diff options
Diffstat (limited to 'elf/dl-load.c')
| -rw-r--r-- | elf/dl-load.c | 295 |
1 files changed, 114 insertions, 181 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c index 212b22307a..7d3ff0cc22 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -100,6 +100,11 @@ extern size_t _dl_platformlen; binaries. */ static struct r_search_path_elem **fake_path_list; +/* List of the hardware capabilities we might end up using. */ +static const struct r_strlenpair *capstr; +static size_t ncapstr; +static size_t max_capstrlen; + /* Local version of `strdup' function. */ static inline char * @@ -119,6 +124,7 @@ local_strdup (const char *s) be freed if the shared object already has this name. Returns false if the object already had this name. */ static int +internal_function add_name_to_object (struct link_map *l, char *name) { struct libname_list *lnp, *lastp; @@ -156,9 +162,11 @@ add_name_to_object (struct link_map *l, char *name) return 1; } +/* All known directories in sorted order. */ +static struct r_search_path_elem *all_dirs; -/* Implement cache for search path lookup. */ -#include "rtldtbl.h" +/* Standard search directories. */ +static struct r_search_path_elem **rtld_search_dirs; static size_t max_dirnamelen; @@ -173,6 +181,11 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, { struct r_search_path_elem *dirp; size_t len = strlen (cp); + + /* `strsep' can pass an empty string. */ + if (len == 0) + continue; + /* Remove trailing slashes. */ while (len > 1 && cp[len - 1] == '/') --len; @@ -187,7 +200,8 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, continue; while (*trun != NULL - && (memcmp (*trun, cp, len) != 0 || (*trun)[len] != '\0')) + && (memcmp (*trun, cp, len) != 0 + || ((*trun)[len] != '/' && (*trun)[len + 1] != '\0'))) ++trun; if (*trun == NULL) @@ -201,12 +215,12 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, /* See if this directory is already known. */ for (dirp = all_dirs; dirp != NULL; dirp = dirp->next) - if (dirp->dirnamelen == len && strcmp (cp, dirp->dirname) == 0) + if (dirp->dirnamelen == len && memcmp (cp, dirp->dirname, len) == 0) break; if (dirp != NULL) { - /* It is available, see whether it's in our own list. */ + /* It is available, see whether it's on our own list. */ size_t cnt; for (cnt = 0; cnt < nelems; ++cnt) if (result[cnt] == dirp) @@ -217,57 +231,30 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, } else { + size_t cnt; + /* It's a new directory. Create an entry and add it. */ - dirp = (struct r_search_path_elem *) malloc (sizeof (*dirp)); + dirp = (struct r_search_path_elem *) + malloc (sizeof (*dirp) + ncapstr * sizeof (enum r_dir_status)); if (dirp == NULL) _dl_signal_error (ENOMEM, NULL, "cannot create cache for search path"); + dirp->dirname = cp; dirp->dirnamelen = len; + + if (len > max_dirnamelen) + max_dirnamelen = len; + /* We have to make sure all the relative directories are never ignored. The current directory might change and all our saved information would be void. */ - dirp->dirstatus = cp[0] != '/' ? existing : unknown; - - /* Add the name of the machine dependent directory if a machine - is defined. */ - if (_dl_platform != NULL) - { - char *tmp; - - dirp->machdirnamelen = len + _dl_platformlen + 1; - tmp = (char *) malloc (len + _dl_platformlen + 2); - if (tmp == NULL) - _dl_signal_error (ENOMEM, NULL, - "cannot create cache for search path"); - dirp->dirname = tmp; - tmp = __mempcpy (tmp, cp, len); - tmp = __mempcpy (tmp, _dl_platform, _dl_platformlen); - *tmp++ = '/'; - *tmp = '\0'; - - dirp->machdirstatus = dirp->dirstatus; - - if (max_dirnamelen < dirp->machdirnamelen) - max_dirnamelen = dirp->machdirnamelen; - } + if (cp[0] != '/') + for (cnt = 0; cnt < ncapstr; ++cnt) + dirp->status[cnt] = existing; else - { - char *tmp; - - dirp->machdirnamelen = len; - dirp->machdirstatus = nonexisting; - - tmp = (char *) malloc (len + 1); - if (tmp == NULL) - _dl_signal_error (ENOMEM, NULL, - "cannot create cache for search path"); - dirp->dirname = tmp; - *((char *) __mempcpy (tmp, cp, len)) = '\0'; - - if (max_dirnamelen < dirp->dirnamelen) - max_dirnamelen = dirp->dirnamelen; - } + for (cnt = 0; cnt < ncapstr; ++cnt) + dirp->status[cnt] = unknown; dirp->what = what; dirp->where = where; @@ -288,6 +275,7 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, static struct r_search_path_elem ** +internal_function decompose_rpath (const char *rpath, size_t additional_room, const char *what, const char *where) { @@ -317,13 +305,14 @@ decompose_rpath (const char *rpath, size_t additional_room, void _dl_init_paths (const char *llp) { - static const char *trusted_dirs[] = + static const char *system_dirs[] = { #include "trusted-dirs.h" NULL }; - - struct r_search_path_elem **pelem; + const char **strp; + struct r_search_path_elem *pelem, **aelem; + size_t round_size; /* We have in `search_path' the information about the RPATH of the dynamic loader. Now fill in the information about the applications @@ -331,10 +320,6 @@ _dl_init_paths (const char *llp) variable. */ struct link_map *l; - /* Names of important hardware capabilities. */ - char **hwcap_names; - size_t nhwcap_names; - /* Number of elements in the library path. */ size_t nllp; @@ -352,8 +337,47 @@ _dl_init_paths (const char *llp) nllp = 0; /* Get the capabilities. */ - hwcap_names = _dl_important_hwcaps (&nhwcap_names, - _dl_platform, _dl_platformlen); + capstr = _dl_important_hwcaps (_dl_platform, _dl_platformlen, + &ncapstr, &max_capstrlen); + + /* First set up the rest of the default search directory entries. */ + aelem = rtld_search_dirs = (struct r_search_path_elem **) + malloc ((ncapstr + 1) * sizeof (struct r_search_path_elem *)); + + round_size = ((2 * sizeof (struct r_search_path_elem) - 1 + + ncapstr * sizeof (enum r_dir_status)) + / sizeof (struct r_search_path_elem)); + + rtld_search_dirs[0] = (struct r_search_path_elem *) + malloc ((sizeof (system_dirs) / sizeof (system_dirs[0]) - 1) + * round_size * sizeof (struct r_search_path_elem)); + if (rtld_search_dirs[0] == NULL) + _dl_signal_error (ENOMEM, NULL, "cannot create cache for search path"); + + pelem = all_dirs= rtld_search_dirs[0]; + for (strp = system_dirs; *strp != NULL; ++strp, pelem += round_size) + { + size_t cnt; + + *aelem++ = pelem; + + pelem->next = *(strp + 1) == NULL ? NULL : (pelem + round_size); + + pelem->what = "system search path"; + pelem->where = NULL; + + pelem->dirnamelen = strlen (pelem->dirname = *strp); + if (pelem->dirnamelen > max_dirnamelen) + max_dirnamelen = pelem->dirnamelen; + + if (pelem->dirname[0] != '/') + for (cnt = 0; cnt < ncapstr; ++cnt) + pelem->status[cnt] = existing; + else + for (cnt = 0; cnt < ncapstr; ++cnt) + pelem->status[cnt] = unknown; + } + *aelem = NULL; l = _dl_loaded; if (l != NULL) @@ -391,7 +415,7 @@ _dl_init_paths (const char *llp) if (nllp > 0) { - char *copy = strdupa (llp); + char *copy = local_strdup (llp); /* Decompose the LD_LIBRARY_PATH and fill in the result. First search for the next place to enter elements. */ @@ -402,7 +426,7 @@ _dl_init_paths (const char *llp) /* We need to take care that the LD_LIBRARY_PATH environment variable can contain a semicolon. */ (void) fillin_rpath (copy, result, ":;", - __libc_enable_secure ? trusted_dirs : NULL, + __libc_enable_secure ? system_dirs : NULL, "LD_LIBRARY_PATH", NULL); } } @@ -424,50 +448,10 @@ _dl_init_paths (const char *llp) "cannot create cache for search path"); (void) fillin_rpath (local_strdup (llp), fake_path_list, ":;", - __libc_enable_secure ? trusted_dirs : NULL, + __libc_enable_secure ? system_dirs : NULL, "LD_LIBRARY_PATH", NULL); } } - - /* Now set up the rest of the rtld_search_dirs. */ - for (pelem = rtld_search_dirs; *pelem != NULL; ++pelem) - { - struct r_search_path_elem *relem = *pelem; - - if (_dl_platform != NULL) - { - char *tmp, *orig; - - relem->machdirnamelen = relem->dirnamelen + _dl_platformlen + 1; - tmp = (char *) malloc (relem->machdirnamelen + 1); - if (tmp == NULL) - _dl_signal_error (ENOMEM, NULL, - "cannot create cache for search path"); - - orig = tmp; - tmp = __mempcpy (tmp, relem->dirname, relem->dirnamelen); - tmp = __mempcpy (tmp, _dl_platform, _dl_platformlen); - *tmp++ = '/'; - *tmp = '\0'; - relem->dirname = orig; - - relem->machdirstatus = unknown; - - if (max_dirnamelen < relem->machdirnamelen) - max_dirnamelen = relem->machdirnamelen; - } - else - { - relem->machdirnamelen = relem->dirnamelen; - relem->machdirstatus = nonexisting; - - if (max_dirnamelen < relem->dirnamelen) - max_dirnamelen = relem->dirnamelen; - } - - relem->what = "system search path"; - relem->where = NULL; - } } @@ -844,26 +828,26 @@ static void print_search_path (struct r_search_path_elem **list, const char *what, const char *name) { + char buf[max_dirnamelen + max_capstrlen]; + char *endp; int first = 1; _dl_debug_message (1, " search path=", NULL); while (*list != NULL && (*list)->what == what) /* Yes, ==. */ { - char *buf = strdupa ((*list)->dirname); + char *endp = __mempcpy (buf, (*list)->dirname, (*list)->dirnamelen); + size_t cnt; + + for (cnt = 0; cnt < ncapstr; ++cnt) + if ((*list)->status[cnt] != nonexisting) + { + char *cp = __mempcpy (endp, capstr[cnt].str, capstr[cnt].len); + cp[-1] = '\0'; + _dl_debug_message (0, first ? "" : ":", buf, NULL); + first = 0; + } - if ((*list)->machdirstatus != nonexisting) - { - buf[(*list)->machdirnamelen - 1] = '\0'; - _dl_debug_message (0, first ? "" : ":", buf, NULL); - first = 0; - } - if ((*list)->dirstatus != nonexisting) - { - buf[(*list)->dirnamelen - 1] = '\0'; - _dl_debug_message (0, first ? "" : ":", buf, NULL); - first = 0; - } ++list; } @@ -893,11 +877,12 @@ open_path (const char *name, size_t namelen, int preloaded, return -1; } - buf = __alloca (max_dirnamelen + namelen); + buf = __alloca (max_dirnamelen + max_capstrlen + namelen + 1); do { struct r_search_path_elem *this_dir = *dirs; size_t buflen = 0; + size_t cnt; /* If we are debugging the search for libraries print the path now if it hasn't happened now. */ @@ -907,95 +892,43 @@ open_path (const char *name, size_t namelen, int preloaded, print_search_path (dirs, current_what, this_dir->where); } - if (this_dir->machdirstatus != nonexisting) + for (cnt = 0; fd == -1 && cnt < ncapstr; ++cnt) { - /* Construct the pathname to try. */ - buflen = ((char *) __mempcpy (__mempcpy (buf, this_dir->dirname, - this_dir->machdirnamelen), - name, namelen) - - buf); + /* Skip this directory if we know it does not exist. */ + if (this_dir->status[cnt] == nonexisting) + continue; - /* Print name we try if this is wanted. */ + buflen = + ((char *) __mempcpy (__mempcpy (__mempcpy (buf, this_dir->dirname, + this_dir->dirnamelen), + capstr[cnt].str, capstr[cnt].len), + name, namelen) + - buf); + + /* Print name we try if this is wanted. */ if (_dl_debug_libs) _dl_debug_message (1, " trying file=", buf, "\n", NULL); fd = __open (buf, O_RDONLY); - if (this_dir->machdirstatus == unknown) + if (this_dir->status[cnt] == unknown) if (fd != -1) - this_dir->machdirstatus = existing; + this_dir->status[cnt] = existing; else { /* We failed to open machine dependent library. Let's test whether there is any directory at all. */ struct stat st; - buf[this_dir->machdirnamelen - 1] = '\0'; + buf[this_dir->dirnamelen + capstr[cnt].len] = '\0'; if (__xstat (_STAT_VER, buf, &st) != 0 || ! S_ISDIR (st.st_mode)) /* The directory does not exist ot it is no directory. */ - this_dir->machdirstatus = nonexisting; + this_dir->status[cnt] = nonexisting; else - this_dir->machdirstatus = existing; + this_dir->status[cnt] = existing; } - if (fd != -1 && preloaded && __libc_enable_secure) - { - /* This is an extra security effort to make sure nobody can - preload broken shared objects which are in the trusted - directories and so exploit the bugs. */ - struct stat st; - - if (__fxstat (_STAT_VER, fd, &st) != 0 - || (st.st_mode & S_ISUID) == 0) - { - /* The shared object cannot be tested for being SUID - or this bit is not set. In this case we must not - use this object. */ - __close (fd); - fd = -1; - /* We simply ignore the file, signal this by setting - the error value which would have been set by `open'. */ - errno = ENOENT; - } - } - } - else - errno = ENOENT; - if (fd == -1 && errno == ENOENT && this_dir->dirstatus != nonexisting) - { - /* Construct the pathname to try. */ - buflen = ((char *) __mempcpy (__mempcpy (buf, this_dir->dirname, - this_dir->dirnamelen), - name, namelen) - - buf); - - /* Print name we try if this is wanted. */ - if (_dl_debug_libs) - _dl_debug_message (1, " trying file=", buf, "\n", NULL); - - fd = __open (buf, O_RDONLY); - if (this_dir->dirstatus == unknown) - if (fd != -1) - this_dir->dirstatus = existing; - else - /* We failed to open library. Let's test whether there - is any directory at all. */ - if (this_dir->dirnamelen <= 1) - this_dir->dirstatus = existing; - else - { - struct stat st; - - buf[this_dir->dirnamelen - 1] = '\0'; - - if (__xstat (_STAT_VER, buf, &st) != 0 - || ! S_ISDIR (st.st_mode)) - /* The directory does not exist ot it is no directory. */ - this_dir->dirstatus = nonexisting; - else - this_dir->dirstatus = existing; - } if (fd != -1 && preloaded && __libc_enable_secure) { /* This is an extra security effort to make sure nobody can |