1 //===-- sanitizer_malloc_mac.inc --------------------------------*- C++ -*-===//
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
6 //===----------------------------------------------------------------------===//
8 // This file contains Mac-specific malloc interceptors and a custom zone
9 // implementation, which together replace the system allocator.
11 //===----------------------------------------------------------------------===//
13 #include "sanitizer_common/sanitizer_platform.h"
15 #error "This file should only be compiled on Darwin."
18 #include <AvailabilityMacros.h>
19 #include <CoreFoundation/CFBase.h>
21 #include <malloc/malloc.h>
24 #include "interception/interception.h"
25 #include "sanitizer_common/sanitizer_mac.h"
27 // Similar code is used in Google Perftools,
28 // https://github.com/gperftools/gperftools.
30 static malloc_zone_t sanitizer_zone;
32 INTERCEPTOR(malloc_zone_t *, malloc_create_zone,
33 vm_size_t start_size, unsigned zone_flags) {
34 COMMON_MALLOC_ENTER();
35 uptr page_size = GetPageSizeCached();
36 uptr allocated_size = RoundUpTo(sizeof(sanitizer_zone), page_size);
37 COMMON_MALLOC_MEMALIGN(page_size, allocated_size);
38 malloc_zone_t *new_zone = (malloc_zone_t *)p;
39 internal_memcpy(new_zone, &sanitizer_zone, sizeof(sanitizer_zone));
40 new_zone->zone_name = NULL; // The name will be changed anyway.
41 if (GetMacosVersion() >= MACOS_VERSION_LION) {
42 // Prevent the client app from overwriting the zone contents.
43 // Library functions that need to modify the zone will set PROT_WRITE on it.
44 // This matches the behavior of malloc_create_zone() on OSX 10.7 and higher.
45 mprotect(new_zone, allocated_size, PROT_READ);
50 INTERCEPTOR(malloc_zone_t *, malloc_default_zone, void) {
51 COMMON_MALLOC_ENTER();
52 return &sanitizer_zone;
55 INTERCEPTOR(malloc_zone_t *, malloc_default_purgeable_zone, void) {
56 // FIXME: ASan should support purgeable allocations.
57 // https://github.com/google/sanitizers/issues/139
58 COMMON_MALLOC_ENTER();
59 return &sanitizer_zone;
62 INTERCEPTOR(void, malloc_make_purgeable, void *ptr) {
63 // FIXME: ASan should support purgeable allocations. Ignoring them is fine
65 COMMON_MALLOC_ENTER();
68 INTERCEPTOR(int, malloc_make_nonpurgeable, void *ptr) {
69 // FIXME: ASan should support purgeable allocations. Ignoring them is fine
71 COMMON_MALLOC_ENTER();
72 // Must return 0 if the contents were not purged since the last call to
73 // malloc_make_purgeable().
77 INTERCEPTOR(void, malloc_set_zone_name, malloc_zone_t *zone, const char *name) {
78 COMMON_MALLOC_ENTER();
79 // Allocate |sizeof(COMMON_MALLOC_ZONE_NAME "-") + internal_strlen(name)|
82 sizeof(COMMON_MALLOC_ZONE_NAME "-") + (name ? internal_strlen(name) : 0);
83 InternalScopedString new_name(buflen);
84 if (name && zone->introspect == sanitizer_zone.introspect) {
85 new_name.append(COMMON_MALLOC_ZONE_NAME "-%s", name);
86 name = new_name.data();
89 // Call the system malloc's implementation for both external and our zones,
90 // since that appropriately changes VM region protections on the zone.
91 REAL(malloc_set_zone_name)(zone, name);
94 INTERCEPTOR(void *, malloc, size_t size) {
95 COMMON_MALLOC_ENTER();
96 COMMON_MALLOC_MALLOC(size);
100 INTERCEPTOR(void, free, void *ptr) {
101 COMMON_MALLOC_ENTER();
103 COMMON_MALLOC_FREE(ptr);
106 INTERCEPTOR(void *, realloc, void *ptr, size_t size) {
107 COMMON_MALLOC_ENTER();
108 COMMON_MALLOC_REALLOC(ptr, size);
112 INTERCEPTOR(void *, calloc, size_t nmemb, size_t size) {
113 COMMON_MALLOC_ENTER();
114 COMMON_MALLOC_CALLOC(nmemb, size);
118 INTERCEPTOR(void *, valloc, size_t size) {
119 COMMON_MALLOC_ENTER();
120 COMMON_MALLOC_VALLOC(size);
124 INTERCEPTOR(size_t, malloc_good_size, size_t size) {
125 COMMON_MALLOC_ENTER();
126 return sanitizer_zone.introspect->good_size(&sanitizer_zone, size);
129 INTERCEPTOR(int, posix_memalign, void **memptr, size_t alignment, size_t size) {
130 COMMON_MALLOC_ENTER();
132 COMMON_MALLOC_MEMALIGN(alignment, size);
142 // TODO(glider): the __sanitizer_mz_* functions should be united with the Linux
143 // wrappers, as they are basically copied from there.
145 SANITIZER_INTERFACE_ATTRIBUTE
146 size_t __sanitizer_mz_size(malloc_zone_t* zone, const void* ptr) {
147 COMMON_MALLOC_SIZE(ptr);
152 SANITIZER_INTERFACE_ATTRIBUTE
153 void *__sanitizer_mz_malloc(malloc_zone_t *zone, uptr size) {
154 COMMON_MALLOC_ENTER();
155 COMMON_MALLOC_MALLOC(size);
160 SANITIZER_INTERFACE_ATTRIBUTE
161 void *__sanitizer_mz_calloc(malloc_zone_t *zone, size_t nmemb, size_t size) {
162 if (UNLIKELY(!COMMON_MALLOC_SANITIZER_INITIALIZED)) {
163 // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
164 const size_t kCallocPoolSize = 1024;
165 static uptr calloc_memory_for_dlsym[kCallocPoolSize];
166 static size_t allocated;
167 size_t size_in_words = ((nmemb * size) + kWordSize - 1) / kWordSize;
168 void *mem = (void*)&calloc_memory_for_dlsym[allocated];
169 allocated += size_in_words;
170 CHECK(allocated < kCallocPoolSize);
173 COMMON_MALLOC_CALLOC(nmemb, size);
178 SANITIZER_INTERFACE_ATTRIBUTE
179 void *__sanitizer_mz_valloc(malloc_zone_t *zone, size_t size) {
180 COMMON_MALLOC_ENTER();
181 COMMON_MALLOC_VALLOC(size);
185 // TODO(glider): the allocation callbacks need to be refactored.
187 SANITIZER_INTERFACE_ATTRIBUTE
188 void __sanitizer_mz_free(malloc_zone_t *zone, void *ptr) {
190 COMMON_MALLOC_FREE(ptr);
193 #define GET_ZONE_FOR_PTR(ptr) \
194 malloc_zone_t *zone_ptr = malloc_zone_from_ptr(ptr); \
195 const char *zone_name = (zone_ptr == 0) ? 0 : zone_ptr->zone_name
198 SANITIZER_INTERFACE_ATTRIBUTE
199 void *__sanitizer_mz_realloc(malloc_zone_t *zone, void *ptr, size_t new_size) {
201 COMMON_MALLOC_MALLOC(new_size);
204 COMMON_MALLOC_SIZE(ptr);
206 COMMON_MALLOC_REALLOC(ptr, new_size);
209 // We can't recover from reallocating an unknown address, because
210 // this would require reading at most |new_size| bytes from
211 // potentially unaccessible memory.
212 GET_ZONE_FOR_PTR(ptr);
213 COMMON_MALLOC_REPORT_UNKNOWN_REALLOC(ptr, zone_ptr, zone_name);
220 SANITIZER_INTERFACE_ATTRIBUTE
221 void __sanitizer_mz_destroy(malloc_zone_t* zone) {
222 // A no-op -- we will not be destroyed!
223 Report("__sanitizer_mz_destroy() called -- ignoring\n");
227 SANITIZER_INTERFACE_ATTRIBUTE
228 void *__sanitizer_mz_memalign(malloc_zone_t *zone, size_t align, size_t size) {
229 COMMON_MALLOC_ENTER();
230 COMMON_MALLOC_MEMALIGN(align, size);
234 // This function is currently unused, and we build with -Werror.
236 void __sanitizer_mz_free_definite_size(
237 malloc_zone_t* zone, void *ptr, size_t size) {
238 // TODO(glider): check that |size| is valid.
243 kern_return_t mi_enumerator(task_t task, void *,
244 unsigned type_mask, vm_address_t zone_address,
245 memory_reader_t reader,
246 vm_range_recorder_t recorder) {
247 // Should enumerate all the pointers we have. Seems like a lot of work.
251 size_t mi_good_size(malloc_zone_t *zone, size_t size) {
252 // I think it's always safe to return size, but we maybe could do better.
256 boolean_t mi_check(malloc_zone_t *zone) {
260 void mi_print(malloc_zone_t *zone, boolean_t verbose) {
264 void mi_log(malloc_zone_t *zone, void *address) {
265 // I don't think we support anything like this
268 void mi_force_lock(malloc_zone_t *zone) {
269 COMMON_MALLOC_FORCE_LOCK();
272 void mi_force_unlock(malloc_zone_t *zone) {
273 COMMON_MALLOC_FORCE_UNLOCK();
276 void mi_statistics(malloc_zone_t *zone, malloc_statistics_t *stats) {
277 COMMON_MALLOC_FILL_STATS(zone, stats);
280 boolean_t mi_zone_locked(malloc_zone_t *zone) {
285 } // unnamed namespace
287 namespace COMMON_MALLOC_NAMESPACE {
289 void ReplaceSystemMalloc() {
290 static malloc_introspection_t sanitizer_zone_introspection;
291 // Ok to use internal_memset, these places are not performance-critical.
292 internal_memset(&sanitizer_zone_introspection, 0,
293 sizeof(sanitizer_zone_introspection));
295 sanitizer_zone_introspection.enumerator = &mi_enumerator;
296 sanitizer_zone_introspection.good_size = &mi_good_size;
297 sanitizer_zone_introspection.check = &mi_check;
298 sanitizer_zone_introspection.print = &mi_print;
299 sanitizer_zone_introspection.log = &mi_log;
300 sanitizer_zone_introspection.force_lock = &mi_force_lock;
301 sanitizer_zone_introspection.force_unlock = &mi_force_unlock;
302 sanitizer_zone_introspection.statistics = &mi_statistics;
303 sanitizer_zone_introspection.zone_locked = &mi_zone_locked;
305 internal_memset(&sanitizer_zone, 0, sizeof(malloc_zone_t));
307 // Use version 6 for OSX >= 10.6.
308 sanitizer_zone.version = 6;
309 sanitizer_zone.zone_name = COMMON_MALLOC_ZONE_NAME;
310 sanitizer_zone.size = &__sanitizer_mz_size;
311 sanitizer_zone.malloc = &__sanitizer_mz_malloc;
312 sanitizer_zone.calloc = &__sanitizer_mz_calloc;
313 sanitizer_zone.valloc = &__sanitizer_mz_valloc;
314 sanitizer_zone.free = &__sanitizer_mz_free;
315 sanitizer_zone.realloc = &__sanitizer_mz_realloc;
316 sanitizer_zone.destroy = &__sanitizer_mz_destroy;
317 sanitizer_zone.batch_malloc = 0;
318 sanitizer_zone.batch_free = 0;
319 sanitizer_zone.free_definite_size = 0;
320 sanitizer_zone.memalign = &__sanitizer_mz_memalign;
321 sanitizer_zone.introspect = &sanitizer_zone_introspection;
323 // Register the zone.
324 malloc_zone_register(&sanitizer_zone);
327 } // namespace COMMON_MALLOC_NAMESPACE