linux-kernel - Re: x32 + audit status?

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Date:	Thu, 5 Mar 2015 15:07:46 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	David Drysdale <drysdale@...gle.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Moore <paul@...l-moore.com>, linux-audit@...hat.com,
	Kees Cook <keescook@...omium.org>,
	Eric Paris <eparis@...hat.com>
Subject: Re: x32 + audit status?

On Mar 5, 2015 10:32 AM, "David Drysdale" <drysdale@...gle.com> wrote:
>
> Hi,
>
> Do we currently expect the audit system to work with x32 syscalls?
>
> I was playing with the audit system for the first time today (on
> v4.0-rc2, due to [1]), and it didn't seem to work for me.  (Tweaking
> ptrace.c like the patch below seemed to help, but I may just have
> configured something wrong.)
>
> I know there was a bunch of activity around this area in mid-2014,
> but I'm not sure what the final position was...

It's totally broken, and it needs ABI work.  I think it should keep
the high syscall numbers, which means that both userspace and the
audit core need to learn how to deal with it.

--Andy

>
> Thanks,
> David
>
> [1]: https://lkml.org/lkml/2015/3/4/879
>
> diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
> index e510618b2e91..443932afd9e8 100644
> --- a/arch/x86/kernel/ptrace.c
> +++ b/arch/x86/kernel/ptrace.c
> @@ -1445,7 +1445,7 @@ static void do_audit_syscall_entry(struct
> pt_regs *regs, u32 arch)
>  {
>  #ifdef CONFIG_X86_64
>         if (arch == AUDIT_ARCH_X86_64) {
> -               audit_syscall_entry(regs->orig_ax, regs->di,
> +               audit_syscall_entry(regs->orig_ax & __SYSCALL_MASK, regs->di,
>                                     regs->si, regs->dx, regs->r10);
>         } else
>  #endif
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