linux-kernel - Re: [PATCH 1/2] LSM: Do not apply mmap_min_addr check to PROT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20111028163736.AEF082C0EB@topped-with-meat.com>
Date:	Fri, 28 Oct 2011 09:37:36 -0700 (PDT)
From:	Roland McGrath <roland@...k.frob.com>
To:	Gregory Sahanovitch <gsahanovitch@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Morris <jmorris@...ei.org>,
	Eric Paris <eparis@...isplace.org>,
	Stephen Smalley <sds@...ho.nsa.gov>, selinux@...ho.nsa.gov,
	John Johansen <john.johansen@...onical.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] LSM: Do not apply mmap_min_addr check to PROT_NONE

> Since mmap_min_addr is used to prevent a *malicious* process from maping the
> zero page and then taking advantage of a user-pointer dereference in the
> *kernel code*, I do not see what you gain by guaranteeing that the
> application *that you control* would never exploit such a vulnerability?

The application does sandboxing of untrusted code.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/