linux-kernel - Re: [PATCH v2 3/4] x86, head

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

Message-ID: <20110517021006.GA6732@srcf.ucam.org>
Date:	Tue, 17 May 2011 03:10:06 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>,
	Asit K Mallick <asit.k.mallick@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] x86, head_32/64.S: Enable SMEP

On Mon, May 16, 2011 at 02:34:44PM -0700, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 
> Enable newly documented SMEP (Supervisor Mode Execution Protection) CPU
> feature in kernel.
> 
> SMEP prevents the CPU in kernel-mode to jump to an executable page that does
> not have the kernel/system flag set in the pte. This prevents the kernel
> from executing user-space code accidentally or maliciously, so it for example
> prevents kernel exploits from jumping to specially prepared user-mode shell
> code. The violation will cause page fault #PF and will have error code
> identical to XD violation.

Are EFI runtime service pages currently set up appropriately?

-- 
Matthew Garrett | mjg59@...f.ucam.org
--
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/