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locale: Remove private union from struct __locale_data

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This avoids an alias violation later.  This commit also fixes
an incorrect double-checked locking idiom in _nl_init_era_entries.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2022-05-23 10:08:18 +02:00
parent bbebe83a28
commit 7ee41feba6
18 changed files with 74 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
locale/C-address.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_ADDRESS attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
13,

2
locale/C-collate.c
View File

@ -25,7 +25,7 @@ const struct __locale_data _nl_C_LC_COLLATE attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
19,

2
locale/C-ctype.c
View File

@ -542,7 +542,7 @@ const struct __locale_data _nl_C_LC_CTYPE attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
1, /* Enable transliteration by default. */
NR_FIXED + NR_CLASSES + NR_MAPS,

2
locale/C-identification.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_IDENTIFICATION attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
16,

2
locale/C-measurement.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_MEASUREMENT attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
2,

2
locale/C-messages.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_MESSAGES attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
5,

2
locale/C-monetary.c
View File

@ -27,7 +27,7 @@ const struct __locale_data _nl_C_LC_MONETARY attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
46,

2
locale/C-name.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_NAME attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
7,

2
locale/C-numeric.c
View File

@ -23,7 +23,7 @@ const struct __locale_data _nl_C_LC_NUMERIC attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
6,

2
locale/C-paper.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_PAPER attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
3,

2
locale/C-telephone.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_TELEPHONE attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
5,

2
locale/C-time.c
View File

@ -26,7 +26,7 @@ const struct __locale_data _nl_C_LC_TIME attribute_hidden =
{
_nl_C_name,
NULL, 0, 0, /* no file mapped */
{ NULL, }, /* no cached data */
NULL, /* No cached data. */
UNDELETABLE,
0,
159,

14
locale/localeinfo.h
View File

@ -59,13 +59,13 @@ struct __locale_data
} alloc;
/* This provides a slot for category-specific code to cache data
computed about this locale. This is deallocated at the start of
_nl_unload_locale. */
union
{
struct lc_time_data *time;
const struct gconv_fcts *ctype;
} private;
computed about this locale. Type of the data pointed to:
LC_CTYPE struct gconv_fcts (get_gconv_fcts, __wcsmbs_load_conv)
LC_TIME struct lc_time_data (_nl_init_alt_digit, _nl_init_era_entries)
This data deallocated at the start of _nl_unload_locale. */
void *private;
unsigned int usage_count; /* Counter for users. */

47
time/alt_digit.c
View File

@ -30,19 +30,18 @@ __libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)
#define CURRENT_WSTR(item) \
((wchar_t *) current->values[_NL_ITEM_INDEX (item)].wstr)
static void
static struct lc_time_data *
_nl_init_alt_digit (struct __locale_data *current)
{
struct lc_time_data *data;
struct lc_time_data *data = current->private;
if (current->private.time == NULL)
if (data == NULL)
{
current->private.time = malloc (sizeof *current->private.time);
if (current->private.time == NULL)
return;
memset (current->private.time, 0, sizeof *current->private.time);
data = calloc (sizeof *data, 1);
if (data == NULL)
return NULL;
current->private = data;
}
data = current->private.time;
if (! data->alt_digits_initialized)
{
@ -65,6 +64,7 @@ _nl_init_alt_digit (struct __locale_data *current)
}
}
return data;
}
const char *
@ -77,13 +77,11 @@ _nl_get_alt_digit (unsigned int number, struct __locale_data *current)
__libc_rwlock_wrlock (__libc_setlocale_lock);
if (current->private.time == NULL
|| ! current->private.time->alt_digits_initialized)
_nl_init_alt_digit (current);
struct lc_time_data *data = _nl_init_alt_digit (current);
result = ((current->private.time != NULL
&& current->private.time->alt_digits != NULL)
? current->private.time->alt_digits[number]
result = ((data != NULL
&& data->alt_digits != NULL)
? data->alt_digits[number]
: NULL);
__libc_rwlock_unlock (__libc_setlocale_lock);
@ -96,21 +94,20 @@ const wchar_t *
_nl_get_walt_digit (unsigned int number, struct __locale_data *current)
{
const wchar_t *result = NULL;
struct lc_time_data *data;
if (number >= 100 || CURRENT_WSTR (_NL_WALT_DIGITS)[0] == L'\0')
return NULL;
__libc_rwlock_wrlock (__libc_setlocale_lock);
if (current->private.time == NULL)
struct lc_time_data *data = current->private;
if (data == NULL)
{
current->private.time = malloc (sizeof *current->private.time);
if (current->private.time == NULL)
data = calloc (sizeof *data, 1);
if (data == NULL)
goto out;
memset (current->private.time, 0, sizeof *current->private.time);
current->private = data;
}
data = current->private.time;
if (! data->walt_digits_initialized)
{
@ -156,12 +153,8 @@ _nl_parse_alt_digit (const char **strp, struct __locale_data *current)
__libc_rwlock_wrlock (__libc_setlocale_lock);
if (current->private.time == NULL
|| ! current->private.time->alt_digits_initialized)
_nl_init_alt_digit (current);
if (current->private.time != NULL
&& current->private.time->alt_digits != NULL)
struct lc_time_data *data = _nl_init_alt_digit (current);
if (data != NULL && data->alt_digits != NULL)
/* Matching is not unambiguous. The alternative digits could be like
I, II, III, ... and the first one is a substring of the second
and third. Therefore we must keep on searching until we found
@ -169,7 +162,7 @@ _nl_parse_alt_digit (const char **strp, struct __locale_data *current)
the standard. */
for (cnt = 0; cnt < 100; ++cnt)
{
const char *const dig = current->private.time->alt_digits[cnt];
const char *const dig = data->alt_digits[cnt];
size_t len = strlen (dig);
if (len > maxlen && strncmp (dig, str, len) == 0)

48
time/era.c
View File

@ -35,7 +35,7 @@ __libc_rwlock_define (extern, __libc_setlocale_lock attribute_hidden)
/* Look up the era information in CURRENT's locale strings and
cache it in CURRENT->private. */
static void
static struct lc_time_data *
_nl_init_era_entries (struct __locale_data *current)
{
size_t cnt;
@ -43,18 +43,22 @@ _nl_init_era_entries (struct __locale_data *current)
/* Avoid touching CURRENT if there is no data at all, for _nl_C_LC_TIME. */
if (CURRENT_WORD (_NL_TIME_ERA_NUM_ENTRIES) == 0)
return;
return NULL;
data = current->private;
if (data != NULL && atomic_load_acquire (&data->era_initialized))
return data;
__libc_rwlock_wrlock (__libc_setlocale_lock);
if (current->private.time == NULL)
data = current->private;
if (data == NULL)
{
current->private.time = malloc (sizeof *current->private.time);
if (current->private.time == NULL)
data = calloc (sizeof *data, 1);
if (data == NULL)
goto out;
memset (current->private.time, 0, sizeof *current->private.time);
current->private = data;
}
data = current->private.time;
if (! data->era_initialized)
{
@ -130,33 +134,30 @@ _nl_init_era_entries (struct __locale_data *current)
}
}
data->era_initialized = 1;
atomic_store_release (&data->era_initialized, 1);
}
out:
__libc_rwlock_unlock (__libc_setlocale_lock);
return data;
}
struct era_entry *
_nl_get_era_entry (const struct tm *tp, struct __locale_data *current)
{
if (current->private.time == NULL || !current->private.time->era_initialized)
_nl_init_era_entries (current);
struct lc_time_data *data = _nl_init_era_entries (current);
if (current->private.time != NULL)
if (data != NULL)
{
/* Now compare date with the available eras. */
const int32_t tdate[3] = { tp->tm_year, tp->tm_mon, tp->tm_mday };
size_t cnt;
for (cnt = 0; cnt < current->private.time->num_eras; ++cnt)
if ((ERA_DATE_CMP (current->private.time->eras[cnt].start_date, tdate)
&& ERA_DATE_CMP (tdate,
current->private.time->eras[cnt].stop_date))
|| (ERA_DATE_CMP (current->private.time->eras[cnt].stop_date,
tdate)
&& ERA_DATE_CMP (tdate,
current->private.time->eras[cnt].start_date)))
return &current->private.time->eras[cnt];
for (cnt = 0; cnt < data->num_eras; ++cnt)
if ((ERA_DATE_CMP (data->eras[cnt].start_date, tdate)
&& ERA_DATE_CMP (tdate, data->eras[cnt].stop_date))
|| (ERA_DATE_CMP (data->eras[cnt].stop_date, tdate)
&& ERA_DATE_CMP (tdate, data->eras[cnt].start_date)))
return &data->eras[cnt];
}
return NULL;
@ -166,9 +167,6 @@ _nl_get_era_entry (const struct tm *tp, struct __locale_data *current)
struct era_entry *
_nl_select_era_entry (int cnt, struct __locale_data *current)
{
if (current->private.time == NULL || !current->private.time->era_initialized)
_nl_init_era_entries (current);
return (current->private.time == NULL
? NULL : &current->private.time->eras[cnt]);
struct lc_time_data *data = _nl_init_era_entries (current);
return data == NULL ? NULL : &data->eras[cnt];
}

4
time/lc-time-cleanup.c
View File

@ -22,10 +22,10 @@
void
_nl_cleanup_time (struct __locale_data *locale)
{
struct lc_time_data *const data = locale->private.time;
struct lc_time_data *const data = locale->private;
if (data != NULL)
{
locale->private.time = NULL;
locale->private = NULL;
free (data->eras);
free (data->alt_digits);

10
wcsmbs/wcsmbsload.c
View File

@ -155,7 +155,7 @@ __wcsmbs_load_conv (struct __locale_data *new_category)
/* We should repeat the test since while we waited some other thread
might have run this function. */
if (__glibc_likely (new_category->private.ctype == NULL))
if (__glibc_likely (new_category->private == NULL))
{
/* We must find the real functions. */
const char *charset_name;
@ -199,10 +199,10 @@ __wcsmbs_load_conv (struct __locale_data *new_category)
free (new_fcts);
failed:
new_category->private.ctype = &__wcsmbs_gconv_fcts_c;
new_category->private = (void *) &__wcsmbs_gconv_fcts_c;
}
else
new_category->private.ctype = new_fcts;
new_category->private = new_fcts;
}
__libc_rwlock_unlock (__libc_setlocale_lock);
@ -263,10 +263,10 @@ __wcsmbs_named_conv (struct gconv_fcts *copy, const char *name)
void
_nl_cleanup_ctype (struct __locale_data *locale)
{
const struct gconv_fcts *const data = locale->private.ctype;
const struct gconv_fcts *const data = locale->private;
if (data != NULL && data != &__wcsmbs_gconv_fcts_c)
{
locale->private.ctype = NULL;
locale->private = NULL;
/* Free the old conversions. */
__gconv_close_transform (data->tomb, data->tomb_nsteps);

8
wcsmbs/wcsmbsload.h
View File

@ -66,13 +66,15 @@ extern const struct __locale_data _nl_C_LC_CTYPE attribute_hidden;
static inline const struct gconv_fcts *
get_gconv_fcts (struct __locale_data *data)
{
if (__glibc_unlikely (data->private.ctype == NULL))
struct gconv_fcts *private = data->private;
if (private == NULL)
{
if (__glibc_unlikely (data == &_nl_C_LC_CTYPE))
if (data == &_nl_C_LC_CTYPE)
return &__wcsmbs_gconv_fcts_c;
__wcsmbs_load_conv (data);
private = data->private;
}
return data->private.ctype;
return private;
}
#endif /* wcsmbsload.h */