netdev - Re: [PATCH net] net: fix use-after-free in the netdev_nl_sock_priv

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20250331124417.GB185681@horms.kernel.org>
Date: Mon, 31 Mar 2025 13:44:17 +0100
From: Simon Horman <horms@...nel.org>
To: Taehee Yoo <ap420073@...il.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
	edumazet@...gle.com, andrew+netdev@...n.ch, netdev@...r.kernel.org,
	jdamato@...tly.com, sdf@...ichev.me, almasrymina@...gle.com,
	xuanzhuo@...ux.alibaba.com
Subject: Re: [PATCH net] net: fix use-after-free in the
 netdev_nl_sock_priv_destroy()

On Fri, Mar 28, 2025 at 06:22:37AM +0000, Taehee Yoo wrote:
> In the netdev_nl_sock_priv_destroy(), an instance lock is acquired
> before calling net_devmem_unbind_dmabuf(), then releasing an instance
> lock(netdev_unlock(binding->dev)).
> However, a binding is freed in the net_devmem_unbind_dmabuf().
> So using a binding after net_devmem_unbind_dmabuf() occurs UAF.
> To fix this UAF, it needs to use temporary variable.
> 
> Fixes: ba6f418fbf64 ("net: bubble up taking netdev instance lock to callers of net_devmem_unbind_dmabuf()")
> Signed-off-by: Taehee Yoo <ap420073@...il.com>

Reviewed-by: Simon Horman <horms@...nel.org>