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//===-- sanitizer_libignore.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
//
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_APPLE || \
SANITIZER_NETBSD
#include "sanitizer_libignore.h"
#include "sanitizer_flags.h"
#include "sanitizer_posix.h"
#include "sanitizer_procmaps.h"
namespace __sanitizer {
LibIgnore::LibIgnore(LinkerInitialized) {
}
void LibIgnore::AddIgnoredLibrary(const char *name_templ) {
Lock lock(&mutex_);
if (count_ >= kMaxLibs) {
Report("%s: too many ignored libraries (max: %zu)\n", SanitizerToolName,
kMaxLibs);
Die();
}
Lib *lib = &libs_[count_++];
lib->templ = internal_strdup(name_templ);
lib->name = nullptr;
lib->real_name = nullptr;
lib->range_id = kInvalidCodeRangeId;
}
void LibIgnore::OnLibraryLoaded(const char *name) {
Lock lock(&mutex_);
// Try to match suppressions with symlink target.
InternalMmapVector<char> buf(kMaxPathLength);
if (name && internal_readlink(name, buf.data(), buf.size() - 1) > 0 &&
buf[0]) {
for (uptr i = 0; i < count_; i++) {
Lib *lib = &libs_[i];
if (!lib->loaded() && (!lib->real_name) &&
TemplateMatch(lib->templ, name))
lib->real_name = internal_strdup(buf.data());
}
}
// Scan suppressions list and find newly loaded and unloaded libraries.
ListOfModules modules;
modules.init();
for (uptr i = 0; i < count_; i++) {
Lib *lib = &libs_[i];
bool loaded = false;
for (const auto &mod : modules) {
for (const auto &range : mod.ranges()) {
if (!range.executable)
continue;
if (!TemplateMatch(lib->templ, mod.full_name()) &&
!(lib->real_name &&
internal_strcmp(lib->real_name, mod.full_name()) == 0))
continue;
if (loaded) {
Report("%s: called_from_lib suppression '%s' is matched against"
" 2 libraries: '%s' and '%s'\n",
SanitizerToolName, lib->templ, lib->name, mod.full_name());
Die();
}
loaded = true;
if (lib->loaded())
continue;
VReport(1,
"Matched called_from_lib suppression '%s' against library"
" '%s'\n",
lib->templ, mod.full_name());
lib->name = internal_strdup(mod.full_name());
const uptr idx =
atomic_load(&ignored_ranges_count_, memory_order_relaxed);
CHECK_LT(idx, ARRAY_SIZE(ignored_code_ranges_));
ignored_code_ranges_[idx].OnLoad(range.beg, range.end);
// Record the index of the ignored range.
lib->range_id = idx;
atomic_store(&ignored_ranges_count_, idx + 1, memory_order_release);
break;
}
}
if (lib->loaded() && !loaded) {
VReport(1,
"%s: library '%s' that was matched against called_from_lib"
" suppression '%s' is unloaded\n",
SanitizerToolName, lib->name, lib->templ);
// The library is unloaded so mark the ignored code range as unloaded.
ignored_code_ranges_[lib->range_id].OnUnload();
lib->range_id = kInvalidCodeRangeId;
}
}
// Track instrumented ranges.
if (track_instrumented_libs_) {
for (const auto &mod : modules) {
if (!mod.instrumented())
continue;
for (const auto &range : mod.ranges()) {
if (!range.executable)
continue;
if (IsPcInstrumented(range.beg) && IsPcInstrumented(range.end - 1))
continue;
VReport(1, "Adding instrumented range %p-%p from library '%s'\n",
(void *)range.beg, (void *)range.end, mod.full_name());
const uptr idx =
atomic_load(&instrumented_ranges_count_, memory_order_relaxed);
CHECK_LT(idx, ARRAY_SIZE(instrumented_code_ranges_));
instrumented_code_ranges_[idx].OnLoad(range.beg, range.end);
atomic_store(&instrumented_ranges_count_, idx + 1,
memory_order_release);
}
}
}
}
void LibIgnore::OnLibraryUnloaded() {
OnLibraryLoaded(nullptr);
}
} // namespace __sanitizer
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_APPLE ||
// SANITIZER_NETBSD
|
