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6c57d320 | 1 | /* Test of signal delivery on an alternate stack with MINSIGSTKSZ size. |
dff8da6b | 2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
6c57d320 L |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <signal.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | #include <support/check.h> | |
24 | #include <support/support.h> | |
25 | ||
26 | static volatile sig_atomic_t handler_run; | |
27 | ||
28 | static void | |
29 | handler (int signo) | |
30 | { | |
31 | /* Clear a bit of on-stack memory. */ | |
32 | volatile char buffer[256]; | |
33 | for (size_t i = 0; i < sizeof (buffer); ++i) | |
34 | buffer[i] = 0; | |
35 | handler_run = 1; | |
36 | } | |
37 | ||
38 | int | |
39 | do_test (void) | |
40 | { | |
41 | size_t stack_buffer_size = 64 * 1024 * 1024; | |
42 | void *stack_buffer = xmalloc (stack_buffer_size); | |
43 | void *stack_end = stack_buffer + stack_buffer_size; | |
44 | memset (stack_buffer, 0xCC, stack_buffer_size); | |
45 | ||
46 | void *stack_bottom = stack_buffer + (stack_buffer_size + MINSIGSTKSZ) / 2; | |
47 | void *stack_top = stack_bottom + MINSIGSTKSZ; | |
48 | stack_t stack = | |
49 | { | |
50 | .ss_sp = stack_bottom, | |
51 | .ss_size = MINSIGSTKSZ, | |
52 | }; | |
53 | if (sigaltstack (&stack, NULL) < 0) | |
54 | FAIL_RET ("sigaltstack: %m\n"); | |
55 | ||
56 | struct sigaction act = | |
57 | { | |
58 | .sa_handler = handler, | |
59 | .sa_flags = SA_ONSTACK, | |
60 | }; | |
61 | if (sigaction (SIGUSR1, &act, NULL) < 0) | |
62 | FAIL_RET ("sigaction: %m\n"); | |
63 | ||
64 | if (kill (getpid (), SIGUSR1) < 0) | |
65 | FAIL_RET ("kill: %m\n"); | |
66 | ||
67 | if (handler_run != 1) | |
68 | FAIL_RET ("handler did not run\n"); | |
69 | ||
70 | for (void *p = stack_buffer; p < stack_bottom; ++p) | |
71 | if (*(unsigned char *) p != 0xCC) | |
72 | FAIL_RET ("changed byte %ld bytes below configured stack\n", | |
73 | (long) (stack_bottom - p)); | |
74 | for (void *p = stack_top; p < stack_end; ++p) | |
75 | if (*(unsigned char *) p != 0xCC) | |
76 | FAIL_RET ("changed byte %ld bytes above configured stack\n", | |
77 | (long) (p - stack_top)); | |
78 | ||
79 | free (stack_buffer); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | #include <support/test-driver.c> |