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 ThreadContextLsanBase::OnStarted(arg); 50 auto args = reinterpret_cast<const OnStartedArgs *>(arg); 51 cache_begin_ = args->cache_begin; 52 cache_end_ = args->cache_end; 53 } 54 55 void ThreadStart(u32 tid) { 56 OnStartedArgs args; 57 GetAllocatorCacheRange(&args.cache_begin, &args.cache_end); 58 CHECK_EQ(args.cache_end - args.cache_begin, sizeof(AllocatorCache)); 59 ThreadContextLsanBase::ThreadStart(tid, GetTid(), ThreadType::Regular, &args); 60 } 61 62 void InitializeMainThread() { 63 OnCreatedArgs args; 64 __sanitizer::GetThreadStackTopAndBottom(true, &args.stack_end, 65 &args.stack_begin); 66 u32 tid = ThreadCreate(kMainTid, true, &args); 67 CHECK_EQ(tid, 0); 68 ThreadStart(tid); 69 } 70 71 void GetAllThreadAllocatorCachesLocked(InternalMmapVector<uptr> *caches) { 72 GetLsanThreadRegistryLocked()->RunCallbackForEachThreadLocked( 73 [](ThreadContextBase *tctx, void *arg) { 74 auto ctx = static_cast<ThreadContext *>(tctx); 75 static_cast<decltype(caches)>(arg)->push_back(ctx->cache_begin()); 76 }, 77 caches); 78 } 79 80 // On Fuchsia, leak detection is done by a special hook after atexit hooks. 81 // So this doesn't install any atexit hook like on other platforms. 82 void InstallAtExitCheckLeaks() {} 83 void InstallAtForkHandler() {} 84 85 // ASan defines this to check its `halt_on_error` flag. 86 bool UseExitcodeOnLeak() { return true; } 87 88 } // namespace __lsan 89 90 // These are declared (in extern "C") by <zircon/sanitizer.h>. 91 // The system runtime will call our definitions directly. 92 93 // This is called before each thread creation is attempted. So, in 94 // its first call, the calling thread is the initial and sole thread. 95 void *__sanitizer_before_thread_create_hook(thrd_t thread, bool detached, 96 const char *name, void *stack_base, 97 size_t stack_size) { 98 ENSURE_LSAN_INITED; 99 EnsureMainThreadIDIsCorrect(); 100 OnCreatedArgs args; 101 args.stack_begin = reinterpret_cast<uptr>(stack_base); 102 args.stack_end = args.stack_begin + stack_size; 103 u32 parent_tid = GetCurrentThreadId(); 104 u32 tid = ThreadCreate(parent_tid, detached, &args); 105 return reinterpret_cast<void *>(static_cast<uptr>(tid)); 106 } 107 108 // This is called after creating a new thread (in the creating thread), 109 // with the pointer returned by __sanitizer_before_thread_create_hook (above). 110 void __sanitizer_thread_create_hook(void *hook, thrd_t thread, int error) { 111 u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); 112 // On success, there is nothing to do here. 113 if (error != thrd_success) { 114 // Clean up the thread registry for the thread creation that didn't happen. 115 GetLsanThreadRegistryLocked()->FinishThread(tid); 116 } 117 } 118 119 // This is called in the newly-created thread before it runs anything else, 120 // with the pointer returned by __sanitizer_before_thread_create_hook (above). 121 void __sanitizer_thread_start_hook(void *hook, thrd_t self) { 122 u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); 123 ThreadStart(tid); 124 } 125 126 // Each thread runs this just before it exits, 127 // with the pointer returned by BeforeThreadCreateHook (above). 128 // All per-thread destructors have already been called. 129 void __sanitizer_thread_exit_hook(void *hook, thrd_t self) { ThreadFinish(); } 130 131 #endif // SANITIZER_FUCHSIA 132