linux-kernel - Re: The 3G (or nG) Kernel Memory Space Offset

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:	Tue, 29 Aug 2006 09:44:41 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Dong Feng <middle.fengdong@...il.com>, Andi Kleen <ak@...e.de>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Paul Mackerras <paulus@...ba.org>,
	Christoph Lameter <clameter@....com>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: The 3G (or nG) Kernel Memory Space Offset

Jan Engelhardt wrote:
> Since it's all just virtual addresses, is the TLB flush really that much 
> different when kernelspace runs from (virtual) 0x00000000-0x3FFFFFFF rather 
> than (virtual)0xC000000-0xFFFFFFFF?
>   

If kernel and userspace are disjoint, they can be in the same address 
space, so there's no need for a TLB flush at all.

    J
-
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/