| 1 | /* $NetBSD: pax.h,v 1.25 2016/09/03 12:20:58 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2006 Elad Efrat <elad@NetBSD.org> |
| 5 | * All rights reserved. |
| 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 | * 3. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #ifndef _SYS_PAX_H_ |
| 31 | #define _SYS_PAX_H_ |
| 32 | |
| 33 | #include <uvm/uvm_extern.h> |
| 34 | |
| 35 | #define P_PAX_ASLR 0x01 /* Enable ASLR */ |
| 36 | #define P_PAX_MPROTECT 0x02 /* Enable Mprotect */ |
| 37 | #define P_PAX_GUARD 0x04 /* Enable Segvguard */ |
| 38 | |
| 39 | struct lwp; |
| 40 | struct proc; |
| 41 | struct exec_package; |
| 42 | struct vmspace; |
| 43 | |
| 44 | #ifdef PAX_ASLR |
| 45 | /* |
| 46 | * We stick this here because we need it in kern/exec_elf.c for now. |
| 47 | */ |
| 48 | #ifndef PAX_ASLR_DELTA_EXEC_LEN |
| 49 | #define PAX_ASLR_DELTA_EXEC_LEN 12 |
| 50 | #endif |
| 51 | #endif /* PAX_ASLR */ |
| 52 | #ifdef PAX_ASLR_DEBUG |
| 53 | extern int pax_aslr_debug; |
| 54 | #endif |
| 55 | |
| 56 | #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) || defined(PAX_ASLR) |
| 57 | void pax_init(void); |
| 58 | void pax_set_flags(struct exec_package *, struct proc *); |
| 59 | void pax_setup_elf_flags(struct exec_package *, uint32_t); |
| 60 | #else |
| 61 | # define pax_init() |
| 62 | # define pax_set_flags(e, p) |
| 63 | # define pax_setup_elf_flags(e, flags) __USE(flags) |
| 64 | #endif |
| 65 | |
| 66 | void pax_mprotect_adjust( |
| 67 | #ifdef PAX_MPROTECT_DEBUG |
| 68 | const char *, size_t, |
| 69 | #endif |
| 70 | struct lwp *, vm_prot_t *, vm_prot_t *); |
| 71 | #ifndef PAX_MPROTECT |
| 72 | # define PAX_MPROTECT_ADJUST(a, b, c) |
| 73 | # define pax_mprotect_prot(l) 0 |
| 74 | #else |
| 75 | # ifdef PAX_MPROTECT_DEBUG |
| 76 | # define PAX_MPROTECT_ADJUST(a, b, c) \ |
| 77 | pax_mprotect_adjust(__FILE__, __LINE__, (a), (b), (c)) |
| 78 | # else |
| 79 | # define PAX_MPROTECT_ADJUST(a, b, c) \ |
| 80 | pax_mprotect_adjust((a), (b), (c)) |
| 81 | # endif |
| 82 | extern int pax_mprotect_prot(struct lwp *); |
| 83 | #endif |
| 84 | int pax_segvguard(struct lwp *, struct vnode *, const char *, bool); |
| 85 | |
| 86 | #define PAX_ASLR_DELTA(delta, lsb, len) \ |
| 87 | (((delta) & ((1UL << (len)) - 1)) << (lsb)) |
| 88 | |
| 89 | #ifdef PAX_ASLR |
| 90 | void pax_aslr_init_vm(struct lwp *, struct vmspace *, struct exec_package *); |
| 91 | void pax_aslr_stack(struct exec_package *, vsize_t *); |
| 92 | uint32_t pax_aslr_stack_gap(struct exec_package *); |
| 93 | vaddr_t pax_aslr_exec_offset(struct exec_package *, vaddr_t); |
| 94 | voff_t pax_aslr_rtld_offset(struct exec_package *, vaddr_t, int); |
| 95 | void pax_aslr_mmap(struct lwp *, vaddr_t *, vaddr_t, int); |
| 96 | #else |
| 97 | # define pax_aslr_init_vm(l, v, e) |
| 98 | # define pax_aslr_stack(e, o) |
| 99 | # define pax_aslr_stack_gap(e) 0 |
| 100 | # define pax_aslr_exec_offset(e, a) MAX(a, PAGE_SIZE) |
| 101 | # define pax_aslr_rtld_offset(e, a, u) 0 |
| 102 | # define pax_aslr_mmap(l, a, b, c) |
| 103 | #endif |
| 104 | |
| 105 | #endif /* !_SYS_PAX_H_ */ |
| 106 | |