--- /dev/null
+2014-08-21 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.
+
+diff --git a/iconv/gconv_trans.c b/iconv/gconv_trans.c
+index 1e25854..d71c029 100644
+--- a/iconv/gconv_trans.c
++++ b/iconv/gconv_trans.c
+@@ -238,181 +238,11 @@ __gconv_transliterate (struct __gconv_step *step,
+ 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;
++ /* This function always fails. Transliteration module loading is
++ not implemented. */
++ return 1;
+ }
+--
+1.9.3
+
--- /dev/null
+commit 585367266923156ac6fb789939a923641ba5aaf4
+Author: Florian Weimer <fweimer@redhat.com>
+Date: Wed May 28 14:05:03 2014 +0200
+
+ manual: Update the locale documentation
+
+commit 4e8f95a0df7c2300b830ec12c0ae1e161bc8a8a3
+Author: Florian Weimer <fweimer@redhat.com>
+Date: Mon May 12 15:24:12 2014 +0200
+
+ _nl_find_locale: Improve handling of crafted locale names [BZ #17137]
+
+ Prevent directory traversal in locale-related environment variables
+ (CVE-2014-0475).
+
+commit d183645616b0533b3acee28f1a95570bffbdf50f
+Author: Florian Weimer <fweimer@redhat.com>
+Date: Wed May 28 14:41:52 2014 +0200
+
+ setlocale: Use the heap for the copy of the locale argument
+
+ This avoids alloca calls with potentially large arguments.
+
+diff -pruN glibc-2.18/locale/findlocale.c glibc-2.18.patched/locale/findlocale.c
+--- glibc-2.18/locale/findlocale.c 2013-08-11 04:22:55.000000000 +0530
++++ glibc-2.18.patched/locale/findlocale.c 2014-08-26 16:14:50.403253778 +0530
+@@ -17,6 +17,7 @@
+ 02111-1307 USA. */
+
+ #include <assert.h>
++#include <errno.h>
+ #include <locale.h>
+ #include <stdlib.h>
+ #include <string.h>
+@@ -57,6 +58,45 @@ struct loaded_l10nfile *_nl_locale_file_
+
+ const char _nl_default_locale_path[] attribute_hidden = LOCALEDIR;
+
++/* Checks if the name is actually present, that is, not NULL and not
++ empty. */
++static inline int
++name_present (const char *name)
++{
++ return name != NULL && name[0] != '\0';
++}
++
++/* Checks that the locale name neither extremely long, nor contains a
++ ".." path component (to prevent directory traversal). */
++static inline int
++valid_locale_name (const char *name)
++{
++ /* Not set. */
++ size_t namelen = strlen (name);
++ /* Name too long. The limit is arbitrary and prevents stack overflow
++ issues later. */
++ if (__builtin_expect (namelen > 255, 0))
++ return 0;
++ /* Directory traversal attempt. */
++ static const char slashdot[4] = {'/', '.', '.', '/'};
++ if (__builtin_expect (memmem (name, namelen,
++ slashdot, sizeof (slashdot)) != NULL, 0))
++ return 0;
++ if (namelen == 2 && __builtin_expect (name[0] == '.' && name [1] == '.', 0))
++ return 0;
++ if (namelen >= 3
++ && __builtin_expect (((name[0] == '.'
++ && name[1] == '.'
++ && name[2] == '/')
++ || (name[namelen - 3] == '/'
++ && name[namelen - 2] == '.'
++ && name[namelen - 1] == '.')), 0))
++ return 0;
++ /* If there is a slash in the name, it must start with one. */
++ if (__builtin_expect (memchr (name, '/', namelen) != NULL, 0) && name[0] != '/')
++ return 0;
++ return 1;
++}
+
+ struct __locale_data *
+ internal_function
+@@ -65,7 +105,7 @@ _nl_find_locale (const char *locale_path
+ {
+ int mask;
+ /* Name of the locale for this category. */
+- char *loc_name;
++ char *loc_name = (char *) *name;
+ const char *language;
+ const char *modifier;
+ const char *territory;
+@@ -73,31 +113,39 @@ _nl_find_locale (const char *locale_path
+ const char *normalized_codeset;
+ struct loaded_l10nfile *locale_file;
+
+- if ((*name)[0] == '\0')
++ if (loc_name[0] == '\0')
+ {
+ /* The user decides which locale to use by setting environment
+ variables. */
+- *name = getenv ("LC_ALL");
+- if (*name == NULL || (*name)[0] == '\0')
+- *name = getenv (_nl_category_names.str
++ loc_name = getenv ("LC_ALL");
++ if (!name_present (loc_name))
++ loc_name = getenv (_nl_category_names.str
+ + _nl_category_name_idxs[category]);
+- if (*name == NULL || (*name)[0] == '\0')
+- *name = getenv ("LANG");
++ if (!name_present (loc_name))
++ loc_name = getenv ("LANG");
++ if (!name_present (loc_name))
++ loc_name = (char *) _nl_C_name;
+ }
+
+- if (*name == NULL || (*name)[0] == '\0'
+- || (__builtin_expect (__libc_enable_secure, 0)
+- && strchr (*name, '/') != NULL))
+- *name = (char *) _nl_C_name;
++ /* We used to fall back to the C locale if the name contains a slash
++ character '/', but we now check for directory traversal in
++ valid_locale_name, so this is no longer necessary. */
+
+- if (__builtin_expect (strcmp (*name, _nl_C_name), 1) == 0
+- || __builtin_expect (strcmp (*name, _nl_POSIX_name), 1) == 0)
++ if (__builtin_expect (strcmp (loc_name, _nl_C_name), 1) == 0
++ || __builtin_expect (strcmp (loc_name, _nl_POSIX_name), 1) == 0)
+ {
+ /* We need not load anything. The needed data is contained in
+ the library itself. */
+ *name = (char *) _nl_C_name;
+ return _nl_C[category];
+ }
++ else if (!valid_locale_name (loc_name))
++ {
++ __set_errno (EINVAL);
++ return NULL;
++ }
++
++ *name = loc_name;
+
+ /* We really have to load some data. First we try the archive,
+ but only if there was no LOCPATH environment variable specified. */
+diff -pruN glibc-2.18/locale/setlocale.c glibc-2.18.patched/locale/setlocale.c
+--- glibc-2.18/locale/setlocale.c 2013-08-11 04:22:55.000000000 +0530
++++ glibc-2.18.patched/locale/setlocale.c 2014-08-26 16:14:50.401253764 +0530
+@@ -272,6 +272,8 @@ setlocale (int category, const char *loc
+ of entries of the form `CATEGORY=VALUE'. */
+ const char *newnames[__LC_LAST];
+ struct __locale_data *newdata[__LC_LAST];
++ /* Copy of the locale argument, for in-place splitting. */
++ char *locale_copy = NULL;
+
+ /* Set all name pointers to the argument name. */
+ for (category = 0; category < __LC_LAST; ++category)
+@@ -281,7 +283,13 @@ setlocale (int category, const char *loc
+ if (__builtin_expect (strchr (locale, ';') != NULL, 0))
+ {
+ /* This is a composite name. Make a copy and split it up. */
+- char *np = strdupa (locale);
++ locale_copy = strdup (locale);
++ if (__builtin_expect (locale_copy == NULL, 0))
++ {
++ __libc_rwlock_unlock (__libc_setlocale_lock);
++ return NULL;
++ }
++ char *np = locale_copy;
+ char *cp;
+ int cnt;
+
+@@ -299,6 +307,7 @@ setlocale (int category, const char *loc
+ {
+ error_return:
+ __libc_rwlock_unlock (__libc_setlocale_lock);
++ free (locale_copy);
+
+ /* Bogus category name. */
+ ERROR_RETURN;
+@@ -391,8 +400,9 @@ setlocale (int category, const char *loc
+ /* Critical section left. */
+ __libc_rwlock_unlock (__libc_setlocale_lock);
+
+- /* Free the resources (the locale path variable). */
++ /* Free the resources. */
+ free (locale_path);
++ free (locale_copy);
+
+ return composite;
+ }
+diff -pruN glibc-2.18/localedata/Makefile glibc-2.18.patched/localedata/Makefile
+--- glibc-2.18/localedata/Makefile 2014-08-26 16:15:22.656474571 +0530
++++ glibc-2.18.patched/localedata/Makefile 2014-08-26 16:14:50.403253778 +0530
+@@ -77,7 +77,7 @@ locale_test_suite := tst_iswalnum tst_is
+
+ tests = $(locale_test_suite) tst-digits tst-setlocale bug-iconv-trans \
+ tst-leaks tst-mbswcs6 tst-xlocale1 tst-xlocale2 bug-usesetlocale \
+- tst-strfmon1 tst-sscanf tst-strptime
++ tst-strfmon1 tst-sscanf tst-strptime tst-setlocale3
+ ifeq (yes,$(build-shared))
+ ifneq (no,$(PERL))
+ tests: $(objpfx)mtrace-tst-leaks
+@@ -288,6 +288,7 @@ tst-strfmon1-ENV = $(TEST_MBWC_ENV)
+ tst-strptime-ENV = $(TEST_MBWC_ENV)
+
+ tst-setlocale-ENV = LOCPATH=$(common-objpfx)localedata LC_ALL=ja_JP.EUC-JP
++tst-setlocale3-ENV = LOCPATH=$(common-objpfx)localedata
+
+ bug-iconv-trans-ENV = LOCPATH=$(common-objpfx)localedata
+
+diff -pruN glibc-2.18/localedata/tst-setlocale3.c glibc-2.18.patched/localedata/tst-setlocale3.c
+--- glibc-2.18/localedata/tst-setlocale3.c 1970-01-01 05:30:00.000000000 +0530
++++ glibc-2.18.patched/localedata/tst-setlocale3.c 2014-08-26 16:14:50.403253778 +0530
+@@ -0,0 +1,203 @@
++/* Regression test for setlocale invalid environment variable handling.
++ Copyright (C) 2014 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <http://www.gnu.org/licenses/>. */
++
++#include <locale.h>
++#include <stdio.h>
++#include <stdlib.h>
++#include <string.h>
++
++/* The result of setlocale may be overwritten by subsequent calls, so
++ this wrapper makes a copy. */
++static char *
++setlocale_copy (int category, const char *locale)
++{
++ const char *result = setlocale (category, locale);
++ if (result == NULL)
++ return NULL;
++ return strdup (result);
++}
++
++static char *de_locale;
++
++static void
++setlocale_fail (const char *envstring)
++{
++ setenv ("LC_CTYPE", envstring, 1);
++ if (setlocale (LC_CTYPE, "") != NULL)
++ {
++ printf ("unexpected setlocale success for \"%s\" locale\n", envstring);
++ exit (1);
++ }
++ const char *newloc = setlocale (LC_CTYPE, NULL);
++ if (strcmp (newloc, de_locale) != 0)
++ {
++ printf ("failed setlocale call \"%s\" changed locale to \"%s\"\n",
++ envstring, newloc);
++ exit (1);
++ }
++}
++
++static void
++setlocale_success (const char *envstring)
++{
++ setenv ("LC_CTYPE", envstring, 1);
++ char *newloc = setlocale_copy (LC_CTYPE, "");
++ if (newloc == NULL)
++ {
++ printf ("setlocale for \"%s\": %m\n", envstring);
++ exit (1);
++ }
++ if (strcmp (newloc, de_locale) == 0)
++ {
++ printf ("setlocale with LC_CTYPE=\"%s\" left locale at \"%s\"\n",
++ envstring, de_locale);
++ exit (1);
++ }
++ if (setlocale (LC_CTYPE, de_locale) == NULL)
++ {
++ printf ("restoring locale \"%s\" with LC_CTYPE=\"%s\": %m\n",
++ de_locale, envstring);
++ exit (1);
++ }
++ char *newloc2 = setlocale_copy (LC_CTYPE, newloc);
++ if (newloc2 == NULL)
++ {
++ printf ("restoring locale \"%s\" following \"%s\": %m\n",
++ newloc, envstring);
++ exit (1);
++ }
++ if (strcmp (newloc, newloc2) != 0)
++ {
++ printf ("representation of locale \"%s\" changed from \"%s\" to \"%s\"",
++ envstring, newloc, newloc2);
++ exit (1);
++ }
++ free (newloc);
++ free (newloc2);
++
++ if (setlocale (LC_CTYPE, de_locale) == NULL)
++ {
++ printf ("restoring locale \"%s\" with LC_CTYPE=\"%s\": %m\n",
++ de_locale, envstring);
++ exit (1);
++ }
++}
++
++/* Checks that a known-good locale still works if LC_ALL contains a
++ value which should be ignored. */
++static void
++setlocale_ignore (const char *to_ignore)
++{
++ const char *fr_locale = "fr_FR.UTF-8";
++ setenv ("LC_CTYPE", fr_locale, 1);
++ char *expected_locale = setlocale_copy (LC_CTYPE, "");
++ if (expected_locale == NULL)
++ {
++ printf ("setlocale with LC_CTYPE=\"%s\" failed: %m\n", fr_locale);
++ exit (1);
++ }
++ if (setlocale (LC_CTYPE, de_locale) == NULL)
++ {
++ printf ("failed to restore locale: %m\n");
++ exit (1);
++ }
++ unsetenv ("LC_CTYPE");
++
++ setenv ("LC_ALL", to_ignore, 1);
++ setenv ("LC_CTYPE", fr_locale, 1);
++ const char *actual_locale = setlocale (LC_CTYPE, "");
++ if (actual_locale == NULL)
++ {
++ printf ("setlocale with LC_ALL, LC_CTYPE=\"%s\" failed: %m\n",
++ fr_locale);
++ exit (1);
++ }
++ if (strcmp (actual_locale, expected_locale) != 0)
++ {
++ printf ("setlocale under LC_ALL failed: got \"%s\", expected \"%s\"\n",
++ actual_locale, expected_locale);
++ exit (1);
++ }
++ unsetenv ("LC_CTYPE");
++ setlocale_success (fr_locale);
++ unsetenv ("LC_ALL");
++ free (expected_locale);
++}
++
++static int
++do_test (void)
++{
++ /* The glibc test harness sets this environment variable
++ uncondionally. */
++ unsetenv ("LC_ALL");
++
++ de_locale = setlocale_copy (LC_CTYPE, "de_DE.UTF-8");
++ if (de_locale == NULL)
++ {
++ printf ("setlocale (LC_CTYPE, \"de_DE.UTF-8\"): %m\n");
++ return 1;
++ }
++ setlocale_success ("C");
++ setlocale_success ("en_US.UTF-8");
++ setlocale_success ("/en_US.UTF-8");
++ setlocale_success ("//en_US.UTF-8");
++ setlocale_ignore ("");
++
++ setlocale_fail ("does-not-exist");
++ setlocale_fail ("/");
++ setlocale_fail ("/../localedata/en_US.UTF-8");
++ setlocale_fail ("en_US.UTF-8/");
++ setlocale_fail ("en_US.UTF-8/..");
++ setlocale_fail ("en_US.UTF-8/../en_US.UTF-8");
++ setlocale_fail ("../localedata/en_US.UTF-8");
++ {
++ size_t large_length = 1024;
++ char *large_name = malloc (large_length + 1);
++ if (large_name == NULL)
++ {
++ puts ("malloc failure");
++ return 1;
++ }
++ memset (large_name, '/', large_length);
++ const char *suffix = "en_US.UTF-8";
++ strcpy (large_name + large_length - strlen (suffix), suffix);
++ setlocale_fail (large_name);
++ free (large_name);
++ }
++ {
++ size_t huge_length = 64 * 1024 * 1024;
++ char *huge_name = malloc (huge_length + 1);
++ if (huge_name == NULL)
++ {
++ puts ("malloc failure");
++ return 1;
++ }
++ memset (huge_name, 'X', huge_length);
++ huge_name[huge_length] = '\0';
++ /* Construct a composite locale specification. */
++ const char *prefix = "LC_CTYPE=de_DE.UTF-8;LC_TIME=";
++ memcpy (huge_name, prefix, strlen (prefix));
++ setlocale_fail (huge_name);
++ free (huge_name);
++ }
++
++ return 0;
++}
++
++#define TEST_FUNCTION do_test ()
++#include "../test-skeleton.c"
+diff -pruN glibc-2.18/manual/locale.texi glibc-2.18.patched/manual/locale.texi
+--- glibc-2.18/manual/locale.texi 2013-08-11 04:22:55.000000000 +0530
++++ glibc-2.18.patched/manual/locale.texi 2014-08-26 16:14:50.404253785 +0530
+@@ -29,6 +29,7 @@ will follow the conventions preferred by
+ * Setting the Locale:: How a program specifies the locale
+ with library functions.
+ * Standard Locales:: Locale names available on all systems.
++* Locale Names:: Format of system-specific locale names.
+ * Locale Information:: How to access the information for the locale.
+ * Formatting Numbers:: A dedicated function to format numbers.
+ * Yes-or-No Questions:: Check a Response against the locale.
+@@ -99,14 +100,16 @@ locale named @samp{espana-castellano} to
+ most of Spain.
+
+ The set of locales supported depends on the operating system you are
+-using, and so do their names. We can't make any promises about what
+-locales will exist, except for one standard locale called @samp{C} or
+-@samp{POSIX}. Later we will describe how to construct locales.
+-@comment (@pxref{Building Locale Files}).
++using, and so do their names, except that the standard locale called
++@samp{C} or @samp{POSIX} always exist. @xref{Locale Names}.
++
++In order to force the system to always use the default locale, the
++user can set the @code{LC_ALL} environment variable to @samp{C}.
+
+ @cindex combining locales
+-A user also has the option of specifying different locales for different
+-purposes---in effect, choosing a mixture of multiple locales.
++A user also has the option of specifying different locales for
++different purposes---in effect, choosing a mixture of multiple
++locales. @xref{Locale Categories}.
+
+ For example, the user might specify the locale @samp{espana-castellano}
+ for most purposes, but specify the locale @samp{usa-english} for
+@@ -120,7 +123,7 @@ which locales apply. However, the user
+ for a particular subset of those purposes.
+
+ @node Locale Categories, Setting the Locale, Choosing Locale, Locales
+-@section Categories of Activities that Locales Affect
++@section Locale Categories
+ @cindex categories for locales
+ @cindex locale categories
+
+@@ -128,7 +131,11 @@ The purposes that locales serve are grou
+ that a user or a program can choose the locale for each category
+ independently. Here is a table of categories; each name is both an
+ environment variable that a user can set, and a macro name that you can
+-use as an argument to @code{setlocale}.
++use as the first argument to @code{setlocale}.
++
++The contents of the environment variable (or the string in the second
++argument to @code{setlocale}) has to be a valid locale name.
++@xref{Locale Names}.
+
+ @vtable @code
+ @comment locale.h
+@@ -172,7 +179,7 @@ for affirmative and negative responses.
+ @comment locale.h
+ @comment ISO
+ @item LC_ALL
+-This is not an environment variable; it is only a macro that you can use
++This is not a category; it is only a macro that you can use
+ with @code{setlocale} to set a single locale for all purposes. Setting
+ this environment variable overwrites all selections by the other
+ @code{LC_*} variables or @code{LANG}.
+@@ -225,13 +232,7 @@ The symbols in this section are defined
+ @comment ISO
+ @deftypefun {char *} setlocale (int @var{category}, const char *@var{locale})
+ The function @code{setlocale} sets the current locale for category
+-@var{category} to @var{locale}. A list of all the locales the system
+-provides can be created by running
+-
+-@pindex locale
+-@smallexample
+- locale -a
+-@end smallexample
++@var{category} to @var{locale}.
+
+ If @var{category} is @code{LC_ALL}, this specifies the locale for all
+ purposes. The other possible values of @var{category} specify an
+@@ -256,10 +257,9 @@ is passed in as @var{locale} parameter.
+
+ When you read the current locale for category @code{LC_ALL}, the value
+ encodes the entire combination of selected locales for all categories.
+-In this case, the value is not just a single locale name. In fact, we
+-don't make any promises about what it looks like. But if you specify
+-the same ``locale name'' with @code{LC_ALL} in a subsequent call to
+-@code{setlocale}, it restores the same combination of locale selections.
++If you specify the same ``locale name'' with @code{LC_ALL} in a
++subsequent call to @code{setlocale}, it restores the same combination
++of locale selections.
+
+ To be sure you can use the returned string encoding the currently selected
+ locale at a later time, you must make a copy of the string. It is not
+@@ -275,6 +275,11 @@ for @var{category}.
+ If a nonempty string is given for @var{locale}, then the locale of that
+ name is used if possible.
+
++The effective locale name (either the second argument to
++@code{setlocale}, or if the argument is an empty string, the name
++obtained from the process environment) must be valid locale name.
++@xref{Locale Names}.
++
+ If you specify an invalid locale name, @code{setlocale} returns a null
+ pointer and leaves the current locale unchanged.
+ @end deftypefun
+@@ -328,7 +323,7 @@ locale categories, and future versions o
+ portability, assume that any symbol beginning with @samp{LC_} might be
+ defined in @file{locale.h}.
+
+-@node Standard Locales, Locale Information, Setting the Locale, Locales
++@node Standard Locales, Locale Names, Setting the Locale, Locales
+ @section Standard Locales
+
+ The only locale names you can count on finding on all operating systems
+@@ -362,7 +357,94 @@ with the environment, rather than trying
+ locale explicitly by name. Remember, different machines might have
+ different sets of locales installed.
+
+-@node Locale Information, Formatting Numbers, Standard Locales, Locales
++@node Locale Names, Locale Information, Standard Locales, Locales
++@section Locale Names
++
++The following command prints a list of locales supported by the
++system:
++
++@pindex locale
++@smallexample
++ locale -a
++@end smallexample
++
++@strong{Portability Note:} With the notable exception of the standard
++locale names @samp{C} and @samp{POSIX}, locale names are
++system-specific.
++
++Most locale names follow XPG syntax and consist of up to four parts:
++
++@smallexample
++@var{language}[_@var{territory}[.@var{codeset}]][@@@var{modifier}]
++@end smallexample
++
++Beside the first part, all of them are allowed to be missing. If the
++full specified locale is not found, less specific ones are looked for.
++The various parts will be stripped off, in the following order:
++
++@enumerate
++@item
++codeset
++@item
++normalized codeset
++@item
++territory
++@item
++modifier
++@end enumerate
++
++For example, the locale name @samp{de_AT.iso885915@@euro} denotes a
++German-language locale for use in Austria, using the ISO-8859-15
++(Latin-9) character set, and with the Euro as the currency symbol.
++
++In addition to locale names which follow XPG syntax, systems may
++provide aliases such as @samp{german}. Both categories of names must
++not contain the slash character @samp{/}.
++
++If the locale name starts with a slash @samp{/}, it is treated as a
++path relative to the configured locale directories; see @code{LOCPATH}
++below. The specified path must not contain a component @samp{..}, or
++the name is invalid, and @code{setlocale} will fail.
++
++@strong{Portability Note:} POSIX suggests that if a locale name starts
++with a slash @samp{/}, it is resolved as an absolute path. However,
++the GNU C Library treats it as a relative path under the directories listed
++in @code{LOCPATH} (or the default locale directory if @code{LOCPATH}
++is unset).
++
++Locale names which are longer than an implementation-defined limit are
++invalid and cause @code{setlocale} to fail.
++
++As a special case, locale names used with @code{LC_ALL} can combine
++several locales, reflecting different locale settings for different
++categories. For example, you might want to use a U.S. locale with ISO
++A4 paper format, so you set @code{LANG} to @samp{en_US.UTF-8}, and
++@code{LC_PAPER} to @samp{de_DE.UTF-8}. In this case, the
++@code{LC_ALL}-style combined locale name is
++
++@smallexample
++LC_CTYPE=en_US.UTF-8;LC_TIME=en_US.UTF-8;LC_PAPER=de_DE.UTF-8;@dots{}
++@end smallexample
++
++followed by other category settings not shown here.
++
++@vindex LOCPATH
++The path used for finding locale data can be set using the
++@code{LOCPATH} environment variable. This variable lists the
++directories in which to search for locale definitions, separated by a
++colon @samp{:}.
++
++The default path for finding locale data is system specific. A typical
++value for the @code{LOCPATH} default is:
++
++@smallexample
++/usr/share/locale
++@end smallexample
++
++The value of @code{LOCPATH} is ignored by privileged programs for
++security reasons, and only the default directory is used.
++
++@node Locale Information, Formatting Numbers, Locale Names, Locales
+ @section Accessing Locale Information
+
+ There are several ways to access locale information. The simplest
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