121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
#include <unicorn/unicorn.h>
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#include <string.h>
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#include <stdio.h>
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int syscall_abi[] = {UC_X86_REG_RAX, UC_X86_REG_RDI, UC_X86_REG_RSI,
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UC_X86_REG_RDX, UC_X86_REG_R10, UC_X86_REG_R8,
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UC_X86_REG_R9};
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uint64_t vals[7] = {200, 10, 11, 12, 13, 14, 15};
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// This part of the API is less... clean... because Unicorn supports arbitrary
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// register types. So the least intrusive solution is passing individual
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// pointers. On the plus side, you only need to make this pointer array once.
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void *ptrs[7];
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void uc_perror(const char *func, uc_err err)
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{
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fprintf(stderr, "Error in %s(): %s\n", func, uc_strerror(err));
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}
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#define BASE 0x10000
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// mov rax, 100; mov rdi, 1; mov rsi, 2; mov rdx, 3; mov r10, 4; mov r8, 5; mov
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// r9, 6; syscall
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#define CODE \
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"\x48\xc7\xc0\x64\x00\x00\x00\x48\xc7\xc7\x01\x00\x00\x00\x48\xc7\xc6\x02" \
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"\x00\x00\x00\x48\xc7\xc2\x03\x00\x00\x00\x49\xc7\xc2\x04\x00\x00\x00\x49" \
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"\xc7\xc0\x05\x00\x00\x00\x49\xc7\xc1\x06\x00\x00\x00\x0f\x05"
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void hook_syscall(uc_engine *uc, void *user_data)
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{
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int i;
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uc_reg_read_batch(uc, syscall_abi, ptrs, 7);
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printf("syscall: {");
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for (i = 0; i < 7; i++) {
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if (i != 0)
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printf(", ");
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printf("%" PRIu64, vals[i]);
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}
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printf("}\n");
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}
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void hook_code(uc_engine *uc, uint64_t addr, uint32_t size, void *user_data)
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{
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printf("HOOK_CODE: 0x%" PRIx64 ", 0x%x\n", addr, size);
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}
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int main()
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{
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int i;
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uc_hook sys_hook;
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uc_err err;
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uc_engine *uc;
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// set up register pointers
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for (i = 0; i < 7; i++) {
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ptrs[i] = &vals[i];
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}
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if ((err = uc_open(UC_ARCH_X86, UC_MODE_64, &uc))) {
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uc_perror("uc_open", err);
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return 1;
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}
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// reg_write_batch
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printf("reg_write_batch({200, 10, 11, 12, 13, 14, 15})\n");
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if ((err = uc_reg_write_batch(uc, syscall_abi, ptrs, 7))) {
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uc_perror("uc_reg_write_batch", err);
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return 1;
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}
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// reg_read_batch
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memset(vals, 0, sizeof(vals));
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if ((err = uc_reg_read_batch(uc, syscall_abi, ptrs, 7))) {
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uc_perror("uc_reg_read_batch", err);
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return 1;
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}
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printf("reg_read_batch = {");
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for (i = 0; i < 7; i++) {
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if (i != 0)
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printf(", ");
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printf("%" PRIu64, vals[i]);
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}
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printf("}\n");
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// syscall
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printf("\n");
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printf("running syscall shellcode\n");
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if ((err = uc_hook_add(uc, &sys_hook, UC_HOOK_INSN, hook_syscall, NULL, 1,
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0, UC_X86_INS_SYSCALL))) {
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uc_perror("uc_hook_add", err);
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return 1;
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}
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if ((err = uc_mem_map(uc, BASE, 0x1000, UC_PROT_ALL))) {
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uc_perror("uc_mem_map", err);
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return 1;
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}
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if ((err = uc_mem_write(uc, BASE, CODE, sizeof(CODE) - 1))) {
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uc_perror("uc_mem_write", err);
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return 1;
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}
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if ((err = uc_emu_start(uc, BASE, BASE + sizeof(CODE) - 1, 0, 0))) {
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uc_perror("uc_emu_start", err);
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return 1;
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}
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uc_close(uc);
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return 0;
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}
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