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 PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 10 Nov 2009 10:53:33 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Kees Cook <kees.cook@...onical.com> CC: Arjan van de Ven <arjan@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, x86@...nel.org, Pekka Enberg <penberg@...helsinki.fi>, Jan Beulich <jbeulich@...ell.com>, Vegard Nossum <vegardno@....uio.no>, Yinghai Lu <yinghai@...nel.org>, Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH v4] [x86] detect and report lack of NX protections On 11/10/2009 09:46 AM, Kees Cook wrote: > > The kernel as-is does not set nx_enabled for 64-bit, so this message is > skipped completely: > > if (nx_enabled) > printk(KERN_INFO "NX (Execute Disable) protection: active\n"); > > The only time this printk is shown is on 32-bit with PAE (with NX). > There is no "else" currently. > The structure you have is: if (nx_enabled) else if (cpu_has_pae) The test for cpu_has_pae is unconditional (you only #ifdef the message) -- in fact, this should cause a compile-time error on 64 bits: #undef cpu_has_pae #define cpu_has_pae ___BUG___ -hpa -- 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/
Powered by blists - more mailing lists