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Pull up following revision(s) (requested by maxv in ticket #1540): 

sys/arch/x86/x86/fpu.c: 1.19 via patch
Mask mxcsr, otherwise userland could set reserved bits to 1 and make
xrstor fault.
This commit is contained in:
snj 2017-12-12 09:12:50 +00:00
parent f908e76645
commit ea1424d700
1 changed files with 3 additions and 2 deletions
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5
sys/arch/x86/x86/fpu.c
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@ -1,4 +1,4 @@
/* $NetBSD: fpu.c,v 1.9 2014/02/25 22:16:52 dsl Exp $ */
/* $NetBSD: fpu.c,v 1.9.12.1 2017/12/12 09:12:50 snj Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc. All
@ -100,7 +100,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fpu.c,v 1.9 2014/02/25 22:16:52 dsl Exp $");
__KERNEL_RCSID(0, "$NetBSD: fpu.c,v 1.9.12.1 2017/12/12 09:12:50 snj Exp $");
#include "opt_multiprocessor.h"
@ -617,6 +617,7 @@ process_write_fpregs_xmm(struct lwp *lwp, const struct fxsave *fpregs)
sizeof fpu_save->sv_xmm);
/* Invalid bits in the mxcsr_mask will cause faults */
fpu_save->sv_xmm.fx_mxcsr_mask &= __INITIAL_MXCSR_MASK__;
fpu_save->sv_xmm.fx_mxcsr &= fpu_save->sv_xmm.fx_mxcsr_mask;
} else {
process_xmm_to_s87(fpregs, &fpu_save->sv_87);
}