* re: xprtrdma: Prevent inline overflow
@ 2020-07-15 15:56 Colin Ian King
2020-07-15 16:05 ` Chuck Lever
0 siblings, 1 reply; 3+ messages in thread
From: Colin Ian King @ 2020-07-15 15:56 UTC (permalink / raw)
To: Trond Myklebust, Anna Schumaker, J. Bruce Fields, Chuck Lever,
David S. Miller, Jakub Kicinski, linux-nfs, netdev
Cc: linux-kernel
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@oracle.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
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: xprtrdma: Prevent inline overflow
2020-07-15 15:56 xprtrdma: Prevent inline overflow Colin Ian King
@ 2020-07-15 16:05 ` Chuck Lever
2020-07-15 16:07 ` Colin Ian King
0 siblings, 1 reply; 3+ messages in thread
From: Chuck Lever @ 2020-07-15 16:05 UTC (permalink / raw)
To: Colin Ian King
Cc: Trond Myklebust, Anna Schumaker, Bruce Fields, David S. Miller,
Jakub Kicinski, Linux NFS Mailing List, netdev, linux-kernel
> On Jul 15, 2020, at 11:56 AM, Colin Ian King <colin.king@canonical.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@oracle.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?
--
Chuck Lever
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: xprtrdma: Prevent inline overflow
2020-07-15 16:05 ` Chuck Lever
@ 2020-07-15 16:07 ` Colin Ian King
0 siblings, 0 replies; 3+ messages in thread
From: Colin Ian King @ 2020-07-15 16:07 UTC (permalink / raw)
To: Chuck Lever
Cc: Trond Myklebust, Anna Schumaker, Bruce Fields, David S. Miller,
Jakub Kicinski, Linux NFS Mailing List, netdev, linux-kernel
On 15/07/2020 17:05, Chuck Lever wrote:
>
>
>> On Jul 15, 2020, at 11:56 AM, Colin Ian King <colin.king@canonical.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@oracle.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
>
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-07-15 15:56 xprtrdma: Prevent inline overflow Colin Ian King
2020-07-15 16:05 ` Chuck Lever
2020-07-15 16:07 ` Colin Ian King
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