netdev - Re: [PATCH] Add JMEMCMP to Berkeley Packet Filters

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

Message-ID: <1297344292.2493.3.camel@edumazet-laptop>
Date:	Thu, 10 Feb 2011 14:24:52 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ian Molton <ian.molton@...labora.co.uk>
Cc:	netdev@...r.kernel.org, rdunlap@...otime.net, isdn@...ux-pingi.de,
	paulus@...ba.org, arnd@...db.de, davem@...emloft.net,
	herbert@...dor.apana.org.au, ebiederm@...ssion.com,
	alban.crequy@...labora.co.uk
Subject: Re: [PATCH] Add JMEMCMP to Berkeley Packet Filters

Le jeudi 10 février 2011 à 12:31 +0000, Ian Molton a écrit :
> This patch allows a data section to be specified for BPF.
> 
> This is made use of by a MEMCMP like instruction.
> 
> Testsuite here:
> http://git.collabora.co.uk/?p=user/ian/check-bpf.git;a=summary
> 
> Issues:
> * Do I need to update the headers for all arches, or just generic
> * Can sk_run_filter() be called in a context where kmalloc(GFP_KERNEL) is
>   not allowed (I think not)

You cannot use GFP_KERNEL in sk_run_filter() : We run in {soft}irq mode,
in input path.

> * Data section allocated with second call to sock_kmalloc().
> * Should the patch be broken into two - one to add the data uploading,
>   one to add the JMEMCMP insn. ?

May I ask why it is needed at all ?

Then, why only one JMEMCMP would be allowed in a filter ?



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html