[PATCH] uml: fix access_ok
commit7a590611c0f1e1302c58fdfdc958f2d6bdddd78a
authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Mon, 14 Nov 2005 00:07:13 +0000 (13 16:07 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Mon, 14 Nov 2005 02:14:15 +0000 (13 18:14 -0800)
treead57f5bda5245af1d03ba10e15308487b1aae9c7
parent55c033c1f6cdedc350c79c3198b542e3ab496899
[PATCH] uml: fix access_ok

The access_ok_tt() macro is bogus, in that a read access is unconditionally
considered valid.

I couldn't find in SCM logs the introduction of this check, but I went back to
2.4.20-1um and the definition was the same.

Possibly this was done to avoid problems with missing set_fs() calls, but
there can't be any I think because they would fail with SKAS mode.
TT-specific code is still to check.

Also, this patch joins common code together, and makes the "address range
wrapping" check happen for all cases, rather than for only some.

This may, possibly, be reoptimized at some time, but the current code doesn't
seem clever, just confused.

* Important: I've also had to change references to access_ok_{tt,skas} back to
  access_ok - the kernel wasn't that happy otherwise.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
arch/um/include/um_uaccess.h
arch/um/kernel/skas/include/uaccess-skas.h
arch/um/kernel/skas/uaccess.c
arch/um/kernel/tt/include/uaccess-tt.h
arch/um/kernel/tt/uaccess.c