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-rw-r--r--utils/ldconfig.c143
1 files changed, 112 insertions, 31 deletions
diff --git a/utils/ldconfig.c b/utils/ldconfig.c
index 202a58dd6..85ce015d5 100644
--- a/utils/ldconfig.c
+++ b/utils/ldconfig.c
@@ -22,6 +22,8 @@
*
* This program may be used for any purpose as long as this
* copyright notice is kept.
+ *
+ * 2005/09/16: Dan Howell (modified for cross-development)
*/
#include <stdio.h>
@@ -37,6 +39,7 @@
#include <errno.h>
#include <sys/stat.h>
#include <sys/mman.h>
+#include "bswap.h"
#include "dl-defs.h"
#define BUFFER_SIZE 4096
@@ -56,6 +59,7 @@ struct exec
#if !defined (N_MAGIC)
#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#endif
+#define N_MAGIC_SWAP(exec) (bswap_32((exec).a_info) & 0xffff)
/* Code indicating object file or impure executable. */
#define OMAGIC 0407
/* Code indicating pure executable. */
@@ -97,6 +101,8 @@ void cache_dolib(const char *dir, const char *so, int libtype);
char *conffile = LDSO_CONF; /* default conf file */
char *cachefile = LDSO_CACHE; /* default cache file */
#endif
+char *chroot_dir = NULL;
+int byteswap = 0;
struct needed_tab
{
@@ -117,6 +123,8 @@ struct needed_tab needed_tab[] = {
{ NULL, LIB_ELF }
};
+extern char *chroot_realpath(const char *chroot, const char *path, char resolved_path[]);
+
/* These two are used internally -- you shouldn't need to use them */
static void verror_msg(const char *s, va_list p)
@@ -242,6 +250,8 @@ char *is_shlib(const char *dir, const char *name, int *type,
ElfW(Ehdr) *elf_hdr;
struct stat statbuf;
char buff[BUFFER_SIZE];
+ char real[BUFFER_SIZE];
+ static int byteswapflag = -1; /* start with byte-order unknown */
/* see if name is of the form *.so* */
if (name[strlen(name)-1] != '~' && (cp = strstr(name, ".so")))
@@ -256,8 +266,12 @@ char *is_shlib(const char *dir, const char *name, int *type,
sprintf(buff, "%s%s%s", dir, (*dir && strcmp(dir, "/")) ?
"/" : "", name);
+ /* get real path in case of chroot */
+ if (!chroot_realpath(chroot_dir, buff, real))
+ warn("can't resolve %s in chroot %s", buff, chroot_dir);
+
/* first, make sure it's a regular file */
- if (lstat(buff, &statbuf))
+ if (lstat(real, &statbuf))
warn("skipping %s", buff);
else if (!S_ISREG(statbuf.st_mode) && !S_ISLNK(statbuf.st_mode))
warnx("%s is not a regular file or symlink, skipping", buff);
@@ -267,14 +281,15 @@ char *is_shlib(const char *dir, const char *name, int *type,
*islink = S_ISLNK(statbuf.st_mode);
/* then try opening it */
- if (!(file = fopen(buff, "rb")))
+ if (!(file = fopen(real, "rb")))
warn("skipping %s", buff);
else
{
/* now make sure it's a shared library */
if (fread(&exec, sizeof exec, 1, file) < 1)
warnx("can't read header from %s, skipping", buff);
- else if (N_MAGIC(exec) != ZMAGIC && N_MAGIC(exec) != QMAGIC)
+ else if (N_MAGIC(exec) != ZMAGIC && N_MAGIC(exec) != QMAGIC &&
+ N_MAGIC_SWAP(exec) != ZMAGIC && N_MAGIC_SWAP(exec) != QMAGIC)
{
elf_hdr = (ElfW(Ehdr) *) &exec;
if (elf_hdr->e_ident[0] != 0x7f ||
@@ -294,6 +309,9 @@ char *is_shlib(const char *dir, const char *name, int *type,
*type = LIB_ELF;
good = readsoname(buff, file, expected_type, type,
elf_hdr->e_ident[EI_CLASS]);
+ if (byteswapflag == -1)
+ /* byte-order detected */
+ byteswapflag = byteswap;
if (good == NULL || *islink)
{
if (good != NULL)
@@ -313,6 +331,12 @@ char *is_shlib(const char *dir, const char *name, int *type,
}
else
{
+ /* Determine byte-order */
+ byteswap = (N_MAGIC(exec) == ZMAGIC || N_MAGIC(exec) == QMAGIC) ? 0 : 1;
+ if (byteswapflag == -1)
+ /* byte-order detected */
+ byteswapflag = byteswap;
+
if (*islink)
good = xstrdup(name);
else
@@ -330,6 +354,14 @@ char *is_shlib(const char *dir, const char *name, int *type,
*type = LIB_DLL;
}
fclose(file);
+
+ if (byteswapflag >= 0 && byteswap != byteswapflag)
+ {
+ byteswapflag = -2;
+ warnx("mixed byte-order detected, using host byte-order...");
+ }
+ if (byteswapflag == -2)
+ byteswap = 0;
}
}
}
@@ -343,18 +375,24 @@ void link_shlib(const char *dir, const char *file, const char *so)
int change = 1;
char libname[BUFFER_SIZE];
char linkname[BUFFER_SIZE];
+ char reallibname[BUFFER_SIZE];
+ char reallinkname[BUFFER_SIZE];
struct stat libstat;
struct stat linkstat;
/* construct the full path names */
sprintf(libname, "%s/%s", dir, file);
sprintf(linkname, "%s/%s", dir, so);
+ if (!chroot_realpath(chroot_dir, libname, reallibname))
+ warn("can't resolve %s in chroot %s", libname, chroot_dir);
+ if (!chroot_realpath(chroot_dir, linkname, reallinkname))
+ warn("can't resolve %s in chroot %s", linkname, chroot_dir);
/* see if a link already exists */
- if (!stat(linkname, &linkstat))
+ if (!stat(reallinkname, &linkstat))
{
/* now see if it's the one we want */
- if (stat(libname, &libstat))
+ if (stat(reallibname, &libstat))
warn("can't stat %s", libname);
else if (libstat.st_dev == linkstat.st_dev &&
libstat.st_ino == linkstat.st_ino)
@@ -364,14 +402,14 @@ void link_shlib(const char *dir, const char *file, const char *so)
/* then update the link, if required */
if (change > 0 && !nolinks)
{
- if (!lstat(linkname, &linkstat))
+ if (!lstat(reallinkname, &linkstat))
{
if (!S_ISLNK(linkstat.st_mode))
{
warnx("%s is not a symlink", linkname);
change = -1;
}
- else if (remove(linkname))
+ else if (remove(reallinkname))
{
warn("can't unlink %s", linkname);
change = -1;
@@ -379,7 +417,7 @@ void link_shlib(const char *dir, const char *file, const char *so)
}
if (change > 0)
{
- if (symlink(file, linkname))
+ if (symlink(file, reallinkname))
{
warn("can't link %s to %s", linkname, file);
change = -1;
@@ -441,6 +479,7 @@ void scan_dir(const char *rawname)
char *so, *path, *path_n;
struct lib *lp, *libs = NULL;
int i, libtype, islink, expected_type = LIB_ANY;
+ char realname[BUFFER_SIZE];
/* We need a writable copy of this string */
path = strdup(rawname);
@@ -500,8 +539,12 @@ void scan_dir(const char *rawname)
if (verbose > 0)
printf("%s:\n", name);
+ /* get real path in case of chroot */
+ if (!chroot_realpath(chroot_dir, name, realname))
+ warn("can't resolve %s in chroot %s", name, chroot_dir);
+
/* if we can't open it, we can't do anything */
- if ((dir = opendir(name)) == NULL)
+ if ((dir = opendir(realname)) == NULL)
{
warn("skipping %s", name);
free(path);
@@ -596,8 +639,12 @@ char *get_extpath(void)
char *res = NULL, *cp;
FILE *file;
struct stat stat;
+ char realconffile[BUFFER_SIZE];
+
+ if (!chroot_realpath(chroot_dir, conffile, realconffile))
+ return NULL;
- if ((file = fopen(conffile, "r")) != NULL)
+ if ((file = fopen(realconffile, "r")) != NULL)
{
fstat(fileno(file), &stat);
res = xmalloc(stat.st_size + 1);
@@ -678,22 +725,38 @@ void cache_write(void)
{
int cachefd;
int stroffset = 0;
+ char realcachefile[BUFFER_SIZE];
char tempfile[BUFFER_SIZE];
+ header_t swap_magic;
+ header_t *magic_ptr;
+ libentry_t swap_lib;
+ libentry_t *lib_ptr;
liblist_t *cur_lib;
if (!magic.nlibs)
return;
- sprintf(tempfile, "%s~", cachefile);
+ if (!chroot_realpath(chroot_dir, cachefile, realcachefile))
+ err(EXIT_FATAL,"can't resolve %s in chroot %s (%s)",
+ cachefile, chroot_dir, strerror(errno));
+
+ sprintf(tempfile, "%s~", realcachefile);
if (unlink(tempfile) && errno != ENOENT)
- err(EXIT_FATAL,"can't unlink %s (%s)", tempfile, strerror(errno));
+ err(EXIT_FATAL,"can't unlink %s~ (%s)", cachefile, strerror(errno));
if ((cachefd = creat(tempfile, 0644)) < 0)
- err(EXIT_FATAL,"can't create %s (%s)", tempfile, strerror(errno));
-
- if (write(cachefd, &magic, sizeof (header_t)) != sizeof (header_t))
- err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
+ err(EXIT_FATAL,"can't create %s~ (%s)", cachefile, strerror(errno));
+
+ if (byteswap) {
+ swap_magic = magic;
+ swap_magic.nlibs = bswap_32(swap_magic.nlibs);
+ magic_ptr = &swap_magic;
+ } else {
+ magic_ptr = &magic;
+ }
+ if (write(cachefd, magic_ptr, sizeof (header_t)) != sizeof (header_t))
+ err(EXIT_FATAL,"can't write %s~ (%s)", cachefile, strerror(errno));
for (cur_lib = lib_head; cur_lib != NULL; cur_lib = cur_lib->next)
{
@@ -701,29 +764,37 @@ void cache_write(void)
stroffset += strlen(cur_lib->soname) + 1;
cur_lib->liboffset = stroffset;
stroffset += strlen(cur_lib->libname) + 1;
- if (write(cachefd, cur_lib, sizeof (libentry_t)) !=
- sizeof (libentry_t))
- err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
+ if (byteswap) {
+ swap_lib.flags = bswap_32(cur_lib->flags);
+ swap_lib.sooffset = bswap_32(cur_lib->sooffset);
+ swap_lib.liboffset = bswap_32(cur_lib->liboffset);
+ lib_ptr = &swap_lib;
+ } else {
+ lib_ptr = (libentry_t *)cur_lib;
+ }
+ if (write(cachefd, lib_ptr, sizeof (libentry_t)) !=
+ sizeof (libentry_t))
+ err(EXIT_FATAL,"can't write %s~ (%s)", cachefile, strerror(errno));
}
for (cur_lib = lib_head; cur_lib != NULL; cur_lib = cur_lib->next)
{
if (write(cachefd, cur_lib->soname, strlen(cur_lib->soname) + 1)
!= strlen(cur_lib->soname) + 1)
- err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
+ err(EXIT_FATAL,"can't write %s~ (%s)", cachefile, strerror(errno));
if (write(cachefd, cur_lib->libname, strlen(cur_lib->libname) + 1)
!= strlen(cur_lib->libname) + 1)
- err(EXIT_FATAL,"can't write %s (%s)", tempfile, strerror(errno));
+ err(EXIT_FATAL,"can't write %s~ (%s)", cachefile, strerror(errno));
}
if (close(cachefd))
- err(EXIT_FATAL,"can't close %s (%s)", tempfile, strerror(errno));
+ err(EXIT_FATAL,"can't close %s~ (%s)", cachefile, strerror(errno));
if (chmod(tempfile, 0644))
- err(EXIT_FATAL,"can't chmod %s (%s)", tempfile, strerror(errno));
+ err(EXIT_FATAL,"can't chmod %s~ (%s)", cachefile, strerror(errno));
- if (rename(tempfile, cachefile))
- err(EXIT_FATAL,"can't rename %s (%s)", tempfile, strerror(errno));
+ if (rename(tempfile, realcachefile))
+ err(EXIT_FATAL,"can't rename %s~ (%s)", cachefile, strerror(errno));
}
void cache_print(void)
@@ -734,8 +805,13 @@ void cache_print(void)
char *strs;
header_t *header;
libentry_t *libent;
+ char realcachefile[BUFFER_SIZE];
+
+ if (!chroot_realpath(chroot_dir, cachefile, realcachefile))
+ err(EXIT_FATAL,"can't resolve %s in chroot %s (%s)",
+ cachefile, chroot_dir, strerror(errno));
- if (stat(cachefile, &st) || (fd = open(cachefile, O_RDONLY))<0)
+ if (stat(realcachefile, &st) || (fd = open(realcachefile, O_RDONLY))<0)
err(EXIT_FATAL,"can't read %s (%s)", cachefile, strerror(errno));
if ((c = mmap(0,st.st_size, PROT_READ, MAP_SHARED ,fd, 0)) == (caddr_t)-1)
err(EXIT_FATAL,"can't map %s (%s)", cachefile, strerror(errno));
@@ -828,7 +904,6 @@ int main(int argc, char **argv)
int nodefault = 0;
char *cp, *dir, *so;
int libtype, islink;
- char *chroot_dir = NULL;
int printcache = 0;
#ifdef __LDSO_CACHE_SUPPORT__
char *extpath;
@@ -891,10 +966,16 @@ int main(int argc, char **argv)
}
if (chroot_dir && *chroot_dir) {
- if (chroot(chroot_dir) < 0)
- err(EXIT_FATAL,"couldn't chroot to %s (%s)", chroot_dir, strerror(errno));
- if (chdir("/") < 0)
- err(EXIT_FATAL,"couldn't chdir to / (%s)", strerror(errno));
+ if (chroot(chroot_dir) < 0) {
+ if (chdir(chroot_dir) < 0)
+ err(EXIT_FATAL,"couldn't chroot to %s (%s)", chroot_dir, strerror(errno));
+ }
+ else
+ {
+ if (chdir("/") < 0)
+ err(EXIT_FATAL,"couldn't chdir to / (%s)", strerror(errno));
+ chroot_dir = NULL;
+ }
}
/* allow me to introduce myself, hi, my name is ... */
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 10:18:09 +0000