/src/openssh/openbsd-compat/arc4random.h
Line | Count | Source (jump to first uncovered line) |
1 | | /* $OpenBSD: arc4random_linux.h,v 1.12 2019/07/11 10:37:28 inoguchi Exp $ */ |
2 | | |
3 | | /* |
4 | | * Copyright (c) 1996, David Mazieres <dm@uun.org> |
5 | | * Copyright (c) 2008, Damien Miller <djm@openbsd.org> |
6 | | * Copyright (c) 2013, Markus Friedl <markus@openbsd.org> |
7 | | * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org> |
8 | | * |
9 | | * Permission to use, copy, modify, and distribute this software for any |
10 | | * purpose with or without fee is hereby granted, provided that the above |
11 | | * copyright notice and this permission notice appear in all copies. |
12 | | * |
13 | | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
14 | | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
15 | | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
16 | | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
17 | | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
18 | | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
19 | | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
20 | | */ |
21 | | |
22 | | /* |
23 | | * Stub functions for portability. From LibreSSL with some adaptations. |
24 | | */ |
25 | | |
26 | | #ifdef HAVE_SYS_MMAN_H |
27 | | #include <sys/mman.h> |
28 | | #endif |
29 | | |
30 | | #include <signal.h> |
31 | | |
32 | | /* OpenSSH isn't multithreaded */ |
33 | | #define _ARC4_LOCK() |
34 | | #define _ARC4_UNLOCK() |
35 | | #define _ARC4_ATFORK(f) |
36 | | |
37 | | static inline void |
38 | | _getentropy_fail(void) |
39 | 0 | { |
40 | 0 | fatal("getentropy failed"); |
41 | 0 | } |
42 | | |
43 | | static volatile sig_atomic_t _rs_forked; |
44 | | |
45 | | static inline void |
46 | | _rs_forkhandler(void) |
47 | 0 | { |
48 | 0 | _rs_forked = 1; |
49 | 0 | } |
50 | | |
51 | | static inline void |
52 | | _rs_forkdetect(void) |
53 | 1.36M | { |
54 | 1.36M | static pid_t _rs_pid = 0; |
55 | 1.36M | pid_t pid = getpid(); |
56 | | |
57 | 1.36M | if (_rs_pid == 0 || _rs_pid == 1 || _rs_pid != pid || _rs_forked) { |
58 | 1 | _rs_pid = pid; |
59 | 1 | _rs_forked = 0; |
60 | 1 | if (rs) |
61 | 0 | memset(rs, 0, sizeof(*rs)); |
62 | 1 | } |
63 | 1.36M | } |
64 | | |
65 | | static inline int |
66 | | _rs_allocate(struct _rs **rsp, struct _rsx **rsxp) |
67 | 1 | { |
68 | 1 | #if defined(MAP_ANON) && defined(MAP_PRIVATE) |
69 | 1 | if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE, |
70 | 1 | MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) |
71 | 0 | return (-1); |
72 | | |
73 | 1 | if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE, |
74 | 1 | MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) { |
75 | 0 | munmap(*rsp, sizeof(**rsp)); |
76 | 0 | *rsp = NULL; |
77 | 0 | return (-1); |
78 | 0 | } |
79 | | #else |
80 | | if ((*rsp = calloc(1, sizeof(**rsp))) == NULL) |
81 | | return (-1); |
82 | | if ((*rsxp = calloc(1, sizeof(**rsxp))) == NULL) { |
83 | | free(*rsp); |
84 | | *rsp = NULL; |
85 | | return (-1); |
86 | | } |
87 | | #endif |
88 | | |
89 | 1 | _ARC4_ATFORK(_rs_forkhandler); |
90 | 1 | return (0); |
91 | 1 | } |