netdev - Re: [PATCH v2 net] af_unix: Fix msg_controllen test in scm_pidfd_recv() for MSG_CMSG

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Date: Mon, 4 Sep 2023 10:27:35 +0200
From: Christian Brauner <brauner@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org,
	Heiko Carstens <hca@...ux.ibm.com>,
	Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
Subject: Re: [PATCH v2 net] af_unix: Fix msg_controllen test in
 scm_pidfd_recv() for MSG_CMSG_COMPAT.

On Fri, Sep 01, 2023 at 04:46:04PM -0700, Kuniyuki Iwashima wrote:
> Heiko Carstens reported that SCM_PIDFD does not work with MSG_CMSG_COMPAT
> because scm_pidfd_recv() always checks msg_controllen against sizeof(struct
> cmsghdr).
> 
> We need to use sizeof(struct compat_cmsghdr) for the compat case.
> 
> Fixes: 5e2ff6704a27 ("scm: add SO_PASSPIDFD and SCM_PIDFD")
> Reported-by: Heiko Carstens <hca@...ux.ibm.com>
> Closes: https://lore.kernel.org/netdev/20230901200517.8742-A-hca@linux.ibm.com/
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
> Tested-by: Heiko Carstens <hca@...ux.ibm.com>
> Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
> ---
> v2:
>   * Correct `len` in compat/non-compat case
> 
> v1: https://lore.kernel.org/netdev/20230901222033.71400-1-kuniyu@amazon.com/T/#u
> ---

Acked-by: Christian Brauner <brauner@...nel.org>