1 /*- 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * 4 * This software was developed by Andrew Turner under 5 * sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/proc.h> 33 #include <sys/sysproto.h> 34 35 #include <vm/vm.h> 36 #include <vm/pmap.h> 37 #include <vm/vm_map.h> 38 39 #include <machine/sysarch.h> 40 #include <machine/vmparam.h> 41 42 int 43 sysarch(struct thread *td, struct sysarch_args *uap) 44 { 45 struct arm64_guard_page_args gp_args; 46 vm_offset_t eva; 47 int error; 48 49 switch (uap->op) { 50 case ARM64_GUARD_PAGE: 51 error = copyin(uap->parms, &gp_args, sizeof(gp_args)); 52 if (error != 0) 53 return (error); 54 55 /* Only accept canonical addresses, no PAC or TBI */ 56 if (!ADDR_IS_CANONICAL(gp_args.addr)) 57 return (EINVAL); 58 59 eva = gp_args.addr + gp_args.len; 60 61 /* Check for a length overflow */ 62 if (gp_args.addr > eva) 63 return (EINVAL); 64 65 /* Check in the correct address space */ 66 if (eva >= VM_MAX_USER_ADDRESS) 67 return (EINVAL); 68 69 /* Nothing to do */ 70 if (gp_args.len == 0) 71 return (0); 72 73 error = pmap_bti_set(vmspace_pmap(td->td_proc->p_vmspace), 74 trunc_page(gp_args.addr), round_page(eva)); 75 break; 76 default: 77 error = EINVAL; 78 break; 79 } 80 81 return (error); 82 } 83