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539 lines
17 KiB
539 lines
17 KiB
//===-- sanitizer_fuchsia.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 shared between AddressSanitizer and other sanitizer
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// run-time libraries and implements Fuchsia-specific functions from
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// sanitizer_common.h.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_fuchsia.h"
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#if SANITIZER_FUCHSIA
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#include <limits.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <zircon/errors.h>
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#include <zircon/process.h>
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#include <zircon/syscalls.h>
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#include <zircon/utc.h>
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#include "sanitizer_common.h"
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#include "sanitizer_libc.h"
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#include "sanitizer_mutex.h"
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namespace __sanitizer {
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void NORETURN internal__exit(int exitcode) { _zx_process_exit(exitcode); }
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uptr internal_sched_yield() {
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zx_status_t status = _zx_nanosleep(0);
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CHECK_EQ(status, ZX_OK);
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return 0; // Why doesn't this return void?
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}
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static void internal_nanosleep(zx_time_t ns) {
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zx_status_t status = _zx_nanosleep(_zx_deadline_after(ns));
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CHECK_EQ(status, ZX_OK);
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}
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unsigned int internal_sleep(unsigned int seconds) {
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internal_nanosleep(ZX_SEC(seconds));
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return 0;
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}
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u64 NanoTime() {
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zx_handle_t utc_clock = _zx_utc_reference_get();
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CHECK_NE(utc_clock, ZX_HANDLE_INVALID);
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zx_time_t time;
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zx_status_t status = _zx_clock_read(utc_clock, &time);
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CHECK_EQ(status, ZX_OK);
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return time;
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}
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u64 MonotonicNanoTime() { return _zx_clock_get_monotonic(); }
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uptr internal_getpid() {
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zx_info_handle_basic_t info;
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zx_status_t status =
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_zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &info,
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sizeof(info), NULL, NULL);
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CHECK_EQ(status, ZX_OK);
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uptr pid = static_cast<uptr>(info.koid);
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CHECK_EQ(pid, info.koid);
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return pid;
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}
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int internal_dlinfo(void *handle, int request, void *p) {
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UNIMPLEMENTED();
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}
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uptr GetThreadSelf() { return reinterpret_cast<uptr>(thrd_current()); }
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tid_t GetTid() { return GetThreadSelf(); }
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void Abort() { abort(); }
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int Atexit(void (*function)(void)) { return atexit(function); }
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void SleepForSeconds(int seconds) { internal_sleep(seconds); }
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void SleepForMillis(int millis) { internal_nanosleep(ZX_MSEC(millis)); }
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void GetThreadStackTopAndBottom(bool, uptr *stack_top, uptr *stack_bottom) {
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pthread_attr_t attr;
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CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
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void *base;
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size_t size;
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CHECK_EQ(pthread_attr_getstack(&attr, &base, &size), 0);
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CHECK_EQ(pthread_attr_destroy(&attr), 0);
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*stack_bottom = reinterpret_cast<uptr>(base);
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*stack_top = *stack_bottom + size;
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}
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void InitializePlatformEarly() {}
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void MaybeReexec() {}
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void CheckASLR() {}
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void CheckMPROTECT() {}
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void PlatformPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {}
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void DisableCoreDumperIfNecessary() {}
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void InstallDeadlySignalHandlers(SignalHandlerType handler) {}
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void SetAlternateSignalStack() {}
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void UnsetAlternateSignalStack() {}
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void InitTlsSize() {}
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bool SignalContext::IsStackOverflow() const { return false; }
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void SignalContext::DumpAllRegisters(void *context) { UNIMPLEMENTED(); }
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const char *SignalContext::Describe() const { UNIMPLEMENTED(); }
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enum MutexState : int { MtxUnlocked = 0, MtxLocked = 1, MtxSleeping = 2 };
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BlockingMutex::BlockingMutex() {
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// NOTE! It's important that this use internal_memset, because plain
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// memset might be intercepted (e.g., actually be __asan_memset).
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// Defining this so the compiler initializes each field, e.g.:
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// BlockingMutex::BlockingMutex() : BlockingMutex(LINKER_INITIALIZED) {}
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// might result in the compiler generating a call to memset, which would
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// have the same problem.
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internal_memset(this, 0, sizeof(*this));
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}
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void BlockingMutex::Lock() {
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CHECK_EQ(owner_, 0);
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atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
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if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
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return;
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while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
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zx_status_t status =
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_zx_futex_wait(reinterpret_cast<zx_futex_t *>(m), MtxSleeping,
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ZX_HANDLE_INVALID, ZX_TIME_INFINITE);
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if (status != ZX_ERR_BAD_STATE) // Normal race.
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CHECK_EQ(status, ZX_OK);
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}
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}
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void BlockingMutex::Unlock() {
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atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
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u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release);
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CHECK_NE(v, MtxUnlocked);
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if (v == MtxSleeping) {
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zx_status_t status = _zx_futex_wake(reinterpret_cast<zx_futex_t *>(m), 1);
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CHECK_EQ(status, ZX_OK);
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}
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}
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void BlockingMutex::CheckLocked() {
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atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
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CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed));
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}
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uptr GetPageSize() { return PAGE_SIZE; }
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uptr GetMmapGranularity() { return PAGE_SIZE; }
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sanitizer_shadow_bounds_t ShadowBounds;
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uptr GetMaxUserVirtualAddress() {
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ShadowBounds = __sanitizer_shadow_bounds();
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return ShadowBounds.memory_limit - 1;
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}
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uptr GetMaxVirtualAddress() { return GetMaxUserVirtualAddress(); }
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static void *DoAnonymousMmapOrDie(uptr size, const char *mem_type,
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bool raw_report, bool die_for_nomem) {
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size = RoundUpTo(size, PAGE_SIZE);
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zx_handle_t vmo;
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zx_status_t status = _zx_vmo_create(size, 0, &vmo);
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if (status != ZX_OK) {
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if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
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ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status,
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raw_report);
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return nullptr;
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}
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_zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
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internal_strlen(mem_type));
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// TODO(mcgrathr): Maybe allocate a VMAR for all sanitizer heap and use that?
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uintptr_t addr;
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status =
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_zx_vmar_map(_zx_vmar_root_self(), ZX_VM_PERM_READ | ZX_VM_PERM_WRITE, 0,
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vmo, 0, size, &addr);
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_zx_handle_close(vmo);
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if (status != ZX_OK) {
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if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
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ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status,
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raw_report);
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return nullptr;
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}
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IncreaseTotalMmap(size);
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return reinterpret_cast<void *>(addr);
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}
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void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
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return DoAnonymousMmapOrDie(size, mem_type, raw_report, true);
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}
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void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
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return MmapOrDie(size, mem_type);
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}
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void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
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return DoAnonymousMmapOrDie(size, mem_type, false, false);
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}
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uptr ReservedAddressRange::Init(uptr init_size, const char *name,
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uptr fixed_addr) {
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init_size = RoundUpTo(init_size, PAGE_SIZE);
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DCHECK_EQ(os_handle_, ZX_HANDLE_INVALID);
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uintptr_t base;
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zx_handle_t vmar;
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zx_status_t status =
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_zx_vmar_allocate(
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_zx_vmar_root_self(),
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ZX_VM_CAN_MAP_READ | ZX_VM_CAN_MAP_WRITE | ZX_VM_CAN_MAP_SPECIFIC,
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0, init_size, &vmar, &base);
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if (status != ZX_OK)
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ReportMmapFailureAndDie(init_size, name, "zx_vmar_allocate", status);
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base_ = reinterpret_cast<void *>(base);
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size_ = init_size;
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name_ = name;
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os_handle_ = vmar;
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return reinterpret_cast<uptr>(base_);
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}
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static uptr DoMmapFixedOrDie(zx_handle_t vmar, uptr fixed_addr, uptr map_size,
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void *base, const char *name, bool die_for_nomem) {
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uptr offset = fixed_addr - reinterpret_cast<uptr>(base);
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map_size = RoundUpTo(map_size, PAGE_SIZE);
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zx_handle_t vmo;
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zx_status_t status = _zx_vmo_create(map_size, 0, &vmo);
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if (status != ZX_OK) {
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if (status != ZX_ERR_NO_MEMORY || die_for_nomem)
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ReportMmapFailureAndDie(map_size, name, "zx_vmo_create", status);
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return 0;
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}
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_zx_object_set_property(vmo, ZX_PROP_NAME, name, internal_strlen(name));
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DCHECK_GE(base + size_, map_size + offset);
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uintptr_t addr;
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status =
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_zx_vmar_map(vmar, ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_SPECIFIC,
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offset, vmo, 0, map_size, &addr);
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_zx_handle_close(vmo);
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if (status != ZX_OK) {
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if (status != ZX_ERR_NO_MEMORY || die_for_nomem) {
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ReportMmapFailureAndDie(map_size, name, "zx_vmar_map", status);
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}
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return 0;
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}
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IncreaseTotalMmap(map_size);
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return addr;
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}
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uptr ReservedAddressRange::Map(uptr fixed_addr, uptr map_size,
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const char *name) {
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return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_,
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name_, false);
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}
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uptr ReservedAddressRange::MapOrDie(uptr fixed_addr, uptr map_size,
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const char *name) {
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return DoMmapFixedOrDie(os_handle_, fixed_addr, map_size, base_,
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name_, true);
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}
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void UnmapOrDieVmar(void *addr, uptr size, zx_handle_t target_vmar) {
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if (!addr || !size) return;
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size = RoundUpTo(size, PAGE_SIZE);
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zx_status_t status =
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_zx_vmar_unmap(target_vmar, reinterpret_cast<uintptr_t>(addr), size);
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if (status != ZX_OK) {
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Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
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SanitizerToolName, size, size, addr);
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CHECK("unable to unmap" && 0);
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}
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DecreaseTotalMmap(size);
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}
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void ReservedAddressRange::Unmap(uptr addr, uptr size) {
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CHECK_LE(size, size_);
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const zx_handle_t vmar = static_cast<zx_handle_t>(os_handle_);
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if (addr == reinterpret_cast<uptr>(base_)) {
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if (size == size_) {
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// Destroying the vmar effectively unmaps the whole mapping.
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_zx_vmar_destroy(vmar);
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_zx_handle_close(vmar);
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os_handle_ = static_cast<uptr>(ZX_HANDLE_INVALID);
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DecreaseTotalMmap(size);
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return;
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}
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} else {
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CHECK_EQ(addr + size, reinterpret_cast<uptr>(base_) + size_);
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}
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// Partial unmapping does not affect the fact that the initial range is still
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// reserved, and the resulting unmapped memory can't be reused.
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UnmapOrDieVmar(reinterpret_cast<void *>(addr), size, vmar);
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}
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// This should never be called.
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void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
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UNIMPLEMENTED();
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}
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void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
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const char *mem_type) {
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CHECK_GE(size, PAGE_SIZE);
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CHECK(IsPowerOfTwo(size));
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CHECK(IsPowerOfTwo(alignment));
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zx_handle_t vmo;
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zx_status_t status = _zx_vmo_create(size, 0, &vmo);
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if (status != ZX_OK) {
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if (status != ZX_ERR_NO_MEMORY)
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ReportMmapFailureAndDie(size, mem_type, "zx_vmo_create", status, false);
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return nullptr;
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}
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_zx_object_set_property(vmo, ZX_PROP_NAME, mem_type,
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internal_strlen(mem_type));
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// TODO(mcgrathr): Maybe allocate a VMAR for all sanitizer heap and use that?
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// Map a larger size to get a chunk of address space big enough that
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// it surely contains an aligned region of the requested size. Then
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// overwrite the aligned middle portion with a mapping from the
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// beginning of the VMO, and unmap the excess before and after.
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size_t map_size = size + alignment;
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uintptr_t addr;
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status =
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_zx_vmar_map(_zx_vmar_root_self(), ZX_VM_PERM_READ | ZX_VM_PERM_WRITE, 0,
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vmo, 0, map_size, &addr);
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if (status == ZX_OK) {
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uintptr_t map_addr = addr;
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uintptr_t map_end = map_addr + map_size;
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addr = RoundUpTo(map_addr, alignment);
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uintptr_t end = addr + size;
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if (addr != map_addr) {
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zx_info_vmar_t info;
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status = _zx_object_get_info(_zx_vmar_root_self(), ZX_INFO_VMAR, &info,
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sizeof(info), NULL, NULL);
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if (status == ZX_OK) {
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uintptr_t new_addr;
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status = _zx_vmar_map(
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_zx_vmar_root_self(),
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ZX_VM_PERM_READ | ZX_VM_PERM_WRITE | ZX_VM_SPECIFIC_OVERWRITE,
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addr - info.base, vmo, 0, size, &new_addr);
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if (status == ZX_OK) CHECK_EQ(new_addr, addr);
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}
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}
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if (status == ZX_OK && addr != map_addr)
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status = _zx_vmar_unmap(_zx_vmar_root_self(), map_addr, addr - map_addr);
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if (status == ZX_OK && end != map_end)
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status = _zx_vmar_unmap(_zx_vmar_root_self(), end, map_end - end);
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}
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_zx_handle_close(vmo);
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if (status != ZX_OK) {
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if (status != ZX_ERR_NO_MEMORY)
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ReportMmapFailureAndDie(size, mem_type, "zx_vmar_map", status, false);
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return nullptr;
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}
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IncreaseTotalMmap(size);
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return reinterpret_cast<void *>(addr);
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}
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void UnmapOrDie(void *addr, uptr size) {
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UnmapOrDieVmar(addr, size, _zx_vmar_root_self());
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}
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// This is used on the shadow mapping, which cannot be changed.
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// Zircon doesn't have anything like MADV_DONTNEED.
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void ReleaseMemoryPagesToOS(uptr beg, uptr end) {}
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void DumpProcessMap() {
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// TODO(mcgrathr): write it
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return;
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}
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bool IsAccessibleMemoryRange(uptr beg, uptr size) {
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// TODO(mcgrathr): Figure out a better way.
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zx_handle_t vmo;
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zx_status_t status = _zx_vmo_create(size, 0, &vmo);
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if (status == ZX_OK) {
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status = _zx_vmo_write(vmo, reinterpret_cast<const void *>(beg), 0, size);
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_zx_handle_close(vmo);
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}
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return status == ZX_OK;
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}
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// FIXME implement on this platform.
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void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size) {}
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bool ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
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uptr *read_len, uptr max_len, error_t *errno_p) {
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zx_handle_t vmo;
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zx_status_t status = __sanitizer_get_configuration(file_name, &vmo);
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if (status == ZX_OK) {
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uint64_t vmo_size;
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status = _zx_vmo_get_size(vmo, &vmo_size);
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if (status == ZX_OK) {
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if (vmo_size < max_len) max_len = vmo_size;
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size_t map_size = RoundUpTo(max_len, PAGE_SIZE);
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uintptr_t addr;
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status = _zx_vmar_map(_zx_vmar_root_self(), ZX_VM_PERM_READ, 0, vmo, 0,
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map_size, &addr);
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if (status == ZX_OK) {
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*buff = reinterpret_cast<char *>(addr);
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*buff_size = map_size;
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*read_len = max_len;
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}
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}
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_zx_handle_close(vmo);
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}
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if (status != ZX_OK && errno_p) *errno_p = status;
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return status == ZX_OK;
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}
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void RawWrite(const char *buffer) {
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constexpr size_t size = 128;
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static _Thread_local char line[size];
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static _Thread_local size_t lastLineEnd = 0;
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static _Thread_local size_t cur = 0;
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while (*buffer) {
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if (cur >= size) {
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if (lastLineEnd == 0)
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lastLineEnd = size;
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__sanitizer_log_write(line, lastLineEnd);
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internal_memmove(line, line + lastLineEnd, cur - lastLineEnd);
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cur = cur - lastLineEnd;
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lastLineEnd = 0;
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}
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if (*buffer == '\n')
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lastLineEnd = cur + 1;
|
|
line[cur++] = *buffer++;
|
|
}
|
|
// Flush all complete lines before returning.
|
|
if (lastLineEnd != 0) {
|
|
__sanitizer_log_write(line, lastLineEnd);
|
|
internal_memmove(line, line + lastLineEnd, cur - lastLineEnd);
|
|
cur = cur - lastLineEnd;
|
|
lastLineEnd = 0;
|
|
}
|
|
}
|
|
|
|
void CatastrophicErrorWrite(const char *buffer, uptr length) {
|
|
__sanitizer_log_write(buffer, length);
|
|
}
|
|
|
|
char **StoredArgv;
|
|
char **StoredEnviron;
|
|
|
|
char **GetArgv() { return StoredArgv; }
|
|
char **GetEnviron() { return StoredEnviron; }
|
|
|
|
const char *GetEnv(const char *name) {
|
|
if (StoredEnviron) {
|
|
uptr NameLen = internal_strlen(name);
|
|
for (char **Env = StoredEnviron; *Env != 0; Env++) {
|
|
if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
|
|
return (*Env) + NameLen + 1;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) {
|
|
const char *argv0 = "<UNKNOWN>";
|
|
if (StoredArgv && StoredArgv[0]) {
|
|
argv0 = StoredArgv[0];
|
|
}
|
|
internal_strncpy(buf, argv0, buf_len);
|
|
return internal_strlen(buf);
|
|
}
|
|
|
|
uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
|
|
return ReadBinaryName(buf, buf_len);
|
|
}
|
|
|
|
uptr MainThreadStackBase, MainThreadStackSize;
|
|
|
|
bool GetRandom(void *buffer, uptr length, bool blocking) {
|
|
CHECK_LE(length, ZX_CPRNG_DRAW_MAX_LEN);
|
|
_zx_cprng_draw(buffer, length);
|
|
return true;
|
|
}
|
|
|
|
u32 GetNumberOfCPUs() {
|
|
return zx_system_get_num_cpus();
|
|
}
|
|
|
|
uptr GetRSS() { UNIMPLEMENTED(); }
|
|
|
|
void InitializePlatformCommonFlags(CommonFlags *cf) {}
|
|
|
|
} // namespace __sanitizer
|
|
|
|
using namespace __sanitizer;
|
|
|
|
extern "C" {
|
|
void __sanitizer_startup_hook(int argc, char **argv, char **envp,
|
|
void *stack_base, size_t stack_size) {
|
|
__sanitizer::StoredArgv = argv;
|
|
__sanitizer::StoredEnviron = envp;
|
|
__sanitizer::MainThreadStackBase = reinterpret_cast<uintptr_t>(stack_base);
|
|
__sanitizer::MainThreadStackSize = stack_size;
|
|
}
|
|
|
|
void __sanitizer_set_report_path(const char *path) {
|
|
// Handle the initialization code in each sanitizer, but no other calls.
|
|
// This setting is never consulted on Fuchsia.
|
|
DCHECK_EQ(path, common_flags()->log_path);
|
|
}
|
|
|
|
void __sanitizer_set_report_fd(void *fd) {
|
|
UNREACHABLE("not available on Fuchsia");
|
|
}
|
|
|
|
const char *__sanitizer_get_report_path() {
|
|
UNREACHABLE("not available on Fuchsia");
|
|
}
|
|
} // extern "C"
|
|
|
|
#endif // SANITIZER_FUCHSIA
|