| //===-- sanitizer_common.cpp ----------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is shared between AddressSanitizer and ThreadSanitizer |
| // run-time libraries. |
| //===----------------------------------------------------------------------===// |
| |
| #include "sanitizer_common.h" |
| #include "sanitizer_allocator_interface.h" |
| #include "sanitizer_allocator_internal.h" |
| #include "sanitizer_atomic.h" |
| #include "sanitizer_flags.h" |
| #include "sanitizer_libc.h" |
| #include "sanitizer_placement_new.h" |
| |
| namespace __sanitizer { |
| |
| const char *SanitizerToolName = "SanitizerTool"; |
| |
| atomic_uint32_t current_verbosity; |
| uptr PageSizeCached; |
| u32 NumberOfCPUsCached; |
| |
| // PID of the tracer task in StopTheWorld. It shares the address space with the |
| // main process, but has a different PID and thus requires special handling. |
| uptr stoptheworld_tracer_pid = 0; |
| // Cached pid of parent process - if the parent process dies, we want to keep |
| // writing to the same log file. |
| uptr stoptheworld_tracer_ppid = 0; |
| |
| void NORETURN ReportMmapFailureAndDie(uptr size, const char *mem_type, |
| const char *mmap_type, error_t err, |
| bool raw_report) { |
| static int recursion_count; |
| if (SANITIZER_RTEMS || raw_report || recursion_count) { |
| // If we are on RTEMS or raw report is requested or we went into recursion, |
| // just die. The Report() and CHECK calls below may call mmap recursively |
| // and fail. |
| RawWrite("ERROR: Failed to mmap\n"); |
| Die(); |
| } |
| recursion_count++; |
| Report("ERROR: %s failed to " |
| "%s 0x%zx (%zd) bytes of %s (error code: %d)\n", |
| SanitizerToolName, mmap_type, size, size, mem_type, err); |
| #if !SANITIZER_GO |
| DumpProcessMap(); |
| #endif |
| UNREACHABLE("unable to mmap"); |
| } |
| |
| typedef bool UptrComparisonFunction(const uptr &a, const uptr &b); |
| typedef bool U32ComparisonFunction(const u32 &a, const u32 &b); |
| |
| const char *StripPathPrefix(const char *filepath, |
| const char *strip_path_prefix) { |
| if (!filepath) return nullptr; |
| if (!strip_path_prefix) return filepath; |
| const char *res = filepath; |
| if (const char *pos = internal_strstr(filepath, strip_path_prefix)) |
| res = pos + internal_strlen(strip_path_prefix); |
| if (res[0] == '.' && res[1] == '/') |
| res += 2; |
| return res; |
| } |
| |
| const char *StripModuleName(const char *module) { |
| if (!module) |
| return nullptr; |
| if (SANITIZER_WINDOWS) { |
| // On Windows, both slash and backslash are possible. |
| // Pick the one that goes last. |
| if (const char *bslash_pos = internal_strrchr(module, '\\')) |
| return StripModuleName(bslash_pos + 1); |
| } |
| if (const char *slash_pos = internal_strrchr(module, '/')) { |
| return slash_pos + 1; |
| } |
| return module; |
| } |
| |
| void ReportErrorSummary(const char *error_message, const char *alt_tool_name) { |
| if (!common_flags()->print_summary) |
| return; |
| InternalScopedString buff(kMaxSummaryLength); |
| buff.append("SUMMARY: %s: %s", |
| alt_tool_name ? alt_tool_name : SanitizerToolName, error_message); |
| __sanitizer_report_error_summary(buff.data()); |
| } |
| |
| // Removes the ANSI escape sequences from the input string (in-place). |
| void RemoveANSIEscapeSequencesFromString(char *str) { |
| if (!str) |
| return; |
| |
| // We are going to remove the escape sequences in place. |
| char *s = str; |
| char *z = str; |
| while (*s != '\0') { |
| CHECK_GE(s, z); |
| // Skip over ANSI escape sequences with pointer 's'. |
| if (*s == '\033' && *(s + 1) == '[') { |
| s = internal_strchrnul(s, 'm'); |
| if (*s == '\0') { |
| break; |
| } |
| s++; |
| continue; |
| } |
| // 's' now points at a character we want to keep. Copy over the buffer |
| // content if the escape sequence has been perviously skipped andadvance |
| // both pointers. |
| if (s != z) |
| *z = *s; |
| |
| // If we have not seen an escape sequence, just advance both pointers. |
| z++; |
| s++; |
| } |
| |
| // Null terminate the string. |
| *z = '\0'; |
| } |
| |
| void LoadedModule::set(const char *module_name, uptr base_address) { |
| clear(); |
| full_name_ = internal_strdup(module_name); |
| base_address_ = base_address; |
| } |
| |
| void LoadedModule::set(const char *module_name, uptr base_address, |
| ModuleArch arch, u8 uuid[kModuleUUIDSize], |
| bool instrumented) { |
| set(module_name, base_address); |
| arch_ = arch; |
| internal_memcpy(uuid_, uuid, sizeof(uuid_)); |
| instrumented_ = instrumented; |
| } |
| |
| void LoadedModule::clear() { |
| InternalFree(full_name_); |
| base_address_ = 0; |
| max_executable_address_ = 0; |
| full_name_ = nullptr; |
| arch_ = kModuleArchUnknown; |
| internal_memset(uuid_, 0, kModuleUUIDSize); |
| instrumented_ = false; |
| while (!ranges_.empty()) { |
| AddressRange *r = ranges_.front(); |
| ranges_.pop_front(); |
| InternalFree(r); |
| } |
| } |
| |
| void LoadedModule::addAddressRange(uptr beg, uptr end, bool executable, |
| bool writable, const char *name) { |
| void *mem = InternalAlloc(sizeof(AddressRange)); |
| AddressRange *r = |
| new(mem) AddressRange(beg, end, executable, writable, name); |
| ranges_.push_back(r); |
| if (executable && end > max_executable_address_) |
| max_executable_address_ = end; |
| } |
| |
| bool LoadedModule::containsAddress(uptr address) const { |
| for (const AddressRange &r : ranges()) { |
| if (r.beg <= address && address < r.end) |
| return true; |
| } |
| return false; |
| } |
| |
| static atomic_uintptr_t g_total_mmaped; |
| |
| void IncreaseTotalMmap(uptr size) { |
| if (!common_flags()->mmap_limit_mb) return; |
| uptr total_mmaped = |
| atomic_fetch_add(&g_total_mmaped, size, memory_order_relaxed) + size; |
| // Since for now mmap_limit_mb is not a user-facing flag, just kill |
| // a program. Use RAW_CHECK to avoid extra mmaps in reporting. |
| RAW_CHECK((total_mmaped >> 20) < common_flags()->mmap_limit_mb); |
| } |
| |
| void DecreaseTotalMmap(uptr size) { |
| if (!common_flags()->mmap_limit_mb) return; |
| atomic_fetch_sub(&g_total_mmaped, size, memory_order_relaxed); |
| } |
| |
| bool TemplateMatch(const char *templ, const char *str) { |
| if ((!str) || str[0] == 0) |
| return false; |
| bool start = false; |
| if (templ && templ[0] == '^') { |
| start = true; |
| templ++; |
| } |
| bool asterisk = false; |
| while (templ && templ[0]) { |
| if (templ[0] == '*') { |
| templ++; |
| start = false; |
| asterisk = true; |
| continue; |
| } |
| if (templ[0] == '$') |
| return str[0] == 0 || asterisk; |
| if (str[0] == 0) |
| return false; |
| char *tpos = (char*)internal_strchr(templ, '*'); |
| char *tpos1 = (char*)internal_strchr(templ, '$'); |
| if ((!tpos) || (tpos1 && tpos1 < tpos)) |
| tpos = tpos1; |
| if (tpos) |
| tpos[0] = 0; |
| const char *str0 = str; |
| const char *spos = internal_strstr(str, templ); |
| str = spos + internal_strlen(templ); |
| templ = tpos; |
| if (tpos) |
| tpos[0] = tpos == tpos1 ? '$' : '*'; |
| if (!spos) |
| return false; |
| if (start && spos != str0) |
| return false; |
| start = false; |
| asterisk = false; |
| } |
| return true; |
| } |
| |
| static char binary_name_cache_str[kMaxPathLength]; |
| static char process_name_cache_str[kMaxPathLength]; |
| |
| const char *GetProcessName() { |
| return process_name_cache_str; |
| } |
| |
| static uptr ReadProcessName(/*out*/ char *buf, uptr buf_len) { |
| ReadLongProcessName(buf, buf_len); |
| char *s = const_cast<char *>(StripModuleName(buf)); |
| uptr len = internal_strlen(s); |
| if (s != buf) { |
| internal_memmove(buf, s, len); |
| buf[len] = '\0'; |
| } |
| return len; |
| } |
| |
| void UpdateProcessName() { |
| ReadProcessName(process_name_cache_str, sizeof(process_name_cache_str)); |
| } |
| |
| // Call once to make sure that binary_name_cache_str is initialized |
| void CacheBinaryName() { |
| if (binary_name_cache_str[0] != '\0') |
| return; |
| ReadBinaryName(binary_name_cache_str, sizeof(binary_name_cache_str)); |
| ReadProcessName(process_name_cache_str, sizeof(process_name_cache_str)); |
| } |
| |
| uptr ReadBinaryNameCached(/*out*/char *buf, uptr buf_len) { |
| CacheBinaryName(); |
| uptr name_len = internal_strlen(binary_name_cache_str); |
| name_len = (name_len < buf_len - 1) ? name_len : buf_len - 1; |
| if (buf_len == 0) |
| return 0; |
| internal_memcpy(buf, binary_name_cache_str, name_len); |
| buf[name_len] = '\0'; |
| return name_len; |
| } |
| |
| #if !SANITIZER_GO |
| void PrintCmdline() { |
| char **argv = GetArgv(); |
| if (!argv) return; |
| Printf("\nCommand: "); |
| for (uptr i = 0; argv[i]; ++i) |
| Printf("%s ", argv[i]); |
| Printf("\n\n"); |
| } |
| #endif |
| |
| // Malloc hooks. |
| static const int kMaxMallocFreeHooks = 5; |
| struct MallocFreeHook { |
| void (*malloc_hook)(const void *, uptr); |
| void (*free_hook)(const void *); |
| }; |
| |
| static MallocFreeHook MFHooks[kMaxMallocFreeHooks]; |
| |
| void RunMallocHooks(const void *ptr, uptr size) { |
| for (int i = 0; i < kMaxMallocFreeHooks; i++) { |
| auto hook = MFHooks[i].malloc_hook; |
| if (!hook) return; |
| hook(ptr, size); |
| } |
| } |
| |
| void RunFreeHooks(const void *ptr) { |
| for (int i = 0; i < kMaxMallocFreeHooks; i++) { |
| auto hook = MFHooks[i].free_hook; |
| if (!hook) return; |
| hook(ptr); |
| } |
| } |
| |
| static int InstallMallocFreeHooks(void (*malloc_hook)(const void *, uptr), |
| void (*free_hook)(const void *)) { |
| if (!malloc_hook || !free_hook) return 0; |
| for (int i = 0; i < kMaxMallocFreeHooks; i++) { |
| if (MFHooks[i].malloc_hook == nullptr) { |
| MFHooks[i].malloc_hook = malloc_hook; |
| MFHooks[i].free_hook = free_hook; |
| return i + 1; |
| } |
| } |
| return 0; |
| } |
| |
| } // namespace __sanitizer |
| |
| using namespace __sanitizer; |
| |
| extern "C" { |
| SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_report_error_summary, |
| const char *error_summary) { |
| Printf("%s\n", error_summary); |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __sanitizer_acquire_crash_state() { |
| static atomic_uint8_t in_crash_state = {}; |
| return !atomic_exchange(&in_crash_state, 1, memory_order_relaxed); |
| } |
| |
| SANITIZER_INTERFACE_ATTRIBUTE |
| int __sanitizer_install_malloc_and_free_hooks(void (*malloc_hook)(const void *, |
| uptr), |
| void (*free_hook)(const void *)) { |
| return InstallMallocFreeHooks(malloc_hook, free_hook); |
| } |
| } // extern "C" |