1 //=-- lsan_fuchsia.cpp ---------------------------------------------------===// 2 // 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 6 // 7 //===---------------------------------------------------------------------===// 8 // 9 // This file is a part of LeakSanitizer. 10 // Standalone LSan RTL code specific to Fuchsia. 11 // 12 //===---------------------------------------------------------------------===// 13 14 #include "sanitizer_common/sanitizer_platform.h" 15 16 #if SANITIZER_FUCHSIA 17 #include <zircon/sanitizer.h> 18 19 #include "lsan.h" 20 #include "lsan_allocator.h" 21 22 using namespace __lsan; 23 24 namespace __lsan { 25 26 void LsanOnDeadlySignal(int signo, void *siginfo, void *context) {} 27 28 ThreadContext::ThreadContext(int tid) : ThreadContextLsanBase(tid) {} 29 30 struct OnCreatedArgs { 31 uptr stack_begin, stack_end; 32 }; 33 34 // On Fuchsia, the stack bounds of a new thread are available before 35 // the thread itself has started running. 36 void ThreadContext::OnCreated(void *arg) { 37 // Stack bounds passed through from __sanitizer_before_thread_create_hook 38 // or InitializeMainThread. 39 auto args = reinterpret_cast<const OnCreatedArgs *>(arg); 40 stack_begin_ = args->stack_begin; 41 stack_end_ = args->stack_end; 42 } 43 44 struct OnStartedArgs { 45 uptr cache_begin, cache_end; 46 }; 47 48 void ThreadContext::OnStarted(void *arg) { 49 auto args = reinterpret_cast<const OnStartedArgs *>(arg); 50 cache_begin_ = args->cache_begin; 51 cache_end_ = args->cache_end; 52 } 53 54 void ThreadStart(u32 tid) { 55 OnStartedArgs args; 56 GetAllocatorCacheRange(&args.cache_begin, &args.cache_end); 57 CHECK_EQ(args.cache_end - args.cache_begin, sizeof(AllocatorCache)); 58 ThreadContextLsanBase::ThreadStart(tid, GetTid(), ThreadType::Regular, &args); 59 } 60 61 void InitializeMainThread() { 62 OnCreatedArgs args; 63 __sanitizer::GetThreadStackTopAndBottom(true, &args.stack_end, 64 &args.stack_begin); 65 u32 tid = ThreadCreate(kMainTid, true, &args); 66 CHECK_EQ(tid, 0); 67 ThreadStart(tid); 68 } 69 70 void GetAllThreadAllocatorCachesLocked(InternalMmapVector<uptr> *caches) { 71 GetLsanThreadRegistryLocked()->RunCallbackForEachThreadLocked( 72 [](ThreadContextBase *tctx, void *arg) { 73 auto ctx = static_cast<ThreadContext *>(tctx); 74 static_cast<decltype(caches)>(arg)->push_back(ctx->cache_begin()); 75 }, 76 caches); 77 } 78 79 // On Fuchsia, leak detection is done by a special hook after atexit hooks. 80 // So this doesn't install any atexit hook like on other platforms. 81 void InstallAtExitCheckLeaks() {} 82 83 // ASan defines this to check its `halt_on_error` flag. 84 bool UseExitcodeOnLeak() { return true; } 85 86 } // namespace __lsan 87 88 // These are declared (in extern "C") by <zircon/sanitizer.h>. 89 // The system runtime will call our definitions directly. 90 91 // This is called before each thread creation is attempted. So, in 92 // its first call, the calling thread is the initial and sole thread. 93 void *__sanitizer_before_thread_create_hook(thrd_t thread, bool detached, 94 const char *name, void *stack_base, 95 size_t stack_size) { 96 ENSURE_LSAN_INITED; 97 EnsureMainThreadIDIsCorrect(); 98 OnCreatedArgs args; 99 args.stack_begin = reinterpret_cast<uptr>(stack_base); 100 args.stack_end = args.stack_begin + stack_size; 101 u32 parent_tid = GetCurrentThread(); 102 u32 tid = ThreadCreate(parent_tid, detached, &args); 103 return reinterpret_cast<void *>(static_cast<uptr>(tid)); 104 } 105 106 // This is called after creating a new thread (in the creating thread), 107 // with the pointer returned by __sanitizer_before_thread_create_hook (above). 108 void __sanitizer_thread_create_hook(void *hook, thrd_t thread, int error) { 109 u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); 110 // On success, there is nothing to do here. 111 if (error != thrd_success) { 112 // Clean up the thread registry for the thread creation that didn't happen. 113 GetLsanThreadRegistryLocked()->FinishThread(tid); 114 } 115 } 116 117 // This is called in the newly-created thread before it runs anything else, 118 // with the pointer returned by __sanitizer_before_thread_create_hook (above). 119 void __sanitizer_thread_start_hook(void *hook, thrd_t self) { 120 u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); 121 ThreadStart(tid); 122 } 123 124 // Each thread runs this just before it exits, 125 // with the pointer returned by BeforeThreadCreateHook (above). 126 // All per-thread destructors have already been called. 127 void __sanitizer_thread_exit_hook(void *hook, thrd_t self) { ThreadFinish(); } 128 129 #endif // SANITIZER_FUCHSIA 130