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 84 // ASan defines this to check its `halt_on_error` flag. 85 bool UseExitcodeOnLeak() { return true; } 86 87 } // namespace __lsan 88 89 // These are declared (in extern "C") by <zircon/sanitizer.h>. 90 // The system runtime will call our definitions directly. 91 92 // This is called before each thread creation is attempted. So, in 93 // its first call, the calling thread is the initial and sole thread. 94 void *__sanitizer_before_thread_create_hook(thrd_t thread, bool detached, 95 const char *name, void *stack_base, 96 size_t stack_size) { 97 ENSURE_LSAN_INITED; 98 EnsureMainThreadIDIsCorrect(); 99 OnCreatedArgs args; 100 args.stack_begin = reinterpret_cast<uptr>(stack_base); 101 args.stack_end = args.stack_begin + stack_size; 102 u32 parent_tid = GetCurrentThreadId(); 103 u32 tid = ThreadCreate(parent_tid, detached, &args); 104 return reinterpret_cast<void *>(static_cast<uptr>(tid)); 105 } 106 107 // This is called after creating a new thread (in the creating thread), 108 // with the pointer returned by __sanitizer_before_thread_create_hook (above). 109 void __sanitizer_thread_create_hook(void *hook, thrd_t thread, int error) { 110 u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); 111 // On success, there is nothing to do here. 112 if (error != thrd_success) { 113 // Clean up the thread registry for the thread creation that didn't happen. 114 GetLsanThreadRegistryLocked()->FinishThread(tid); 115 } 116 } 117 118 // This is called in the newly-created thread before it runs anything else, 119 // with the pointer returned by __sanitizer_before_thread_create_hook (above). 120 void __sanitizer_thread_start_hook(void *hook, thrd_t self) { 121 u32 tid = static_cast<u32>(reinterpret_cast<uptr>(hook)); 122 ThreadStart(tid); 123 } 124 125 // Each thread runs this just before it exits, 126 // with the pointer returned by BeforeThreadCreateHook (above). 127 // All per-thread destructors have already been called. 128 void __sanitizer_thread_exit_hook(void *hook, thrd_t self) { ThreadFinish(); } 129 130 #endif // SANITIZER_FUCHSIA 131