// return 0 if error static long unsigned int read_elf32(int fd) { Elf32_Ehdr ehdr32; Elf32_Shdr shdr32; off_t last_shdr_offset; ssize_t ret; unsigned long sht_end, last_section_end; ret = pread(fd, &ehdr32, sizeof(ehdr32), 0); if (ret < 0 || (size_t)ret != sizeof(ehdr)) return 0; ehdr.e_shoff = file32_to_cpu(ehdr32.e_shoff); ehdr.e_shentsize = file16_to_cpu(ehdr32.e_shentsize); ehdr.e_shnum = file16_to_cpu(ehdr32.e_shnum); last_shdr_offset = ehdr.e_shoff + (ehdr.e_shentsize * (ehdr.e_shnum - 1)); ret = pread(fd, &shdr32, sizeof(shdr32), last_shdr_offset); if (ret < 0 || (size_t)ret != sizeof(shdr32)) return 0; /* ELF ends either with the table of section headers (SHT) or with a section. */ sht_end = ehdr.e_shoff + (ehdr.e_shentsize * ehdr.e_shnum); last_section_end = file64_to_cpu(shdr32.sh_offset) + file64_to_cpu(shdr32.sh_size); return sht_end > last_section_end ? sht_end : last_section_end; }
static void read_elf32(int fd) { Elf32_Ehdr ehdr32; Elf32_Phdr *phdr32; size_t phdrs32_size; ssize_t ret, i; ret = pread(fd, &ehdr32, sizeof(ehdr32), 0); if (ret != sizeof(ehdr32)) { fprintf(stderr, "Read of Elf header from %s failed: %s\n", fname, strerror(errno)); exit(10); } ehdr.e_type = file16_to_cpu(ehdr32.e_type); ehdr.e_machine = file16_to_cpu(ehdr32.e_machine); ehdr.e_version = file32_to_cpu(ehdr32.e_version); ehdr.e_entry = file32_to_cpu(ehdr32.e_entry); ehdr.e_phoff = file32_to_cpu(ehdr32.e_phoff); ehdr.e_shoff = file32_to_cpu(ehdr32.e_shoff); ehdr.e_flags = file32_to_cpu(ehdr32.e_flags); ehdr.e_ehsize = file16_to_cpu(ehdr32.e_ehsize); ehdr.e_phentsize = file16_to_cpu(ehdr32.e_phentsize); ehdr.e_phnum = file16_to_cpu(ehdr32.e_phnum); ehdr.e_shentsize = file16_to_cpu(ehdr32.e_shentsize); ehdr.e_shnum = file16_to_cpu(ehdr32.e_shnum); ehdr.e_shstrndx = file16_to_cpu(ehdr32.e_shstrndx); if (ehdr.e_version != EV_CURRENT) { fprintf(stderr, "Bad Elf header version %u\n", ehdr.e_version); exit(11); } if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) { fprintf(stderr, "Bad Elf progra header size %u expected %zu\n", ehdr.e_phentsize, sizeof(Elf32_Phdr)); exit(12); } phdrs32_size = ehdr.e_phnum * sizeof(Elf32_Phdr); phdr32 = calloc(ehdr.e_phnum, sizeof(Elf32_Phdr)); if (!phdr32) { fprintf(stderr, "Calloc of %u phdrs32 failed: %s\n", ehdr.e_phnum, strerror(errno)); exit(14); } phdr = calloc(ehdr.e_phnum, sizeof(Elf64_Phdr)); if (!phdr) { fprintf(stderr, "Calloc of %u phdrs failed: %s\n", ehdr.e_phnum, strerror(errno)); exit(15); } ret = pread(fd, phdr32, phdrs32_size, ehdr.e_phoff); if (ret < 0 || (size_t)ret != phdrs32_size) { fprintf(stderr, "Read of program header @ 0x%llu for %zu bytes failed: %s\n", (unsigned long long)ehdr.e_phoff, phdrs32_size, strerror(errno)); exit(16); } for (i = 0; i < ehdr.e_phnum; i++) { phdr[i].p_type = file32_to_cpu(phdr32[i].p_type); phdr[i].p_offset = file32_to_cpu(phdr32[i].p_offset); phdr[i].p_vaddr = file32_to_cpu(phdr32[i].p_vaddr); phdr[i].p_paddr = file32_to_cpu(phdr32[i].p_paddr); phdr[i].p_filesz = file32_to_cpu(phdr32[i].p_filesz); phdr[i].p_memsz = file32_to_cpu(phdr32[i].p_memsz); phdr[i].p_flags = file32_to_cpu(phdr32[i].p_flags); phdr[i].p_align = file32_to_cpu(phdr32[i].p_align); } free(phdr32); }
static inline uint16_t struct_val_u16(char *ptr, unsigned int offset) { return(file16_to_cpu(*(uint16_t *)(ptr + offset))); }