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[asan] Allow enabling coverage at activation. 

llvm-svn: 224838
This commit is contained in:
Evgeniy Stepanov 2014-12-25 14:26:45 +00:00
parent fe5c5b98b3
commit be9a53fec6
9 changed files with 147 additions and 68 deletions
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25
compiler-rt/lib/asan/asan_activation.cc
View File

@ -26,6 +26,8 @@ static struct AsanDeactivatedFlags {
AllocatorOptions allocator_options;
int malloc_context_size;
bool poison_heap;
bool coverage;
const char *coverage_dir;
void OverrideFromActivationFlags() {
Flags f;
@ -53,16 +55,19 @@ static struct AsanDeactivatedFlags {
allocator_options.SetFrom(&f, &cf);
malloc_context_size = cf.malloc_context_size;
poison_heap = f.poison_heap;
coverage = cf.coverage;
coverage_dir = cf.coverage_dir;
}
void Print() {
Report("quarantine_size_mb %d, max_redzone %d, poison_heap %d, "
"malloc_context_size %d, alloc_dealloc_mismatch %d, "
"allocator_may_return_null %d\n",
allocator_options.quarantine_size_mb, allocator_options.max_redzone,
poison_heap, malloc_context_size,
allocator_options.alloc_dealloc_mismatch,
allocator_options.may_return_null);
Report(
"quarantine_size_mb %d, max_redzone %d, poison_heap %d, "
"malloc_context_size %d, alloc_dealloc_mismatch %d, "
"allocator_may_return_null %d, coverage %d, coverage_dir %s\n",
allocator_options.quarantine_size_mb, allocator_options.max_redzone,
poison_heap, malloc_context_size,
allocator_options.alloc_dealloc_mismatch,
allocator_options.may_return_null, coverage, coverage_dir);
}
} asan_deactivated_flags;
@ -76,10 +81,14 @@ void AsanDeactivate() {
GetAllocatorOptions(&asan_deactivated_flags.allocator_options);
asan_deactivated_flags.malloc_context_size = GetMallocContextSize();
asan_deactivated_flags.poison_heap = CanPoisonMemory();
asan_deactivated_flags.coverage = common_flags()->coverage;
asan_deactivated_flags.coverage_dir = common_flags()->coverage_dir;
// Deactivate the runtime.
SetCanPoisonMemory(false);
SetMallocContextSize(1);
ReInitializeCoverage(false, nullptr);
AllocatorOptions disabled = asan_deactivated_flags.allocator_options;
disabled.quarantine_size_mb = 0;
disabled.min_redzone = 16; // Redzone must be at least 16 bytes long.
@ -99,6 +108,8 @@ void AsanActivate() {
SetCanPoisonMemory(asan_deactivated_flags.poison_heap);
SetMallocContextSize(asan_deactivated_flags.malloc_context_size);
ReInitializeCoverage(asan_deactivated_flags.coverage,
asan_deactivated_flags.coverage_dir);
ReInitializeAllocator(asan_deactivated_flags.allocator_options);
asan_is_deactivated = false;

4
compiler-rt/lib/asan/asan_interceptors.cc
View File

@ -169,8 +169,8 @@ DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)
} while (false)
#define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
#define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, res) CovUpdateMapping()
#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() CovUpdateMapping()
#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, res) CoverageUpdateMapping()
#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() CoverageUpdateMapping()
#define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!asan_inited)
#include "sanitizer_common/sanitizer_common_interceptors.inc"

15
compiler-rt/lib/asan/asan_rtl.cc
View File

@ -397,11 +397,6 @@ static void AsanInitInternal() {
MaybeStartBackgroudThread();
// Now that ASan runtime is (mostly) initialized, deactivate it if
// necessary, so that it can be re-activated when requested.
if (flags()->start_deactivated)
AsanDeactivate();
// On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
// should be set to 1 prior to initializing the threads.
asan_inited = 1;
@ -410,10 +405,12 @@ static void AsanInitInternal() {
if (flags()->atexit)
Atexit(asan_atexit);
if (common_flags()->coverage) {
__sanitizer_cov_init();
Atexit(__sanitizer_cov_dump);
}
InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
// Now that ASan runtime is (mostly) initialized, deactivate it if
// necessary, so that it can be re-activated when requested.
if (flags()->start_deactivated)
AsanDeactivate();
// interceptors
InitTlsSize();

5
compiler-rt/lib/lsan/lsan.cc
View File

@ -53,10 +53,7 @@ extern "C" void __lsan_init() {
if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit)
Atexit(DoLeakCheck);
if (common_flags()->coverage) {
__sanitizer_cov_init();
Atexit(__sanitizer_cov_dump);
}
InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
lsan_inited = true;
lsan_init_is_running = false;

5
compiler-rt/lib/msan/msan.cc
View File

@ -377,10 +377,7 @@ void __msan_init() {
Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
if (common_flags()->coverage) {
__sanitizer_cov_init();
Atexit(__sanitizer_cov_dump);
}
InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
MsanTSDInit(MsanTSDDtor);

5
compiler-rt/lib/sanitizer_common/sanitizer_common.h
View File

@ -214,10 +214,13 @@ void PrepareForSandboxing(__sanitizer_sandbox_arguments *args);
void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args);
void SetSandboxingCallback(void (*f)());
void CovUpdateMapping(uptr caller_pc = 0);
void CoverageUpdateMapping();
void CovBeforeFork();
void CovAfterFork(int child_pid);
void InitializeCoverage(bool enabled, const char *coverage_dir);
void ReInitializeCoverage(bool enabled, const char *coverage_dir);
void InitTlsSize();
uptr GetTlsSize();

94
compiler-rt/lib/sanitizer_common/sanitizer_coverage_libcdep.cc
View File

@ -58,12 +58,15 @@ static atomic_uintptr_t coverage_counter;
static bool cov_sandboxed = false;
static int cov_fd = kInvalidFd;
static unsigned int cov_max_block_size = 0;
static bool coverage_enabled = false;
static const char *coverage_dir;
namespace __sanitizer {
class CoverageData {
public:
void Init();
void ReInit();
void BeforeFork();
void AfterFork(int child_pid);
void Extend(uptr npcs);
@ -130,15 +133,16 @@ class CoverageData {
StaticSpinMutex mu;
void DirectOpen();
void ReInit();
};
static CoverageData coverage_data;
void CovUpdateMapping(const char *path, uptr caller_pc = 0);
void CoverageData::DirectOpen() {
InternalScopedString path(kMaxPathLength);
internal_snprintf((char *)path.data(), path.size(), "%s/%zd.sancov.raw",
common_flags()->coverage_dir, internal_getpid());
coverage_dir, internal_getpid());
pc_fd = OpenFile(path.data(), true);
if (internal_iserror(pc_fd)) {
Report(" Coverage: failed to open %s for writing\n", path.data());
@ -146,7 +150,7 @@ void CoverageData::DirectOpen() {
}
pc_array_mapped_size = 0;
CovUpdateMapping();
CovUpdateMapping(coverage_dir);
}
void CoverageData::Init() {
@ -178,16 +182,22 @@ void CoverageData::Init() {
}
void CoverageData::ReInit() {
internal_munmap(pc_array, sizeof(uptr) * kPcArrayMaxSize);
if (pc_array) {
internal_munmap(pc_array, sizeof(uptr) * kPcArrayMaxSize);
pc_array = nullptr;
}
if (pc_fd != kInvalidFd) internal_close(pc_fd);
if (common_flags()->coverage_direct) {
// In memory-mapped mode we must extend the new file to the known array
// size.
uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
Init();
if (size) Extend(size);
} else {
Init();
if (coverage_enabled) {
if (common_flags()->coverage_direct) {
// In memory-mapped mode we must extend the new file to the known array
// size.
uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
Init();
if (size) Extend(size);
if (coverage_enabled) CovUpdateMapping(coverage_dir);
} else {
Init();
}
}
}
@ -206,13 +216,13 @@ void CoverageData::Extend(uptr npcs) {
if (!common_flags()->coverage_direct) return;
SpinMutexLock l(&mu);
if (pc_fd == kInvalidFd) DirectOpen();
CHECK_NE(pc_fd, kInvalidFd);
uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
size += npcs * sizeof(uptr);
if (size > pc_array_mapped_size) {
if (coverage_enabled && size > pc_array_mapped_size) {
if (pc_fd == kInvalidFd) DirectOpen();
CHECK_NE(pc_fd, kInvalidFd);
uptr new_mapped_size = pc_array_mapped_size;
while (size > new_mapped_size) new_mapped_size += kPcArrayMmapSize;
CHECK_LE(new_mapped_size, sizeof(uptr) * kPcArrayMaxSize);
@ -361,15 +371,14 @@ static int CovOpenFile(bool packed, const char *name,
InternalScopedString path(kMaxPathLength);
if (!packed) {
CHECK(name);
path.append("%s/%s.%zd.%s", common_flags()->coverage_dir, name,
internal_getpid(), extension);
path.append("%s/%s.%zd.%s", coverage_dir, name, internal_getpid(),
extension);
} else {
if (!name)
path.append("%s/%zd.%s.packed", common_flags()->coverage_dir,
internal_getpid(), extension);
else
path.append("%s/%s.%s.packed", common_flags()->coverage_dir, name,
path.append("%s/%zd.%s.packed", coverage_dir, internal_getpid(),
extension);
else
path.append("%s/%s.%s.packed", coverage_dir, name, extension);
}
uptr fd = OpenFile(path.data(), true);
if (internal_iserror(fd)) {
@ -455,7 +464,7 @@ void CoverageData::DumpCallerCalleePairs() {
// Every event is a u32 value (index in tr_pc_array_index) so we compute
// it once and then cache in the provided 'cache' storage.
void CoverageData::TraceBasicBlock(uptr *cache) {
CHECK(common_flags()->coverage);
CHECK(coverage_enabled);
uptr idx = *cache;
if (!idx) {
CHECK_LT(tr_pc_array_index, kTrPcArrayMaxSize);
@ -492,7 +501,7 @@ static void CovDumpAsBitSet() {
// Dump the coverage on disk.
static void CovDump() {
if (!common_flags()->coverage || common_flags()->coverage_direct) return;
if (!coverage_enabled || common_flags()->coverage_direct) return;
#if !SANITIZER_WINDOWS
if (atomic_fetch_add(&dump_once_guard, 1, memory_order_relaxed))
return;
@ -532,8 +541,8 @@ static void CovDump() {
} else {
// One file per module per process.
path.clear();
path.append("%s/%s.%zd.sancov", common_flags()->coverage_dir,
module_name, internal_getpid());
path.append("%s/%s.%zd.sancov", coverage_dir, module_name,
internal_getpid());
int fd = CovOpenFile(false /* packed */, module_name);
if (fd > 0) {
internal_write(fd, offsets.data(), offsets.size() * sizeof(u32));
@ -553,7 +562,7 @@ static void CovDump() {
void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
if (!args) return;
if (!common_flags()->coverage) return;
if (!coverage_enabled) return;
cov_sandboxed = args->coverage_sandboxed;
if (!cov_sandboxed) return;
cov_fd = args->coverage_fd;
@ -565,7 +574,7 @@ void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
int MaybeOpenCovFile(const char *name) {
CHECK(name);
if (!common_flags()->coverage) return -1;
if (!coverage_enabled) return -1;
return CovOpenFile(true /* packed */, name);
}
@ -577,6 +586,24 @@ void CovAfterFork(int child_pid) {
coverage_data.AfterFork(child_pid);
}
void InitializeCoverage(bool enabled, const char *dir) {
coverage_enabled = enabled;
coverage_dir = dir;
if (enabled) coverage_data.Init();
if (!common_flags()->coverage_direct) Atexit(__sanitizer_cov_dump);
}
void ReInitializeCoverage(bool enabled, const char *dir) {
coverage_enabled = enabled;
coverage_dir = dir;
coverage_data.ReInit();
}
void CoverageUpdateMapping() {
if (coverage_enabled)
CovUpdateMapping(coverage_dir);
}
} // namespace __sanitizer
extern "C" {
@ -589,19 +616,20 @@ __sanitizer_cov_indir_call16(uptr callee, uptr callee_cache16[]) {
coverage_data.IndirCall(StackTrace::GetPreviousInstructionPc(GET_CALLER_PC()),
callee, callee_cache16, 16);
}
SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_dump() { CovDump(); }
SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_init() {
coverage_enabled = true;
coverage_dir = common_flags()->coverage_dir;
coverage_data.Init();
}
SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_dump() { CovDump(); }
SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_module_init(s32 **guards,
uptr npcs) {
coverage_data.InitializeGuards(guards, npcs);
if (!common_flags()->coverage || !common_flags()->coverage_direct)
return;
if (SANITIZER_ANDROID) {
if (!common_flags()->coverage_direct) return;
if (SANITIZER_ANDROID && coverage_enabled) {
// dlopen/dlclose interceptors do not work on Android, so we rely on
// Extend() calls to update .sancov.map.
CovUpdateMapping(GET_CALLER_PC());
CovUpdateMapping(coverage_dir, GET_CALLER_PC());
}
coverage_data.Extend(npcs);
}

15
compiler-rt/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc
View File

@ -62,8 +62,8 @@ struct CachedMapping {
static CachedMapping cached_mapping;
static StaticSpinMutex mapping_mu;
void CovUpdateMapping(uptr caller_pc) {
if (!common_flags()->coverage || !common_flags()->coverage_direct) return;
void CovUpdateMapping(const char *coverage_dir, uptr caller_pc) {
if (!common_flags()->coverage_direct) return;
SpinMutexLock l(&mapping_mu);
@ -92,11 +92,10 @@ void CovUpdateMapping(uptr caller_pc) {
}
int err;
InternalScopedString tmp_path(64 +
internal_strlen(common_flags()->coverage_dir));
InternalScopedString tmp_path(64 + internal_strlen(coverage_dir));
uptr res = internal_snprintf((char *)tmp_path.data(), tmp_path.size(),
"%s/%zd.sancov.map.tmp", common_flags()->coverage_dir,
internal_getpid());
"%s/%zd.sancov.map.tmp", coverage_dir,
internal_getpid());
CHECK_LE(res, tmp_path.size());
uptr map_fd = OpenFile(tmp_path.data(), true);
if (internal_iserror(map_fd, &err)) {
@ -112,9 +111,9 @@ void CovUpdateMapping(uptr caller_pc) {
}
internal_close(map_fd);
InternalScopedString path(64 + internal_strlen(common_flags()->coverage_dir));
InternalScopedString path(64 + internal_strlen(coverage_dir));
res = internal_snprintf((char *)path.data(), path.size(), "%s/%zd.sancov.map",
common_flags()->coverage_dir, internal_getpid());
coverage_dir, internal_getpid());
CHECK_LE(res, path.size());
res = internal_rename(tmp_path.data(), path.data());
if (internal_iserror(res, &err)) {

47
compiler-rt/test/asan/TestCases/Linux/coverage-direct-activation.cc Normal file
View File

@ -0,0 +1,47 @@
// Test for direct coverage writing enabled as activation time.
// RUN: %clangxx_asan -fsanitize-coverage=1 -DSHARED %s -shared -o %T/libcoverage_direct_test_1.so -fPIC
// RUN: %clangxx -c -DSO_DIR=\"%T\" %s -o %t.o
// RUN: %clangxx_asan -fsanitize-coverage=1 %t.o %libdl -o %t
// RUN: rm -rf %T/coverage-direct-activation
// RUN: mkdir -p %T/coverage-direct-activation/normal
// RUN: ASAN_OPTIONS=coverage=1,coverage_direct=0,coverage_dir=%T/coverage-direct-activation/normal:verbosity=1 %run %t
// RUN: %sancov print %T/coverage-direct-activation/normal/*.sancov >%T/coverage-direct-activation/normal/out.txt
// RUN: mkdir -p %T/coverage-direct-activation/direct
// RUN: ASAN_OPTIONS=start_deactivated=1,coverage_direct=1,verbosity=1 \
// RUN: ASAN_ACTIVATION_OPTIONS=coverage=1,coverage_dir=%T/coverage-direct-activation/direct %run %t
// RUN: cd %T/coverage-direct-activation/direct
// RUN: %sancov rawunpack *.sancov.raw
// RUN: %sancov print *.sancov >out.txt
// RUN: cd ../..
// RUN: diff -u coverage-direct-activation/normal/out.txt coverage-direct-activation/direct/out.txt
// XFAIL: android
#include <assert.h>
#include <dlfcn.h>
#include <stdio.h>
#include <unistd.h>
#ifdef SHARED
extern "C" {
void bar() { printf("bar\n"); }
}
#else
int main(int argc, char **argv) {
fprintf(stderr, "PID: %d\n", getpid());
void *handle1 =
dlopen(SO_DIR "/libcoverage_direct_test_1.so", RTLD_LAZY);
assert(handle1);
void (*bar1)() = (void (*)())dlsym(handle1, "bar");
assert(bar1);
bar1();
return 0;
}
#endif