linux-kernel - Re: [RFC][PATCH] seccomp: add SECCOMP_RET

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Date:	Thu, 28 Jan 2016 19:03:57 -0800
From:	Jeffrey Vander Stoep <jeffv@...gle.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Kees Cook <keescook@...omium.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Will Drewry <wad@...omium.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	LSM List <linux-security-module@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>
Subject: Re: [RFC][PATCH] seccomp: add SECCOMP_RET_ACK for non-fatal SIGSYS

Thanks! This is just what I need.

What are the drawbacks to returning the sigsys before executing the
system call? Otherwise this loses the benefit of properly reporting
registers for argument inspection.

How about SECCOMP_RET_PERMISSIVE? Describes the application rather
than the implementation. Otherwise preference is for
SECCOMP_RET_ALLOW_SIGSYS.