mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
134 lines
3.2 KiB
C++
134 lines
3.2 KiB
C++
/// This code was based on the code by Fedor Korotkiy (prime@yandex-team.ru) for YT product in Yandex.
|
|
|
|
#if defined(__has_feature)
|
|
#if __has_feature(address_sanitizer)
|
|
#define ADDRESS_SANITIZER 1
|
|
#endif
|
|
#if __has_feature(thread_sanitizer)
|
|
#define THREAD_SANITIZER 1
|
|
#endif
|
|
#else
|
|
#if defined(__SANITIZE_ADDRESS__)
|
|
#define ADDRESS_SANITIZER 1
|
|
#endif
|
|
#if defined(__SANITIZE_THREAD__)
|
|
#define THREAD_SANITIZER 1
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(__linux__) && !defined(THREAD_SANITIZER)
|
|
#define USE_PHDR_CACHE 1
|
|
#endif
|
|
|
|
#define __msan_unpoison(X, Y)
|
|
#if defined(__has_feature)
|
|
# if __has_feature(memory_sanitizer)
|
|
# undef __msan_unpoison
|
|
# include <sanitizer/msan_interface.h>
|
|
# endif
|
|
#endif
|
|
|
|
/// Thread Sanitizer uses dl_iterate_phdr function on initialization and fails if we provide our own.
|
|
#ifdef USE_PHDR_CACHE
|
|
|
|
#include <link.h>
|
|
#include <dlfcn.h>
|
|
#include <vector>
|
|
#include <atomic>
|
|
#include <cstddef>
|
|
#include <stdexcept>
|
|
|
|
|
|
namespace
|
|
{
|
|
|
|
// This is adapted from
|
|
// https://github.com/scylladb/seastar/blob/master/core/exception_hacks.hh
|
|
// https://github.com/scylladb/seastar/blob/master/core/exception_hacks.cc
|
|
|
|
using DLIterateFunction = int (*) (int (*callback) (dl_phdr_info * info, size_t size, void * data), void * data);
|
|
|
|
DLIterateFunction getOriginalDLIteratePHDR()
|
|
{
|
|
void * func = dlsym(RTLD_NEXT, "dl_iterate_phdr");
|
|
if (!func)
|
|
throw std::runtime_error("Cannot find dl_iterate_phdr function with dlsym");
|
|
return reinterpret_cast<DLIterateFunction>(func);
|
|
}
|
|
|
|
|
|
using PHDRCache = std::vector<dl_phdr_info>;
|
|
std::atomic<PHDRCache *> phdr_cache {};
|
|
|
|
}
|
|
|
|
|
|
extern "C"
|
|
#ifndef __clang__
|
|
[[gnu::visibility("default")]]
|
|
[[gnu::externally_visible]]
|
|
#endif
|
|
int dl_iterate_phdr(int (*callback) (dl_phdr_info * info, size_t size, void * data), void * data)
|
|
{
|
|
auto current_phdr_cache = phdr_cache.load();
|
|
if (!current_phdr_cache)
|
|
{
|
|
// Cache is not yet populated, pass through to the original function.
|
|
return getOriginalDLIteratePHDR()(callback, data);
|
|
}
|
|
|
|
int result = 0;
|
|
for (auto & entry : *current_phdr_cache)
|
|
{
|
|
result = callback(&entry, offsetof(dl_phdr_info, dlpi_adds), data);
|
|
if (result != 0)
|
|
break;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
extern "C"
|
|
{
|
|
#ifdef ADDRESS_SANITIZER
|
|
void __lsan_ignore_object(const void *);
|
|
#else
|
|
void __lsan_ignore_object(const void *) {}
|
|
#endif
|
|
}
|
|
|
|
|
|
void updatePHDRCache()
|
|
{
|
|
// Fill out ELF header cache for access without locking.
|
|
// This assumes no dynamic object loading/unloading after this point
|
|
|
|
PHDRCache * new_phdr_cache = new PHDRCache;
|
|
getOriginalDLIteratePHDR()([] (dl_phdr_info * info, size_t /*size*/, void * data)
|
|
{
|
|
// `info` is created by dl_iterate_phdr, which is a non-instrumented
|
|
// libc function, so we have to unpoison it manually.
|
|
__msan_unpoison(info, sizeof(*info));
|
|
|
|
reinterpret_cast<PHDRCache *>(data)->push_back(*info);
|
|
return 0;
|
|
}, new_phdr_cache);
|
|
phdr_cache.store(new_phdr_cache);
|
|
|
|
/// Memory is intentionally leaked.
|
|
__lsan_ignore_object(new_phdr_cache);
|
|
}
|
|
|
|
|
|
bool hasPHDRCache()
|
|
{
|
|
return phdr_cache.load() != nullptr;
|
|
}
|
|
|
|
#else
|
|
|
|
void updatePHDRCache() {}
|
|
bool hasPHDRCache() { return false; }
|
|
|
|
#endif
|