diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/dl-load.c | 90 |
1 files changed, 48 insertions, 42 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c index ad29386..21c3274 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -126,6 +126,8 @@ static const size_t system_dirs_len[] = { SYSTEM_DIRS_LEN }; +#define nsystem_dirs_len \ + (sizeof (system_dirs_len) / sizeof (system_dirs_len[0])) /* Local version of `strdup' function. */ @@ -362,32 +364,6 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, if (len > 0 && cp[len - 1] != '/') cp[len++] = '/'; - /* Make sure we don't use untrusted directories if we run SUID. */ - if (check_trusted) - { - const char *trun = system_dirs; - size_t idx; - - /* All trusted directories must be complete names. */ - if (cp[0] != '/') - continue; - - for (idx = 0; - idx < sizeof (system_dirs_len) / sizeof (system_dirs_len[0]); - ++idx) - { - if (len == system_dirs_len[idx] && memcmp (trun, cp, len) == 0) - /* Found it. */ - break; - - trun += system_dirs_len[idx] + 1; - } - - if (idx == sizeof (system_dirs_len) / sizeof (system_dirs_len[0])) - /* It's no trusted directory, skip it. */ - continue; - } - /* See if this directory is already known. */ for (dirp = all_dirs; dirp != NULL; dirp = dirp->next) if (dirp->dirnamelen == len && memcmp (cp, dirp->dirname, len) == 0) @@ -408,7 +384,7 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, { size_t cnt; enum r_dir_status init_val; - size_t where_len = strlen (where) + 1; + size_t where_len = where ? strlen (where) + 1 : 0; /* It's a new directory. Create an entry and add it. */ dirp = (struct r_search_path_elem *) @@ -424,17 +400,51 @@ fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep, 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. */ - init_val = cp[0] != '/' ? existing : unknown; + /* Make sure we don't use untrusted directories if we run SUID. */ + if (__builtin_expect (check_trusted, 0)) + { + const char *trun = system_dirs; + size_t idx; + + /* By default we don't trust anything. */ + init_val = nonexisting; + + /* All trusted directories must be complete names. */ + if (cp[0] == '/') + { + for (idx = 0; idx < nsystem_dirs_len; ++idx) + { + if (len == system_dirs_len[idx] + && memcmp (trun, cp, len) == 0) + /* Found it. */ + break; + + trun += system_dirs_len[idx] + 1; + } + + if (idx < nsystem_dirs_len) + /* It's a trusted directory so allow checking for it. */ + init_val = unknown; + } + } + else + /* We don't have to check for trusted directories and can + accept everything. 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. */ + init_val = cp[0] != '/' ? existing : unknown; + for (cnt = 0; cnt < ncapstr; ++cnt) dirp->status[cnt] = init_val; dirp->what = what; - dirp->where = memcpy ((char *) dirp + sizeof (*dirp) - + ncapstr * sizeof (enum r_dir_status), - where, where_len); + if (__builtin_expect (where != NULL, 1)) + dirp->where = memcpy ((char *) dirp + sizeof (*dirp) + + ncapstr * sizeof (enum r_dir_status), + where, where_len); + else + dirp->where = NULL; dirp->next = all_dirs; all_dirs = dirp; @@ -531,8 +541,7 @@ _dl_init_paths (const char *llp) /* First set up the rest of the default search directory entries. */ aelem = rtld_search_dirs = (struct r_search_path_elem **) - malloc ((sizeof (system_dirs_len) / sizeof (system_dirs_len[0]) + 1) - * sizeof (struct r_search_path_elem *)); + malloc ((nsystem_dirs_len + 1) * sizeof (struct r_search_path_elem *)); if (rtld_search_dirs == NULL) _dl_signal_error (ENOMEM, NULL, N_("cannot create search path array")); @@ -570,13 +579,11 @@ _dl_init_paths (const char *llp) for (cnt = 0; cnt < ncapstr; ++cnt) pelem->status[cnt] = unknown; - pelem->next = (++idx == (sizeof (system_dirs_len) - / sizeof (system_dirs_len[0])) - ? NULL : (pelem + round_size)); + pelem->next = (++idx == nsystem_dirs_len ? NULL : (pelem + round_size)); pelem += round_size; } - while (idx < sizeof (system_dirs_len) / sizeof (system_dirs_len[0])); + while (idx < nsystem_dirs_len); max_dirnamelen = SYSTEM_DIRS_MAX_LEN; *aelem = NULL; @@ -1506,8 +1513,7 @@ _dl_map_object (struct link_map *loader, const char *name, int preloaded, dirp += system_dirs_len[cnt] + 1; ++cnt; } - while (cnt < (sizeof (system_dirs_len) - / sizeof (system_dirs_len[0]))); + while (cnt < nsystem_dirs_len); } if (cached) |