1 //===-- nsan_suppressions.cc ----------------------------------------------===//
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 #include "nsan_suppressions.h"
10 #include "nsan_flags.h"
11 #include "sanitizer_common/sanitizer_placement_new.h"
12 #include "sanitizer_common/sanitizer_stacktrace.h"
13 #include "sanitizer_common/sanitizer_symbolizer.h"
14
15 using namespace __sanitizer;
16 using namespace __nsan;
17
SANITIZER_INTERFACE_WEAK_DEF(const char *,__nsan_default_suppressions,void)18 SANITIZER_INTERFACE_WEAK_DEF(const char *, __nsan_default_suppressions, void) {
19 return 0;
20 }
21
22 const char kSuppressionFcmp[] = "fcmp";
23 const char kSuppressionConsistency[] = "consistency";
24
25 alignas(64) static char suppression_placeholder[sizeof(SuppressionContext)];
26 static SuppressionContext *suppression_ctx;
27
28 // The order should match the enum CheckKind.
29 static const char *kSuppressionTypes[] = {kSuppressionFcmp,
30 kSuppressionConsistency};
31
InitializeSuppressions()32 void __nsan::InitializeSuppressions() {
33 CHECK_EQ(nullptr, suppression_ctx);
34 suppression_ctx = new (suppression_placeholder)
35 SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
36 suppression_ctx->ParseFromFile(flags().suppressions);
37 suppression_ctx->Parse(__nsan_default_suppressions());
38 }
39
GetSuppressionForAddr(uptr addr,const char * suppr_type)40 static Suppression *GetSuppressionForAddr(uptr addr, const char *suppr_type) {
41 Suppression *s = nullptr;
42
43 // Suppress by module name.
44 SuppressionContext *suppressions = suppression_ctx;
45 if (const char *moduleName =
46 Symbolizer::GetOrInit()->GetModuleNameForPc(addr)) {
47 if (suppressions->Match(moduleName, suppr_type, &s))
48 return s;
49 }
50
51 // Suppress by file or function name.
52 SymbolizedStack *frames = Symbolizer::GetOrInit()->SymbolizePC(addr);
53 for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
54 if (suppressions->Match(cur->info.function, suppr_type, &s) ||
55 suppressions->Match(cur->info.file, suppr_type, &s)) {
56 break;
57 }
58 }
59 frames->ClearAll();
60 return s;
61 }
62
GetSuppressionForStack(const StackTrace * stack,CheckKind k)63 Suppression *__nsan::GetSuppressionForStack(const StackTrace *stack,
64 CheckKind k) {
65 for (uptr i = 0, e = stack->size; i < e; i++) {
66 Suppression *s = GetSuppressionForAddr(
67 StackTrace::GetPreviousInstructionPc(stack->trace[i]),
68 kSuppressionTypes[static_cast<int>(k)]);
69 if (s)
70 return s;
71 }
72 return nullptr;
73 }
74