7c5a46a1bc
In all practical situations, the resolver visibility is static. Requested by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Approved by: so (emaste) Differential revision: https://reviews.freebsd.org/D20281
139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*-
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* Copyright (c) 2019 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <machine/cpufunc.h>
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#include <machine/specialreg.h>
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#include <machine/sysarch.h>
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#include <x86/ifunc.h>
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#include <errno.h>
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#include <string.h>
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#define MAX_PKRU_IDX 0xf
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#ifdef __i386__
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#define X86_SET_PKRU I386_SET_PKRU
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#define X86_CLEAR_PKRU I386_CLEAR_PKRU
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#else
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#define X86_SET_PKRU AMD64_SET_PKRU
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#define X86_CLEAR_PKRU AMD64_CLEAR_PKRU
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#endif
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static int
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x86_pkru_get_perm_unsup(u_int keyidx, int *access, int *modify)
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{
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errno = EOPNOTSUPP;
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return (-1);
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}
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static int
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x86_pkru_get_perm_hw(u_int keyidx, int *access, int *modify)
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{
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uint32_t pkru;
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if (keyidx > MAX_PKRU_IDX) {
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errno = EINVAL;
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return (-1);
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}
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keyidx *= 2;
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pkru = rdpkru();
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*access = (pkru & (1 << keyidx)) == 0;
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*modify = (pkru & (2 << keyidx)) == 0;
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return (0);
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}
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DEFINE_UIFUNC(, int, x86_pkru_get_perm, (u_int, int *, int *))
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{
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return ((cpu_stdext_feature2 & CPUID_STDEXT2_OSPKE) == 0 ?
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x86_pkru_get_perm_unsup : x86_pkru_get_perm_hw);
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}
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static int
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x86_pkru_set_perm_unsup(u_int keyidx, int access, int modify)
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{
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errno = EOPNOTSUPP;
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return (-1);
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}
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static int
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x86_pkru_set_perm_hw(u_int keyidx, int access, int modify)
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{
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uint32_t pkru;
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if (keyidx > MAX_PKRU_IDX) {
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errno = EINVAL;
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return (-1);
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}
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keyidx *= 2;
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pkru = rdpkru();
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pkru &= ~(3 << keyidx);
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if (!access)
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pkru |= 1 << keyidx;
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if (!modify)
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pkru |= 2 << keyidx;
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wrpkru(pkru);
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return (0);
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}
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DEFINE_UIFUNC(, int, x86_pkru_set_perm, (u_int, int, int))
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{
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return ((cpu_stdext_feature2 & CPUID_STDEXT2_OSPKE) == 0 ?
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x86_pkru_set_perm_unsup : x86_pkru_set_perm_hw);
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}
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int
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x86_pkru_protect_range(void *addr, unsigned long len, u_int keyidx, int flags)
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{
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struct amd64_set_pkru a64pkru;
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memset(&a64pkru, 0, sizeof(a64pkru));
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a64pkru.addr = addr;
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a64pkru.len = len;
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a64pkru.keyidx = keyidx;
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a64pkru.flags = flags;
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return (sysarch(X86_SET_PKRU, &a64pkru));
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}
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int
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x86_pkru_unprotect_range(void *addr, unsigned long len)
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{
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struct amd64_set_pkru a64pkru;
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memset(&a64pkru, 0, sizeof(a64pkru));
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a64pkru.addr = addr;
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a64pkru.len = len;
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return (sysarch(X86_CLEAR_PKRU, &a64pkru));
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}
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