61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
#include <unicorn/unicorn.h>
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// code to be emulated
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#define X86_CODE32 "\x0F\x34" // SYSENTER
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// memory address where emulation starts
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#define ADDRESS 0x1000000
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int got_sysenter = 0;
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void sysenter (uc_engine *uc, void *user) {
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printf ("SYSENTER hook called.\n");
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got_sysenter = 1;
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}
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int main(int argc, char **argv, char **envp)
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{
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uc_engine *uc;
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uc_err err;
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uc_hook sysenterHook;
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// Initialize emulator in X86-32bit mode
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err = uc_open(UC_ARCH_X86, UC_MODE_32, &uc);
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if (err != UC_ERR_OK) {
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printf("Failed on uc_open() with error returned: %u\n", err);
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return -1;
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}
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// map 2MB memory for this emulation
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uc_mem_map(uc, ADDRESS, 2 * 1024 * 1024, UC_PROT_ALL);
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// write machine code to be emulated to memory
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if (uc_mem_write(uc, ADDRESS, X86_CODE32, sizeof(X86_CODE32) - 1)) {
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printf("Failed to write emulation code to memory, quit!\n");
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return -1;
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}
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// Hook the SYSENTER instructions
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if (uc_hook_add (uc, &sysenterHook, UC_HOOK_INSN, sysenter, NULL, 1, 0, UC_X86_INS_SYSENTER) != UC_ERR_OK) {
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printf ("Cannot hook SYSENTER instruction\n.");
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return -1;
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}
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// emulate code in infinite time & unlimited instructions
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err=uc_emu_start(uc, ADDRESS, ADDRESS + sizeof(X86_CODE32) - 1, 0, 0);
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if (err) {
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printf("Failed on uc_emu_start() with error returned %u: %s\n",
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err, uc_strerror(err));
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}
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printf("Emulation done.\n");
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uc_close(uc);
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if (!got_sysenter) {
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printf ("[!] ERROR : SYSENTER hook not called.\n");
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return -1;
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}
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return 0;
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}
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