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

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Date:   Mon, 28 Jan 2019 08:34:35 +0000
From:   "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
To:     Paul Moore <pmoore@...hat.com>,
        "linux-audit@...hat.com" <linux-audit@...hat.com>,
        Richard Guy Briggs <rbriggs@...hat.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        "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 08/12/2015 17:42, Paul Moore wrote:
> To the best of our knowledge, everyone who enables audit at compile
> 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

(with some particular CPU frequencies).

Should we revert this patch?

> ---
>  init/Kconfig |   11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> 
> --
> Linux-audit mailing list
> Linux-audit@...hat.com
> https://www.redhat.com/mailman/listinfo/linux-audit
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index c24b6f7..d4663b1 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -299,20 +299,15 @@ config AUDIT
>  	help
>  	  Enable auditing infrastructure that can be used with another
>  	  kernel subsystem, such as SELinux (which requires this for
> -	  logging of avc messages output).  Does not do system-call
> -	  auditing without CONFIG_AUDITSYSCALL.
> +	  logging of avc messages output).  System call auditing is included
> +	  on architectures which support it.
>  
>  config HAVE_ARCH_AUDITSYSCALL
>  	bool
>  
>  config AUDITSYSCALL
> -	bool "Enable system-call auditing support"
> +	def_bool y
>  	depends on AUDIT && HAVE_ARCH_AUDITSYSCALL
> -	default y if SECURITY_SELINUX
> -	help
> -	  Enable low-overhead system-call auditing infrastructure that
> -	  can be used independently or with another kernel subsystem,
> -	  such as SELinux.
>  
>  config AUDIT_WATCH
>  	def_bool y
> 

-- 
Best regards,
Alexander Sverdlin.

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