linux-kernel - Re: [PATCH] do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak

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Message-ID: <20240122-dahin-werden-289c66dfc773@brauner>
Date: Mon, 22 Jan 2024 12:03:10 +0100
From: Christian Brauner <brauner@...nel.org>
To: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
Cc: Christian Brauner <brauner@...nel.org>,
	Jeff Layton <jlayton@...nel.org>,
	Amir Goldstein <amir73il@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>,
	linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzbot+09b349b3066c2e0b1e96@...kaller.appspotmail.com,
	Chuck Lever <chuck.lever@...cle.com>
Subject: Re: [PATCH] do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak

On Fri, 19 Jan 2024 07:39:06 -0800, Nikita Zhandarovich wrote:
> syzbot identified a kernel information leak vulnerability in
> do_sys_name_to_handle() and issued the following report [1].
> 
> [1]
> "BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
> BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40
>  instrument_copy_to_user include/linux/instrumented.h:114 [inline]
>  _copy_to_user+0xbc/0x100 lib/usercopy.c:40
>  copy_to_user include/linux/uaccess.h:191 [inline]
>  do_sys_name_to_handle fs/fhandle.c:73 [inline]
>  __do_sys_name_to_handle_at fs/fhandle.c:112 [inline]
>  __se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94
>  __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94
>  ...
> 
> [...]

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] do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak
      https://git.kernel.org/vfs/vfs/c/1b380b340f19