patch-2.4.0-test11 linux/arch/i386/kernel/i387.c

• Lines: 9
• Date: Fri Nov 3 09:47:48 2000
• Orig file: v2.4.0-test10/linux/arch/i386/kernel/i387.c
• Orig date: Tue Oct 31 12:42:26 2000

diff -u --recursive --new-file v2.4.0-test10/linux/arch/i386/kernel/i387.c linux/arch/i386/kernel/i387.c
@@ -442,6 +442,8 @@
 	if ( HAVE_FXSR ) {
 		__copy_from_user( &tsk->thread.i387.fxsave, (void *)buf,
 				  sizeof(struct user_fxsr_struct) );
+		/* mxcsr bit 6 and 31-16 must be zero for security reasons */
+		tsk->thread.i387.fxsave.mxcsr &= 0xffbf;
 		return 0;
 	} else {
 		return -EIO;