linux-kernel - [PATCH] x86: correct fpu emulation access to ldt

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Date:	Tue,  4 Aug 2015 17:02:40 +0200
From:	Juergen Gross <jgross@...e.com>
To:	billm@...bpc.org.au, luto@...capital.net,
	linux-kernel@...r.kernel.org
Cc:	Juergen Gross <jgross@...e.com>
Subject: [PATCH] x86: correct fpu emulation access to ldt

Commit 14805442532c ("x86/ldt: Make modify_ldt synchronous") introduced
a new struct ldt_struct anchored at mm->context.ldt.

Adapt the x86 fpu emulation to use that new structure.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/math-emu/fpu_entry.c   | 1 +
 arch/x86/math-emu/fpu_system.h  | 2 +-
 arch/x86/math-emu/get_address.c | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index f37e84a..97820c24 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -30,6 +30,7 @@
 #include <asm/uaccess.h>
 #include <asm/traps.h>
 #include <asm/desc.h>
+#include <asm/mmu_context.h>
 #include <asm/user.h>
 #include <asm/fpu/internal.h>
 
diff --git a/arch/x86/math-emu/fpu_system.h b/arch/x86/math-emu/fpu_system.h
index 9ccecb6..7c7af3a 100644
--- a/arch/x86/math-emu/fpu_system.h
+++ b/arch/x86/math-emu/fpu_system.h
@@ -18,7 +18,7 @@
 
 /* s is always from a cpu register, and the cpu does bounds checking
  * during register load --> no further bounds checks needed */
-#define LDT_DESCRIPTOR(s)	(((struct desc_struct *)current->mm->context.ldt)[(s) >> 3])
+#define LDT_DESCRIPTOR(s)	(current->mm->context.ldt->entries[(s) >> 3])
 #define SEG_D_SIZE(x)		((x).b & (3 << 21))
 #define SEG_G_BIT(x)		((x).b & (1 << 23))
 #define SEG_GRANULARITY(x)	(((x).b & (1 << 23)) ? 4096 : 1)
diff --git a/arch/x86/math-emu/get_address.c b/arch/x86/math-emu/get_address.c
index 6ef5e99..4f83d09 100644
--- a/arch/x86/math-emu/get_address.c
+++ b/arch/x86/math-emu/get_address.c
@@ -21,6 +21,7 @@
 
 #include <asm/uaccess.h>
 #include <asm/desc.h>
+#include <asm/mmu_context.h>
 
 #include "fpu_system.h"
 #include "exception.h"
-- 
2.1.4

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