linux-kernel - Re: [PATCH] fs: writeback: fix use-after-free in __mark_inode

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20250731-manisch-zuerst-0aee81784858@brauner>
Date: Thu, 31 Jul 2025 12:26:55 +0200
From: Christian Brauner <brauner@...nel.org>
To: tj@...nel.org,
	jack@...e.cz,
	Jiufei Xue <jiufei.xue@...sung.com>
Cc: Christian Brauner <brauner@...nel.org>,
	cgroups@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: writeback: fix use-after-free in __mark_inode_dirty()

On Mon, 28 Jul 2025 18:07:15 +0800, Jiufei Xue wrote:
> An use-after-free issue occurred when __mark_inode_dirty() get the
> bdi_writeback that was in the progress of switching.
> 
> CPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1
> ......
> pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : __mark_inode_dirty+0x124/0x418
> lr : __mark_inode_dirty+0x118/0x418
> sp : ffffffc08c9dbbc0
> ........
> Call trace:
>  __mark_inode_dirty+0x124/0x418
>  generic_update_time+0x4c/0x60
>  file_modified+0xcc/0xd0
>  ext4_buffered_write_iter+0x58/0x124
>  ext4_file_write_iter+0x54/0x704
>  vfs_write+0x1c0/0x308
>  ksys_write+0x74/0x10c
>  __arm64_sys_write+0x1c/0x28
>  invoke_syscall+0x48/0x114
>  el0_svc_common.constprop.0+0xc0/0xe0
>  do_el0_svc+0x1c/0x28
>  el0_svc+0x40/0xe4
>  el0t_64_sync_handler+0x120/0x12c
>  el0t_64_sync+0x194/0x198
> 
> [...]

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] fs: writeback: fix use-after-free in __mark_inode_dirty()
      https://git.kernel.org/vfs/vfs/c/f8371b50ceaa