linux-kernel - [PATCH 3.2 026/107] x86/ldt: Further fix FPU emulation

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Message-ID: <lsq.1444349547.153555011@decadent.org.uk>
Date:	Fri, 09 Oct 2015 01:12:27 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Juergen Gross" <jgross@...e.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andy Lutomirski" <luto@...nel.org>
Subject: [PATCH 3.2 026/107] x86/ldt: Further fix FPU emulation

3.2.72-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Andy Lutomirski <luto@...nel.org>

commit 12e244f4b550498bbaf654a52f93633f7dde2dc7 upstream.

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

Compile-tested only.

Cc: Juergen Gross <jgross@...e.com>
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Fixes: 4809146b86c3 ("x86/ldt: Correct FPU emulation access to LDT")
Signed-off-by: Andy Lutomirski <luto@...nel.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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

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