linux-kernel - Re: [PATCH 4/5] x86: Use generic compat audit code

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Date:	Wed, 4 Mar 2015 01:39:44 -0500
From:	Brian Gerst <brgerst@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, drysdale@...gle.com
Subject: Re: [PATCH 4/5] x86: Use generic compat audit code

On Wed, Mar 4, 2015 at 12:14 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Brian Gerst <brgerst@...il.com> wrote:
>
>> Use the generic compat syscall audit code instead of an x86 specific
>> implementation.
>>
>> Signed-off-by: Brian Gerst <brgerst@...il.com>
>> ---
>>  arch/x86/Kconfig                |  5 +--
>>  arch/x86/ia32/Makefile          |  3 --
>>  arch/x86/ia32/audit.c           | 43 ---------------------
>>  arch/x86/include/asm/unistd32.h |  2 +
>>  arch/x86/kernel/Makefile        |  2 -
>>  arch/x86/kernel/audit_64.c      | 82 -----------------------------------------
>>  6 files changed, 3 insertions(+), 134 deletions(-)
>>  delete mode 100644 arch/x86/ia32/audit.c
>>  create mode 100644 arch/x86/include/asm/unistd32.h
>>  delete mode 100644 arch/x86/kernel/audit_64.c
>
> Nice!
>
> Because there are many types of conversions it would be nice if the
> changelog included a declaration of some sorts about what this means
> precisely: 'the two implementations were 100% identical', or 'the x86
> one was buggy and we now switch to the correct generic one', or 'the
> only difference between the two is X, Y and Z, which is not a
> problem'?
>
> Thanks,
>
>         Ingo

The generic compat version was added along with the arm64 support.  It
is functionally equivalent to the x86-specific implementation.  The
main difference is using audit_is_compat() instead of a hardcoded
check for AUDIT_ARCH_I386.

I just noticed a bug in lib/compat_audit.c though.  It is missing __NR_execveat.

--
Brian Gerst
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