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
21namespace __asan {
22
23ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
24static SuppressionContext *suppression_ctx = nullptr;
25static const char kInterceptorName[] = "interceptor_name";
26static const char kInterceptorViaFunction[] = "interceptor_via_fun";
27static const char kInterceptorViaLibrary[] = "interceptor_via_lib";
28static const char kODRViolation[] = "odr_violation";
29static const char *kSuppressionTypes[] = {
30 kInterceptorName, kInterceptorViaFunction, kInterceptorViaLibrary,
31 kODRViolation};
32
33SANITIZER_INTERFACE_WEAK_DEF(const char *, __asan_default_suppressions, void) {
34 return "";
35}
36
37void InitializeSuppressions() {
38 CHECK_EQ(nullptr, suppression_ctx);
39 suppression_ctx = new (suppression_placeholder)
40 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
41 suppression_ctx->ParseFromFile(filename: flags()->suppressions);
42 if (&__asan_default_suppressions)
43 suppression_ctx->Parse(str: __asan_default_suppressions());
44}
45
46bool IsInterceptorSuppressed(const char *interceptor_name) {
47 CHECK(suppression_ctx);
48 Suppression *s;
49 // Match "interceptor_name" suppressions.
50 return suppression_ctx->Match(str: interceptor_name, type: kInterceptorName, s: &s);
51}
52
53bool HaveStackTraceBasedSuppressions() {
54 CHECK(suppression_ctx);
55 return suppression_ctx->HasSuppressionType(type: kInterceptorViaFunction) ||
56 suppression_ctx->HasSuppressionType(type: kInterceptorViaLibrary);
57}
58
59bool IsODRViolationSuppressed(const char *global_var_name) {
60 CHECK(suppression_ctx);
61 Suppression *s;
62 // Match "odr_violation" suppressions.
63 return suppression_ctx->Match(str: global_var_name, type: kODRViolation, s: &s);
64}
65
66bool IsStackTraceSuppressed(const StackTrace *stack) {
67 if (!HaveStackTraceBasedSuppressions())
68 return false;
69
70 CHECK(suppression_ctx);
71 Symbolizer *symbolizer = Symbolizer::GetOrInit();
72 Suppression *s;
73 for (uptr i = 0; i < stack->size && stack->trace[i]; i++) {
74 uptr addr = stack->trace[i];
75
76 if (suppression_ctx->HasSuppressionType(type: kInterceptorViaLibrary)) {
77 // Match "interceptor_via_lib" suppressions.
78 if (const char *module_name = symbolizer->GetModuleNameForPc(pc: addr))
79 if (suppression_ctx->Match(str: module_name, type: kInterceptorViaLibrary, s: &s))
80 return true;
81 }
82
83 if (suppression_ctx->HasSuppressionType(type: kInterceptorViaFunction)) {
84 SymbolizedStackHolder symbolized_stack(symbolizer->SymbolizePC(address: addr));
85 const SymbolizedStack *frames = symbolized_stack.get();
86 CHECK(frames);
87 for (const 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(str: function_name, type: kInterceptorViaFunction,
94 s: &s)) {
95 return true;
96 }
97 }
98 }
99 }
100 return false;
101}
102
103} // namespace __asan
104

source code of compiler-rt/lib/asan/asan_suppressions.cpp