linux-kernel - Re: [PATCH] audit: remove the audit freelist

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]

Date:   Wed, 30 Nov 2016 19:04:11 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Florian Westphal <fw@...len.de>
Cc:     linux-kernel@...r.kernel.org, linux-audit@...hat.com,
        Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH] audit: remove the audit freelist

On Tue, Nov 15, 2016 at 8:16 AM, Florian Westphal <fw@...len.de> wrote:
> allows better debugging as freeing audit buffers now always honors slub
> debug hooks (e.g. object poisoning) and leak checker can detect the
> free operation.
>
> Removal also results in a small speedup (using
> single rule 'iptables -A INPUT -i lo -j AUDIT --type drop'):
>
> super_netperf 4 -H 127.0.0.1 -l 360 -t UDP_RR -- -R 1 -m 64
> Before:
> 294953
> After:
> 298013
>
> (alloc/free no longer serializes on spinlock, allocator can use percpu
>  pool).
>
> Signed-off-by: Florian Westphal <fw@...len.de>
> ---
>  kernel/audit.c | 53 ++++++++---------------------------------------------
>  1 file changed, 8 insertions(+), 45 deletions(-)

Sorry for the delay, I was hoping to have some time to play around
with this and offer a more meaningful comment ... I've often wondered
about converting audit_buffer, and audit_context for that matter, over
to their own kmem_cache; have you considered that?  Or was this
proposed due to simplicity?

-- 
paul moore
www.paul-moore.com