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//===-- sanitizer_procmaps_fuchsia.cpp
//----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Information about the process mappings (Fuchsia-specific parts).
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_FUCHSIA
#include <zircon/process.h>
#include <zircon/syscalls.h>
#include "sanitizer_common.h"
#include "sanitizer_procmaps.h"
namespace __sanitizer {
// The cache flag is ignored on Fuchsia because a process can always get this
// information via its process-self handle.
MemoryMappingLayout::MemoryMappingLayout(bool) { Reset(); }
void MemoryMappingLayout::Reset() {
data_.data.clear();
data_.current = 0;
size_t count;
zx_status_t status = _zx_object_get_info(
_zx_process_self(), ZX_INFO_PROCESS_MAPS, nullptr, 0, nullptr, &count);
if (status != ZX_OK) {
return;
}
size_t filled;
do {
data_.data.resize(count);
status = _zx_object_get_info(
_zx_process_self(), ZX_INFO_PROCESS_MAPS, data_.data.data(),
count * sizeof(zx_info_maps_t), &filled, &count);
if (status != ZX_OK) {
data_.data.clear();
return;
}
} while (filled < count);
}
MemoryMappingLayout::~MemoryMappingLayout() {}
bool MemoryMappingLayout::Error() const { return data_.data.empty(); }
bool MemoryMappingLayout::Next(MemoryMappedSegment *segment) {
while (data_.current < data_.data.size()) {
const auto &entry = data_.data[data_.current++];
if (entry.type == ZX_INFO_MAPS_TYPE_MAPPING) {
segment->start = entry.base;
segment->end = entry.base + entry.size;
segment->offset = entry.u.mapping.vmo_offset;
const auto flags = entry.u.mapping.mmu_flags;
segment->protection =
((flags & ZX_VM_PERM_READ) ? kProtectionRead : 0) |
((flags & ZX_VM_PERM_WRITE) ? kProtectionWrite : 0) |
((flags & ZX_VM_PERM_EXECUTE) ? kProtectionExecute : 0);
if (segment->filename && segment->filename_size > 0) {
uptr len = Min(sizeof(entry.name), segment->filename_size) - 1;
internal_strncpy(segment->filename, entry.name, len);
segment->filename[len] = 0;
}
return true;
}
}
return false;
}
} // namespace __sanitizer
#endif // SANITIZER_FUCHSIA
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