1 //===-- asan_suppressions.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 AddressSanitizer, an address sanity checker. 10 // 11 // Issue suppression and suppression-related functions. 12 //===----------------------------------------------------------------------===// 13 14 #include "asan_suppressions.h" 15 16 #include "asan_stack.h" 17 #include "sanitizer_common/sanitizer_placement_new.h" 18 #include "sanitizer_common/sanitizer_suppressions.h" 19 #include "sanitizer_common/sanitizer_symbolizer.h" 20 21 namespace __asan { 22 23 alignas(64) static char suppression_placeholder[sizeof(SuppressionContext)]; 24 static SuppressionContext *suppression_ctx = nullptr; 25 static const char kInterceptorName[] = "interceptor_name"; 26 static const char kInterceptorViaFunction[] = "interceptor_via_fun"; 27 static const char kInterceptorViaLibrary[] = "interceptor_via_lib"; 28 static const char kODRViolation[] = "odr_violation"; 29 static const char *kSuppressionTypes[] = { 30 kInterceptorName, kInterceptorViaFunction, kInterceptorViaLibrary, 31 kODRViolation}; 32 33 SANITIZER_INTERFACE_WEAK_DEF(const char *, __asan_default_suppressions, void) { 34 return ""; 35 } 36 37 void InitializeSuppressions() { 38 CHECK_EQ(nullptr, suppression_ctx); 39 suppression_ctx = new (suppression_placeholder) 40 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes)); 41 suppression_ctx->ParseFromFile(flags()->suppressions); 42 suppression_ctx->Parse(__asan_default_suppressions()); 43 } 44 45 bool IsInterceptorSuppressed(const char *interceptor_name) { 46 CHECK(suppression_ctx); 47 Suppression *s; 48 // Match "interceptor_name" suppressions. 49 return suppression_ctx->Match(interceptor_name, kInterceptorName, &s); 50 } 51 52 bool HaveStackTraceBasedSuppressions() { 53 CHECK(suppression_ctx); 54 return suppression_ctx->HasSuppressionType(kInterceptorViaFunction) || 55 suppression_ctx->HasSuppressionType(kInterceptorViaLibrary); 56 } 57 58 bool IsODRViolationSuppressed(const char *global_var_name) { 59 CHECK(suppression_ctx); 60 Suppression *s; 61 // Match "odr_violation" suppressions. 62 return suppression_ctx->Match(global_var_name, kODRViolation, &s); 63 } 64 65 bool IsStackTraceSuppressed(const StackTrace *stack) { 66 if (!HaveStackTraceBasedSuppressions()) 67 return false; 68 69 CHECK(suppression_ctx); 70 Symbolizer *symbolizer = Symbolizer::GetOrInit(); 71 Suppression *s; 72 for (uptr i = 0; i < stack->size && stack->trace[i]; i++) { 73 uptr addr = stack->trace[i]; 74 75 if (suppression_ctx->HasSuppressionType(kInterceptorViaLibrary)) { 76 // Match "interceptor_via_lib" suppressions. 77 if (const char *module_name = symbolizer->GetModuleNameForPc(addr)) 78 if (suppression_ctx->Match(module_name, kInterceptorViaLibrary, &s)) 79 return true; 80 } 81 82 if (suppression_ctx->HasSuppressionType(kInterceptorViaFunction)) { 83 SymbolizedStackHolder symbolized_stack(symbolizer->SymbolizePC(addr)); 84 const SymbolizedStack *frames = symbolized_stack.get(); 85 CHECK(frames); 86 for (const SymbolizedStack *cur = frames; cur; cur = cur->next) { 87 const char *function_name = cur->info.function; 88 if (!function_name) { 89 continue; 90 } 91 // Match "interceptor_via_fun" suppressions. 92 if (suppression_ctx->Match(function_name, kInterceptorViaFunction, 93 &s)) { 94 return true; 95 } 96 } 97 } 98 } 99 return false; 100 } 101 102 } // namespace __asan 103