linux-kernel - Re: [RFC PATCH 0/3] move the secure

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Message-ID: <CAB=4xhp3WYoD6RnY+Y=XV18RiCLOeT-dsDmHxAVUYpaSUMpZdA@mail.gmail.com>
Date:	Thu, 24 May 2012 11:07:31 -0700
From:	Roland McGrath <mcgrathr@...gle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Will Drewry <wad@...omium.org>, linux-kernel@...r.kernel.org,
	indan@....nu, netdev@...isplace.org,
	linux-security-module@...r.kernel.org,
	kernel-hardening@...ts.openwall.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	tglx@...utronix.de, luto@....edu, serge.hallyn@...onical.com,
	pmoore@...hat.com, akpm@...ux-foundation.org, corbet@....net,
	markus@...omium.org, coreyb@...ux.vnet.ibm.com,
	keescook@...omium.org, viro@...iv.linux.org.uk, jmorris@...ei.org
Subject: Re: [RFC PATCH 0/3] move the secure_computing call

On Thu, May 24, 2012 at 9:13 AM, H. Peter Anvin <hpa@...or.com> wrote:
> I think this really screws with using seccomp for self-interception.  I
> wouldn't inherently be opposed to the following flow:
>
>        seccomp -> ptrace -> seccomp
>
> ... i.e. if ptrace is enabled and we enable something, run it through
> seccomp again, but there are bunch of use cases (mostly involving
> SIGSYS) where doing ptrace before seccomp is just bizarre.

Are you sure?  This is ptrace syscall tracing going first.
If seccomp generates a SIGSYS, then ptrace will still get its opportunity
to intercept the signal and change the register state however it likes.


Thanks,
Roland
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