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__gconv_translit_find: Disable function [BZ #17187]
This functionality has never worked correctly, and the implementation contained a security vulnerability (CVE-2014-5119).
This commit is contained in:
Florian Weimer
parent
e4e7cfd287
commit
a1a6a401ab
@ -1,3 +1,10 @@
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2014-08-26 Florian Weimer <fweimer@redhat.com>
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[BZ #17187]
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* iconv/gconv_trans.c (struct known_trans, search_tree, lock,
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trans_compare, open_translit, __gconv_translit_find):
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Remove module loading code.
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2014-08-26 Allan McRae <allan@archlinux.org>
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* po/vi.po: Update Vietnamese translation from translation project.
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9
NEWS
9
NEWS
@ -23,7 +23,7 @@ Version 2.20
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16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022, 17031,
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17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078, 17079,
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17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150, 17153,
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17213, 17259, 17261, 17262, 17263.
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17187, 17213, 17259, 17261, 17262, 17263.
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* Reverted change of ABI data structures for s390 and s390x:
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On s390 and s390x the size of struct ucontext and jmp_buf was increased in
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@ -108,6 +108,13 @@ Version 2.20
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handle the new instruction encodings. This is known to affect Valgrind
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versions up through 3.9 (but will be fixed in the forthcoming 3.10
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release), and might affect other tools that do instruction emulation.
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* Support for loadable gconv transliteration modules has been removed.
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The support for transliteration modules has been non-functional for
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over a decade, and the removal is prompted by security defects. The
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normal gconv conversion modules are still supported. Transliteration
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with //TRANSLIT is still possible, and the //IGNORE specifier
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continues to be supported. (CVE-2014-5519)
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Version 2.19
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@ -238,181 +238,12 @@ __gconv_transliterate (struct __gconv_step *step,
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return __GCONV_ILLEGAL_INPUT;
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}
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/* Structure to represent results of found (or not) transliteration
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modules. */
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struct known_trans
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{
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/* This structure must remain the first member. */
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struct trans_struct info;
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char *fname;
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void *handle;
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int open_count;
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};
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/* Tree with results of previous calls to __gconv_translit_find. */
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static void *search_tree;
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/* We modify global data. */
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__libc_lock_define_initialized (static, lock);
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/* Compare two transliteration entries. */
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static int
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trans_compare (const void *p1, const void *p2)
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{
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const struct known_trans *s1 = (const struct known_trans *) p1;
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const struct known_trans *s2 = (const struct known_trans *) p2;
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return strcmp (s1->info.name, s2->info.name);
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}
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/* Open (maybe reopen) the module named in the struct. Get the function
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and data structure pointers we need. */
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static int
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open_translit (struct known_trans *trans)
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{
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__gconv_trans_query_fct queryfct;
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trans->handle = __libc_dlopen (trans->fname);
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if (trans->handle == NULL)
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/* Not available. */
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return 1;
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/* Find the required symbol. */
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queryfct = __libc_dlsym (trans->handle, "gconv_trans_context");
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if (queryfct == NULL)
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{
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/* We cannot live with that. */
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close_and_out:
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__libc_dlclose (trans->handle);
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trans->handle = NULL;
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return 1;
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}
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/* Get the context. */
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if (queryfct (trans->info.name, &trans->info.csnames, &trans->info.ncsnames)
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!= 0)
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goto close_and_out;
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/* Of course we also have to have the actual function. */
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trans->info.trans_fct = __libc_dlsym (trans->handle, "gconv_trans");
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if (trans->info.trans_fct == NULL)
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goto close_and_out;
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/* Now the optional functions. */
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trans->info.trans_init_fct =
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__libc_dlsym (trans->handle, "gconv_trans_init");
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trans->info.trans_context_fct =
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__libc_dlsym (trans->handle, "gconv_trans_context");
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trans->info.trans_end_fct =
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__libc_dlsym (trans->handle, "gconv_trans_end");
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trans->open_count = 1;
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return 0;
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}
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int
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internal_function
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__gconv_translit_find (struct trans_struct *trans)
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{
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struct known_trans **found;
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const struct path_elem *runp;
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int res = 1;
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/* We have to have a name. */
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assert (trans->name != NULL);
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/* Acquire the lock. */
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__libc_lock_lock (lock);
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/* See whether we know this module already. */
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found = __tfind (trans, &search_tree, trans_compare);
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if (found != NULL)
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{
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/* Is this module available? */
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if ((*found)->handle != NULL)
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{
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/* Maybe we have to reopen the file. */
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if ((*found)->handle != (void *) -1)
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/* The object is not unloaded. */
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res = 0;
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else if (open_translit (*found) == 0)
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{
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/* Copy the data. */
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*trans = (*found)->info;
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(*found)->open_count++;
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res = 0;
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}
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}
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}
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else
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{
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size_t name_len = strlen (trans->name) + 1;
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int need_so = 0;
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struct known_trans *newp;
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/* We have to continue looking for the module. */
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if (__gconv_path_elem == NULL)
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__gconv_get_path ();
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/* See whether we have to append .so. */
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if (name_len <= 4 || memcmp (&trans->name[name_len - 4], ".so", 3) != 0)
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need_so = 1;
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/* Create a new entry. */
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newp = (struct known_trans *) malloc (sizeof (struct known_trans)
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+ (__gconv_max_path_elem_len
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+ name_len + 3)
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+ name_len);
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if (newp != NULL)
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{
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char *cp;
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/* Clear the struct. */
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memset (newp, '\0', sizeof (struct known_trans));
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/* Store a copy of the module name. */
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newp->info.name = cp = (char *) (newp + 1);
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cp = __mempcpy (cp, trans->name, name_len);
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newp->fname = cp;
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/* Search in all the directories. */
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for (runp = __gconv_path_elem; runp->name != NULL; ++runp)
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{
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cp = __mempcpy (__stpcpy ((char *) newp->fname, runp->name),
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trans->name, name_len);
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if (need_so)
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memcpy (cp, ".so", sizeof (".so"));
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if (open_translit (newp) == 0)
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{
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/* We found a module. */
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res = 0;
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break;
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}
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}
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if (res)
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newp->fname = NULL;
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/* In any case we'll add the entry to our search tree. */
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if (__tsearch (newp, &search_tree, trans_compare) == NULL)
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{
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/* Yickes, this should not happen. Unload the object. */
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res = 1;
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/* XXX unload here. */
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}
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}
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}
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__libc_lock_unlock (lock);
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return res;
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/* Transliteration module loading has been removed because it never
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worked as intended and suffered from a security vulnerability.
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Consequently, this function always fails. */
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return 1;
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}
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