Tobias Stoeckmann
1a823cdeb9
The data type off_t can be 64 on 32 bit systems if they have large file support. Since mmap expects a size_t with 32 bits as second argument truncation could occur. At worst these huge files could lead to mmaps smaller than the previous check for small files. This in turn shouldn't have a lot of impact because mmap allocates at page size boundaries. This also made the PAGE_ALIGN call in open_mmap unneeded. In fact it was neither in sync with other mmap calls nor with its own munmap counterpart in error path. If such large files are encountered, which is very unlikely in these code paths, treat them with the same error as if they are too small.
348 lines
9.6 KiB
C
348 lines
9.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <langinfo.h>
|
|
#include <libintl.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "def.h"
|
|
#include "dirent-util.h"
|
|
#include "env-util.h"
|
|
#include "fd-util.h"
|
|
#include "fileio.h"
|
|
#include "hashmap.h"
|
|
#include "locale-util.h"
|
|
#include "path-util.h"
|
|
#include "set.h"
|
|
#include "string-table.h"
|
|
#include "string-util.h"
|
|
#include "strv.h"
|
|
#include "utf8.h"
|
|
|
|
static char *normalize_locale(const char *name) {
|
|
const char *e;
|
|
|
|
/* Locale names are weird: glibc has some magic rules when looking for the charset name on disk: it
|
|
* lowercases everything, and removes most special chars. This means the official .UTF-8 suffix
|
|
* becomes .utf8 when looking things up on disk. When enumerating locales, let's do the reverse
|
|
* operation, and go back to ".UTF-8" which appears to be the more commonly accepted name. We only do
|
|
* that for UTF-8 however, since it's kinda the only charset that matters. */
|
|
|
|
e = endswith(name, ".utf8");
|
|
if (e) {
|
|
_cleanup_free_ char *prefix = NULL;
|
|
|
|
prefix = strndup(name, e - name);
|
|
if (!prefix)
|
|
return NULL;
|
|
|
|
return strjoin(prefix, ".UTF-8");
|
|
}
|
|
|
|
e = strstr(name, ".utf8@");
|
|
if (e) {
|
|
_cleanup_free_ char *prefix = NULL;
|
|
|
|
prefix = strndup(name, e - name);
|
|
if (!prefix)
|
|
return NULL;
|
|
|
|
return strjoin(prefix, ".UTF-8@", e + 6);
|
|
}
|
|
|
|
return strdup(name);
|
|
}
|
|
|
|
static int add_locales_from_archive(Set *locales) {
|
|
/* Stolen from glibc... */
|
|
|
|
struct locarhead {
|
|
uint32_t magic;
|
|
/* Serial number. */
|
|
uint32_t serial;
|
|
/* Name hash table. */
|
|
uint32_t namehash_offset;
|
|
uint32_t namehash_used;
|
|
uint32_t namehash_size;
|
|
/* String table. */
|
|
uint32_t string_offset;
|
|
uint32_t string_used;
|
|
uint32_t string_size;
|
|
/* Table with locale records. */
|
|
uint32_t locrectab_offset;
|
|
uint32_t locrectab_used;
|
|
uint32_t locrectab_size;
|
|
/* MD5 sum hash table. */
|
|
uint32_t sumhash_offset;
|
|
uint32_t sumhash_used;
|
|
uint32_t sumhash_size;
|
|
};
|
|
|
|
struct namehashent {
|
|
/* Hash value of the name. */
|
|
uint32_t hashval;
|
|
/* Offset of the name in the string table. */
|
|
uint32_t name_offset;
|
|
/* Offset of the locale record. */
|
|
uint32_t locrec_offset;
|
|
};
|
|
|
|
const struct locarhead *h;
|
|
const struct namehashent *e;
|
|
const void *p = MAP_FAILED;
|
|
_cleanup_close_ int fd = -1;
|
|
size_t sz = 0;
|
|
struct stat st;
|
|
int r;
|
|
|
|
fd = open("/usr/lib/locale/locale-archive", O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return errno == ENOENT ? 0 : -errno;
|
|
|
|
if (fstat(fd, &st) < 0)
|
|
return -errno;
|
|
|
|
if (!S_ISREG(st.st_mode))
|
|
return -EBADMSG;
|
|
|
|
if (st.st_size < (off_t) sizeof(struct locarhead))
|
|
return -EBADMSG;
|
|
|
|
if (file_offset_beyond_memory_size(st.st_size))
|
|
return -EFBIG;
|
|
|
|
p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
|
|
if (p == MAP_FAILED)
|
|
return -errno;
|
|
|
|
h = (const struct locarhead *) p;
|
|
if (h->magic != 0xde020109 ||
|
|
h->namehash_offset + h->namehash_size > st.st_size ||
|
|
h->string_offset + h->string_size > st.st_size ||
|
|
h->locrectab_offset + h->locrectab_size > st.st_size ||
|
|
h->sumhash_offset + h->sumhash_size > st.st_size) {
|
|
r = -EBADMSG;
|
|
goto finish;
|
|
}
|
|
|
|
e = (const struct namehashent*) ((const uint8_t*) p + h->namehash_offset);
|
|
for (size_t i = 0; i < h->namehash_size; i++) {
|
|
char *z;
|
|
|
|
if (e[i].locrec_offset == 0)
|
|
continue;
|
|
|
|
if (!utf8_is_valid((char*) p + e[i].name_offset))
|
|
continue;
|
|
|
|
z = normalize_locale((char*) p + e[i].name_offset);
|
|
if (!z) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
r = set_consume(locales, z);
|
|
if (r < 0)
|
|
goto finish;
|
|
}
|
|
|
|
r = 0;
|
|
|
|
finish:
|
|
if (p != MAP_FAILED)
|
|
munmap((void*) p, sz);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int add_locales_from_libdir (Set *locales) {
|
|
_cleanup_closedir_ DIR *dir = NULL;
|
|
int r;
|
|
|
|
dir = opendir("/usr/lib/locale");
|
|
if (!dir)
|
|
return errno == ENOENT ? 0 : -errno;
|
|
|
|
FOREACH_DIRENT(de, dir, return -errno) {
|
|
char *z;
|
|
|
|
if (de->d_type != DT_DIR)
|
|
continue;
|
|
|
|
z = normalize_locale(de->d_name);
|
|
if (!z)
|
|
return -ENOMEM;
|
|
|
|
r = set_consume(locales, z);
|
|
if (r < 0 && r != -EEXIST)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int get_locales(char ***ret) {
|
|
_cleanup_set_free_ Set *locales = NULL;
|
|
_cleanup_strv_free_ char **l = NULL;
|
|
int r;
|
|
|
|
locales = set_new(&string_hash_ops);
|
|
if (!locales)
|
|
return -ENOMEM;
|
|
|
|
r = add_locales_from_archive(locales);
|
|
if (r < 0 && r != -ENOENT)
|
|
return r;
|
|
|
|
r = add_locales_from_libdir(locales);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
l = set_get_strv(locales);
|
|
if (!l)
|
|
return -ENOMEM;
|
|
|
|
r = getenv_bool("SYSTEMD_LIST_NON_UTF8_LOCALES");
|
|
if (r == -ENXIO || r == 0) {
|
|
char **a, **b;
|
|
|
|
/* Filter out non-UTF-8 locales, because it's 2019, by default */
|
|
for (a = b = l; *a; a++) {
|
|
|
|
if (endswith(*a, "UTF-8") ||
|
|
strstr(*a, ".UTF-8@"))
|
|
*(b++) = *a;
|
|
else
|
|
free(*a);
|
|
}
|
|
|
|
*b = NULL;
|
|
|
|
} else if (r < 0)
|
|
log_debug_errno(r, "Failed to parse $SYSTEMD_LIST_NON_UTF8_LOCALES as boolean");
|
|
|
|
strv_sort(l);
|
|
|
|
*ret = TAKE_PTR(l);
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool locale_is_valid(const char *name) {
|
|
|
|
if (isempty(name))
|
|
return false;
|
|
|
|
if (strlen(name) >= 128)
|
|
return false;
|
|
|
|
if (!utf8_is_valid(name))
|
|
return false;
|
|
|
|
if (!filename_is_valid(name))
|
|
return false;
|
|
|
|
if (!string_is_safe(name))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int locale_is_installed(const char *name) {
|
|
if (!locale_is_valid(name))
|
|
return false;
|
|
|
|
if (STR_IN_SET(name, "C", "POSIX")) /* These ones are always OK */
|
|
return true;
|
|
|
|
_cleanup_(freelocalep) locale_t loc =
|
|
newlocale(LC_ALL_MASK, name, 0);
|
|
if (loc == (locale_t) 0)
|
|
return errno == ENOMEM ? -ENOMEM : false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void init_gettext(void) {
|
|
setlocale(LC_ALL, "");
|
|
textdomain(GETTEXT_PACKAGE);
|
|
}
|
|
|
|
bool is_locale_utf8(void) {
|
|
const char *set;
|
|
static int cached_answer = -1;
|
|
|
|
/* Note that we default to 'true' here, since today UTF8 is
|
|
* pretty much supported everywhere. */
|
|
|
|
if (cached_answer >= 0)
|
|
goto out;
|
|
|
|
if (!setlocale(LC_ALL, "")) {
|
|
cached_answer = true;
|
|
goto out;
|
|
}
|
|
|
|
set = nl_langinfo(CODESET);
|
|
if (!set) {
|
|
cached_answer = true;
|
|
goto out;
|
|
}
|
|
|
|
if (streq(set, "UTF-8")) {
|
|
cached_answer = true;
|
|
goto out;
|
|
}
|
|
|
|
/* For LC_CTYPE=="C" return true, because CTYPE is effectively
|
|
* unset and everything can do to UTF-8 nowadays. */
|
|
set = setlocale(LC_CTYPE, NULL);
|
|
if (!set) {
|
|
cached_answer = true;
|
|
goto out;
|
|
}
|
|
|
|
/* Check result, but ignore the result if C was set
|
|
* explicitly. */
|
|
cached_answer =
|
|
STR_IN_SET(set, "C", "POSIX") &&
|
|
!getenv("LC_ALL") &&
|
|
!getenv("LC_CTYPE") &&
|
|
!getenv("LANG");
|
|
|
|
out:
|
|
return (bool) cached_answer;
|
|
}
|
|
|
|
void locale_variables_free(char *l[_VARIABLE_LC_MAX]) {
|
|
if (!l)
|
|
return;
|
|
|
|
for (LocaleVariable i = 0; i < _VARIABLE_LC_MAX; i++)
|
|
l[i] = mfree(l[i]);
|
|
}
|
|
|
|
static const char * const locale_variable_table[_VARIABLE_LC_MAX] = {
|
|
[VARIABLE_LANG] = "LANG",
|
|
[VARIABLE_LANGUAGE] = "LANGUAGE",
|
|
[VARIABLE_LC_CTYPE] = "LC_CTYPE",
|
|
[VARIABLE_LC_NUMERIC] = "LC_NUMERIC",
|
|
[VARIABLE_LC_TIME] = "LC_TIME",
|
|
[VARIABLE_LC_COLLATE] = "LC_COLLATE",
|
|
[VARIABLE_LC_MONETARY] = "LC_MONETARY",
|
|
[VARIABLE_LC_MESSAGES] = "LC_MESSAGES",
|
|
[VARIABLE_LC_PAPER] = "LC_PAPER",
|
|
[VARIABLE_LC_NAME] = "LC_NAME",
|
|
[VARIABLE_LC_ADDRESS] = "LC_ADDRESS",
|
|
[VARIABLE_LC_TELEPHONE] = "LC_TELEPHONE",
|
|
[VARIABLE_LC_MEASUREMENT] = "LC_MEASUREMENT",
|
|
[VARIABLE_LC_IDENTIFICATION] = "LC_IDENTIFICATION"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(locale_variable, LocaleVariable);
|