740fd64d65
address, writting non-canonical address can cause kernel a panic, by restricting base values to 0..VM_MAXUSER_ADDRESS, ensuring only canonical values get written to the registers. Reviewed by: peter, Josepha Koshy < joseph.koshy at gmail dot com > Approved by: re (scottl)
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/*-
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* Copyright (c) 2003 Peter Wemm.
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <sys/sysproto.h>
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#include <machine/specialreg.h>
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#include <machine/sysarch.h>
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#include <machine/pcb.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/vmparam.h>
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#ifndef _SYS_SYSPROTO_H_
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struct sysarch_args {
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int op;
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char *parms;
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};
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#endif
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int
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sysarch(td, uap)
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struct thread *td;
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register struct sysarch_args *uap;
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{
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int error = 0;
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struct pcb *pcb = curthread->td_pcb;
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uint32_t i386base;
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uint64_t a64base;
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switch(uap->op) {
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case I386_GET_FSBASE:
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i386base = pcb->pcb_fsbase;
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error = copyout(&i386base, uap->parms, sizeof(i386base));
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break;
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case I386_SET_FSBASE:
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error = copyin(uap->parms, &i386base, sizeof(i386base));
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if (!error) {
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critical_enter();
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wrmsr(MSR_FSBASE, i386base);
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pcb->pcb_fsbase = i386base;
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critical_exit();
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}
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break;
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case I386_GET_GSBASE:
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i386base = pcb->pcb_gsbase;
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error = copyout(&i386base, uap->parms, sizeof(i386base));
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break;
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case I386_SET_GSBASE:
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error = copyin(uap->parms, &i386base, sizeof(i386base));
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if (!error) {
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critical_enter();
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wrmsr(MSR_KGSBASE, i386base);
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pcb->pcb_gsbase = i386base;
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critical_exit();
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}
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break;
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case AMD64_GET_FSBASE:
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error = copyout(&pcb->pcb_fsbase, uap->parms, sizeof(pcb->pcb_fsbase));
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break;
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case AMD64_SET_FSBASE:
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error = copyin(uap->parms, &a64base, sizeof(a64base));
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if (!error) {
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if (a64base < VM_MAXUSER_ADDRESS) {
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critical_enter();
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wrmsr(MSR_FSBASE, a64base);
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pcb->pcb_fsbase = a64base;
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critical_exit();
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} else {
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error = EINVAL;
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}
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}
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break;
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case AMD64_GET_GSBASE:
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error = copyout(&pcb->pcb_gsbase, uap->parms, sizeof(pcb->pcb_gsbase));
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break;
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case AMD64_SET_GSBASE:
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error = copyin(uap->parms, &a64base, sizeof(a64base));
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if (!error) {
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if (a64base < VM_MAXUSER_ADDRESS) {
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critical_enter();
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wrmsr(MSR_KGSBASE, a64base);
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pcb->pcb_gsbase = a64base;
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critical_exit();
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} else {
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error = EINVAL;
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}
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}
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break;
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default:
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error = EINVAL;
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break;
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}
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return (error);
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}
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