linux-ext4 - Re: [PATCH 11/13] fuse: fix UAF in rcu pathwalks

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Message-ID: <CAJfpegtJtrCTeRCT3w3qCLWsoDopePwUXmL5O9JtJfSJg17LNg@mail.gmail.com>
Date: Mon, 5 Feb 2024 14:51:53 +0100
From: Miklos Szeredi <miklos@...redi.hu>
To: Christian Brauner <brauner@...nel.org>
Cc: Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org, 
	Linus Torvalds <torvalds@...ux-foundation.org>, linux-ext4@...r.kernel.org, 
	linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org
Subject: Re: [PATCH 11/13] fuse: fix UAF in rcu pathwalks

On Mon, 5 Feb 2024 at 13:31, Christian Brauner <brauner@...nel.org> wrote:
>
> On Sun, Feb 04, 2024 at 02:17:37AM +0000, Al Viro wrote:
> > ->permission(), ->get_link() and ->inode_get_acl() might dereference
> > ->s_fs_info (and, in case of ->permission(), ->s_fs_info->fc->user_ns
> > as well) when called from rcu pathwalk.
> >
> > Freeing ->s_fs_info->fc is rcu-delayed; we need to make freeing ->s_fs_info
> > and dropping ->user_ns rcu-delayed too.
> >
> > Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> > ---
>
> Reviewed-by: Christian Brauner <brauner@...nel.org>

Acked-by: Miklos Szeredi <mszeredi@...hat.com>