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

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Message-ID: <CAHse=S9YTdkDMEqUhTYBJ84VSYG9B_6-BPMmv_Eh-zL=sfegeQ@mail.gmail.com>
Date:	Wed, 4 Mar 2015 14:52:24 +0000
From:	David Drysdale <drysdale@...gle.com>
To:	Brian Gerst <brgerst@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 4/5] x86: Use generic compat audit code

On Wed, Mar 4, 2015 at 6:39 AM, Brian Gerst <brgerst@...il.com> wrote:
>
> 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.

Sorry I missed that.  I'll send a patch (and cc: stable for 3.19).

> --
> Brian Gerst
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