This is a note to let you know that I've just added the patch titled
x86/ldt: Correct LDT access in single stepping logic
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-correct-ldt-access-in-single-stepping-logic.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 <[email protected]> know about it.
>From 136d9d83c07c5e30ac49fc83b27e8c4842f108fc Mon Sep 17 00:00:00 2001
From: Juergen Gross <[email protected]>
Date: Thu, 6 Aug 2015 10:04:38 +0200
Subject: x86/ldt: Correct LDT access in single stepping logic
From: Juergen Gross <[email protected]>
commit 136d9d83c07c5e30ac49fc83b27e8c4842f108fc upstream.
Commit 37868fe113ff ("x86/ldt: Make modify_ldt synchronous")
introduced a new struct ldt_struct anchored at mm->context.ldt.
convert_ip_to_linear() was changed to reflect this, but indexing
into the ldt has to be changed as the pointer is no longer void *.
Signed-off-by: Juergen Gross <[email protected]>
Reviewed-by: Andy Lutomirski <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kernel/step.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/kernel/step.c
+++ b/arch/x86/kernel/step.c
@@ -28,11 +28,11 @@ unsigned long convert_ip_to_linear(struc
struct desc_struct *desc;
unsigned long base;
- seg &= ~7UL;
+ seg >>= 3;
mutex_lock(&child->mm->context.lock);
if (unlikely(!child->mm->context.ldt ||
- (seg >> 3) >= child->mm->context.ldt->size))
+ seg >= child->mm->context.ldt->size))
addr = -1L; /* bogus selector, access would fault */
else {
desc = &child->mm->context.ldt->entries[seg];
Patches currently in stable-queue which might be from [email protected] 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-further-fix-fpu-emulation.patch
--
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