145 lines
4.4 KiB
C++
145 lines
4.4 KiB
C++
#include "dfsan_thread.h"
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#include <pthread.h>
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#include "dfsan.h"
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#include "sanitizer_common/sanitizer_tls_get_addr.h"
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namespace __dfsan {
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DFsanThread *DFsanThread::Create(void *start_routine_trampoline,
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thread_callback_t start_routine, void *arg,
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bool track_origins) {
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uptr PageSize = GetPageSizeCached();
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uptr size = RoundUpTo(sizeof(DFsanThread), PageSize);
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DFsanThread *thread = (DFsanThread *)MmapOrDie(size, __func__);
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thread->start_routine_trampoline_ = start_routine_trampoline;
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thread->start_routine_ = start_routine;
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thread->arg_ = arg;
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thread->track_origins_ = track_origins;
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thread->destructor_iterations_ = GetPthreadDestructorIterations();
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return thread;
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}
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void DFsanThread::SetThreadStackAndTls() {
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uptr tls_size = 0;
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uptr stack_size = 0;
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GetThreadStackAndTls(IsMainThread(), &stack_.bottom, &stack_size, &tls_begin_,
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&tls_size);
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stack_.top = stack_.bottom + stack_size;
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tls_end_ = tls_begin_ + tls_size;
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int local;
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CHECK(AddrIsInStack((uptr)&local));
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}
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void DFsanThread::ClearShadowForThreadStackAndTLS() {
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dfsan_set_label(0, (void *)stack_.bottom, stack_.top - stack_.bottom);
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if (tls_begin_ != tls_end_)
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dfsan_set_label(0, (void *)tls_begin_, tls_end_ - tls_begin_);
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DTLS *dtls = DTLS_Get();
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CHECK_NE(dtls, 0);
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ForEachDVT(dtls, [](const DTLS::DTV &dtv, int id) {
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dfsan_set_label(0, (void *)(dtv.beg), dtv.size);
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});
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}
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void DFsanThread::Init() {
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SetThreadStackAndTls();
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ClearShadowForThreadStackAndTLS();
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}
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void DFsanThread::TSDDtor(void *tsd) {
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DFsanThread *t = (DFsanThread *)tsd;
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t->Destroy();
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}
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void DFsanThread::Destroy() {
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malloc_storage().CommitBack();
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// We also clear the shadow on thread destruction because
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// some code may still be executing in later TSD destructors
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// and we don't want it to have any poisoned stack.
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ClearShadowForThreadStackAndTLS();
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uptr size = RoundUpTo(sizeof(DFsanThread), GetPageSizeCached());
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UnmapOrDie(this, size);
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DTLS_Destroy();
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}
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thread_return_t DFsanThread::ThreadStart() {
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if (!start_routine_) {
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// start_routine_ == 0 if we're on the main thread or on one of the
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// OS X libdispatch worker threads. But nobody is supposed to call
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// ThreadStart() for the worker threads.
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return 0;
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}
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CHECK(start_routine_trampoline_);
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typedef void *(*thread_callback_trampoline_t)(void *, void *, dfsan_label,
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dfsan_label *);
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typedef void *(*thread_callback_origin_trampoline_t)(
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void *, void *, dfsan_label, dfsan_label *, dfsan_origin, dfsan_origin *);
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dfsan_label ret_label;
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if (!track_origins_)
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return ((thread_callback_trampoline_t)
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start_routine_trampoline_)((void *)start_routine_, arg_, 0,
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&ret_label);
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dfsan_origin ret_origin;
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return ((thread_callback_origin_trampoline_t)
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start_routine_trampoline_)((void *)start_routine_, arg_, 0,
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&ret_label, 0, &ret_origin);
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}
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DFsanThread::StackBounds DFsanThread::GetStackBounds() const {
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return {stack_.bottom, stack_.top};
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}
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uptr DFsanThread::stack_top() { return GetStackBounds().top; }
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uptr DFsanThread::stack_bottom() { return GetStackBounds().bottom; }
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bool DFsanThread::AddrIsInStack(uptr addr) {
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const auto bounds = GetStackBounds();
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return addr >= bounds.bottom && addr < bounds.top;
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}
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static pthread_key_t tsd_key;
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static bool tsd_key_inited = false;
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void DFsanTSDInit(void (*destructor)(void *tsd)) {
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CHECK(!tsd_key_inited);
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tsd_key_inited = true;
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CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
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}
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static THREADLOCAL DFsanThread *dfsan_current_thread;
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DFsanThread *GetCurrentThread() { return dfsan_current_thread; }
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void SetCurrentThread(DFsanThread *t) {
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// Make sure we do not reset the current DFsanThread.
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CHECK_EQ(0, dfsan_current_thread);
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dfsan_current_thread = t;
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// Make sure that DFsanTSDDtor gets called at the end.
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CHECK(tsd_key_inited);
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pthread_setspecific(tsd_key, t);
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}
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void DFsanTSDDtor(void *tsd) {
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DFsanThread *t = (DFsanThread *)tsd;
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if (t->destructor_iterations_ > 1) {
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t->destructor_iterations_--;
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CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
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return;
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}
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dfsan_current_thread = nullptr;
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// Make sure that signal handler can not see a stale current thread pointer.
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atomic_signal_fence(memory_order_seq_cst);
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DFsanThread::TSDDtor(tsd);
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}
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} // namespace __dfsan
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