Fix: lttng-snapshot: use after free of max size argument
[lttng-tools.git] / tests / utils / testapp / gen-syscall-events-callstack / gen-syscall-events-callstack.c
1 /*
2 * Copyright (C) 2017 Francis Deslauriers <francis.deslauriers@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
8 #include <fcntl.h>
9 #include <signal.h>
10 #include <stdbool.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <sys/syscall.h>
15 #include <sys/types.h>
16 #include <unistd.h>
17
18 #include "utils.h"
19
20 /**
21 * The process waits for the creation of a file passed as argument from an
22 * external processes to execute a syscall and exiting. This is useful for tests
23 * in combinaison with LTTng's PID tracker feature where we can trace the kernel
24 * events generated by our test process only.
25 */
26
27 #if defined(__clang__)
28 #define nooptimization __attribute__((noinline)) __attribute__((optnone))
29 #else
30 #define nooptimization __attribute__((noinline)) __attribute__((optimize(0)))
31 #endif
32
33 volatile int val = 0;
34
35 long nooptimization my_gettid(void);
36 long nooptimization
37 my_gettid(void)
38 {
39 long ret;
40 #ifdef __x86_64
41 asm volatile
42 (
43 "syscall"
44 : "=a" (ret)
45 : "0"(__NR_gettid)
46 : "cc", "rcx", "r11", "memory"
47 );
48 #elif defined(__i386)
49 asm volatile
50 (
51 "int $0x80"
52 : "=a" (ret)
53 : "0"(__NR_gettid)
54 : "cc", "edi", "esi", "memory"
55 );
56 #else
57 #error "Userspace callstack test not supported for this architecture."
58 #endif
59 return ret;
60 }
61
62 int nooptimization fct_c(void);
63 int nooptimization
64 fct_c(void)
65 {
66 return my_gettid();
67 }
68
69 int nooptimization fct_b(void);
70 int nooptimization
71 fct_b(void)
72 {
73 val += fct_c();
74 return val;
75 }
76
77 int nooptimization fct_a(void);
78 int nooptimization
79 fct_a(void)
80 {
81 val += fct_b();
82 return val;
83 }
84
85 int main(int argc, char **argv)
86 {
87 int ret = 0;
88 char *start_file;
89
90 if (argc != 2) {
91 fprintf(stderr, "Error: Missing argument\n");
92 fprintf(stderr, "USAGE: %s PATH_WAIT_FILE\n", argv[0]);
93 ret = -1;
94 goto error;
95 }
96
97 start_file = argv[1];
98
99 /*
100 * Wait for the start_file to be created by an external process
101 * (typically the test script) before executing the syscall
102 */
103 ret = wait_on_file(start_file);
104 if (ret != 0) {
105 goto error;
106 }
107
108 /* Start the callchain to the syscall */
109 ret = fct_a();
110
111 /* Return success */
112 if (ret >= 0) {
113 ret = 0;
114 }
115
116 error:
117 return ret;
118 }
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