linux-kernel - Re: [PATCH net] fix a braino in cmsghdr_from_user_compat_to

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Date:   Mon, 27 Jul 2020 13:25:58 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     viro@...iv.linux.org.uk
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        nbowler@...conx.ca
Subject: Re: [PATCH net] fix a braino in cmsghdr_from_user_compat_to_kern()

From: Al Viro <viro@...iv.linux.org.uk>
Date: Mon, 27 Jul 2020 19:22:20 +0100

> 	commit 547ce4cfb34c ("switch cmsghdr_from_user_compat_to_kern() to
> copy_from_user()") missed one of the places where ucmlen should've been
> replaced with cmsg.cmsg_len, now that we are fetching the entire struct
> rather than doing it field-by-field.
> 
> 	As the result, compat sendmsg() with several different-sized cmsg
> attached started to fail with EINVAL.  Trivial to fix, fortunately.
> 
> Reported-by: Nick Bowler <nbowler@...conx.ca>
> Tested-by: Nick Bowler <nbowler@...conx.ca>
> Fixes: 547ce4cfb34c ("switch cmsghdr_from_user_compat_to_kern() to copy_from_user()")
> 
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>

Applied, thanks Al.