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 <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-12-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index d5dd808144190ffd1d443229b4dbbd56740fface..a9a4229f6161b25b6e8a5752be7943f478525d21 100644 (file)
--- 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;
 }