171 lines
5.6 KiB
Diff
171 lines
5.6 KiB
Diff
Picked from upstream commits, but excluding changes to news and tests:
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d183645616b0533 and 4e8f95a0df7c2
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Also see https://sourceware.org/bugzilla/show_bug.cgi?id=17137
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diff --git a/locale/setlocale.c b/locale/setlocale.c
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index 9458468..6455b8b 100644
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--- a/locale/setlocale.c
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+++ b/locale/setlocale.c
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@@ -272,6 +272,8 @@ setlocale (int category, const char *locale)
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of entries of the form `CATEGORY=VALUE'. */
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const char *newnames[__LC_LAST];
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struct __locale_data *newdata[__LC_LAST];
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+ /* Copy of the locale argument, for in-place splitting. */
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+ char *locale_copy = NULL;
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/* Set all name pointers to the argument name. */
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for (category = 0; category < __LC_LAST; ++category)
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@@ -281,7 +283,13 @@ setlocale (int category, const char *locale)
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if (__glibc_unlikely (strchr (locale, ';') != NULL))
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{
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/* This is a composite name. Make a copy and split it up. */
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- char *np = strdupa (locale);
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+ locale_copy = strdup (locale);
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+ if (__glibc_unlikely (locale_copy == NULL))
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+ {
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+ __libc_rwlock_unlock (__libc_setlocale_lock);
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+ return NULL;
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+ }
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+ char *np = locale_copy;
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char *cp;
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int cnt;
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@@ -299,6 +307,7 @@ setlocale (int category, const char *locale)
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{
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error_return:
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__libc_rwlock_unlock (__libc_setlocale_lock);
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+ free (locale_copy);
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/* Bogus category name. */
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ERROR_RETURN;
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@@ -391,8 +400,9 @@ setlocale (int category, const char *locale)
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/* Critical section left. */
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__libc_rwlock_unlock (__libc_setlocale_lock);
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- /* Free the resources (the locale path variable). */
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+ /* Free the resources. */
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free (locale_path);
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+ free (locale_copy);
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return composite;
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}
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diff --git a/locale/findlocale.c b/locale/findlocale.c
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index bbaf708..22e8b53 100644
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--- a/locale/findlocale.c
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+++ b/locale/findlocale.c
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@@ -17,6 +17,7 @@
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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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+#include <errno.h>
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#include <locale.h>
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#include <stdlib.h>
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#include <string.h>
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@@ -57,6 +58,45 @@ struct loaded_l10nfile *_nl_locale_file_list[__LC_LAST];
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const char _nl_default_locale_path[] attribute_hidden = LOCALEDIR;
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+/* Checks if the name is actually present, that is, not NULL and not
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+ empty. */
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+static inline int
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+name_present (const char *name)
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+{
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+ return name != NULL && name[0] != '\0';
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+}
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+
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+/* Checks that the locale name neither extremely long, nor contains a
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+ ".." path component (to prevent directory traversal). */
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+static inline int
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+valid_locale_name (const char *name)
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+{
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+ /* Not set. */
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+ size_t namelen = strlen (name);
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+ /* Name too long. The limit is arbitrary and prevents stack overflow
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+ issues later. */
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+ if (__glibc_unlikely (namelen > 255))
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+ return 0;
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+ /* Directory traversal attempt. */
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+ static const char slashdot[4] = {'/', '.', '.', '/'};
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+ if (__glibc_unlikely (memmem (name, namelen,
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+ slashdot, sizeof (slashdot)) != NULL))
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+ return 0;
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+ if (namelen == 2 && __glibc_unlikely (name[0] == '.' && name [1] == '.'))
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+ return 0;
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+ if (namelen >= 3
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+ && __glibc_unlikely (((name[0] == '.'
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+ && name[1] == '.'
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+ && name[2] == '/')
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+ || (name[namelen - 3] == '/'
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+ && name[namelen - 2] == '.'
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+ && name[namelen - 1] == '.'))))
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+ return 0;
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+ /* If there is a slash in the name, it must start with one. */
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+ if (__glibc_unlikely (memchr (name, '/', namelen) != NULL) && name[0] != '/')
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+ return 0;
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+ return 1;
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+}
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struct __locale_data *
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internal_function
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@@ -65,7 +105,7 @@ _nl_find_locale (const char *locale_path, size_t locale_path_len,
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{
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int mask;
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/* Name of the locale for this category. */
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- char *loc_name;
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+ char *loc_name = (char *) *name;
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const char *language;
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const char *modifier;
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const char *territory;
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@@ -73,31 +113,39 @@ _nl_find_locale (const char *locale_path, size_t locale_path_len,
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const char *normalized_codeset;
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struct loaded_l10nfile *locale_file;
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- if ((*name)[0] == '\0')
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+ if (loc_name[0] == '\0')
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{
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/* The user decides which locale to use by setting environment
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variables. */
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- *name = getenv ("LC_ALL");
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- if (*name == NULL || (*name)[0] == '\0')
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- *name = getenv (_nl_category_names.str
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+ loc_name = getenv ("LC_ALL");
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+ if (!name_present (loc_name))
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+ loc_name = getenv (_nl_category_names.str
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+ _nl_category_name_idxs[category]);
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- if (*name == NULL || (*name)[0] == '\0')
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- *name = getenv ("LANG");
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+ if (!name_present (loc_name))
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+ loc_name = getenv ("LANG");
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+ if (!name_present (loc_name))
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+ loc_name = (char *) _nl_C_name;
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}
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- if (*name == NULL || (*name)[0] == '\0'
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- || (__builtin_expect (__libc_enable_secure, 0)
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- && strchr (*name, '/') != NULL))
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- *name = (char *) _nl_C_name;
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+ /* We used to fall back to the C locale if the name contains a slash
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+ character '/', but we now check for directory traversal in
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+ valid_locale_name, so this is no longer necessary. */
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- if (__builtin_expect (strcmp (*name, _nl_C_name), 1) == 0
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- || __builtin_expect (strcmp (*name, _nl_POSIX_name), 1) == 0)
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+ if (__builtin_expect (strcmp (loc_name, _nl_C_name), 1) == 0
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+ || __builtin_expect (strcmp (loc_name, _nl_POSIX_name), 1) == 0)
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{
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/* We need not load anything. The needed data is contained in
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the library itself. */
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*name = (char *) _nl_C_name;
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return _nl_C[category];
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}
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+ else if (!valid_locale_name (loc_name))
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+ {
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+ __set_errno (EINVAL);
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+ return NULL;
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+ }
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+
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+ *name = loc_name;
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/* We really have to load some data. First we try the archive,
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but only if there was no LOCPATH environment variable specified. */
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