1 //===-- sanitizer_fuchsia.cpp ---------------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file is shared between AddressSanitizer and other sanitizer
10 // run-time libraries and implements Fuchsia-specific functions from
11 // sanitizer_common.h.
12 //===----------------------------------------------------------------------===//
14 #include "sanitizer_fuchsia.h"
20 #include <zircon/errors.h>
21 #include <zircon/process.h>
22 #include <zircon/syscalls.h>
23 #include <zircon/utc.h>
25 #include "sanitizer_common.h"
26 #include "sanitizer_libc.h"
27 #include "sanitizer_mutex.h"
29 namespace __sanitizer {
31 void NORETURN internal__exit(int exitcode) { _zx_process_exit(exitcode); }
33 uptr internal_sched_yield() {
34 zx_status_t status = _zx_nanosleep(0);
35 CHECK_EQ(status, ZX_OK);
36 return 0; // Why doesn't this return void?
39 void internal_usleep(u64 useconds) {
40 zx_status_t status = _zx_nanosleep(_zx_deadline_after(ZX_USEC(useconds)));
41 CHECK_EQ(status, ZX_OK);
45 zx_handle_t utc_clock = _zx_utc_reference_get();
46 CHECK_NE(utc_clock, ZX_HANDLE_INVALID);
48 zx_status_t status = _zx_clock_read(utc_clock, &time);
49 CHECK_EQ(status, ZX_OK);
53 u64 MonotonicNanoTime() { return _zx_clock_get_monotonic(); }
55 uptr internal_getpid() {
56 zx_info_handle_basic_t info;
58 _zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &info,
59 sizeof(info), NULL, NULL);
60 CHECK_EQ(status, ZX_OK);
61 uptr pid = static_cast<uptr>(info.koid);
62 CHECK_EQ(pid, info.koid);
66 int internal_dlinfo(void *handle, int request, void *p) { UNIMPLEMENTED(); }
68 uptr GetThreadSelf() { return reinterpret_cast<uptr>(thrd_current()); }
70 tid_t GetTid() { return GetThreadSelf(); }
72 void Abort() { abort(); }
74 int Atexit(void (*function)(void)) { return atexit(function); }
76 void GetThreadStackTopAndBottom(bool, uptr *stack_top, uptr *stack_bottom) {
78 CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
81 CHECK_EQ(pthread_attr_getstack(&attr, &base, &size), 0);
82 CHECK_EQ(pthread_attr_destroy(&attr), 0);
84 *stack_bottom = reinterpret_cast<uptr>(base);
85 *stack_top = *stack_bottom + size;
88 void InitializePlatformEarly() {}
91 void CheckMPROTECT() {}
92 void PlatformPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {}
93 void DisableCoreDumperIfNecessary() {}
94 void InstallDeadlySignalHandlers(SignalHandlerType handler) {}
95 void SetAlternateSignalStack() {}
96 void UnsetAlternateSignalStack() {}
99 bool SignalContext::IsStackOverflow() const { return false; }
100 void SignalContext::DumpAllRegisters(void *context) { UNIMPLEMENTED(); }
101 const char *SignalContext::Describe() const { UNIMPLEMENTED(); }
103 void FutexWait(atomic_uint32_t *p, u32 cmp) {
104 zx_status_t status = _zx_futex_wait(reinterpret_cast<zx_futex_t *>(p), cmp,
105 ZX_HANDLE_INVALID, ZX_TIME_INFINITE);
106 if (status != ZX_ERR_BAD_STATE) // Normal race.
107 CHECK_EQ(status, ZX_OK);
110 void FutexWake(atomic_uint32_t *p, u32 count) {
111 zx_status_t status = _zx_futex_wake(reinterpret_cast<zx_futex_t *>(p), count);
112 CHECK_EQ(status, ZX_OK);
115 uptr GetPageSize() { return _zx_system_get_page_size(); }
117 uptr GetMmapGranularity() { return _zx_system_get_page_size(); }
119 sanitizer_shadow_bounds_t ShadowBounds;
121 void InitShadowBounds() { ShadowBounds = __sanitizer_shadow_bounds(); }
123 uptr GetMaxUserVirtualAddress() {
125 return ShadowBounds.memory_limit - 1;
128 uptr GetMaxVirtualAddress() { return GetMaxUserVirtualAddress(); }
130 static void *DoAnonymousMmapOrDie(uptr size, const char *mem_type,
131 bool raw_report, bool die_for_nomem) {
132 size = RoundUpTo(size, GetPageSize());
135 zx_status_t status = _zx_vmo_create(size, 0, &vmo);
136 if (status != ZX_OK) {
137 if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
138 ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status,
142 _zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
143 internal_strlen(mem_type));
145 // TODO(mcgrathr): Maybe allocate a VMAR for all sanitizer heap and use that?
148 _zx_vmar_map(_zx_vmar_root_self(), ZX_VM_PERM_READ | ZX_VM_PERM_WRITE, 0,
149 vmo, 0, size, &addr);
150 _zx_handle_close(vmo);
152 if (status != ZX_OK) {
153 if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
154 ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status,
159 IncreaseTotalMmap(size);
161 return reinterpret_cast<void *>(addr);
164 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
165 return DoAnonymousMmapOrDie(size, mem_type, raw_report, true);
168 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
169 return MmapOrDie(size, mem_type);
172 void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
173 return DoAnonymousMmapOrDie(size, mem_type, false, false);
176 uptr ReservedAddressRange::Init(uptr init_size, const char *name,
178 init_size = RoundUpTo(init_size, GetPageSize());
179 DCHECK_EQ(os_handle_, ZX_HANDLE_INVALID);
182 zx_status_t status = _zx_vmar_allocate(
183 _zx_vmar_root_self(),
184 ZX_VM_CAN_MAP_READ | ZX_VM_CAN_MAP_WRITE | ZX_VM_CAN_MAP_SPECIFIC, 0,
185 init_size, &vmar, &base);
187 ReportMmapFailureAndDie(init_size, name, "zx_vmar_allocate", status);
188 base_ = reinterpret_cast<void *>(base);
193 return reinterpret_cast<uptr>(base_);
196 static uptr DoMmapFixedOrDie(zx_handle_t vmar, uptr fixed_addr, uptr map_size,
197 void *base, const char *name, bool die_for_nomem) {
198 uptr offset = fixed_addr - reinterpret_cast<uptr>(base);
199 map_size = RoundUpTo(map_size, GetPageSize());
201 zx_status_t status = _zx_vmo_create(map_size, 0, &vmo);
202 if (status != ZX_OK) {
203 if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
204 ReportMmapFailureAndDie(map_size, name, "zx_vmo_create", status);
207 _zx_object_set_property(vmo, ZX_PROP_NAME, name, internal_strlen(name));
208 DCHECK_GE(base + size_, map_size + offset);
212 _zx_vmar_map(vmar, ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_SPECIFIC,
213 offset, vmo, 0, map_size, &addr);
214 _zx_handle_close(vmo);
215 if (status != ZX_OK) {
216 if (status != ZX_ERR_NO_MEMORY || die_for_nomem) {
217 ReportMmapFailureAndDie(map_size, name, "zx_vmar_map", status);
221 IncreaseTotalMmap(map_size);
225 uptr ReservedAddressRange::Map(uptr fixed_addr, uptr map_size,
227 return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_, name_,
231 uptr ReservedAddressRange::MapOrDie(uptr fixed_addr, uptr map_size,
233 return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_, name_, true);
236 void UnmapOrDieVmar(void *addr, uptr size, zx_handle_t target_vmar) {
239 size = RoundUpTo(size, GetPageSize());
242 _zx_vmar_unmap(target_vmar, reinterpret_cast<uintptr_t>(addr), size);
243 if (status != ZX_OK) {
244 Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
245 SanitizerToolName, size, size, addr);
246 CHECK("unable to unmap" && 0);
249 DecreaseTotalMmap(size);
252 void ReservedAddressRange::Unmap(uptr addr, uptr size) {
253 CHECK_LE(size, size_);
254 const zx_handle_t vmar = static_cast<zx_handle_t>(os_handle_);
255 if (addr == reinterpret_cast<uptr>(base_)) {
257 // Destroying the vmar effectively unmaps the whole mapping.
258 _zx_vmar_destroy(vmar);
259 _zx_handle_close(vmar);
260 os_handle_ = static_cast<uptr>(ZX_HANDLE_INVALID);
261 DecreaseTotalMmap(size);
265 CHECK_EQ(addr + size, reinterpret_cast<uptr>(base_) + size_);
267 // Partial unmapping does not affect the fact that the initial range is still
268 // reserved, and the resulting unmapped memory can't be reused.
269 UnmapOrDieVmar(reinterpret_cast<void *>(addr), size, vmar);
272 // This should never be called.
273 void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
277 bool MprotectNoAccess(uptr addr, uptr size) {
278 return _zx_vmar_protect(_zx_vmar_root_self(), 0, addr, size) == ZX_OK;
281 bool MprotectReadOnly(uptr addr, uptr size) {
282 return _zx_vmar_protect(_zx_vmar_root_self(), ZX_VM_PERM_READ, addr, size) ==
286 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
287 const char *mem_type) {
288 CHECK_GE(size, GetPageSize());
289 CHECK(IsPowerOfTwo(size));
290 CHECK(IsPowerOfTwo(alignment));
293 zx_status_t status = _zx_vmo_create(size, 0, &vmo);
294 if (status != ZX_OK) {
295 if (status != ZX_ERR_NO_MEMORY)
296 ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status, false);
299 _zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
300 internal_strlen(mem_type));
302 // TODO(mcgrathr): Maybe allocate a VMAR for all sanitizer heap and use that?
304 // Map a larger size to get a chunk of address space big enough that
305 // it surely contains an aligned region of the requested size. Then
306 // overwrite the aligned middle portion with a mapping from the
307 // beginning of the VMO, and unmap the excess before and after.
308 size_t map_size = size + alignment;
311 _zx_vmar_map(_zx_vmar_root_self(), ZX_VM_PERM_READ | ZX_VM_PERM_WRITE, 0,
312 vmo, 0, map_size, &addr);
313 if (status == ZX_OK) {
314 uintptr_t map_addr = addr;
315 uintptr_t map_end = map_addr + map_size;
316 addr = RoundUpTo(map_addr, alignment);
317 uintptr_t end = addr + size;
318 if (addr != map_addr) {
320 status = _zx_object_get_info(_zx_vmar_root_self(), ZX_INFO_VMAR, &info,
321 sizeof(info), NULL, NULL);
322 if (status == ZX_OK) {
324 status = _zx_vmar_map(
325 _zx_vmar_root_self(),
326 ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_SPECIFIC_OVERWRITE,
327 addr - info.base, vmo, 0, size, &new_addr);
329 CHECK_EQ(new_addr, addr);
332 if (status == ZX_OK && addr != map_addr)
333 status = _zx_vmar_unmap(_zx_vmar_root_self(), map_addr, addr - map_addr);
334 if (status == ZX_OK && end != map_end)
335 status = _zx_vmar_unmap(_zx_vmar_root_self(), end, map_end - end);
337 _zx_handle_close(vmo);
339 if (status != ZX_OK) {
340 if (status != ZX_ERR_NO_MEMORY)
341 ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status, false);
345 IncreaseTotalMmap(size);
347 return reinterpret_cast<void *>(addr);
350 void UnmapOrDie(void *addr, uptr size) {
351 UnmapOrDieVmar(addr, size, _zx_vmar_root_self());
354 void ReleaseMemoryPagesToOS(uptr beg, uptr end) {
355 uptr beg_aligned = RoundUpTo(beg, GetPageSize());
356 uptr end_aligned = RoundDownTo(end, GetPageSize());
357 if (beg_aligned < end_aligned) {
358 zx_handle_t root_vmar = _zx_vmar_root_self();
359 CHECK_NE(root_vmar, ZX_HANDLE_INVALID);
361 _zx_vmar_op_range(root_vmar, ZX_VMAR_OP_DECOMMIT, beg_aligned,
362 end_aligned - beg_aligned, nullptr, 0);
363 CHECK_EQ(status, ZX_OK);
367 void DumpProcessMap() {
368 // TODO(mcgrathr): write it
372 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
373 // TODO(mcgrathr): Figure out a better way.
375 zx_status_t status = _zx_vmo_create(size, 0, &vmo);
376 if (status == ZX_OK) {
377 status = _zx_vmo_write(vmo, reinterpret_cast<const void *>(beg), 0, size);
378 _zx_handle_close(vmo);
380 return status == ZX_OK;
383 // FIXME implement on this platform.
384 void GetMemoryProfile(fill_profile_f cb, uptr *stats) {}
386 bool ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
387 uptr *read_len, uptr max_len, error_t *errno_p) {
389 zx_status_t status = __sanitizer_get_configuration(file_name, &vmo);
390 if (status == ZX_OK) {
392 status = _zx_vmo_get_size(vmo, &vmo_size);
393 if (status == ZX_OK) {
394 if (vmo_size < max_len)
396 size_t map_size = RoundUpTo(max_len, GetPageSize());
398 status = _zx_vmar_map(_zx_vmar_root_self(), ZX_VM_PERM_READ, 0, vmo, 0,
400 if (status == ZX_OK) {
401 *buff = reinterpret_cast<char *>(addr);
402 *buff_size = map_size;
406 _zx_handle_close(vmo);
408 if (status != ZX_OK && errno_p)
410 return status == ZX_OK;
413 void RawWrite(const char *buffer) {
414 constexpr size_t size = 128;
415 static _Thread_local char line[size];
416 static _Thread_local size_t lastLineEnd = 0;
417 static _Thread_local size_t cur = 0;
421 if (lastLineEnd == 0)
423 __sanitizer_log_write(line, lastLineEnd);
424 internal_memmove(line, line + lastLineEnd, cur - lastLineEnd);
425 cur = cur - lastLineEnd;
429 lastLineEnd = cur + 1;
430 line[cur++] = *buffer++;
432 // Flush all complete lines before returning.
433 if (lastLineEnd != 0) {
434 __sanitizer_log_write(line, lastLineEnd);
435 internal_memmove(line, line + lastLineEnd, cur - lastLineEnd);
436 cur = cur - lastLineEnd;
441 void CatastrophicErrorWrite(const char *buffer, uptr length) {
442 __sanitizer_log_write(buffer, length);
446 char **StoredEnviron;
448 char **GetArgv() { return StoredArgv; }
449 char **GetEnviron() { return StoredEnviron; }
451 const char *GetEnv(const char *name) {
453 uptr NameLen = internal_strlen(name);
454 for (char **Env = StoredEnviron; *Env != 0; Env++) {
455 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
456 return (*Env) + NameLen + 1;
462 uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) {
463 const char *argv0 = "<UNKNOWN>";
464 if (StoredArgv && StoredArgv[0]) {
465 argv0 = StoredArgv[0];
467 internal_strncpy(buf, argv0, buf_len);
468 return internal_strlen(buf);
471 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
472 return ReadBinaryName(buf, buf_len);
475 uptr MainThreadStackBase, MainThreadStackSize;
477 bool GetRandom(void *buffer, uptr length, bool blocking) {
478 CHECK_LE(length, ZX_CPRNG_DRAW_MAX_LEN);
479 _zx_cprng_draw(buffer, length);
483 u32 GetNumberOfCPUs() { return zx_system_get_num_cpus(); }
485 uptr GetRSS() { UNIMPLEMENTED(); }
487 void *internal_start_thread(void *(*func)(void *arg), void *arg) { return 0; }
488 void internal_join_thread(void *th) {}
490 void InitializePlatformCommonFlags(CommonFlags *cf) {}
492 } // namespace __sanitizer
494 using namespace __sanitizer;
497 void __sanitizer_startup_hook(int argc, char **argv, char **envp,
498 void *stack_base, size_t stack_size) {
499 __sanitizer::StoredArgv = argv;
500 __sanitizer::StoredEnviron = envp;
501 __sanitizer::MainThreadStackBase = reinterpret_cast<uintptr_t>(stack_base);
502 __sanitizer::MainThreadStackSize = stack_size;
505 void __sanitizer_set_report_path(const char *path) {
506 // Handle the initialization code in each sanitizer, but no other calls.
507 // This setting is never consulted on Fuchsia.
508 DCHECK_EQ(path, common_flags()->log_path);
511 void __sanitizer_set_report_fd(void *fd) {
512 UNREACHABLE("not available on Fuchsia");
515 const char *__sanitizer_get_report_path() {
516 UNREACHABLE("not available on Fuchsia");
520 #endif // SANITIZER_FUCHSIA