Patch "x86/ldt: Further fix FPU emulation" has been added to the 4.1-stable tree

Patch "x86/ldt: Further fix FPU emulation" has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    x86/ldt: Further fix FPU emulation

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     x86-ldt-further-fix-fpu-emulation.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 12e244f4b550498bbaf654a52f93633f7dde2dc7 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@kernel.org>
Date: Fri, 14 Aug 2015 15:02:55 -0700
Subject: x86/ldt: Further fix FPU emulation

From: Andy Lutomirski <luto@kernel.org>

commit 12e244f4b550498bbaf654a52f93633f7dde2dc7 upstream.

The previous fix confused a selector with a segment prefix.  Fix it.

Compile-tested only.

Cc: Juergen Gross <jgross@suse.com>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes: 4809146b86c3 ("x86/ldt: Correct FPU emulation access to LDT")
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/math-emu/get_address.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/math-emu/get_address.c
+++ b/arch/x86/math-emu/get_address.c
@@ -157,7 +157,7 @@ static long pm_address(u_char FPU_modrm,
 		addr->selector = PM_REG_(segment);
 	}
 
-	descriptor = FPU_get_ldt_descriptor(segment);
+	descriptor = FPU_get_ldt_descriptor(addr->selector);
 	base_address = SEG_BASE_ADDR(descriptor);
 	address = base_address + offset;
 	limit = base_address


Patches currently in stable-queue which might be from luto@kernel.org are

queue-4.1/x86-ldt-correct-ldt-access-in-single-stepping-logic.patch
queue-4.1/x86-ldt-correct-fpu-emulation-access-to-ldt.patch
queue-4.1/x86-ldt-make-modify_ldt-synchronous.patch
queue-4.1/x86-ldt-further-fix-fpu-emulation.patch