linux-kernel - Re: [PATCH] fs: romfs: Fix potential uninitialized memory leak

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Date: Sat, 20 Jan 2024 08:28:42 +0100
From: Christian Brauner <brauner@...nel.org>
To: Fullway Wang <fullwaywang@...look.com>
Cc: dhowells@...hat.com, linux-kernel@...r.kernel.org, 
	fullwaywang@...cent.com, jannh@...gle.com, akpm@...ux-foundation.org
Subject: Re: [PATCH] fs: romfs: Fix potential uninitialized memory leak

On Fri, Jan 19, 2024 at 03:21:04PM +0100, Christian Brauner wrote:
> On Thu, 18 Jan 2024 15:14:12 +0800, Fullway Wang wrote:
> > romfs_dev_read() fetches a caller-supplied number of bytes from the
> > backing device in an all-or-nothing manner.
> > 
> > Commit bcf85fc fixed CVE-2020-29371, which exposed the bug when
> > the requested length crossed the filesystem size limit, the number
> > of bytes to requested was truncated. However, in romfs_readdir()
> > in super.c, the requested number is firstly truncated with
> > romfs_dev_strnlen() then passed to romfs_dev_read(), leaving
> > the bug exploitable still.
> > 
> > [...]
> 
> 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: romfs: Fix potential uninitialized memory leak
>       https://git.kernel.org/vfs/vfs/c/530041d36e37

This fails to even compile. Dropped.