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//===-- asan_suppressions.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Issue suppression and suppression-related functions.
//===----------------------------------------------------------------------===//
#include "asan_suppressions.h"
#include "asan_stack.h"
#include "sanitizer_common/sanitizer_placement_new.h"
#include "sanitizer_common/sanitizer_suppressions.h"
#include "sanitizer_common/sanitizer_symbolizer.h"
namespace __asan {
ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
static SuppressionContext *suppression_ctx = nullptr;
static const char kInterceptorName[] = "interceptor_name";
static const char kInterceptorViaFunction[] = "interceptor_via_fun";
static const char kInterceptorViaLibrary[] = "interceptor_via_lib";
static const char kODRViolation[] = "odr_violation";
static const char *kSuppressionTypes[] = {
kInterceptorName, kInterceptorViaFunction, kInterceptorViaLibrary,
kODRViolation};
SANITIZER_INTERFACE_WEAK_DEF(const char *, __asan_default_suppressions, void) {
return "";
}
void InitializeSuppressions() {
CHECK_EQ(nullptr, suppression_ctx);
suppression_ctx = new (suppression_placeholder)
SuppressionContext(kSuppressionTypes, ARRAY_SIZE(kSuppressionTypes));
suppression_ctx->ParseFromFile(flags()->suppressions);
if (&__asan_default_suppressions)
suppression_ctx->Parse(__asan_default_suppressions());
}
bool IsInterceptorSuppressed(const char *interceptor_name) {
CHECK(suppression_ctx);
Suppression *s;
// Match "interceptor_name" suppressions.
return suppression_ctx->Match(interceptor_name, kInterceptorName, &s);
}
bool HaveStackTraceBasedSuppressions() {
CHECK(suppression_ctx);
return suppression_ctx->HasSuppressionType(kInterceptorViaFunction) ||
suppression_ctx->HasSuppressionType(kInterceptorViaLibrary);
}
bool IsODRViolationSuppressed(const char *global_var_name) {
CHECK(suppression_ctx);
Suppression *s;
// Match "odr_violation" suppressions.
return suppression_ctx->Match(global_var_name, kODRViolation, &s);
}
bool IsStackTraceSuppressed(const StackTrace *stack) {
if (!HaveStackTraceBasedSuppressions())
return false;
CHECK(suppression_ctx);
Symbolizer *symbolizer = Symbolizer::GetOrInit();
Suppression *s;
for (uptr i = 0; i < stack->size && stack->trace[i]; i++) {
uptr addr = stack->trace[i];
if (suppression_ctx->HasSuppressionType(kInterceptorViaLibrary)) {
// Match "interceptor_via_lib" suppressions.
if (const char *module_name = symbolizer->GetModuleNameForPc(addr))
if (suppression_ctx->Match(module_name, kInterceptorViaLibrary, &s))
return true;
}
if (suppression_ctx->HasSuppressionType(kInterceptorViaFunction)) {
SymbolizedStack *frames = symbolizer->SymbolizePC(addr);
CHECK(frames);
for (SymbolizedStack *cur = frames; cur; cur = cur->next) {
const char *function_name = cur->info.function;
if (!function_name) {
continue;
}
// Match "interceptor_via_fun" suppressions.
if (suppression_ctx->Match(function_name, kInterceptorViaFunction,
&s)) {
frames->ClearAll();
return true;
}
}
frames->ClearAll();
}
}
return false;
}
} // namespace __asan
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