From: Will Deacon <will.deacon@arm.com>
Date: Tue, 21 Feb 2012 11:29:03 +0000 (+0100)
Subject: ARM: 7337/1: ptrace: fix ptrace_read_user for !CONFIG_MMU platforms
X-Git-Tag: v3.4-rc2~28^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5a4f5da543b169d555a19e889850780ddceb8f98;p=pandora-kernel.git

ARM: 7337/1: ptrace: fix ptrace_read_user for !CONFIG_MMU platforms

Commit 68b7f715 ("nommu: ptrace support") added definitions for
PT_TEXT_ADDR and friends, as well as adding ptrace support for reading
from these magic offsets.

Unfortunately, this has probably never worked, since ptrace_read_user
predicates reading on off < sizeof(struct user), returning -EIO
otherwise.

This patch moves the offset size check until after we have tried to
match it against either a magic value or an offset into pt_regs.

Cc: Paul Brook <paul@codesourcery.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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