forked from OSchip/llvm-project
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
//===-- sanitizer_libignore.cc --------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_LINUX
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#include "sanitizer_libignore.h"
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#include "sanitizer_flags.h"
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#include "sanitizer_procmaps.h"
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namespace __sanitizer {
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LibIgnore::LibIgnore(LinkerInitialized) {
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}
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void LibIgnore::Init(const SuppressionContext &supp) {
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BlockingMutexLock lock(&mutex_);
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CHECK_EQ(count_, 0);
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const uptr n = supp.SuppressionCount();
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for (uptr i = 0; i < n; i++) {
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const Suppression *s = supp.SuppressionAt(i);
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if (s->type != SuppressionLib)
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continue;
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if (count_ >= kMaxLibs) {
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Report("%s: too many called_from_lib suppressions (max: %d)\n",
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SanitizerToolName, kMaxLibs);
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Die();
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}
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Lib *lib = &libs_[count_++];
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lib->templ = internal_strdup(s->templ);
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lib->name = 0;
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lib->loaded = false;
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}
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}
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void LibIgnore::OnLibraryLoaded(const char *name) {
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BlockingMutexLock lock(&mutex_);
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// Try to match suppressions with symlink target.
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InternalScopedBuffer<char> buf(4096);
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if (name != 0 && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
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buf.data()[0]) {
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for (uptr i = 0; i < count_; i++) {
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Lib *lib = &libs_[i];
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if (!lib->loaded && lib->real_name == 0 &&
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TemplateMatch(lib->templ, name))
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lib->real_name = internal_strdup(buf.data());
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}
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}
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// Scan suppressions list and find newly loaded and unloaded libraries.
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MemoryMappingLayout proc_maps(/*cache_enabled*/false);
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InternalScopedBuffer<char> module(4096);
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for (uptr i = 0; i < count_; i++) {
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Lib *lib = &libs_[i];
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bool loaded = false;
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proc_maps.Reset();
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uptr b, e, off, prot;
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while (proc_maps.Next(&b, &e, &off, module.data(), module.size(), &prot)) {
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if ((prot & MemoryMappingLayout::kProtectionExecute) == 0)
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continue;
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if (TemplateMatch(lib->templ, module.data()) ||
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(lib->real_name != 0 &&
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internal_strcmp(lib->real_name, module.data()) == 0)) {
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if (loaded) {
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Report("%s: called_from_lib suppression '%s' is matched against"
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" 2 libraries: '%s' and '%s'\n",
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SanitizerToolName, lib->templ, lib->name, module.data());
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Die();
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}
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loaded = true;
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if (lib->loaded)
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continue;
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VReport(1,
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"Matched called_from_lib suppression '%s' against library"
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" '%s'\n",
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lib->templ, module.data());
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lib->loaded = true;
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lib->name = internal_strdup(module.data());
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const uptr idx = atomic_load(&loaded_count_, memory_order_relaxed);
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code_ranges_[idx].begin = b;
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code_ranges_[idx].end = e;
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atomic_store(&loaded_count_, idx + 1, memory_order_release);
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}
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}
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if (lib->loaded && !loaded) {
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Report("%s: library '%s' that was matched against called_from_lib"
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" suppression '%s' is unloaded\n",
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SanitizerToolName, lib->name, lib->templ);
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Die();
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}
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}
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}
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void LibIgnore::OnLibraryUnloaded() {
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OnLibraryLoaded(0);
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}
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} // namespace __sanitizer
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#endif // #if SANITIZER_LINUX
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