forked from OSchip/llvm-project
196 lines
5.5 KiB
C++
196 lines
5.5 KiB
C++
//===-- msan_linux.cc -----------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is a part of MemorySanitizer.
|
|
//
|
|
// Linux- and FreeBSD-specific code.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "sanitizer_common/sanitizer_platform.h"
|
|
#if SANITIZER_FREEBSD || SANITIZER_LINUX
|
|
|
|
#include "msan.h"
|
|
#include "msan_thread.h"
|
|
|
|
#include <elf.h>
|
|
#include <link.h>
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <unwind.h>
|
|
#include <execinfo.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include "sanitizer_common/sanitizer_common.h"
|
|
#include "sanitizer_common/sanitizer_procmaps.h"
|
|
|
|
namespace __msan {
|
|
|
|
void ReportMapRange(const char *descr, uptr beg, uptr size) {
|
|
if (size > 0) {
|
|
uptr end = beg + size - 1;
|
|
VPrintf(1, "%s : %p - %p\n", descr, beg, end);
|
|
}
|
|
}
|
|
|
|
static bool CheckMemoryRangeAvailability(uptr beg, uptr size) {
|
|
if (size > 0) {
|
|
uptr end = beg + size - 1;
|
|
if (!MemoryRangeIsAvailable(beg, end)) {
|
|
Printf("FATAL: Memory range %p - %p is not available.\n", beg, end);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool ProtectMemoryRange(uptr beg, uptr size) {
|
|
if (size > 0) {
|
|
uptr end = beg + size - 1;
|
|
if (!Mprotect(beg, size)) {
|
|
Printf("FATAL: Cannot protect memory range %p - %p.\n", beg, end);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void CheckMemoryLayoutSanity() {
|
|
uptr prev_end = 0;
|
|
for (unsigned i = 0; i < kMemoryLayoutSize; ++i) {
|
|
uptr start = kMemoryLayout[i].start;
|
|
uptr end = kMemoryLayout[i].end;
|
|
MappingDesc::Type type = kMemoryLayout[i].type;
|
|
CHECK_LT(start, end);
|
|
CHECK_EQ(prev_end, start);
|
|
CHECK(addr_is_type(start, type));
|
|
CHECK(addr_is_type((start + end) / 2, type));
|
|
CHECK(addr_is_type(end - 1, type));
|
|
if (type == MappingDesc::APP) {
|
|
uptr addr = start;
|
|
CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(addr)));
|
|
CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(addr)));
|
|
CHECK_EQ(MEM_TO_ORIGIN(addr), SHADOW_TO_ORIGIN(MEM_TO_SHADOW(addr)));
|
|
|
|
addr = (start + end) / 2;
|
|
CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(addr)));
|
|
CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(addr)));
|
|
CHECK_EQ(MEM_TO_ORIGIN(addr), SHADOW_TO_ORIGIN(MEM_TO_SHADOW(addr)));
|
|
|
|
addr = end - 1;
|
|
CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(addr)));
|
|
CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(addr)));
|
|
CHECK_EQ(MEM_TO_ORIGIN(addr), SHADOW_TO_ORIGIN(MEM_TO_SHADOW(addr)));
|
|
}
|
|
prev_end = end;
|
|
}
|
|
}
|
|
|
|
bool InitShadow(bool map_shadow, bool init_origins) {
|
|
// Let user know mapping parameters first.
|
|
VPrintf(1, "__msan_init %p\n", &__msan_init);
|
|
for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
|
|
VPrintf(1, "%s: %zx - %zx\n", kMemoryLayout[i].name, kMemoryLayout[i].start,
|
|
kMemoryLayout[i].end - 1);
|
|
|
|
CheckMemoryLayoutSanity();
|
|
|
|
if (!MEM_IS_APP(&__msan_init)) {
|
|
Printf("FATAL: Code %p is out of application range. Non-PIE build?\n",
|
|
(uptr)&__msan_init);
|
|
return false;
|
|
}
|
|
|
|
for (unsigned i = 0; i < kMemoryLayoutSize; ++i) {
|
|
uptr start = kMemoryLayout[i].start;
|
|
uptr end = kMemoryLayout[i].end;
|
|
uptr size= end - start;
|
|
MappingDesc::Type type = kMemoryLayout[i].type;
|
|
if ((map_shadow && type == MappingDesc::SHADOW) ||
|
|
(init_origins && type == MappingDesc::ORIGIN)) {
|
|
if (!CheckMemoryRangeAvailability(start, size)) return false;
|
|
if ((uptr)MmapFixedNoReserve(start, size) != start) return false;
|
|
if (common_flags()->use_madv_dontdump)
|
|
DontDumpShadowMemory(start, size);
|
|
} else if (type == MappingDesc::INVALID) {
|
|
if (!CheckMemoryRangeAvailability(start, size)) return false;
|
|
if (!ProtectMemoryRange(start, size)) return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void MsanDie() {
|
|
if (common_flags()->coverage)
|
|
__sanitizer_cov_dump();
|
|
if (death_callback)
|
|
death_callback();
|
|
internal__exit(flags()->exit_code);
|
|
}
|
|
|
|
static void MsanAtExit(void) {
|
|
if (flags()->print_stats && (flags()->atexit || msan_report_count > 0))
|
|
ReportStats();
|
|
if (msan_report_count > 0) {
|
|
ReportAtExitStatistics();
|
|
if (flags()->exit_code) _exit(flags()->exit_code);
|
|
}
|
|
}
|
|
|
|
void InstallAtExitHandler() {
|
|
atexit(MsanAtExit);
|
|
}
|
|
|
|
// ---------------------- TSD ---------------- {{{1
|
|
|
|
static pthread_key_t tsd_key;
|
|
static bool tsd_key_inited = false;
|
|
|
|
void MsanTSDInit(void (*destructor)(void *tsd)) {
|
|
CHECK(!tsd_key_inited);
|
|
tsd_key_inited = true;
|
|
CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
|
|
}
|
|
|
|
static THREADLOCAL MsanThread* msan_current_thread;
|
|
|
|
MsanThread *GetCurrentThread() {
|
|
return msan_current_thread;
|
|
}
|
|
|
|
void SetCurrentThread(MsanThread *t) {
|
|
// Make sure we do not reset the current MsanThread.
|
|
CHECK_EQ(0, msan_current_thread);
|
|
msan_current_thread = t;
|
|
// Make sure that MsanTSDDtor gets called at the end.
|
|
CHECK(tsd_key_inited);
|
|
pthread_setspecific(tsd_key, (void *)t);
|
|
}
|
|
|
|
void MsanTSDDtor(void *tsd) {
|
|
MsanThread *t = (MsanThread*)tsd;
|
|
if (t->destructor_iterations_ > 1) {
|
|
t->destructor_iterations_--;
|
|
CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
|
|
return;
|
|
}
|
|
msan_current_thread = nullptr;
|
|
// Make sure that signal handler can not see a stale current thread pointer.
|
|
atomic_signal_fence(memory_order_seq_cst);
|
|
MsanThread::TSDDtor(tsd);
|
|
}
|
|
|
|
} // namespace __msan
|
|
|
|
#endif // SANITIZER_FREEBSD || SANITIZER_LINUX
|