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commit 10e93d968716ab82931d593bada121c17c0a4b93
Author: Dmitry V. Levin <ldv@altlinux.org>
Date: Mon Dec 18 21:46:07 2017 +0000
elf: remove redundant __libc_enable_secure check from fillin_rpath
There are just two users of fillin_rpath: one is decompose_rpath that
sets check_trusted argument to 0, another one is _dl_init_paths that
sets check_trusted argument to __libc_enable_secure and invokes
fillin_rpath only when LD_LIBRARY_PATH is non-empty.
Starting with commit
glibc-2.25.90-512-gf6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d,
LD_LIBRARY_PATH is ignored for __libc_enable_secure executables,
so check_trusted argument of fillin_rpath is always zero.
* elf/dl-load.c (is_trusted_path): Remove.
(fillin_rpath): Remove check_trusted argument and its use,
all callers changed.
Index: glibc-2.17-c758a686/elf/dl-load.c
===================================================================
--- glibc-2.17-c758a686.orig/elf/dl-load.c
+++ glibc-2.17-c758a686/elf/dl-load.c
@@ -169,24 +169,6 @@ local_strdup (const char *s)
static bool
-is_trusted_path (const char *path, size_t len)
-{
- const char *trun = system_dirs;
-
- for (size_t idx = 0; idx < nsystem_dirs_len; ++idx)
- {
- if (len == system_dirs_len[idx] && memcmp (trun, path, len) == 0)
- /* Found it. */
- return true;
-
- trun += system_dirs_len[idx] + 1;
- }
-
- return false;
-}
-
-
-static bool
is_trusted_path_normalize (const char *path, size_t len)
{
if (len == 0)
@@ -487,8 +469,7 @@ static size_t max_dirnamelen;
static struct r_search_path_elem **
fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep,
- int check_trusted, const char *what, const char *where,
- struct link_map *l)
+ const char *what, const char *where, struct link_map *l)
{
char *cp;
size_t nelems = 0;
@@ -518,13 +499,6 @@ fillin_rpath (char *rpath, struct r_sear
if (len > 0 && cp[len - 1] != '/')
cp[len++] = '/';
- /* Make sure we don't use untrusted directories if we run SUID. */
- if (__builtin_expect (check_trusted, 0) && !is_trusted_path (cp, len))
- {
- free (to_free);
- continue;
- }
-
/* See if this directory is already known. */
for (dirp = GL(dl_all_dirs); dirp != NULL; dirp = dirp->next)
if (dirp->dirnamelen == len && memcmp (cp, dirp->dirname, len) == 0)
@@ -674,7 +648,7 @@ decompose_rpath (struct r_search_path_st
_dl_signal_error (ENOMEM, NULL, NULL, errstring);
}
- fillin_rpath (copy, result, ":", 0, what, where, l);
+ fillin_rpath (copy, result, ":", what, where, l);
/* Free the copied RPATH string. `fillin_rpath' make own copies if
necessary. */
@@ -847,8 +821,7 @@ _dl_init_paths (const char *llp)
}
(void) fillin_rpath (llp_tmp, env_path_list.dirs, ":;",
- INTUSE(__libc_enable_secure), "LD_LIBRARY_PATH",
- NULL, l);
+ "LD_LIBRARY_PATH", NULL, l);
if (env_path_list.dirs[0] == NULL)
{