| //===-- MachVMRegion.cpp ----------------------------------------*- C++ -*-===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Created by Greg Clayton on 6/26/07. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MachVMRegion.h" |
| #include "DNBLog.h" |
| #include <assert.h> |
| #include <mach/mach_vm.h> |
| |
| MachVMRegion::MachVMRegion(task_t task) |
| : m_task(task), m_addr(INVALID_NUB_ADDRESS), m_err(), |
| m_start(INVALID_NUB_ADDRESS), m_size(0), m_depth(-1), |
| m_curr_protection(0), m_protection_addr(INVALID_NUB_ADDRESS), |
| m_protection_size(0) { |
| memset(&m_data, 0, sizeof(m_data)); |
| } |
| |
| MachVMRegion::~MachVMRegion() { |
| // Restore any original protections and clear our vars |
| Clear(); |
| } |
| |
| void MachVMRegion::Clear() { |
| RestoreProtections(); |
| m_addr = INVALID_NUB_ADDRESS; |
| m_err.Clear(); |
| m_start = INVALID_NUB_ADDRESS; |
| m_size = 0; |
| m_depth = -1; |
| memset(&m_data, 0, sizeof(m_data)); |
| m_curr_protection = 0; |
| m_protection_addr = INVALID_NUB_ADDRESS; |
| m_protection_size = 0; |
| } |
| |
| bool MachVMRegion::SetProtections(mach_vm_address_t addr, mach_vm_size_t size, |
| vm_prot_t prot) { |
| if (ContainsAddress(addr)) { |
| mach_vm_size_t prot_size = size; |
| mach_vm_address_t end_addr = EndAddress(); |
| if (prot_size > (end_addr - addr)) |
| prot_size = end_addr - addr; |
| |
| if (prot_size > 0) { |
| if (prot == (m_curr_protection & VM_PROT_ALL)) { |
| DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS | LOG_VERBOSE, |
| "MachVMRegion::%s: protections (%u) already " |
| "sufficient for task 0x%4.4x at address 0x%8.8llx) ", |
| __FUNCTION__, prot, m_task, (uint64_t)addr); |
| // Protections are already set as requested... |
| return true; |
| } else { |
| m_err = ::mach_vm_protect(m_task, addr, prot_size, 0, prot); |
| if (DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS)) |
| m_err.LogThreaded("::mach_vm_protect ( task = 0x%4.4x, addr = " |
| "0x%8.8llx, size = %llu, set_max = %i, prot = %u )", |
| m_task, (uint64_t)addr, (uint64_t)prot_size, 0, |
| prot); |
| if (m_err.Fail()) { |
| // Try again with the ability to create a copy on write region |
| m_err = ::mach_vm_protect(m_task, addr, prot_size, 0, |
| prot | VM_PROT_COPY); |
| if (DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS) || m_err.Fail()) |
| m_err.LogThreaded("::mach_vm_protect ( task = 0x%4.4x, addr = " |
| "0x%8.8llx, size = %llu, set_max = %i, prot = %u " |
| ")", |
| m_task, (uint64_t)addr, (uint64_t)prot_size, 0, |
| prot | VM_PROT_COPY); |
| } |
| if (m_err.Success()) { |
| m_curr_protection = prot; |
| m_protection_addr = addr; |
| m_protection_size = prot_size; |
| return true; |
| } |
| } |
| } else { |
| DNBLogThreadedIf(LOG_MEMORY_PROTECTIONS | LOG_VERBOSE, |
| "%s: Zero size for task 0x%4.4x at address 0x%8.8llx) ", |
| __FUNCTION__, m_task, (uint64_t)addr); |
| } |
| } |
| return false; |
| } |
| |
| bool MachVMRegion::RestoreProtections() { |
| if (m_curr_protection != m_data.protection && m_protection_size > 0) { |
| m_err = ::mach_vm_protect(m_task, m_protection_addr, m_protection_size, 0, |
| m_data.protection); |
| if (DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS) || m_err.Fail()) |
| m_err.LogThreaded("::mach_vm_protect ( task = 0x%4.4x, addr = 0x%8.8llx, " |
| "size = %llu, set_max = %i, prot = %u )", |
| m_task, (uint64_t)m_protection_addr, |
| (uint64_t)m_protection_size, 0, m_data.protection); |
| if (m_err.Success()) { |
| m_protection_size = 0; |
| m_protection_addr = INVALID_NUB_ADDRESS; |
| m_curr_protection = m_data.protection; |
| return true; |
| } |
| } else { |
| m_err.Clear(); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool MachVMRegion::GetRegionForAddress(nub_addr_t addr) { |
| // Restore any original protections and clear our vars |
| Clear(); |
| m_err.Clear(); |
| m_addr = addr; |
| m_start = addr; |
| m_depth = 1024; |
| mach_msg_type_number_t info_size = kRegionInfoSize; |
| static_assert(sizeof(info_size) == 4, ""); |
| m_err = |
| ::mach_vm_region_recurse(m_task, &m_start, &m_size, &m_depth, |
| (vm_region_recurse_info_t)&m_data, &info_size); |
| |
| const bool failed = m_err.Fail(); |
| const bool log_protections = DNBLogCheckLogBit(LOG_MEMORY_PROTECTIONS); |
| |
| if (log_protections || failed) |
| m_err.LogThreaded("::mach_vm_region_recurse ( task = 0x%4.4x, address => " |
| "0x%8.8llx, size => %llu, nesting_depth => %d, info => " |
| "%p, infoCnt => %d) addr = 0x%8.8llx ", |
| m_task, (uint64_t)m_start, (uint64_t)m_size, m_depth, |
| &m_data, info_size, (uint64_t)addr); |
| |
| if (failed) |
| return false; |
| if (log_protections) { |
| DNBLogThreaded("info = { prot = %u, " |
| "max_prot = %u, " |
| "inheritance = 0x%8.8x, " |
| "offset = 0x%8.8llx, " |
| "user_tag = 0x%8.8x, " |
| "ref_count = %u, " |
| "shadow_depth = %u, " |
| "ext_pager = %u, " |
| "share_mode = %u, " |
| "is_submap = %d, " |
| "behavior = %d, " |
| "object_id = 0x%8.8x, " |
| "user_wired_count = 0x%4.4x }", |
| m_data.protection, m_data.max_protection, m_data.inheritance, |
| (uint64_t)m_data.offset, m_data.user_tag, m_data.ref_count, |
| m_data.shadow_depth, m_data.external_pager, |
| m_data.share_mode, m_data.is_submap, m_data.behavior, |
| m_data.object_id, m_data.user_wired_count); |
| } |
| m_curr_protection = m_data.protection; |
| |
| // We make a request for an address and got no error back, but this |
| // doesn't mean that "addr" is in the range. The data in this object will |
| // be valid though, so you could see where the next region begins. So we |
| // return false, yet leave "m_err" with a successfull return code. |
| return !((addr < m_start) || (addr >= (m_start + m_size))); |
| } |
| |
| uint32_t MachVMRegion::GetDNBPermissions() const { |
| if (m_addr == INVALID_NUB_ADDRESS || m_start == INVALID_NUB_ADDRESS || |
| m_size == 0) |
| return 0; |
| uint32_t dnb_permissions = 0; |
| |
| if ((m_data.protection & VM_PROT_READ) == VM_PROT_READ) |
| dnb_permissions |= eMemoryPermissionsReadable; |
| if ((m_data.protection & VM_PROT_WRITE) == VM_PROT_WRITE) |
| dnb_permissions |= eMemoryPermissionsWritable; |
| if ((m_data.protection & VM_PROT_EXECUTE) == VM_PROT_EXECUTE) |
| dnb_permissions |= eMemoryPermissionsExecutable; |
| return dnb_permissions; |
| } |
