diff options
Diffstat (limited to '')
-rw-r--r-- | patches/source/glibc/glibc-2.17_CVE-2014-0475.diff | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/patches/source/glibc/glibc-2.17_CVE-2014-0475.diff b/patches/source/glibc/glibc-2.17_CVE-2014-0475.diff new file mode 100644 index 000000000..b28b8c5a3 --- /dev/null +++ b/patches/source/glibc/glibc-2.17_CVE-2014-0475.diff @@ -0,0 +1,404 @@ +From a1a7089da053642f09f84715dfe06cd3938de8da Mon Sep 17 00:00:00 2001 +From: mancha <mancha1 AT zoho DOT com> +Date: Fri, 5 Sep 2014 +Subject: CVE-2014-0475 + +This fixes a potential for directory traversal via crafted +locale-related environment variables. This is particularly +worrisome in the case suid/sgid programs inherit these +variables potentially resulting in arbitrary code execution +with elevated privileges. + +This fix for use with glibc 2.17 is based on the following +upstream commits: + +https://sourceware.org/git/?p=glibc.git;h=4e8f95a0df7c +https://sourceware.org/git/?p=glibc.git;h=d183645616b0 + +--- + locale/findlocale.c | 74 +++++++++++-- + locale/setlocale.c | 14 ++ + localedata/Makefile | 3 + + localedata/tst-setlocale3.c | 203 ++++++++++++++++++++++++++++++++++++ + 4 files changed, 278 insertions(+), 16 deletions(-) + +--- a/locale/findlocale.c ++++ b/locale/findlocale.c +@@ -17,6 +17,7 @@ + <http://www.gnu.org/licenses/>. */ + + #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_list[__LC_LAST]; + + 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 (__glibc_unlikely (namelen > 255)) ++ return 0; ++ /* Directory traversal attempt. */ ++ static const char slashdot[4] = {'/', '.', '.', '/'}; ++ if (__glibc_unlikely (memmem (name, namelen, ++ slashdot, sizeof (slashdot)) != NULL)) ++ return 0; ++ if (namelen == 2 && __glibc_unlikely (name[0] == '.' && name [1] == '.')) ++ return 0; ++ if (namelen >= 3 ++ && __glibc_unlikely (((name[0] == '.' ++ && name[1] == '.' ++ && name[2] == '/') ++ || (name[namelen - 3] == '/' ++ && name[namelen - 2] == '.' ++ && name[namelen - 1] == '.')))) ++ return 0; ++ /* If there is a slash in the name, it must start with one. */ ++ if (__glibc_unlikely (memchr (name, '/', namelen) != NULL) && name[0] != '/') ++ return 0; ++ return 1; ++} + + struct __locale_data * + internal_function +@@ -65,7 +105,7 @@ _nl_find_locale (const char *locale_path, size_t locale_path_len, + { + 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, size_t locale_path_len, + 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. */ +--- a/localedata/Makefile ++++ b/localedata/Makefile +@@ -77,7 +77,8 @@ locale_test_suite := tst_iswalnum tst_is + + tests = $(locale_test_suite) tst-digits tst-setlocale bug-iconv-trans \ + tst-leaks tst-mbswcs6 tst-xlocale1 tst-xlocale2 bug-usesetlocale \ +- tst-strfmon1 tst-sscanf bug-setlocale1 tst-setlocale2 ++ tst-strfmon1 tst-sscanf bug-setlocale1 tst-setlocale2 \ ++ tst-setlocale3 + ifeq (yes,$(build-shared)) + ifneq (no,$(PERL)) + tests: $(objpfx)mtrace-tst-leaks +--- /dev/null ++++ b/localedata/tst-setlocale3.c +@@ -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" +--- a/locale/setlocale.c ++++ b/locale/setlocale.c +@@ -273,6 +273,8 @@ setlocale (int category, const char *locale) + 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) +@@ -282,7 +284,13 @@ setlocale (int category, const char *locale) + 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 (__glibc_unlikely (locale_copy == NULL)) ++ { ++ __libc_rwlock_unlock (__libc_setlocale_lock); ++ return NULL; ++ } ++ char *np = locale_copy; + char *cp; + int cnt; + +@@ -300,6 +308,7 @@ setlocale (int category, const char *locale) + { + error_return: + __libc_rwlock_unlock (__libc_setlocale_lock); ++ free (locale_copy); + + /* Bogus category name. */ + ERROR_RETURN; +@@ -392,8 +401,9 @@ setlocale (int category, const char *locale) + /* 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; + } |