CVE-2014-5119 Signed-off-by: Armin Kuster Upstream commit: https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=a1a6a401ab0a3c9f15fb7eaebbdcee24192254e8 From a1a6a401ab0a3c9f15fb7eaebbdcee24192254e8 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Tue, 26 Aug 2014 19:38:59 +0200 Subject: [PATCH] __gconv_translit_find: Disable function [BZ #17187] This functionality has never worked correctly, and the implementation contained a security vulnerability (CVE-2014-5119). --- ChangeLog | 7 ++ NEWS | 9 ++- iconv/gconv_trans.c | 177 +------------------------------------------------- 3 files changed, 19 insertions(+), 174 deletions(-) Index: libc/NEWS =================================================================== --- libc.orig/NEWS +++ libc/NEWS @@ -26,7 +26,7 @@ Version 2.19 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338, 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16384, 16385, 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430, 16431, - 16453, 16474, 16506, 16510, 16529 + 16453, 16474, 16506, 16510, 16529, 17187 * Slovenian translations for glibc messages have been contributed by the Translation Project's Slovenian team of translators. Index: libc/iconv/gconv_trans.c =================================================================== --- libc.orig/iconv/gconv_trans.c +++ libc/iconv/gconv_trans.c @@ -241,181 +241,12 @@ __gconv_transliterate (struct __gconv_st 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; } Index: libc/ChangeLog =================================================================== --- libc.orig/ChangeLog +++ libc/ChangeLog @@ -1,3 +1,10 @@ +2014-08-26 Florian Weimer + + [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 [BZ #16529]