ARM: 7337/1: ptrace: fix ptrace_read_user for !CONFIG_MMU platforms
authorWill Deacon <will.deacon@arm.com>
Tue, 21 Feb 2012 11:29:03 +0000 (12:29 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Fri, 30 Mar 2012 11:17:33 +0000 (12:17 +0100)
commit5a4f5da543b169d555a19e889850780ddceb8f98
tree802459fee3ff4855a99a68145fe0a9f7c5b8782a
parentfa0d1dbf7fb6b6f1af85d298a4054fe9edc914c9
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>
arch/arm/kernel/ptrace.c