linux-kernel - Re: [GIT pull] x86 mpx support for 3.19

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]

Date:	Fri, 12 Dec 2014 13:30:48 +0100
From:	Pavel Machek <pavel@....cz>
To:	Dave Hansen <dave.hansen@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [GIT pull] x86 mpx support for 3.19


> +config X86_INTEL_MPX
> +	prompt "Intel MPX (Memory Protection Extensions)"
> +	def_bool y

bool?

> +	depends on CPU_SUP_INTEL
> +	---help---
> +	  MPX provides hardware features that can be used in
> +	  conjunction with compiler-instrumented code to check
> +	  memory references.  It is designed to detect buffer
> +	  overflow or underflow bugs.
> +
> +	  This option enables running applications which are
> +	  instrumented or otherwise use MPX.  It does not use MPX
> +	  itself inside the kernel or to protect the kernel
> +	  against bad memory references.
> +
> +	  Enabling this option will make the kernel larger:
> +	  ~8k of kernel text and 36 bytes of data on a 64-bit
> +	  defconfig.  It adds a long to the 'mm_struct' which
> +	  will increase the kernel memory overhead of each
> +	  process and adds some branches to paths used during
> +	  exec() and munmap().

Should you explain what kind of CPUs support it? Basically "the kind
you don't have, yet"?

> +	  If unsure, say Y.

Disagreed here. Right now, N is right response to anyone but Intel.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
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/