/*
* A small little ldd implementation for uClibc
*
- * Copyright (C) 2000-2004 Erik Andersen <andersee@debian.org>
+ * 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
* <jreiser@BitWagon.com>, which is copyright 2000 BitWagon Software LLC
* (GPL2).
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2 or later
*/
+#include "porting.h"
-#define _GNU_SOURCE
-#include <stdlib.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-#include "bswap.h"
-#if defined (sun)
-#include "link.h"
-#else
-#include "elf.h"
+#if defined(__alpha__)
+#define MATCH_MACHINE(x) (x == EM_ALPHA)
+#define ELFCLASSM ELFCLASS64
#endif
-#ifdef DMALLOC
-#include <dmalloc.h>
+#if defined(__arc__)
+#define MATCH_MACHINE(x) (x == EM_ARCOMPACT)
+#define ELFCLASSM ELFCLASS32
#endif
-#if defined(__arm__)
+#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(__s390__)
#define MATCH_MACHINE(x) (x == EM_S390)
#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)
#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(__mips__)
#define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE)
#define ELFCLASSM ELFCLASS32
#endif
-#if defined(__powerpc__)
+#if defined(__powerpc64__)
+#define MATCH_MACHINE(x) (x == EM_PPC64)
+#define ELFCLASSM ELFCLASS64
+#elif defined(__powerpc__)
#define MATCH_MACHINE(x) (x == EM_PPC)
#define ELFCLASSM ELFCLASS32
#endif
#define ELFCLASSM ELFCLASS32
#endif
-#if defined (__v850e__)
+#if defined(__v850e__)
#define MATCH_MACHINE(x) ((x) == EM_V850 || (x) == EM_CYGNUS_V850)
#define ELFCLASSM ELFCLASS32
#endif
-#if defined (__sparc__)
+#if defined(__sparc__)
#define MATCH_MACHINE(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
#define ELFCLASSM ELFCLASS32
#endif
#define ELFCLASSM ELFCLASS32
#endif
+#if defined(__x86_64__)
+#define MATCH_MACHINE(x) (x == EM_X86_64)
+#define ELFCLASSM ELFCLASS64
+#endif
+
+#if defined(__microblaze__)
+#define MATCH_MACHINE(x) (x == EM_MICROBLAZE_OLD)
+#define ELFCLASSM ELFCLASS32
+#endif
+
+#if defined(__xtensa__)
+#define MATCH_MACHINE(x) (x == EM_XTENSA)
+#define ELFCLASSM ELFCLASS32
+#endif
+
#ifndef MATCH_MACHINE
-#warning "You really should add a MATCH_MACHINE() macro for your architecture"
+# 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 __BYTE_ORDER == __LITTLE_ENDIAN
+#if UCLIBC_ENDIAN_HOST == UCLIBC_ENDIAN_LITTLE
#define ELFDATAM ELFDATA2LSB
-#elif __BYTE_ORDER == __BIG_ENDIAN
+#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;
};
-struct library *lib_list = NULL;
-char not_found[] = "not found";
-char *interp = NULL;
-char *interp_dir = NULL;
-int byteswap;
-static int interpreter_already_found=0;
-
-inline uint32_t byteswap32_to_host(uint32_t value)
+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==1) {
- return(bswap_32(value));
+ if (byteswap) {
+ return (bswap_64(value));
} else {
- return(value);
+ return (value);
}
}
-Elf32_Shdr * elf_find_section_type( int key, Elf32_Ehdr *ehdr)
+#if ELFCLASSM == ELFCLASS32
+# define byteswap_to_host(x) byteswap32_to_host(x)
+#else
+# define byteswap_to_host(x) byteswap64_to_host(x)
+#endif
+
+static ElfW(Shdr) *elf_find_section_type(uint32_t key, ElfW(Ehdr) *ehdr)
{
int j;
- Elf32_Shdr *shdr;
- shdr = (Elf32_Shdr *)(ehdr->e_shoff + (char *)ehdr);
- for (j = ehdr->e_shnum; --j>=0; ++shdr) {
- if (key==(int)byteswap32_to_host(shdr->sh_type)) {
+ 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;
}
-Elf32_Phdr * elf_find_phdr_type( int type, Elf32_Ehdr *ehdr)
+static ElfW(Phdr) *elf_find_phdr_type(uint32_t type, ElfW(Ehdr) *ehdr)
{
int j;
- Elf32_Phdr *phdr = (Elf32_Phdr *)(ehdr->e_phoff + (char *)ehdr);
- for (j = ehdr->e_phnum; --j>=0; ++phdr) {
- if (type==(int)byteswap32_to_host(phdr->p_type)) {
+ 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;
}
}
}
/* Returns value if return_val==1, ptr otherwise */
-void * elf_find_dynamic(int const key, Elf32_Dyn *dynp,
- Elf32_Ehdr *ehdr, int return_val)
+static void *elf_find_dynamic(int64_t const key, ElfW(Dyn) *dynp,
+ ElfW(Ehdr) *ehdr, int return_val)
{
- Elf32_Phdr *pt_text = elf_find_phdr_type(PT_LOAD, ehdr);
- unsigned tx_reloc = byteswap32_to_host(pt_text->p_vaddr) - byteswap32_to_host(pt_text->p_offset);
- for (; DT_NULL!=byteswap32_to_host(dynp->d_tag); ++dynp) {
- if (key == (int)byteswap32_to_host(dynp->d_tag)) {
+ 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 *)(intptr_t)byteswap32_to_host(dynp->d_un.d_val);
+ return (void *)byteswap_to_host(dynp->d_un.d_val);
else
- return (void *)(byteswap32_to_host(dynp->d_un.d_val) - tx_reloc + (char *)ehdr );
+ return (void *)(byteswap_to_host(dynp->d_un.d_val) - tx_reloc + (char *)ehdr);
}
}
return NULL;
}
-static char * elf_find_rpath(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic)
+static char *elf_find_rpath(ElfW(Ehdr) *ehdr, ElfW(Dyn) *dynamic)
{
- Elf32_Dyn *dyns;
+ ElfW(Dyn) *dyns;
- for (dyns=dynamic; byteswap32_to_host(dyns->d_tag)!=DT_NULL; ++dyns) {
- if (DT_RPATH == byteswap32_to_host(dyns->d_tag)) {
+ 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 + byteswap32_to_host(dyns->d_un.d_val));
+ return ((char *)strtab + byteswap_to_host(dyns->d_un.d_val));
}
}
return NULL;
}
-int check_elf_header(Elf32_Ehdr *const ehdr)
+static int check_elf_header(ElfW(Ehdr) *const ehdr)
{
- if (! ehdr || strncmp((void *)ehdr, ELFMAG, SELFMAG) != 0 ||
- ehdr->e_ident[EI_CLASS] != ELFCLASS32 ||
- ehdr->e_ident[EI_VERSION] != EV_CURRENT)
- {
+ if (!ehdr || *(uint32_t*)ehdr != ELFMAG_U32
+ || ehdr->e_ident[EI_CLASS] != ELFCLASSM
+ || ehdr->e_ident[EI_VERSION] != EV_CURRENT
+ ) {
return 1;
}
/* Check if the target endianness matches the host's endianness */
- byteswap = 0;
-#if __BYTE_ORDER == __LITTLE_ENDIAN
- if (ehdr->e_ident[5] == ELFDATA2MSB) {
- /* Ick -- we will have to byte-swap everything */
- byteswap = 1;
+ 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);
}
-#elif __BYTE_ORDER == __BIG_ENDIAN
- if (ehdr->e_ident[5] == ELFDATA2LSB) {
- /* Ick -- we will have to byte-swap everything */
- byteswap = 1;
+
+ 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;
}
-#else
-#error Unknown host byte order!
-#endif
- /* Be vary lazy, and only byteswap the stuff we use */
- if (byteswap==1) {
- ehdr->e_type=bswap_16(ehdr->e_type);
- ehdr->e_phoff=bswap_32(ehdr->e_phoff);
- ehdr->e_shoff=bswap_32(ehdr->e_shoff);
- ehdr->e_phnum=bswap_16(ehdr->e_phnum);
- ehdr->e_shnum=bswap_16(ehdr->e_shnum);
+ 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)
+static void search_for_named_library(char *name, char *result,
+ const char *path_list)
{
int i, count = 1;
char *path, *path_n;
/* We need a writable copy of this string */
path = strdup(path_list);
if (!path) {
- fprintf(stderr, "Out of memory!\n");
+ fprintf(stderr, "%s: Out of memory!\n", __func__);
exit(EXIT_FAILURE);
}
/* Eliminate all double //s */
- path_n=path;
- while((path_n=strstr(path_n, "//"))) {
+ 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';
+ 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;
+ for (i = strlen(path); i > 0; i--) {
+ if (path[i] == ':') {
+ path[i] = 0;
count++;
}
}
strcpy(result, path_n);
strcat(result, "/");
strcat(result, name);
- if (stat (result, &filestat) == 0 && filestat.st_mode & S_IRUSR) {
+ if (stat(result, &filestat) == 0 && filestat.st_mode & S_IRUSR) {
free(path);
return;
}
*result = '\0';
}
-void locate_library_file(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, int is_suid, struct library *lib)
+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) {
+ if (stat(lib->name, &filestat) == 0) {
lib->path = strdup(lib->name);
return;
}
- /* We need some elbow room here. Make some room...*/
+ /* We need some elbow room here. Make some room... */
buf = malloc(1024);
if (!buf) {
- fprintf(stderr, "Out of memory!\n");
+ fprintf(stderr, "%s: Out of memory!\n", __func__);
exit(EXIT_FAILURE);
}
/* 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)
+ if (is_suid == 1)
path = NULL;
else
path = getenv("LD_LIBRARY_PATH");
return;
}
}
-
-#ifdef USE_CACHE
- /* FIXME -- add code to check the Cache here */
+#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... */
/* 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";
+ 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;
}
}
-static int add_library(Elf32_Ehdr* ehdr, Elf32_Dyn* dynamic, int is_setuid, char *s)
+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;
+ struct library *cur, *newlib = lib_list;
if (!s || !strlen(s))
return 1;
}
/* We add ldso elsewhere */
- if (interpreter_already_found && (tmp=strrchr(interp, '/')) != NULL)
- {
+ if (interpreter_already_found && (tmp = strrchr(interp_name, '/')) != NULL) {
int len = strlen(interp_dir);
- if (strcmp(s, interp+1+len)==0)
+ if (strcmp(s, interp_name + 1 + len) == 0)
return 1;
}
- for (cur = lib_list; cur; cur=cur->next) {
+ for (cur = lib_list; cur; cur = cur->next) {
/* Check if this library is already in the list */
tmp1 = tmp2 = cur->name;
while (*tmp1) {
tmp2 = tmp1 + 1;
tmp1++;
}
- if(strcmp(tmp2, s)==0) {
- //printf("find_elf_interpreter is skipping '%s' (already in list)\n", cur->name);
+ if (strcmp(tmp2, s) == 0) {
+ /*printf("find_elf_interpreter is skipping '%s' (already in list)\n", cur->name); */
return 0;
}
}
newlib = malloc(sizeof(struct library));
if (!newlib)
return 1;
- newlib->name = malloc(strlen(s)+1);
+ newlib->name = malloc(strlen(s) + 1);
strcpy(newlib->name, s);
newlib->resolved = 0;
newlib->path = 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);
+ /*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 */
+ for (cur = lib_list; cur->next; cur = cur->next) ; /* nothing */
cur->next = newlib;
}
return 0;
}
-static void find_needed_libraries(Elf32_Ehdr* ehdr,
- Elf32_Dyn* dynamic, int is_setuid)
+static void find_needed_libraries(ElfW(Ehdr) *ehdr, ElfW(Dyn) *dynamic, int is_setuid)
{
- Elf32_Dyn *dyns;
+ ElfW(Dyn) *dyns;
- for (dyns=dynamic; byteswap32_to_host(dyns->d_tag)!=DT_NULL; ++dyns) {
- if (DT_NEEDED == byteswap32_to_host(dyns->d_tag)) {
+ 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 + byteswap32_to_host(dyns->d_un.d_val));
+ add_library(ehdr, dynamic, is_setuid, (char *)strtab + byteswap_to_host(dyns->d_un.d_val));
}
}
}
-static struct library * find_elf_interpreter(Elf32_Ehdr* ehdr)
+#ifdef __LDSO_LDD_SUPPORT__
+static struct library *find_elf_interpreter(ElfW(Ehdr) *ehdr)
{
- Elf32_Phdr *phdr;
+ ElfW(Phdr) *phdr;
- if (interpreter_already_found==1)
+ 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 + byteswap32_to_host(phdr->p_offset);
+ struct library *cur, *newlib = NULL;
+ char *s = (char *)ehdr + byteswap_to_host(phdr->p_offset);
char *tmp, *tmp1;
- interp = strdup(s);
+ interp_name = strdup(s);
interp_dir = strdup(s);
tmp = strrchr(interp_dir, '/');
- if (*tmp)
+ if (tmp)
*tmp = '\0';
else {
free(interp_dir);
- interp_dir = interp;
+ interp_dir = interp_name;
}
tmp1 = tmp = s;
while (*tmp) {
tmp1 = tmp + 1;
tmp++;
}
- for (cur = lib_list; cur; cur=cur->next) {
+ for (cur = lib_list; cur; cur = cur->next) {
/* Check if this library is already in the list */
- if(strcmp(cur->name, tmp1)==0) {
- //printf("find_elf_interpreter is replacing '%s' (already in list)\n", cur->name);
+ 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) {
}
newlib->name = NULL;
newlib->path = NULL;
- return NULL;
+ break;
}
}
if (newlib == NULL)
newlib = malloc(sizeof(struct library));
if (!newlib)
return NULL;
- newlib->name = malloc(strlen(s)+1);
+ 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);
+ /*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 */
+ for (cur = lib_list; cur->next; cur = cur->next) ; /* nothing */
cur->next = newlib;
}
#endif
- interpreter_already_found=1;
+ interpreter_already_found = 1;
return newlib;
}
return NULL;
}
+#endif /* __LDSO_LDD_SUPPORT__ */
/* map the .so, and locate interesting pieces */
-int find_dependancies(char* filename)
+/*
+#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;
- Elf32_Ehdr *ehdr = NULL;
- Elf32_Shdr *dynsec = NULL;
- Elf32_Dyn *dynamic = NULL;
+ 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;
return -1;
}
- if ((size_t)statbuf.st_size < sizeof(Elf32_Ehdr))
+ 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 = (Elf32_Ehdr *)mmap(0, statbuf.st_size,
- PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(thefile), 0);
+ ehdr = mmap(0, statbuf.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fileno(thefile), 0);
if (ehdr == MAP_FAILED) {
fclose(thefile);
- fprintf(stderr, "Out of memory!\n");
+ fprintf(stderr, "mmap(%s) failed: %s\n", filename, strerror(errno));
return -1;
}
fprintf(stderr, "%s: not a dynamic executable\n", filename);
return -1;
}
- if (ehdr->e_type == ET_EXEC || ehdr->e_type != ET_DYN) {
+ 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))
fprintf(stderr, "%s: is setuid\n", filename);
}
- interpreter_already_found=0;
+ interpreter_already_found = 0;
+#ifdef __LDSO_LDD_SUPPORT__
interp = find_elf_interpreter(ehdr);
-#ifdef __LDSO_LDD_SUPPORT
- 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))
+ 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 statbuf;
- if (stat(interp->path, &statbuf) == 0 && S_ISREG(statbuf.st_mode)) {
+ struct stat st;
+ if (stat(interp->path, &st) == 0 && S_ISREG(st.st_mode)) {
pid_t pid;
int status;
- static const char * const environment[] = {
+ static const char *const environment[] = {
"PATH=/usr/bin:/bin:/usr/sbin:/sbin",
"SHELL=/bin/sh",
"LD_TRACE_LOADED_OBJECTS=1",
NULL
};
-
- if ((pid = fork()) == 0) {
+# 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);
- if (WIFEXITED(status) && WEXITSTATUS(status)==0) {
+
+# ifdef __LDSO_STANDALONE_SUPPORT__
+ /* Do not leak */
+ free(lib_path);
+# endif
+
+ if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
return 1;
}
dynsec = elf_find_section_type(SHT_DYNAMIC, ehdr);
if (dynsec) {
- dynamic = (Elf32_Dyn*)(byteswap32_to_host(dynsec->sh_offset) + (intptr_t)ehdr);
+ 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 main(int argc, char **argv)
{
- int multi=0;
- int got_em_all=1;
+ int multi = 0;
+ int got_em_all = 1;
char *filename = NULL;
struct library *cur;
if (argc < 2) {
- fprintf(stderr, "ldd: missing file arguments\n");
- fprintf(stderr, "Try `ldd --help' for more information.\n");
+ fprintf(stderr, "ldd: missing file arguments\n"
+ "Try `ldd --help' for more information.\n");
exit(EXIT_FAILURE);
}
- if (argc > 2) {
+ if (argc > 2)
multi++;
- }
while (--argc > 0) {
++argv;
- if(strcmp(*argv, "--")==0) {
+ if (strcmp(*argv, "--") == 0) {
/* Ignore "--" */
continue;
}
- if(strcmp(*argv, "--help")==0) {
- fprintf(stderr, "Usage: ldd [OPTION]... FILE...\n");
- fprintf(stderr, "\t--help\t\tprint this help and exit\n");
- exit(EXIT_FAILURE);
+ 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;
+ filename = *argv;
if (!filename) {
fprintf(stderr, "No filename specified.\n");
exit(EXIT_FAILURE);
printf("%s:\n", *argv);
}
- if (find_dependancies(filename)!=0)
+ map_cache();
+
+ if (find_dependencies(filename) != 0)
continue;
- while(got_em_all) {
- got_em_all=0;
+ while (got_em_all) {
+ got_em_all = 0;
/* Keep walking the list till everybody is resolved */
- for (cur = lib_list; cur; cur=cur->next) {
+ 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_dependancies(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;
+ 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 && interpreter_already_found==1)
- printf("\t%s => %s (0x00000000)\n", interp, interp);
+ 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) {
+ for (cur = lib_list; cur; cur = cur->next) {
free(cur->name);
- cur->name=NULL;
+ cur->name = NULL;
if (cur->path && cur->path != not_found) {
free(cur->path);
- cur->path=NULL;
+ cur->path = NULL;
}
}
- lib_list=NULL;
+ lib_list = NULL;
}
return 0;
}
-
OSDN Git Service
