linux-kernel - Re: [PATCH v6 2/2] arm64: audit: Add audit hook in ptrace/syscall

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Date:	Wed, 5 Mar 2014 21:55:11 -0500
From:	Richard Guy Briggs <rgb@...hat.com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	Will Deacon <will.deacon@....com>, viro@...iv.linux.org.uk,
	eparis@...hat.com, Catalin.Marinas@....com, dsaxena@...aro.org,
	arndb@...db.de, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-audit@...hat.com
Subject: Re: [PATCH v6 2/2] arm64: audit: Add audit hook in
 ptrace/syscall_trace

On 14/03/06, AKASHI Takahiro wrote:
> On 03/01/2014 01:15 AM, Will Deacon wrote:
> >On Fri, Feb 28, 2014 at 05:17:15AM +0000, AKASHI Takahiro wrote:
> >>This patch adds auditing functions on entry to or exit from
> >>every system call invocation.
> >>
> >>Acked-by: Richard Guy Briggs <rgb@...hat.com>
> >>Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> >>---
> >>  arch/arm64/kernel/ptrace.c |   54 ++++++++++++++++++++++++++------------------
> >>  1 file changed, 32 insertions(+), 22 deletions(-)
> >
> >I think you need to do something like I did for arch/arm/, where we have
> >separate trace functions for entry/exit  to make sure that we invoke the
> >various helpers in the correct order (for example, you want to invoke all
> >the debug stuff *first* on entry, but *last* on exit).
> >
> >Will
> 
> If you mean syscall_trace_enter()/exit(), I will follow your suggestion
> for readability.

It isn't so much a question of readability, but rather correctness,
undoing operations in the opposite order on exit that they were done on
entry.

> -Takahiro AKASHI

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
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