* [PATCH] x86/ldt: Further fix FPU emulation
@ 2015-08-14 22:02 Andy Lutomirski
0 siblings, 0 replies; only message in thread
From: Andy Lutomirski @ 2015-08-14 22:02 UTC (permalink / raw)
To: Linus Torvalds
Cc: Ingo Molnar, Juergen Gross, Linux Kernel Mailing List,
Thomas Gleixner, H. Peter Anvin, Peter Zijlstra, Brian Gerst,
Denys Vlasenko, Andrew Morton, Andy Lutomirski, stable
The previous fix confused a selector with a segment prefix. Fix it.
Compile-tested only.
Cc: stable@vger.kernel.org
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>
---
Like this? Applies on top of x86/urgent.
arch/x86/math-emu/get_address.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/math-emu/get_address.c b/arch/x86/math-emu/get_address.c
index d13cab2aec45..8300db71c2a6 100644
--- 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, u_char segment,
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
--
2.4.3
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