From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Sat, 4 Jun 2005 22:43:30 +0000 (-0700)
Subject: [PATCH] s390: ptrace peek and poke
X-Git-Tag: v2.6.12-rc6~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=778959db97c7ed8eed4025916916b17a4629ce3d;p=pandora-kernel.git

[PATCH] s390: ptrace peek and poke

The special cases of peek and poke on acrs[15] and the fpc register are not
handled correctly.  A poke on acrs[15] will clobber the 4 bytes after the
access registers in the thread_info structure.  That happens to be the kernel
stack pointer.  A poke on the fpc with an invalid value is not caught by the
validity check.  On the next context switch the broken fpc value will cause a
program check in the kernel.  Improving the checks in peek and poke fixes
this.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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