81 lines · cpp
1//===-- sanitizer_procmaps_fuchsia.cpp2//----------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9//10// Information about the process mappings (Fuchsia-specific parts).11//===----------------------------------------------------------------------===//12 13#include "sanitizer_platform.h"14#if SANITIZER_FUCHSIA15#include <zircon/process.h>16#include <zircon/syscalls.h>17 18#include "sanitizer_common.h"19#include "sanitizer_procmaps.h"20 21namespace __sanitizer {22 23// The cache flag is ignored on Fuchsia because a process can always get this24// information via its process-self handle.25MemoryMappingLayout::MemoryMappingLayout(bool) { Reset(); }26 27void MemoryMappingLayout::Reset() {28 data_.data.clear();29 data_.current = 0;30 31 size_t count;32 zx_status_t status = _zx_object_get_info(33 _zx_process_self(), ZX_INFO_PROCESS_MAPS, nullptr, 0, nullptr, &count);34 if (status != ZX_OK) {35 return;36 }37 38 size_t filled;39 do {40 data_.data.resize(count);41 status = _zx_object_get_info(42 _zx_process_self(), ZX_INFO_PROCESS_MAPS, data_.data.data(),43 count * sizeof(zx_info_maps_t), &filled, &count);44 if (status != ZX_OK) {45 data_.data.clear();46 return;47 }48 } while (filled < count);49}50 51MemoryMappingLayout::~MemoryMappingLayout() {}52 53bool MemoryMappingLayout::Error() const { return data_.data.empty(); }54 55bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {56 while (data_.current < data_.data.size()) {57 const auto &entry = data_.data[data_.current++];58 if (entry.type == ZX_INFO_MAPS_TYPE_MAPPING) {59 segment->start = entry.base;60 segment->end = entry.base + entry.size;61 segment->offset = entry.u.mapping.vmo_offset;62 const auto flags = entry.u.mapping.mmu_flags;63 segment->protection =64 ((flags & ZX_VM_PERM_READ) ? kProtectionRead : 0) |65 ((flags & ZX_VM_PERM_WRITE) ? kProtectionWrite : 0) |66 ((flags & ZX_VM_PERM_EXECUTE) ? kProtectionExecute : 0);67 if (segment->filename && segment->filename_size > 0) {68 uptr len = Min(sizeof(entry.name), segment->filename_size) - 1;69 internal_strncpy(segment->filename, entry.name, len);70 segment->filename[len] = 0;71 }72 return true;73 }74 }75 return false;76}77 78} // namespace __sanitizer79 80#endif // SANITIZER_FUCHSIA81