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Message-ID: <alpine.LRH.2.02.1205250932270.26644@tundra.namei.org> Date: Fri, 25 May 2012 09:40:18 +1000 (EST) From: James Morris <jmorris@...ei.org> To: Will Drewry <wad@...omium.org> cc: linux-kernel@...r.kernel.org, mcgrathr@...gle.com, hpa@...or.com, 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 Subject: Re: [RFC PATCH 0/3] move the secure_computing call On Thu, 24 May 2012, Will Drewry wrote: > As is, the biggest benefit of this change is just setting consistent > expectations in what the ptrace/seccomp interactions should be. The > current ability for ptrace to "bypass" secure computing (by remapping > allowed system calls) is not necessarily a problem, but it is not > necessarily intuitive behavior. Indeed -- while the purpose of seccomp is to reduce the attack surface of the syscall interface, if a user allows ptrace, attackers will definitely see that as an attack vector, if it allows them to increase that attack surface. It at least needs to be well-documented. -- James Morris <jmorris@...ei.org>
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