146 lines
4.1 KiB
C++
146 lines
4.1 KiB
C++
//===-- asan_posix.cpp ----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Posix-specific details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_POSIX
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#include "asan_internal.h"
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#include "asan_interceptors.h"
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#include "asan_mapping.h"
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#include "asan_poisoning.h"
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#include "asan_report.h"
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#include "asan_stack.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_posix.h"
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#include "sanitizer_common/sanitizer_procmaps.h"
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#include <pthread.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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namespace __asan {
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void AsanOnDeadlySignal(int signo, void *siginfo, void *context) {
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StartReportDeadlySignal();
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SignalContext sig(siginfo, context);
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ReportDeadlySignal(sig);
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}
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bool PlatformUnpoisonStacks() {
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stack_t signal_stack;
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CHECK_EQ(0, sigaltstack(nullptr, &signal_stack));
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uptr sigalt_bottom = (uptr)signal_stack.ss_sp;
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uptr sigalt_top = (uptr)((char *)signal_stack.ss_sp + signal_stack.ss_size);
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// If we're executing on the signal alternate stack AND the Linux flag
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// SS_AUTODISARM was used, then we cannot get the signal alternate stack
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// bounds from sigaltstack -- sigaltstack's output looks just as if no
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// alternate stack has ever been set up.
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// We're always unpoisoning the signal alternate stack to support jumping
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// between the default stack and signal alternate stack.
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if (signal_stack.ss_flags != SS_DISABLE)
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UnpoisonStack(sigalt_bottom, sigalt_top, "sigalt");
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if (signal_stack.ss_flags != SS_ONSTACK)
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return false;
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// Since we're on the signal alternate stack, we cannot find the DEFAULT
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// stack bottom using a local variable.
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uptr default_bottom, tls_addr, tls_size, stack_size;
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GetThreadStackAndTls(/*main=*/false, &default_bottom, &stack_size, &tls_addr,
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&tls_size);
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UnpoisonStack(default_bottom, default_bottom + stack_size, "default");
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return true;
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}
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// ---------------------- TSD ---------------- {{{1
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#if SANITIZER_NETBSD && !ASAN_DYNAMIC
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// Thread Static Data cannot be used in early static ASan init on NetBSD.
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// Reuse the Asan TSD API for compatibility with existing code
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// with an alternative implementation.
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static void (*tsd_destructor)(void *tsd) = nullptr;
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struct tsd_key {
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tsd_key() : key(nullptr) {}
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~tsd_key() {
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CHECK(tsd_destructor);
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if (key)
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(*tsd_destructor)(key);
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}
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void *key;
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};
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static thread_local struct tsd_key key;
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void AsanTSDInit(void (*destructor)(void *tsd)) {
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CHECK(!tsd_destructor);
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tsd_destructor = destructor;
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}
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void *AsanTSDGet() {
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CHECK(tsd_destructor);
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return key.key;
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}
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void AsanTSDSet(void *tsd) {
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CHECK(tsd_destructor);
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CHECK(tsd);
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CHECK(!key.key);
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key.key = tsd;
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}
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void PlatformTSDDtor(void *tsd) {
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CHECK(tsd_destructor);
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CHECK_EQ(key.key, tsd);
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key.key = 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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AsanThread::TSDDtor(tsd);
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}
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#else
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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 AsanTSDInit(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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void *AsanTSDGet() {
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CHECK(tsd_key_inited);
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return pthread_getspecific(tsd_key);
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}
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void AsanTSDSet(void *tsd) {
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CHECK(tsd_key_inited);
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pthread_setspecific(tsd_key, tsd);
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}
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void PlatformTSDDtor(void *tsd) {
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AsanThreadContext *context = (AsanThreadContext*)tsd;
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if (context->destructor_iterations > 1) {
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context->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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AsanThread::TSDDtor(tsd);
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}
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#endif
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} // namespace __asan
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#endif // SANITIZER_POSIX
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