netdev - Re: [PATCH v8 5/8] seccomp: Add SECCOMP_RET

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Message-ID: <CAE6n16nUB8eg18YHdYbSUqtZ_WJduk4B_dYqyYy37K+6di6yVw@mail.gmail.com>
Date:	Thu, 16 Feb 2012 12:28:25 -0800
From:	Markus Gutschke <markus@...omium.org>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.org,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, luto@....edu,
	eparis@...hat.com, serge.hallyn@...onical.com, djm@...drot.org,
	scarybeasts@...il.com, indan@....nu, pmoore@...hat.com,
	akpm@...ux-foundation.org, corbet@....net, eric.dumazet@...il.com,
	keescook@...omium.org
Subject: Re: [PATCH v8 5/8] seccomp: Add SECCOMP_RET_TRAP

On Thu, Feb 16, 2012 at 12:02, Will Drewry <wad@...omium.org> wrote:
> Adds a new return value to seccomp filters that triggers a SIGTRAP to be delivered with the new TRAP_SECCOMP si_code.
>
> This allows in-process system call emulation -- including just specifying an errno or cleanly dumping core -- rather than just dying.

SIGTRAP might not be the ideal choice of signal number, as it can make
it very difficult to debug the program in gdb. Other than that, I love
this feature. It'll significantly simplify the code that we have in
Chrome.


Markus
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