs/vfs/c/810ee43d9cd2