linux-kernel - Re: xprtrdma: Prevent inline overflow

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Message-ID: <2e64a42f-9e0d-9086-3279-d32aaad4f57c@canonical.com>
Date:   Wed, 15 Jul 2020 17:07:26 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Chuck Lever <chuck.lever@...cle.com>
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Bruce Fields <bfields@...ldses.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: xprtrdma: Prevent inline overflow

On 15/07/2020 17:05, Chuck Lever wrote:
> 
> 
>> On Jul 15, 2020, at 11:56 AM, Colin Ian King <colin.king@...onical.com> wrote:
>>
>> Hi,
>>
>> Static analysis with Coverity has found a potential issue with the
>> header size calculations in source net/sunrpc/xprtrdma/rpc_rdma.c in
>> functions rpcrdma_max_call_header_size and rpcrdma_max_reply_header_size.
>>
>> The commit in question is relatively old:
>>
>> commit 302d3deb20682a076e1ab551821cacfdc81c5e4f
>> Author: Chuck Lever <chuck.lever@...cle.com>
>> Date:   Mon May 2 14:41:05 2016 -0400
>>
>>    xprtrdma: Prevent inline overflow
>>
>> The two issues are as follows:
>>
>> Issue #1:
>>
>> 66 static unsigned int rpcrdma_max_call_header_size(unsigned int maxsegs)
>> 67 {
>> 68        unsigned int size;
>> 69
>> 70        /* Fixed header fields and list discriminators */
>>
>> Unused value (UNUSED_VALUE)
>>
>> 71        size = RPCRDMA_HDRLEN_MIN;
>> 72
>> 73        /* Maximum Read list size */
>> 74        size = maxsegs * rpcrdma_readchunk_maxsz * sizeof(__be32);
>> 75
>>
>> should the size assignment on line 74 be instead:
>>
>> 	size += maxsegs * rpcrdma_readchunk_maxsz * sizeof(__be32);
>>
>>
>> Issue #2:
>>
>> 89 static unsigned int rpcrdma_max_reply_header_size(unsigned int maxsegs)
>> 90 {
>> 91        unsigned int size;
>> 92
>> 93        /* Fixed header fields and list discriminators */
>>
>> Unused value (UNUSED_VALUE)
>>
>> 94        size = RPCRDMA_HDRLEN_MIN;
>> 95
>> 96        /* Maximum Write list size */
>> 97        size = sizeof(__be32);          /* segment count */
>>
>> should the size assignment in line 97 be instead:
>>
>> 	size += sizeof(__be32)?
> 
> Colin, Yes to both questions. Can you send a fix to Anna?

OK, thanks for confirming. Will send a fix in the next hour or so.

Colin
> 
> --
> Chuck Lever
> 
> 
>