1 //===-- asan_suppressions.cc ----------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file is a part of AddressSanitizer, an address sanity checker.
11 //
12 // Issue suppression and suppression-related functions.
13 //===----------------------------------------------------------------------===//
14
15 #include "asan_suppressions.h"
16
17 #include "asan_stack.h"
18 #include "sanitizer_common/sanitizer_placement_new.h"
19 #include "sanitizer_common/sanitizer_suppressions.h"
20 #include "sanitizer_common/sanitizer_symbolizer.h"
21
22 namespace __asan {
23
24 ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
25 static SuppressionContext *suppression_ctx = nullptr;
26 static const char kInterceptorName[] = "interceptor_name";
27 static const char kInterceptorViaFunction[] = "interceptor_via_fun";
28 static const char kInterceptorViaLibrary[] = "interceptor_via_lib";
29 static const char kODRViolation[] = "odr_violation";
30 static const char *kSuppressionTypes[] = {
31 kInterceptorName, kInterceptorViaFunction, kInterceptorViaLibrary,
32 kODRViolation};
33
SANITIZER_INTERFACE_WEAK_DEF(const char *,__asan_default_suppressions,void)34 SANITIZER_INTERFACE_WEAK_DEF(const char *, __asan_default_suppressions, void) {
35 return "";
36 }
37
InitializeSuppressions()38 void InitializeSuppressions() {
39 CHECK_EQ(nullptr, suppression_ctx);
40 suppression_ctx = new (suppression_placeholder) // NOLINT
41 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
42 suppression_ctx->ParseFromFile(flags()->suppressions);
43 if (&__asan_default_suppressions)
44 suppression_ctx->Parse(__asan_default_suppressions());
45 }
46
IsInterceptorSuppressed(const char * interceptor_name)47 bool IsInterceptorSuppressed(const char *interceptor_name) {
48 CHECK(suppression_ctx);
49 Suppression *s;
50 // Match "interceptor_name" suppressions.
51 return suppression_ctx->Match(interceptor_name, kInterceptorName, &s);
52 }
53
HaveStackTraceBasedSuppressions()54 bool HaveStackTraceBasedSuppressions() {
55 CHECK(suppression_ctx);
56 return suppression_ctx->HasSuppressionType(kInterceptorViaFunction) ||
57 suppression_ctx->HasSuppressionType(kInterceptorViaLibrary);
58 }
59
IsODRViolationSuppressed(const char * global_var_name)60 bool IsODRViolationSuppressed(const char *global_var_name) {
61 CHECK(suppression_ctx);
62 Suppression *s;
63 // Match "odr_violation" suppressions.
64 return suppression_ctx->Match(global_var_name, kODRViolation, &s);
65 }
66
IsStackTraceSuppressed(const StackTrace * stack)67 bool IsStackTraceSuppressed(const StackTrace *stack) {
68 if (!HaveStackTraceBasedSuppressions())
69 return false;
70
71 CHECK(suppression_ctx);
72 Symbolizer *symbolizer = Symbolizer::GetOrInit();
73 Suppression *s;
74 for (uptr i = 0; i < stack->size && stack->trace[i]; i++) {
75 uptr addr = stack->trace[i];
76
77 if (suppression_ctx->HasSuppressionType(kInterceptorViaLibrary)) {
78 // Match "interceptor_via_lib" suppressions.
79 if (const char *module_name = symbolizer->GetModuleNameForPc(addr))
80 if (suppression_ctx->Match(module_name, kInterceptorViaLibrary, &s))
81 return true;
82 }
83
84 if (suppression_ctx->HasSuppressionType(kInterceptorViaFunction)) {
85 SymbolizedStack *frames = symbolizer->SymbolizePC(addr);
86 CHECK(frames);
87 for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
88 const char *function_name = cur->info.function;
89 if (!function_name) {
90 continue;
91 }
92 // Match "interceptor_via_fun" suppressions.
93 if (suppression_ctx->Match(function_name, kInterceptorViaFunction,
94 &s)) {
95 frames->ClearAll();
96 return true;
97 }
98 }
99 frames->ClearAll();
100 }
101 }
102 return false;
103 }
104
105 } // namespace __asan
106