linux-kernel - Re: [PATCH] audit: add arch field to seccomp event log

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Date:	Tue, 18 Feb 2014 16:01:54 -0500
From:	Steve Grubb <sgrubb@...hat.com>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	Eric Paris <eparis@...hat.com>, linux-audit@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] audit: add arch field to seccomp event log

On Tuesday, February 18, 2014 03:50:44 PM Richard Guy Briggs wrote:
> > missing '='   but this isn't what audit_get_context() does...   it's
> > crappy naming...    I'd think a combo of audit_dummy_context() and
> > current->audit_context would be most appropriate.
> 
> Ok.  I think I finally understand audit_dummy_context().  Thanks for the
> hint.  However, it appears it is not useful in this sitation, since if
> there is an audit_context, even a dummy context, it appears arch is
> filled in.
> 
> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> @@ -2406,12 +2406,18 @@ void audit_core_dumps(long signr)
>  void __audit_seccomp(unsigned long syscall, long signr, int code)
>  {
>         struct audit_buffer *ab;
> +       struct audit_context *context = current->audit_context;
>  
>         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
>         if (unlikely(!ab))
>                 return;
>         audit_log_task(ab);
>         audit_log_format(ab, " sig=%ld", signr);
> +       audit_log_format(ab, " arch=");
> +       if (context)
> +               audit_log_format(ab, "%x", context->arch);
> +       else
> +               audit_log_format(ab, "(null)");
>         audit_log_format(ab, " syscall=%ld", syscall);
>         audit_log_format(ab, " compat=%d", is_compat_task());
>         audit_log_format(ab, " ip=0x%lx", KSTK_EIP(current));

Is there anything that could be passed by the caller that might identify the 
syscall ABI when this call was blocked? '(null)' still makes syscall number 
uninterpretable.

-Steve
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