1 | #ifndef _GNU_SOURCE |
---|
2 | #define _GNU_SOURCE |
---|
3 | #endif |
---|
4 | |
---|
5 | #include <stdlib.h> |
---|
6 | #include <stdio.h> |
---|
7 | #include <limits.h> |
---|
8 | #include <string.h> |
---|
9 | |
---|
10 | #include <execinfo.h> |
---|
11 | #include <sys/syscall.h> |
---|
12 | #include <sys/time.h> |
---|
13 | #include <sys/resource.h> |
---|
14 | #include <sys/types.h> |
---|
15 | #include <sys/stat.h> |
---|
16 | #include <sys/utsname.h> |
---|
17 | #include <fcntl.h> |
---|
18 | #include <unistd.h> |
---|
19 | |
---|
20 | #include <pthread.h> |
---|
21 | |
---|
22 | #include <dlfcn.h> |
---|
23 | |
---|
24 | FILE *log_file = NULL; |
---|
25 | static pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER; |
---|
26 | |
---|
27 | // The malloc hook might use functions that call malloc, and we need to make |
---|
28 | // sure this does not cause an infinite loop. |
---|
29 | static __thread int in_malloc = 0; |
---|
30 | |
---|
31 | __attribute__((__constructor__)) |
---|
32 | static void record_init() { |
---|
33 | struct utsname u; |
---|
34 | uname(&u); |
---|
35 | |
---|
36 | char log_name[PATH_MAX]; |
---|
37 | snprintf(log_name, PATH_MAX, "%s.%d.memlog", u.nodename, getpid()); |
---|
38 | log_file = fopen(log_name, "w"); |
---|
39 | if (!log_file) |
---|
40 | fprintf(stderr, "fopen failed for '%s': %m\n", log_name); |
---|
41 | } |
---|
42 | |
---|
43 | __attribute__((__destructor__)) |
---|
44 | static void record_cleanup() { |
---|
45 | if (!log_file) |
---|
46 | return; |
---|
47 | |
---|
48 | // These functions might call free, but we're shutting down, so don't try to |
---|
49 | // unwind the stack from here... |
---|
50 | in_malloc = 1; |
---|
51 | |
---|
52 | (void) fflush(log_file); |
---|
53 | (void) fclose(log_file); |
---|
54 | } |
---|
55 | |
---|
56 | static void print_context(void *caller) { |
---|
57 | struct rusage usage; |
---|
58 | if (getrusage(RUSAGE_SELF, &usage)) { |
---|
59 | fprintf(stderr, "getrusage failed: %m\n"); |
---|
60 | return; |
---|
61 | } |
---|
62 | |
---|
63 | fprintf(log_file, "\t%ld.%06ld %ld %ld", usage.ru_utime.tv_sec, |
---|
64 | usage.ru_utime.tv_usec, usage.ru_maxrss, syscall(SYS_gettid)); |
---|
65 | |
---|
66 | void *pcs[1024]; |
---|
67 | int num_pcs = backtrace(pcs, 1024); |
---|
68 | |
---|
69 | int found_caller = 0; |
---|
70 | caller = __builtin_extract_return_addr(caller); |
---|
71 | for (int pci = 0; pci < num_pcs; ++pci) { |
---|
72 | intptr_t pc = (intptr_t) pcs[pci]; |
---|
73 | |
---|
74 | if (!pc) |
---|
75 | break; |
---|
76 | |
---|
77 | if (!found_caller) { |
---|
78 | if (pc != (intptr_t) caller) |
---|
79 | continue; |
---|
80 | |
---|
81 | found_caller = 1; |
---|
82 | } |
---|
83 | |
---|
84 | intptr_t off, relpc; |
---|
85 | const char *proc_name; |
---|
86 | const char *file_name; |
---|
87 | Dl_info dlinfo; |
---|
88 | if (dladdr((void *) pc, &dlinfo) && dlinfo.dli_fname && |
---|
89 | *dlinfo.dli_fname) { |
---|
90 | intptr_t saddr = (intptr_t) dlinfo.dli_saddr; |
---|
91 | if (saddr) { |
---|
92 | #if defined(__powerpc64__) && !defined(__powerpc64le__) |
---|
93 | // On PPC64 ELFv1, the symbol address points to the function descriptor, not |
---|
94 | // the actual starting address. |
---|
95 | saddr = *(intptr_t*) saddr; |
---|
96 | #endif |
---|
97 | |
---|
98 | off = pc - saddr; |
---|
99 | relpc = pc - ((intptr_t) dlinfo.dli_fbase); |
---|
100 | } else { |
---|
101 | off = 0; |
---|
102 | relpc = 0; |
---|
103 | } |
---|
104 | |
---|
105 | proc_name = dlinfo.dli_sname; |
---|
106 | if (!proc_name) |
---|
107 | proc_name = "?"; |
---|
108 | |
---|
109 | file_name = dlinfo.dli_fname; |
---|
110 | } else { |
---|
111 | off = pc; |
---|
112 | relpc = pc; |
---|
113 | proc_name = "?"; |
---|
114 | file_name = "?"; |
---|
115 | } |
---|
116 | |
---|
117 | fprintf(log_file, "\t%s (%s+0x%x) [0x%lx (0x%lx)]", file_name, proc_name, (int) off, |
---|
118 | (long) pc, (long) relpc); |
---|
119 | } |
---|
120 | } |
---|
121 | |
---|
122 | static void record_malloc(size_t size, void *ptr, void *caller) { |
---|
123 | if (!log_file) |
---|
124 | return; |
---|
125 | |
---|
126 | if (pthread_mutex_lock(&log_mutex)) |
---|
127 | return; |
---|
128 | |
---|
129 | fprintf(log_file, "M: %zd %p", size, ptr); |
---|
130 | print_context(caller); |
---|
131 | fprintf(log_file, "\n"); |
---|
132 | |
---|
133 | done: |
---|
134 | pthread_mutex_unlock(&log_mutex); |
---|
135 | } |
---|
136 | |
---|
137 | static void record_free(void *ptr, void *caller) { |
---|
138 | if (!log_file) |
---|
139 | return; |
---|
140 | |
---|
141 | if (pthread_mutex_lock(&log_mutex)) |
---|
142 | return; |
---|
143 | |
---|
144 | fprintf(log_file, "F: %p", ptr); |
---|
145 | print_context(caller); |
---|
146 | fprintf(log_file, "\n"); |
---|
147 | |
---|
148 | done: |
---|
149 | pthread_mutex_unlock(&log_mutex); |
---|
150 | } |
---|
151 | |
---|
152 | // glibc exports its underlying malloc implementation under the name |
---|
153 | // __libc_malloc so that hooks like this can use it. |
---|
154 | extern void *__libc_malloc(size_t size); |
---|
155 | extern void *__libc_realloc(void *ptr, size_t size); |
---|
156 | extern void *__libc_calloc(size_t nmemb, size_t size); |
---|
157 | extern void *__libc_memalign(size_t boundary, size_t size); |
---|
158 | extern void __libc_free(void *ptr); |
---|
159 | |
---|
160 | void *malloc(size_t size) { |
---|
161 | if (in_malloc) |
---|
162 | return __libc_malloc(size); |
---|
163 | |
---|
164 | in_malloc = 1; |
---|
165 | |
---|
166 | void *ptr = __libc_malloc(size); |
---|
167 | |
---|
168 | void *caller = __builtin_return_address(0); |
---|
169 | record_malloc(size, ptr, caller); |
---|
170 | |
---|
171 | in_malloc = 0; |
---|
172 | return ptr; |
---|
173 | } |
---|
174 | |
---|
175 | void *realloc(void *ptr, size_t size) { |
---|
176 | if (in_malloc) |
---|
177 | return __libc_realloc(ptr, size); |
---|
178 | |
---|
179 | in_malloc = 1; |
---|
180 | |
---|
181 | void *nptr = __libc_realloc(ptr, size); |
---|
182 | |
---|
183 | void *caller = __builtin_return_address(0); |
---|
184 | if (ptr) |
---|
185 | record_free(ptr, caller); |
---|
186 | record_malloc(size, nptr, caller); |
---|
187 | |
---|
188 | in_malloc = 0; |
---|
189 | |
---|
190 | return nptr; |
---|
191 | } |
---|
192 | |
---|
193 | void *calloc(size_t nmemb, size_t size) { |
---|
194 | if (in_malloc) |
---|
195 | return __libc_calloc(nmemb, size); |
---|
196 | |
---|
197 | in_malloc = 1; |
---|
198 | |
---|
199 | void *ptr = __libc_calloc(nmemb, size); |
---|
200 | |
---|
201 | void *caller = __builtin_return_address(0); |
---|
202 | record_malloc(nmemb*size, ptr, caller); |
---|
203 | |
---|
204 | in_malloc = 0; |
---|
205 | |
---|
206 | return ptr; |
---|
207 | } |
---|
208 | |
---|
209 | void *memalign(size_t boundary, size_t size) { |
---|
210 | if (in_malloc) |
---|
211 | return __libc_memalign(boundary, size); |
---|
212 | |
---|
213 | in_malloc = 1; |
---|
214 | |
---|
215 | void *ptr = __libc_memalign(boundary, size); |
---|
216 | |
---|
217 | void *caller = __builtin_return_address(0); |
---|
218 | record_malloc(size, ptr, caller); |
---|
219 | |
---|
220 | in_malloc = 0; |
---|
221 | |
---|
222 | return ptr; |
---|
223 | } |
---|
224 | |
---|
225 | void free(void *ptr) { |
---|
226 | if (in_malloc || !ptr) |
---|
227 | return __libc_free(ptr); |
---|
228 | |
---|
229 | in_malloc = 1; |
---|
230 | |
---|
231 | void *caller = __builtin_return_address(0); |
---|
232 | record_free(ptr, caller); |
---|
233 | |
---|
234 | __libc_free(ptr); |
---|
235 | |
---|
236 | in_malloc = 0; |
---|
237 | } |
---|
238 | |
---|