x86/xsaves: Clear reserved bits in xsave header

The reserved bits (128~511) in the xsave header must be zero according to X86 SDM. Clear the bits in this patch. Signed-off-by: Fenghua Yu <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: H. Peter Anvin <[email protected]>
vbatts · May 29, 2014 · 21e726c · 21e726c
1 parent facbf4d
commit 21e726c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
@@ -375,7 +375,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
 	/*
 	 * These bits must be zero.
 	 */
-	xsave_hdr->reserved1[0] = xsave_hdr->reserved1[1] = 0;
+	memset(xsave_hdr->reserved, 0, 48);
 
 	return ret;
 }