linux-kernel - Re: [PATCH] Fix memory overwriting issue when copy an address to user space

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Message-ID: <20200717105013.76ea6a7f@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 17 Jul 2020 10:50:13 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     lebon zhou <lebon.zhou@...il.com>
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix memory overwriting issue when copy an address to
 user space

On Fri, 17 Jul 2020 10:31:54 +0000 lebon zhou wrote:
> When application provided buffer size less than sockaddr_storage, then
> kernel will overwrite some memory area which may cause memory corruption,
> e.g.: in recvmsg case, let msg_name=malloc(8) and msg_namelen=8, then
> usually application can call recvmsg successful but actually application
> memory get corrupted.
> 
> Fix to return EINVAL when application buffer size less than
> sockaddr_storage.
> 
> Signed-off-by: lebon.zhou <lebon.zhou@...il.com>

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