From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Fri, 22 Dec 2006 09:11:21 +0000 (-0800)
Subject: [PATCH] ptrace: Fix EFL_OFFSET value according to i386 pda changes
X-Git-Tag: v2.6.20-rc2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8701ea957dd2a7c309e17c8dcde3a64b92d8aec0;p=pandora-kernel.git

[PATCH] ptrace: Fix EFL_OFFSET value according to i386 pda changes

The PDA patches introduced a bug in ptrace: it reads eflags from the wrong
place on the target's stack, but writes it back to the correct place.  The
result is a corrupted eflags, which is most visible when it turns interrupts
off unexpectedly.

This patch fixes this by making the ptrace code a little less fragile.  It
changes [gs]et_stack_long to take a straightforward byte offset into struct
pt_regs, rather than requiring all callers to do a sizeof(struct pt_regs)
offset adjustment.  This means that the eflag's offset (EFL_OFFSET) on the
target stack can be simply computed with offsetof().

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Frederik Deweerdt <deweerdt@free.fr>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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