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