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 | |