1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Author: Kévin Dunglas <kevin@dunglas.dev> |
14 +----------------------------------------------------------------------+
15 */
16
17 #ifdef ZEND_MAX_EXECUTION_TIMERS
18
19 #include <stdio.h>
20 #include <signal.h>
21 #include <time.h>
22 #include <unistd.h>
23 #include <errno.h>
24 #include <sys/syscall.h>
25 #include <sys/types.h>
26
27 #include "zend.h"
28 #include "zend_globals.h"
29 #include "zend_portability.h"
30
31 #if __has_feature(memory_sanitizer)
32 # include <sanitizer/msan_interface.h>
33 #endif
34
35 // Musl Libc defines this macro, glibc does not
36 // According to "man 2 timer_create" this field should always be available, but it's not: https://sourceware.org/bugzilla/show_bug.cgi?id=27417
37 # ifndef sigev_notify_thread_id
38 # define sigev_notify_thread_id _sigev_un._tid
39 # endif
40
zend_max_execution_timer_init(void)41 ZEND_API void zend_max_execution_timer_init(void) /* {{{ */
42 {
43 pid_t pid = getpid();
44
45 if (EG(pid) == pid) {
46 return;
47 }
48
49 struct sigevent sev;
50 sev.sigev_notify = SIGEV_THREAD_ID;
51 sev.sigev_value.sival_ptr = &EG(max_execution_timer_timer);
52 sev.sigev_signo = SIGRTMIN;
53 sev.sigev_notify_thread_id = (pid_t) syscall(SYS_gettid);
54
55 #if __has_feature(memory_sanitizer)
56 /* MSan does not intercept timer_create() */
57 __msan_unpoison(&EG(max_execution_timer_timer),
58 sizeof(EG(max_execution_timer_timer)));
59 #endif
60
61 // Measure wall time instead of CPU time as originally planned now that it is possible https://github.com/php/php-src/pull/6504#issuecomment-1370303727
62 if (timer_create(CLOCK_BOOTTIME, &sev, &EG(max_execution_timer_timer)) != 0) {
63 zend_strerror_noreturn(E_ERROR, errno, "Could not create timer");
64 }
65
66 EG(pid) = getpid();
67
68 # ifdef MAX_EXECUTION_TIMERS_DEBUG
69 fprintf(stderr, "Timer %#jx created on thread %d\n", (uintmax_t) EG(max_execution_timer_timer), sev.sigev_notify_thread_id);
70 # endif
71
72 sigaction(sev.sigev_signo, NULL, &EG(oldact));
73 }
74 /* }}} */
75
zend_max_execution_timer_settime(zend_long seconds)76 void zend_max_execution_timer_settime(zend_long seconds) /* {{{ }*/
77 {
78 /* Timer not initialized or shutdown. */
79 if (!EG(pid)) {
80 return;
81 }
82
83 timer_t timer = EG(max_execution_timer_timer);
84
85 // Prevent EINVAL error
86 if (seconds < 0 || seconds > 999999999) {
87 seconds = 0;
88 }
89
90 struct itimerspec its;
91 its.it_value.tv_sec = seconds;
92 its.it_value.tv_nsec = its.it_interval.tv_sec = its.it_interval.tv_nsec = 0;
93
94 # ifdef MAX_EXECUTION_TIMERS_DEBUG
95 fprintf(stderr, "Setting timer %#jx on thread %d (%ld seconds)...\n", (uintmax_t) timer, (pid_t) syscall(SYS_gettid), seconds);
96 # endif
97
98 if (timer_settime(timer, 0, &its, NULL) != 0) {
99 zend_strerror_noreturn(E_ERROR, errno, "Could not set timer");
100 }
101 }
102 /* }}} */
103
zend_max_execution_timer_shutdown(void)104 void zend_max_execution_timer_shutdown(void) /* {{{ */
105 {
106 /* Don't try to delete a timer created before a call to fork() */
107 if (EG(pid) != getpid()) {
108 return;
109 }
110
111 EG(pid) = 0;
112
113 timer_t timer = EG(max_execution_timer_timer);
114
115 # ifdef MAX_EXECUTION_TIMERS_DEBUG
116 fprintf(stderr, "Deleting timer %#jx on thread %d...\n", (uintmax_t) timer, (pid_t) syscall(SYS_gettid));
117 # endif
118
119 int err = timer_delete(timer);
120 if (err != 0) {
121 zend_strerror_noreturn(E_ERROR, errno, "Could not delete timer");
122 }
123 }
124 /* }}}} */
125
126 #endif
127
