printf("######################################################\n");
printf("# #\n");
printf("# IDA Pro 6.3 - ELF anti-debugging/reversing patcher #\n");
printf("# -nitr0us- #\n");
printf("# #\n");
printf("######################################################\n\n");
if(argc < 2){
fprintf(stderr, "Usage: %s <elf_file_to_patch>\n", argv[0]);
exit(-1);
}
if((fd =3D open(argv[1], O_RDWR)) =3D=3D -1){
perror("open");
exit(-1);
}
if(!isELF(fd)){
close(fd);
exit(-1);
}
// Mapping to memory only the necessary bytes [sizeof(header)]
if((header =3D (Elf32_Ehdr *) mmap(NULL, sizeof(header), PROT_READ | PRO=
T_WRITE, MAP_SHARED, fd, 0)) =3D=3D MAP_FAILED){
perror("mmap");
close(fd);
exit(-1);
}
printf("[*] The ELF file originally has:\n");
printf("[-] Ehdr->e_shnum: %5d (0x%.4x)\n", header->e_shnum, header->=
e_shnum);
printf("[-] Ehdr->e_shstrndx: %5d (0x%.4x)\n\n", header->e_shstrndx, hea=
der->e_shstrndx);
printf("[*] Patching \"%s\" with new random() values...\n\n", argv[1]);
srand(time(NULL)); // seed for rand()
new_shnum =3D (Elf32_Half) rand() % 0x1337;
new_shstrndx =3D (Elf32_Half) 0;
while(new_shstrndx < new_shnum)
new_shstrndx =3D (Elf32_Half) rand() % 0xDEAD;
header->e_shnum =3D new_shnum;
header->e_shstrndx =3D new_shstrndx;
// Synchronize the ELF in file system with the previous memory mapped
if(msync(NULL, 0, MS_SYNC) =3D=3D -1){
perror("msync");
close(fd);
exit(-1);
}
close(fd);
munmap(header, 0);
printf("[*] The patched ELF file now has:\n");
printf("[+] Ehdr->e_shnum: %5d (0x%.4x)\n", new_shnum, new_shnum);
printf("[+] Ehdr->e_shstrndx: %5d (0x%.4x)\n\n", new_shstrndx, new_shstr=
ndx);
printf("[*] IDA Pro 6.3 should crash trying to load \"%s\"\n", argv[1]);
return 0;
}
int isELF(int fd)
{
Elf32_Ehdrheader;
if(read(fd, &header, sizeof(header)) =3D=3D -1){
perror("isELF(): read");
return 0;
}
/* magic number verification */
if(memcmp(header.e_ident, e_magic, 4) !=3D 0){
fprintf(stderr, "The argument given is not an ELF file !\n");
return 0;
}
/* 32-bit class verification */
if(header.e_ident[4] !=3D ELFCLASS32){
fprintf(stderr, "Only 32-bit ELF files supported !\n");
return 0;
}
/* little-endian verification */
if(header.e_ident[5] !=3D ELFDATA2LSB){
fprintf(stderr, "Only little-endian ELF files supported !\n");
return 0;
}
return 1;
}
建议：
--------------------------------------------------------------------------------
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Hex-Rays
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