netdev - Re: [PATCH v2 bpf-next 0/2] sockmap: fix sg api usage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Fri, 30 Mar 2018 22:52:32 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     John Fastabend <john.fastabend@...il.com>,
        Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v2 bpf-next 0/2] sockmap: fix sg api usage

On 03/30/2018 05:39 AM, John Fastabend wrote:
> On 03/29/2018 05:20 PM, Prashant Bhole wrote:
>> These patches fix sg api usage in sockmap. Previously sockmap didn't
>> use sg_init_table(), which caused hitting BUG_ON in sg api, when
>> CONFIG_DEBUG_SG is enabled
>>
>> v1: added sg_init_table() calls wherever needed.
>>
>> v2:
>> - Patch1 adds new helper function in sg api. sg_init_marker()
>> - Patch2 sg_init_marker() and sg_init_table() in appropriate places
>>
>> Backgroud:
>> While reviewing v1, John Fastabend raised a valid point about
>> unnecessary memset in sg_init_table() because sockmap uses sg table
>> which embedded in a struct. As enclosing struct is zeroed out, there
>> is unnecessary memset in sg_init_table.
>>
>> So Daniel Borkmann suggested to define another static inline function
>> in scatterlist.h which only initializes sg_magic. Also this function 
>> will be called from sg_init_table. From this suggestion I defined a
>> function sg_init_marker() which sets sg_magic and calls sg_mark_end()
> 
> Series looks good to me thanks for finding and fixing this!

Applied to bpf-next, thanks Prashant!