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- /*
- * A small little ldd implementation for uClibc
- *
- * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
- *
- * Several functions in this file (specifically, elf_find_section_type(),
- * elf_find_phdr_type(), and elf_find_dynamic(), were stolen from elflib.c from
- * elfvector (http://www.BitWagon.com/elfvector.html) by John F. Reiser
- * <jreiser@BitWagon.com>, which is copyright 2000 BitWagon Software LLC
- * (GPL2).
- *
- * Licensed under GPLv2 or later
- */
- #include "porting.h"
- #if defined(__kvx__)
- #define MATCH_MACHINE(x) (x == EM_KVX)
- #define ELFCLASSM ELFCLASS64
- #endif
- #if defined(__aarch64__)
- #define MATCH_MACHINE(x) (x == EM_AARCH64)
- #define ELFCLASSM ELFCLASS64
- #endif
- #if defined(__alpha__)
- #define MATCH_MACHINE(x) (x == EM_ALPHA)
- #define ELFCLASSM ELFCLASS64
- #endif
- #if defined(__arc__)
- #define MATCH_MACHINE(x) (x == EM_ARCOMPACT)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__arm__) || defined(__thumb__)
- #define MATCH_MACHINE(x) (x == EM_ARM)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__avr32__)
- #define MATCH_MACHINE(x) (x == EM_AVR32)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__bfin__)
- #define MATCH_MACHINE(x) (x == EM_BLACKFIN)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__TMS320C6X__)
- #define MATCH_MACHINE(x) (x == EM_TI_C6000)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__cris__)
- #define MATCH_MACHINE(x) (x == EM_CRIS)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__csky__)
- #define MATCH_MACHINE(x) (x == EM_MCORE)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__frv__)
- #define MATCH_MACHINE(x) (x == EM_CYGNUS_FRV)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__hppa__)
- #define MATCH_MACHINE(x) (x == EM_PARISC)
- #if defined(__LP64__)
- #define ELFCLASSM ELFCLASS64
- #else
- #define ELFCLASSM ELFCLASS32
- #endif
- #endif
- #if defined(__i386__)
- #ifndef EM_486
- #define MATCH_MACHINE(x) (x == EM_386)
- #else
- #define MATCH_MACHINE(x) (x == EM_386 || x == EM_486)
- #endif
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__ia64__)
- #define MATCH_MACHINE(x) (x == EM_IA_64)
- #define ELFCLASSM ELFCLASS64
- #endif
- #if defined(__mc68000__)
- #define MATCH_MACHINE(x) (x == EM_68K)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__metag__)
- #define MATCH_MACHINE(x) (x == EM_METAG)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__microblaze__)
- #define MATCH_MACHINE(x) (x == EM_MICROBLAZE)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__mips__)
- #define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__nds32__)
- #define MATCH_MACHINE(x) (x == EM_NDS32)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__nios2__)
- #define MATCH_MACHINE(x) (x == EM_NIOS32)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__powerpc__)
- #define MATCH_MACHINE(x) (x == EM_PPC)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__riscv)
- #define MATCH_MACHINE(x) (x == EM_RISCV)
- #define ELFCLASSM ELFCLASS64
- #endif
- #if defined(__sh__)
- #define MATCH_MACHINE(x) (x == EM_SH)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__sparc__)
- #define MATCH_MACHINE(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
- #define ELFCLASSM ELFCLASS32
- #endif
- #if defined(__x86_64__)
- #define MATCH_MACHINE(x) (x == EM_X86_64)
- #define ELFCLASSM ELFCLASS64
- #endif
- #if defined(__xtensa__)
- #define MATCH_MACHINE(x) (x == EM_XTENSA)
- #define ELFCLASSM ELFCLASS32
- #endif
- #ifndef MATCH_MACHINE
- # ifdef __linux__
- # include <asm/elf.h>
- # endif
- # ifdef ELF_ARCH
- # define MATCH_MACHINE(x) (x == ELF_ARCH)
- # endif
- # ifdef ELF_CLASS
- # define ELFCLASSM ELF_CLASS
- # endif
- #endif
- #ifndef MATCH_MACHINE
- # warning "You really should add a MATCH_MACHINE() macro for your architecture"
- #endif
- #if UCLIBC_ENDIAN_HOST == UCLIBC_ENDIAN_LITTLE
- #define ELFDATAM ELFDATA2LSB
- #elif UCLIBC_ENDIAN_HOST == UCLIBC_ENDIAN_BIG
- #define ELFDATAM ELFDATA2MSB
- #endif
- #define TRUSTED_LDSO UCLIBC_RUNTIME_PREFIX "lib/" UCLIBC_LDSO
- struct library {
- char *name;
- int resolved;
- char *path;
- struct library *next;
- };
- static struct library *lib_list = NULL;
- static char not_found[] = "not found";
- static char *interp_name = NULL;
- static char *interp_dir = NULL;
- static int byteswap;
- static int interpreter_already_found = 0;
- static __inline__ uint32_t byteswap32_to_host(uint32_t value)
- {
- if (byteswap) {
- return (bswap_32(value));
- } else {
- return (value);
- }
- }
- static __inline__ uint64_t byteswap64_to_host(uint64_t value)
- {
- if (byteswap) {
- return (bswap_64(value));
- } else {
- return (value);
- }
- }
- #if __WORDSIZE == 64
- # define byteswap_to_host(x) byteswap64_to_host(x)
- #else
- # define byteswap_to_host(x) byteswap32_to_host(x)
- #endif
- static ElfW(Shdr) *elf_find_section_type(uint32_t key, ElfW(Ehdr) *ehdr)
- {
- int j;
- ElfW(Shdr) *shdr;
- shdr = (ElfW(Shdr) *) (ehdr->e_shoff + (char *)ehdr);
- for (j = ehdr->e_shnum; --j >= 0; ++shdr) {
- if (key == byteswap32_to_host(shdr->sh_type)) {
- return shdr;
- }
- }
- return NULL;
- }
- static ElfW(Phdr) *elf_find_phdr_type(uint32_t type, ElfW(Ehdr) *ehdr)
- {
- int j;
- ElfW(Phdr) *phdr = (ElfW(Phdr) *) (ehdr->e_phoff + (char *)ehdr);
- for (j = ehdr->e_phnum; --j >= 0; ++phdr) {
- if (type == byteswap32_to_host(phdr->p_type)) {
- return phdr;
- }
- }
- return NULL;
- }
- /* Returns value if return_val==1, ptr otherwise */
- static void *elf_find_dynamic(int64_t const key, ElfW(Dyn) *dynp,
- ElfW(Ehdr) *ehdr, int return_val)
- {
- ElfW(Phdr) *pt_text = elf_find_phdr_type(PT_LOAD, ehdr);
- unsigned tx_reloc = byteswap_to_host(pt_text->p_vaddr) - byteswap_to_host(pt_text->p_offset);
- for (; DT_NULL != byteswap_to_host(dynp->d_tag); ++dynp) {
- if (key == byteswap_to_host(dynp->d_tag)) {
- if (return_val == 1)
- return (void *)byteswap_to_host(dynp->d_un.d_val);
- else
- return (void *)(byteswap_to_host(dynp->d_un.d_val) - tx_reloc + (char *)ehdr);
- }
- }
- return NULL;
- }
- static char *elf_find_rpath(ElfW(Ehdr) *ehdr, ElfW(Dyn) *dynamic)
- {
- ElfW(Dyn) *dyns;
- for (dyns = dynamic; byteswap_to_host(dyns->d_tag) != DT_NULL; ++dyns) {
- if (DT_RPATH == byteswap_to_host(dyns->d_tag)) {
- char *strtab;
- strtab = (char *)elf_find_dynamic(DT_STRTAB, dynamic, ehdr, 0);
- return ((char *)strtab + byteswap_to_host(dyns->d_un.d_val));
- }
- }
- return NULL;
- }
- static int check_elf_header(ElfW(Ehdr) *const ehdr)
- {
- if (!ehdr || *(uint32_t*)ehdr != ELFMAG_U32
- /* Use __WORDSIZE, not ELFCLASSM which depends on the host */
- || ehdr->e_ident[EI_CLASS] != (__WORDSIZE >> 5)
- || ehdr->e_ident[EI_VERSION] != EV_CURRENT
- ) {
- return 1;
- }
- /* Check if the target endianness matches the host's endianness */
- byteswap = !(ehdr->e_ident[5] == ELFDATAM);
- /* Be very lazy, and only byteswap the stuff we use */
- if (byteswap) {
- ehdr->e_type = bswap_16(ehdr->e_type);
- ehdr->e_phoff = byteswap_to_host(ehdr->e_phoff);
- ehdr->e_shoff = byteswap_to_host(ehdr->e_shoff);
- ehdr->e_phnum = bswap_16(ehdr->e_phnum);
- ehdr->e_shnum = bswap_16(ehdr->e_shnum);
- }
- return 0;
- }
- #ifdef __LDSO_CACHE_SUPPORT__
- static caddr_t cache_addr = NULL;
- static size_t cache_size = 0;
- static int map_cache(void)
- {
- int fd;
- struct stat st;
- header_t *header;
- libentry_t *libent;
- int i, strtabsize;
- if (cache_addr == (caddr_t) - 1)
- return -1;
- else if (cache_addr != NULL)
- return 0;
- if (stat(LDSO_CACHE, &st) || (fd = open(LDSO_CACHE, O_RDONLY)) < 0) {
- fprintf(stderr, "ldd: can't open cache '%s'\n", LDSO_CACHE);
- cache_addr = (caddr_t) - 1; /* so we won't try again */
- return -1;
- }
- cache_size = st.st_size;
- cache_addr = mmap(0, cache_size, PROT_READ, MAP_SHARED, fd, 0);
- close(fd);
- if (cache_addr == MAP_FAILED) {
- fprintf(stderr, "ldd: can't map cache '%s'\n", LDSO_CACHE);
- return -1;
- }
- header = (header_t *) cache_addr;
- if (cache_size < sizeof(header_t)
- || memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)
- || memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)
- || cache_size < (sizeof(header_t) + header->nlibs * sizeof(libentry_t))
- || cache_addr[cache_size - 1] != '\0')
- {
- fprintf(stderr, "ldd: cache '%s' is corrupt\n", LDSO_CACHE);
- goto fail;
- }
- strtabsize = cache_size - sizeof(header_t) - header->nlibs * sizeof(libentry_t);
- libent = (libentry_t *) & header[1];
- for (i = 0; i < header->nlibs; i++) {
- if (libent[i].sooffset >= strtabsize || libent[i].liboffset >= strtabsize) {
- fprintf(stderr, "ldd: cache '%s' is corrupt\n", LDSO_CACHE);
- goto fail;
- }
- }
- return 0;
- fail:
- munmap(cache_addr, cache_size);
- cache_addr = (caddr_t) - 1;
- return -1;
- }
- static int unmap_cache(void)
- {
- if (cache_addr == NULL || cache_addr == (caddr_t) - 1)
- return -1;
- #if 1
- munmap(cache_addr, cache_size);
- cache_addr = NULL;
- #endif
- return 0;
- }
- #else
- static __inline__ void map_cache(void)
- {
- }
- static __inline__ void unmap_cache(void)
- {
- }
- #endif
- /* This function's behavior must exactly match that
- * in uClibc/ldso/ldso/dl-elf.c */
- static void search_for_named_library(char *name, char *result,
- const char *path_list)
- {
- int i, count = 1;
- char *path, *path_n;
- struct stat filestat;
- /* We need a writable copy of this string */
- path = strdup(path_list);
- if (!path) {
- fprintf(stderr, "%s: Out of memory!\n", __func__);
- exit(EXIT_FAILURE);
- }
- /* Eliminate all double //s */
- path_n = path;
- while ((path_n = strstr(path_n, "//"))) {
- i = strlen(path_n);
- memmove(path_n, path_n + 1, i - 1);
- *(path_n + i - 1) = '\0';
- }
- /* Replace colons with zeros in path_list and count them */
- for (i = strlen(path); i > 0; i--) {
- if (path[i] == ':') {
- path[i] = 0;
- count++;
- }
- }
- path_n = path;
- for (i = 0; i < count; i++) {
- strcpy(result, path_n);
- strcat(result, "/");
- strcat(result, name);
- if (stat(result, &filestat) == 0 && filestat.st_mode & S_IRUSR) {
- free(path);
- return;
- }
- path_n += (strlen(path_n) + 1);
- }
- free(path);
- *result = '\0';
- }
- static void locate_library_file(ElfW(Ehdr) *ehdr, ElfW(Dyn) *dynamic,
- int is_suid, struct library *lib)
- {
- char *buf;
- char *path;
- struct stat filestat;
- /* If this is a fully resolved name, our job is easy */
- if (stat(lib->name, &filestat) == 0) {
- lib->path = strdup(lib->name);
- return;
- }
- /* We need some elbow room here. Make some room... */
- buf = malloc(1024);
- if (!buf) {
- fprintf(stderr, "%s: Out of memory!\n", __func__);
- exit(EXIT_FAILURE);
- }
- /* This function must match the behavior of _dl_load_shared_library
- * in readelflib1.c or things won't work out as expected... */
- /* The ABI specifies that RPATH is searched first, so do that now. */
- path = elf_find_rpath(ehdr, dynamic);
- if (path) {
- search_for_named_library(lib->name, buf, path);
- if (*buf != '\0') {
- lib->path = buf;
- return;
- }
- }
- /* Next check LD_{ELF_}LIBRARY_PATH if specified and allowed.
- * Since this app doesn't actually run an executable I will skip
- * the suid check, and just use LD_{ELF_}LIBRARY_PATH if set */
- if (is_suid == 1)
- path = NULL;
- else
- path = getenv("LD_LIBRARY_PATH");
- if (path) {
- search_for_named_library(lib->name, buf, path);
- if (*buf != '\0') {
- lib->path = buf;
- return;
- }
- }
- #ifdef __LDSO_CACHE_SUPPORT__
- if (cache_addr != NULL && cache_addr != (caddr_t) - 1) {
- int i;
- header_t *header = (header_t *) cache_addr;
- libentry_t *libent = (libentry_t *) & header[1];
- char *strs = (char *)&libent[header->nlibs];
- for (i = 0; i < header->nlibs; i++) {
- if ((libent[i].flags == LIB_ELF ||
- libent[i].flags == LIB_ELF_LIBC0 ||
- libent[i].flags == LIB_ELF_LIBC5) &&
- strcmp(lib->name, strs + libent[i].sooffset) == 0)
- {
- lib->path = strdup(strs + libent[i].liboffset);
- return;
- }
- }
- }
- #endif
- /* Next look for libraries wherever the shared library
- * loader was installed -- this is usually where we
- * should find things... */
- if (interp_dir) {
- search_for_named_library(lib->name, buf, interp_dir);
- if (*buf != '\0') {
- lib->path = buf;
- return;
- }
- }
- /* Lastly, search the standard list of paths for the library.
- This list must exactly match the list in uClibc/ldso/ldso/dl-elf.c */
- path = UCLIBC_RUNTIME_PREFIX "lib:" UCLIBC_RUNTIME_PREFIX "usr/lib"
- #ifndef __LDSO_CACHE_SUPPORT__
- ":" UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib"
- #endif
- ;
- search_for_named_library(lib->name, buf, path);
- if (*buf != '\0') {
- lib->path = buf;
- } else {
- free(buf);
- lib->path = not_found;
- }
- }
- static int add_library(ElfW(Ehdr) *ehdr, ElfW(Dyn) *dynamic, int is_setuid, char *s)
- {
- char *tmp, *tmp1, *tmp2;
- struct library *cur, *newlib = lib_list;
- if (!s || !strlen(s))
- return 1;
- tmp = s;
- while (*tmp) {
- if (*tmp == '/')
- s = tmp + 1;
- tmp++;
- }
- /* We add ldso elsewhere */
- if (interpreter_already_found && (tmp = strrchr(interp_name, '/')) != NULL) {
- int len = strlen(interp_dir);
- if (strcmp(s, interp_name + 1 + len) == 0)
- return 1;
- }
- for (cur = lib_list; cur; cur = cur->next) {
- /* Check if this library is already in the list */
- tmp1 = tmp2 = cur->name;
- if (!cur->name)
- continue;
- while (*tmp1) {
- if (*tmp1 == '/')
- tmp2 = tmp1 + 1;
- tmp1++;
- }
- if (strcmp(tmp2, s) == 0) {
- /*printf("find_elf_interpreter is skipping '%s' (already in list)\n", cur->name); */
- return 0;
- }
- }
- /* Ok, this lib needs to be added to the list */
- newlib = malloc(sizeof(struct library));
- if (!newlib)
- return 1;
- newlib->name = malloc(strlen(s) + 1);
- strcpy(newlib->name, s);
- newlib->resolved = 0;
- newlib->path = NULL;
- newlib->next = NULL;
- /* Now try and locate where this library might be living... */
- locate_library_file(ehdr, dynamic, is_setuid, newlib);
- /*printf("add_library is adding '%s' to '%s'\n", newlib->name, newlib->path); */
- if (!lib_list) {
- lib_list = newlib;
- } else {
- for (cur = lib_list; cur->next; cur = cur->next) ; /* nothing */
- cur->next = newlib;
- }
- return 0;
- }
- static void find_needed_libraries(ElfW(Ehdr) *ehdr, ElfW(Dyn) *dynamic, int is_setuid)
- {
- ElfW(Dyn) *dyns;
- for (dyns = dynamic; byteswap_to_host(dyns->d_tag) != DT_NULL; ++dyns) {
- if (DT_NEEDED == byteswap_to_host(dyns->d_tag)) {
- char *strtab;
- strtab = (char *)elf_find_dynamic(DT_STRTAB, dynamic, ehdr, 0);
- add_library(ehdr, dynamic, is_setuid, (char *)strtab + byteswap_to_host(dyns->d_un.d_val));
- }
- }
- }
- #ifdef __LDSO_LDD_SUPPORT__
- static struct library *find_elf_interpreter(ElfW(Ehdr) *ehdr)
- {
- ElfW(Phdr) *phdr;
- if (interpreter_already_found == 1)
- return NULL;
- phdr = elf_find_phdr_type(PT_INTERP, ehdr);
- if (phdr) {
- struct library *cur, *newlib = NULL;
- char *s = (char *)ehdr + byteswap_to_host(phdr->p_offset);
- char *tmp, *tmp1;
- interp_name = strdup(s);
- interp_dir = strdup(s);
- tmp = strrchr(interp_dir, '/');
- if (tmp)
- *tmp = '\0';
- else {
- free(interp_dir);
- interp_dir = interp_name;
- }
- tmp1 = tmp = s;
- while (*tmp) {
- if (*tmp == '/')
- tmp1 = tmp + 1;
- tmp++;
- }
- for (cur = lib_list; cur; cur = cur->next) {
- /* Check if this library is already in the list */
- if (!tmp1 || !cur->name)
- return NULL;
- if (strcmp(cur->name, tmp1) == 0) {
- /*printf("find_elf_interpreter is replacing '%s' (already in list)\n", cur->name); */
- newlib = cur;
- free(newlib->name);
- if (newlib->path != not_found) {
- free(newlib->path);
- }
- newlib->name = NULL;
- newlib->path = NULL;
- break;
- }
- }
- if (newlib == NULL)
- newlib = malloc(sizeof(struct library));
- if (!newlib)
- return NULL;
- newlib->name = malloc(strlen(s) + 1);
- strcpy(newlib->name, s);
- newlib->path = strdup(newlib->name);
- newlib->resolved = 1;
- newlib->next = NULL;
- #if 0
- /*printf("find_elf_interpreter is adding '%s' to '%s'\n", newlib->name, newlib->path); */
- if (!lib_list) {
- lib_list = newlib;
- } else {
- for (cur = lib_list; cur->next; cur = cur->next) ; /* nothing */
- cur->next = newlib;
- }
- #endif
- interpreter_already_found = 1;
- return newlib;
- }
- return NULL;
- }
- #endif /* __LDSO_LDD_SUPPORT__ */
- /* map the .so, and locate interesting pieces */
- /*
- #warning "There may be two warnings here about vfork() clobbering, ignore them"
- */
- static int find_dependencies(char *filename)
- {
- int is_suid = 0;
- FILE *thefile;
- struct stat statbuf;
- ElfW(Ehdr) *ehdr = NULL;
- ElfW(Shdr) *dynsec = NULL;
- ElfW(Dyn) *dynamic = NULL;
- #ifdef __LDSO_LDD_SUPPORT__
- struct library *interp;
- #endif
- if (filename == not_found)
- return 0;
- if (!filename) {
- fprintf(stderr, "No filename specified.\n");
- return -1;
- }
- if (!(thefile = fopen(filename, "r"))) {
- perror(filename);
- return -1;
- }
- if (fstat(fileno(thefile), &statbuf) < 0) {
- perror(filename);
- fclose(thefile);
- return -1;
- }
- if ((size_t) statbuf.st_size < sizeof(ElfW(Ehdr)))
- goto foo;
- if (!S_ISREG(statbuf.st_mode))
- goto foo;
- /* mmap the file to make reading stuff from it effortless */
- ehdr = mmap(0, statbuf.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fileno(thefile), 0);
- if (ehdr == MAP_FAILED) {
- fclose(thefile);
- fprintf(stderr, "mmap(%s) failed: %s\n", filename, strerror(errno));
- return -1;
- }
- foo:
- fclose(thefile);
- /* Check if this looks like a legit ELF file */
- if (check_elf_header(ehdr)) {
- fprintf(stderr, "%s: not an ELF file.\n", filename);
- return -1;
- }
- /* Check if this is the right kind of ELF file */
- if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) {
- fprintf(stderr, "%s: not a dynamic executable\n", filename);
- return -1;
- }
- if (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN) {
- if (statbuf.st_mode & S_ISUID)
- is_suid = 1;
- if ((statbuf.st_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP))
- is_suid = 1;
- /* FIXME */
- if (is_suid)
- fprintf(stderr, "%s: is setuid\n", filename);
- }
- interpreter_already_found = 0;
- #ifdef __LDSO_LDD_SUPPORT__
- interp = find_elf_interpreter(ehdr);
- if (interp
- && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN)
- && ehdr->e_ident[EI_CLASS] == ELFCLASSM
- && ehdr->e_ident[EI_DATA] == ELFDATAM
- && ehdr->e_ident[EI_VERSION] == EV_CURRENT
- && MATCH_MACHINE(ehdr->e_machine))
- {
- struct stat st;
- if (stat(interp->path, &st) == 0 && S_ISREG(st.st_mode)) {
- pid_t pid;
- int status;
- static const char *const environment[] = {
- "PATH=/usr/bin:/bin:/usr/sbin:/sbin",
- "SHELL=/bin/sh",
- "LD_TRACE_LOADED_OBJECTS=1",
- NULL
- };
- # ifdef __LDSO_STANDALONE_SUPPORT__
- char * lib_path = getenv("LD_LIBRARY_PATH");
- /* The 'extended' environment inclusing the LD_LIBRARY_PATH */
- static char *ext_environment[ARRAY_SIZE(environment) + 1];
- char **envp = (char **) environment;
- if (lib_path) {
- /*
- * If the LD_LIBRARY_PATH is set, it needs to include it
- * into the environment for the new process to be spawned
- */
- char ** eenvp = (char **) ext_environment;
- /* Copy the N-1 environment's entries */
- while (*envp)
- *eenvp++=*envp++;
- /* Make room for LD_LIBRARY_PATH */
- *eenvp = (char *) malloc(sizeof("LD_LIBRARY_PATH=")
- + strlen(lib_path));
- strcpy(*eenvp, "LD_LIBRARY_PATH=");
- strcat(*eenvp, lib_path);
- lib_path = *eenvp;
- /* ext_environment[size] is already NULL */
- /* Use the extended environment */
- envp = ext_environment;
- }
- if ((pid = vfork()) == 0) {
- /*
- * Force to use the standard dynamic linker in stand-alone mode.
- * It will fails at runtime if support is not actually available
- */
- execle(TRUSTED_LDSO, TRUSTED_LDSO, filename, NULL, envp);
- _exit(0xdead);
- }
- # else
- if ((pid = vfork()) == 0) {
- /* Cool, it looks like we should be able to actually
- * run this puppy. Do so now... */
- execle(filename, filename, NULL, environment);
- _exit(0xdead);
- }
- # endif
- /* Wait till it returns */
- waitpid(pid, &status, 0);
- # ifdef __LDSO_STANDALONE_SUPPORT__
- /* Do not leak */
- free(lib_path);
- # endif
- if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
- return 1;
- }
- /* If the exec failed, we fall through to trying to find
- * all the needed libraries ourselves by rummaging about
- * in the ELF headers... */
- }
- }
- #endif
- dynsec = elf_find_section_type(SHT_DYNAMIC, ehdr);
- if (dynsec) {
- dynamic = (ElfW(Dyn) *) (byteswap_to_host(dynsec->sh_offset) + (char *)ehdr);
- find_needed_libraries(ehdr, dynamic, is_suid);
- }
- return 0;
- }
- int main(int argc, char **argv)
- {
- int multi = 0;
- int got_em_all = 1;
- char *filename = NULL;
- struct library *cur;
- if (argc < 2) {
- fprintf(stderr, "ldd: missing file arguments\n"
- "Try `ldd --help' for more information.\n");
- exit(EXIT_FAILURE);
- }
- if (argc > 2)
- multi++;
- while (--argc > 0) {
- ++argv;
- if (strcmp(*argv, "--") == 0) {
- /* Ignore "--" */
- continue;
- }
- if (strcmp(*argv, "--help") == 0 || strcmp(*argv, "-h") == 0) {
- fprintf(stderr, "Usage: ldd [OPTION]... FILE...\n"
- "\t--help\t\tprint this help and exit\n");
- exit(EXIT_SUCCESS);
- }
- filename = *argv;
- if (!filename) {
- fprintf(stderr, "No filename specified.\n");
- exit(EXIT_FAILURE);
- }
- if (multi) {
- printf("%s:\n", *argv);
- }
- map_cache();
- if (find_dependencies(filename) != 0)
- continue;
- while (got_em_all) {
- got_em_all = 0;
- /* Keep walking the list till everybody is resolved */
- for (cur = lib_list; cur; cur = cur->next) {
- if (cur->resolved == 0 && cur->path) {
- got_em_all = 1;
- printf("checking sub-depends for '%s'\n", cur->path);
- find_dependencies(cur->path);
- cur->resolved = 1;
- }
- }
- }
- unmap_cache();
- /* Print the list */
- got_em_all = 0;
- for (cur = lib_list; cur; cur = cur->next) {
- got_em_all = 1;
- printf("\t%s => %s (0x00000000)\n", cur->name, cur->path);
- }
- if (interp_name && interpreter_already_found == 1)
- printf("\t%s => %s (0x00000000)\n", interp_name, interp_name);
- else
- printf("\tnot a dynamic executable\n");
- for (cur = lib_list; cur; cur = cur->next) {
- free(cur->name);
- cur->name = NULL;
- if (cur->path && cur->path != not_found) {
- free(cur->path);
- cur->path = NULL;
- }
- }
- lib_list = NULL;
- }
- return 0;
- }
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