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Remove support for loadable gconv transliteration modules.
The support for transliteration modules has been non-functional for
over a decade, and the removal is prompted by security defects. The
normal gconv conversion modules are still supported. Transliteration
with //TRANSLIT is still possible, and the //IGNORE specifier
continues to be supported. (CVE-2014-5119)
Based on upstream commits a1a6a401ab0a3c9f15fb7eaebbdcee24192254e8
and f9df71e895d3552d557e783fdb9d133328195645
by Florian Weimer <fweimer@redhat.com>.
--- glibc-2.19/ChangeLog.orig 2014-02-07 04:04:38.000000000 -0500
+++ glibc-2.19/ChangeLog 2014-08-26 14:35:12.368861387 -0400
@@ -1,3 +1,10 @@
+2014-08-26 Florian Weimer <fweimer@redhat.com>
+
+ [BZ #17187]
+ * iconv/gconv_trans.c (struct known_trans, search_tree, lock,
+ trans_compare, open_translit, __gconv_translit_find):
+ Remove module loading code.
+
2014-02-06 Carlos O'Donell <carlos@redhat.com>
[BZ #16529]
--- glibc-2.19/iconv/gconv_trans.c.orig 2014-02-07 04:04:38.000000000 -0500
+++ glibc-2.19/iconv/gconv_trans.c 2014-08-26 14:37:26.269525364 -0400
@@ -238,181 +238,12 @@
return __GCONV_ILLEGAL_INPUT;
}
-
-/* Structure to represent results of found (or not) transliteration
- modules. */
-struct known_trans
-{
- /* This structure must remain the first member. */
- struct trans_struct info;
-
- char *fname;
- void *handle;
- int open_count;
-};
-
-
-/* Tree with results of previous calls to __gconv_translit_find. */
-static void *search_tree;
-
-/* We modify global data. */
-__libc_lock_define_initialized (static, lock);
-
-
-/* Compare two transliteration entries. */
-static int
-trans_compare (const void *p1, const void *p2)
-{
- const struct known_trans *s1 = (const struct known_trans *) p1;
- const struct known_trans *s2 = (const struct known_trans *) p2;
-
- return strcmp (s1->info.name, s2->info.name);
-}
-
-
-/* Open (maybe reopen) the module named in the struct. Get the function
- and data structure pointers we need. */
-static int
-open_translit (struct known_trans *trans)
-{
- __gconv_trans_query_fct queryfct;
-
- trans->handle = __libc_dlopen (trans->fname);
- if (trans->handle == NULL)
- /* Not available. */
- return 1;
-
- /* Find the required symbol. */
- queryfct = __libc_dlsym (trans->handle, "gconv_trans_context");
- if (queryfct == NULL)
- {
- /* We cannot live with that. */
- close_and_out:
- __libc_dlclose (trans->handle);
- trans->handle = NULL;
- return 1;
- }
-
- /* Get the context. */
- if (queryfct (trans->info.name, &trans->info.csnames, &trans->info.ncsnames)
- != 0)
- goto close_and_out;
-
- /* Of course we also have to have the actual function. */
- trans->info.trans_fct = __libc_dlsym (trans->handle, "gconv_trans");
- if (trans->info.trans_fct == NULL)
- goto close_and_out;
-
- /* Now the optional functions. */
- trans->info.trans_init_fct =
- __libc_dlsym (trans->handle, "gconv_trans_init");
- trans->info.trans_context_fct =
- __libc_dlsym (trans->handle, "gconv_trans_context");
- trans->info.trans_end_fct =
- __libc_dlsym (trans->handle, "gconv_trans_end");
-
- trans->open_count = 1;
-
- return 0;
-}
-
-
int
internal_function
__gconv_translit_find (struct trans_struct *trans)
{
- struct known_trans **found;
- const struct path_elem *runp;
- int res = 1;
-
- /* We have to have a name. */
- assert (trans->name != NULL);
-
- /* Acquire the lock. */
- __libc_lock_lock (lock);
-
- /* See whether we know this module already. */
- found = __tfind (trans, &search_tree, trans_compare);
- if (found != NULL)
- {
- /* Is this module available? */
- if ((*found)->handle != NULL)
- {
- /* Maybe we have to reopen the file. */
- if ((*found)->handle != (void *) -1)
- /* The object is not unloaded. */
- res = 0;
- else if (open_translit (*found) == 0)
- {
- /* Copy the data. */
- *trans = (*found)->info;
- (*found)->open_count++;
- res = 0;
- }
- }
- }
- else
- {
- size_t name_len = strlen (trans->name) + 1;
- int need_so = 0;
- struct known_trans *newp;
-
- /* We have to continue looking for the module. */
- if (__gconv_path_elem == NULL)
- __gconv_get_path ();
-
- /* See whether we have to append .so. */
- if (name_len <= 4 || memcmp (&trans->name[name_len - 4], ".so", 3) != 0)
- need_so = 1;
-
- /* Create a new entry. */
- newp = (struct known_trans *) malloc (sizeof (struct known_trans)
- + (__gconv_max_path_elem_len
- + name_len + 3)
- + name_len);
- if (newp != NULL)
- {
- char *cp;
-
- /* Clear the struct. */
- memset (newp, '\0', sizeof (struct known_trans));
-
- /* Store a copy of the module name. */
- newp->info.name = cp = (char *) (newp + 1);
- cp = __mempcpy (cp, trans->name, name_len);
-
- newp->fname = cp;
-
- /* Search in all the directories. */
- for (runp = __gconv_path_elem; runp->name != NULL; ++runp)
- {
- cp = __mempcpy (__stpcpy ((char *) newp->fname, runp->name),
- trans->name, name_len);
- if (need_so)
- memcpy (cp, ".so", sizeof (".so"));
-
- if (open_translit (newp) == 0)
- {
- /* We found a module. */
- res = 0;
- break;
- }
- }
-
- if (res)
- newp->fname = NULL;
-
- /* In any case we'll add the entry to our search tree. */
- if (__tsearch (newp, &search_tree, trans_compare) == NULL)
- {
- /* Yickes, this should not happen. Unload the object. */
- res = 1;
- /* XXX unload here. */
- }
- }
- }
-
- __libc_lock_unlock (lock);
-
- return res;
+ /* Transliteration module loading has been removed because it never
+ worked as intended and suffered from a security vulnerability.
+ Consequently, this function always fails. */
+ return 1;
}
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