linux-kernel - Re: [PATCH] af_iucv: Move sockaddr length checks to before accessing sa

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Date:   Wed, 14 Jun 2017 16:49:06 +0200
From:   Julian Wiedmann <jwi@...ux.vnet.ibm.com>
To:     Mateusz Jurczyk <mjurczyk@...gle.com>,
        Ursula Braun <ubraun@...ux.vnet.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] af_iucv: Move sockaddr length checks to before accessing
 sa_family in bind and connect handlers

On 06/13/2017 07:42 PM, Mateusz Jurczyk wrote:
> Verify that the caller-provided sockaddr structure is large enough to
> contain the sa_family field, before accessing it in bind() and connect()
> handlers of the AF_IUCV socket. Since neither syscall enforces a minimum
> size of the corresponding memory region, very short sockaddrs (zero or
> one byte long) result in operating on uninitialized memory while
> referencing .sa_family.
> 
> Signed-off-by: Mateusz Jurczyk <mjurczyk@...gle.com>
Thanks Mateusz!

Fixes: 52a82e23b9f2
Acked-by: Julian Wiedmann <jwi@...ux.vnet.ibm.com>