linux-kernel - Re: [PATCH] audit: always enable syscall auditing when supported and audit is enabled

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Message-ID: <4fb6def1-a1d9-8af0-394c-f92224884d18@nokia.com>
Date:   Mon, 28 Jan 2019 14:36:49 +0000
From:   "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
To:     Paul Moore <paul@...l-moore.com>
CC:     Paul Moore <pmoore@...hat.com>,
        "linux-audit@...hat.com" <linux-audit@...hat.com>,
        Richard Guy Briggs <rbriggs@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] audit: always enable syscall auditing when supported and
 audit is enabled

Hello Paul,

On 28/01/2019 15:19, Paul Moore wrote:
>>> time also enables syscall auditing; this patch simplifies the Kconfig
>>> menus by removing the option to disable syscall auditing when audit
>>> is selected and the target arch supports it.
>>>
>>> Signed-off-by: Paul Moore <pmoore@...hat.com>
>> this patch is responsible for massive performance degradation for those
>> who used only CONFIG_SECURITY_APPARMOR.
>>
>> And the numbers are, take the following test for instance:
>>
>> dd if=/dev/zero of=/dev/null count=2M
>>
>> ARM64:      500MB/s -> 350MB/s
>> ARM:        400MB/s -> 300MB/s
> Hi there.
> 
> Out of curiosity, what kernel/distribution are you running, or is this
> a custom kernel compile?  Can you also share the output of 'auditctl

This test was carried out with Linux 4.9. Custom built.

> -l' from your system?  The general approach taken by everyone to
> turn-off the per-syscall audit overhead is to add the "-a never,task"
> rule to their audit configuration:
> 
>  # auditctl -a never,task
> 
> If you are using Fedora/CentOS/RHEL, or a similarly configured system,

This is an embedded distribution. We are not using auditctl or any other
audit-related user-space packages.

> you can find this configuration in the /etc/audit/audit.rules file (be
> warned, that file is automatically generated based on
> /etc/audit/rules.d).

I suppose in this case rule list must be empty. Is there a way to check
this without extra user-space packages?

-- 
Best regards,
Alexander Sverdlin.