1 //=-- lsan_posix.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 common to POSIX-like systems. 11 // 12 //===---------------------------------------------------------------------===// 13 14 #include "sanitizer_common/sanitizer_platform.h" 15 16 #if SANITIZER_POSIX 17 #include "lsan.h" 18 #include "lsan_allocator.h" 19 #include "lsan_thread.h" 20 #include "sanitizer_common/sanitizer_stacktrace.h" 21 #include "sanitizer_common/sanitizer_tls_get_addr.h" 22 23 namespace __lsan { 24 25 ThreadContext::ThreadContext(int tid) : ThreadContextLsanBase(tid) {} 26 27 struct OnStartedArgs { 28 uptr stack_begin; 29 uptr stack_end; 30 uptr cache_begin; 31 uptr cache_end; 32 uptr tls_begin; 33 uptr tls_end; 34 DTLS *dtls; 35 }; 36 37 void ThreadContext::OnStarted(void *arg) { 38 auto args = reinterpret_cast<const OnStartedArgs *>(arg); 39 stack_begin_ = args->stack_begin; 40 stack_end_ = args->stack_end; 41 tls_begin_ = args->tls_begin; 42 tls_end_ = args->tls_end; 43 cache_begin_ = args->cache_begin; 44 cache_end_ = args->cache_end; 45 dtls_ = args->dtls; 46 } 47 48 void ThreadStart(u32 tid, tid_t os_id, ThreadType thread_type) { 49 OnStartedArgs args; 50 uptr stack_size = 0; 51 uptr tls_size = 0; 52 GetThreadStackAndTls(tid == kMainTid, &args.stack_begin, &stack_size, 53 &args.tls_begin, &tls_size); 54 args.stack_end = args.stack_begin + stack_size; 55 args.tls_end = args.tls_begin + tls_size; 56 GetAllocatorCacheRange(&args.cache_begin, &args.cache_end); 57 args.dtls = DTLS_Get(); 58 ThreadContextLsanBase::ThreadStart(tid, os_id, thread_type, &args); 59 } 60 61 bool GetThreadRangesLocked(tid_t os_id, uptr *stack_begin, uptr *stack_end, 62 uptr *tls_begin, uptr *tls_end, uptr *cache_begin, 63 uptr *cache_end, DTLS **dtls) { 64 ThreadContext *context = static_cast<ThreadContext *>( 65 GetLsanThreadRegistryLocked()->FindThreadContextByOsIDLocked(os_id)); 66 if (!context) 67 return false; 68 *stack_begin = context->stack_begin(); 69 *stack_end = context->stack_end(); 70 *tls_begin = context->tls_begin(); 71 *tls_end = context->tls_end(); 72 *cache_begin = context->cache_begin(); 73 *cache_end = context->cache_end(); 74 *dtls = context->dtls(); 75 return true; 76 } 77 78 void InitializeMainThread() { 79 u32 tid = ThreadCreate(kMainTid, true); 80 CHECK_EQ(tid, kMainTid); 81 ThreadStart(tid, GetTid()); 82 } 83 84 static void OnStackUnwind(const SignalContext &sig, const void *, 85 BufferedStackTrace *stack) { 86 stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context, 87 common_flags()->fast_unwind_on_fatal); 88 } 89 90 void LsanOnDeadlySignal(int signo, void *siginfo, void *context) { 91 HandleDeadlySignal(siginfo, context, GetCurrentThread(), &OnStackUnwind, 92 nullptr); 93 } 94 95 void InstallAtExitCheckLeaks() { 96 if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) 97 Atexit(DoLeakCheck); 98 } 99 100 } // namespace __lsan 101 102 #endif // SANITIZER_POSIX 103