1:5 *l4( (  fB- |5_I|+#|/* Write the contents of the into kernel symbol system_extra_cert * * Copyright (C) IBM Corporation, 2015 * * Author: Mehmet Kayaalp * * This software may be used and distributed according to the terms * of the GNU General Public License, incorporated herein by reference. * * Usage: insert-sys-cert [-s -b -c */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define CERT_SYM "system_extra_cert" #define USED_SYM "system_extra_cert_used" #define LSIZE_SYM "system_certificate_list_size" #define info(format, args...) fprintf(stderr, "INFO: " format, ## args) #define warn(format, args...) fprintf(stdout, "WARNING: " format, ## args) #define err(format, args...) fprintf(stderr, "ERROR: " format, ## args) #if UINTPTR_MAX == 0xffffffff #define CURRENT_ELFCLASS ELFCLASS32 #define Elf_Ehdr Elf32_Ehdr #define Elf_Shdr Elf32_Shdr #define Elf_Sym Elf32_Sym #else #define CURRENT_ELFCLASS ELFCLASS64 #define Elf_Ehdr Elf64_Ehdr #define Elf_Shdr Elf64_Shdr #define Elf_Sym Elf64_Sym #endif static unsigned char endianness(void) { uint16_t two_byte = 0x00FF; uint8_t low_address = *((uint8_t *)&two_byte); if (low_address == 0) return ELFDATA2MSB; else return ELFDATA2LSB; } struct sym { char *name; unsigned long address; unsigned long offset; void *content; int size; }; static unsigned long get_offset_from_address(Elf_Ehdr *hdr, unsigned long addr) { Elf_Shdr *x; unsigned int i, num_sections; x = (void *)hdr + hdr->e_shoff; if (hdr->e_shnum == SHN_UNDEF) num_sections = x[0].sh_size; else num_sections = hdr->e_shnum; for (i = 1; i < num_sections; i++) { unsigned long start = x[i].sh_addr; unsigned long end = start + x[i].sh_size; unsigned long offset = x[i].sh_offset; if (addr >= start && addr <= end) return addr - start + offset; } return 0; } #define LINE_SIZE 100 static void get_symbol_from_map(Elf_Ehdr *hdr, FILE *f, char *name, struct sym *s) { char l[LINE_SIZE]; char *w, *p, *n; s->size = 0; s->address = 0; s->offset = 0; if (fseek(f, 0, SEEK_SET) != 0) { perror("File seek failed"); exit(EXIT_FAILURE); } while (fgets(l, LINE_SIZE, f)) { p = strchr(l, '\n'); if (!p) { err("Missing line ending.\n"); return; } n = strstr(l, name); if (n) break; } if (!n) { err("Unable to find symbol: %s\n", name); return; } w = strchr(l, ' '); if (!w) return; *w = '\0'; s->address = strtoul(l, NULL, 16); if (s->address == 0) return; s->offset = get_offset_from_address(hdr, s->address); s->name = name; s->content = (void *)hdr + s->offset; } static Elf_Sym *find_elf_symbol(Elf_Ehdr *hdr, Elf_Shdr *symtab, char *name) { Elf_Sym *sym, *symtab_start; char *strtab, *symname; unsigned int link; Elf_Shdr *x; int i, n; x = (void *)hdr + hdr->e_shoff; link = symtab->sh_link; symtab_start = (void *)hdr + symtab->sh_offset; n = symtab->sh_size / symtab->sh_entsize; strtab = (void *)hdr + x[link].sh_offset; for (i = 0; i < n; i++) { sym = &symtab_start[i]; symname = strtab + sym->st_name; if (strcmp(symname, name) == 0) return sym; } err("Unable to find symbol: %s\n", name); return NULL; } static void get_symbol_from_table(Elf_Ehdr *hdr, Elf_Shdr *symtab, char *name, struct sym *s) { Elf_Shdr *sec; int secndx; Elf_Sym *elf_sym; Elf_Shdr *x; x = (void *)hdr + hdr->e_shoff; s->size = 0; s->address = 0; s->offset = 0; elf_sym = find_elf_symbol(hdr, symtab, name); if (!elf_sym) return; secndx = elf_sym->st_shndx; if (!secndx) return; sec = &x[secndx]; s->size = elf_sym->st_size; s->address = elf_sym->st_value; s->offset = s->address - sec->sh_addr + sec->sh_offset; s->name = name; s->content = (void