linux-kernel - Re: [PATCH]x86_64: build and use GDT on copied compressed kernel

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: <m1ejllqmo8.fsf@ebiederm.dsl.xmission.com>
Date:	Sun, 13 May 2007 00:09:59 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Andi Kleen" <ak@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Vivek Goyal" <vgoyal@...ibm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	yinghai.lu@....com
Subject: Re: [PATCH]x86_64: build and use GDT on copied compressed kernel

"Yinghai Lu" <yhlu.kernel@...il.com> writes:

> please check the patch.
>
> YH
>
> [PATCH]x86_64: build and use GDT on copied compressed kernel 
>
> Build and use GDT on copied compressed kernel postion, instead of using GDT 
> in data segment of loaded compressed kernel. Otherwise decompressing 
> compressed kernel image later in 64bit longmode, will overwrite GDT.

Overwriting the GDT should be fine because we don't reload the segments,
after we overwrite it.  GDT entries are only read when we load segments.
Interrupts are disabled so that should not cause a problem.

Why do you think the current behaviour is a problem?

Eric
-
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/