linux-kernel - [patch] espfix cleanup take 2

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

Date:	Wed, 02 Aug 2006 20:43:47 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	Zachary Amsden <zach@...are.com>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: [patch] espfix cleanup take 2

Hi Andrew.

Attached is a new espfix cleanup patch.
- Introduced PER_CPU() macro to be used from asm
- Introduced GET_DESC_BASE() macro to be used from asm
- Rewrote the fixup code in asm, as calling a C code with
the altered %ss appeared to be unsafe
- No longer altering the stack from a .fixup section
- 16bit per-cpu stack is no longer used, instead the 32bit
stack is used, and the base is patched the way so that the
high word of the kernel and user %esp are the same.
- I think that the limit of regs->esp+THREAD_SIZE*2 is very
permissive too (and I don't want to mess with granularity),
so I left the default 4G limit, unless Zach will really
complain on that. :)

Signed-off-by: Stas Sergeev <stsp@...et.ru>
Acked-by: Zachary Amsden <zach@...are.com>


View attachment "espfcln2.diff" of type "text/x-patch" (11222 bytes)