Patch "Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"" has been added to the 3.15-stable tree

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

    Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"

to the 3.15-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:
     revert-x86-64-modify_ldt-make-support-for-16-bit-segments-a-runtime-option.patch
and it can be found in the queue-3.15 subdirectory.

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


>From 7ed6fb9b5a5510e4ef78ab27419184741169978a Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@xxxxxxxxx>
Date: Wed, 21 May 2014 10:22:59 -0700
Subject: Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"

From: "H. Peter Anvin" <hpa@xxxxxxxxx>

commit 7ed6fb9b5a5510e4ef78ab27419184741169978a upstream.

This reverts commit fa81511bb0bbb2b1aace3695ce869da9762624ff in
preparation of merging in the proper fix (espfix64).

Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/kernel/ldt.c        |    4 +---
 arch/x86/vdso/vdso32-setup.c |    8 --------
 2 files changed, 1 insertion(+), 11 deletions(-)

--- a/arch/x86/kernel/ldt.c
+++ b/arch/x86/kernel/ldt.c
@@ -20,8 +20,6 @@
 #include <asm/mmu_context.h>
 #include <asm/syscalls.h>
 
-int sysctl_ldt16 = 0;
-
 #ifdef CONFIG_SMP
 static void flush_ldt(void *current_mm)
 {
@@ -236,7 +234,7 @@ static int write_ldt(void __user *ptr, u
 	 * IRET leaking the high bits of the kernel stack address.
 	 */
 #ifdef CONFIG_X86_64
-	if (!ldt_info.seg_32bit && !sysctl_ldt16) {
+	if (!ldt_info.seg_32bit) {
 		error = -EINVAL;
 		goto out_unlock;
 	}
--- a/arch/x86/vdso/vdso32-setup.c
+++ b/arch/x86/vdso/vdso32-setup.c
@@ -39,7 +39,6 @@
 #ifdef CONFIG_X86_64
 #define vdso_enabled			sysctl_vsyscall32
 #define arch_setup_additional_pages	syscall32_setup_pages
-extern int sysctl_ldt16;
 #endif
 
 /*
@@ -250,13 +249,6 @@ static struct ctl_table abi_table2[] = {
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
-	},
-	{
-		.procname	= "ldt16",
-		.data		= &sysctl_ldt16,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
 	},
 	{}
 };


Patches currently in stable-queue which might be from hpa@xxxxxxxxx are

queue-3.15/x86-espfix-make-it-possible-to-disable-16-bit-support.patch
queue-3.15/revert-x86-64-modify_ldt-make-support-for-16-bit-segments-a-runtime-option.patch
queue-3.15/x86-espfix-make-espfix64-a-kconfig-option-fix-uml.patch
--
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