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unicode: introduce test module for normalized utf8 implementation

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This implements a in-kernel sanity test module for the utf8
normalization core.  At probe time, it will run basic sequences through
the utf8n core, to identify problems will equivalent sequences and
normalization/casefold code.  This is supposed to be useful for
regression testing when adding support for a new version of utf8 to
linux.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Gabriel Krisman Bertazi 2019-04-25 13:56:01 -04:00 committed by Theodore Ts'o
parent 9d53690f0d
commit f0d6cc0032
3 changed files with 326 additions and 0 deletions
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5
fs/unicode/Kconfig
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@ -6,3 +6,8 @@ config UNICODE
help
Say Y here to enable UTF-8 NFD normalization and NFD+CF casefolding
support.
config UNICODE_NORMALIZATION_SELFTEST
tristate "Test UTF-8 normalization support"
depends on UNICODE
default n

1
fs/unicode/Makefile
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@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_UNICODE) += unicode.o
obj-$(CONFIG_UNICODE_NORMALIZATION_SELFTEST) += utf8-selftest.o
unicode-y := utf8-norm.o utf8-core.o

320
fs/unicode/utf8-selftest.c Normal file
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@ -0,0 +1,320 @@
/*
* Kernel module for testing utf-8 support.
*
* Copyright 2017 Collabora Ltd.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program 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 General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/unicode.h>
#include <linux/dcache.h>
#include "utf8n.h"
unsigned int failed_tests;
unsigned int total_tests;
/* Tests will be based on this version. */
#define latest_maj 11
#define latest_min 0
#define latest_rev 0
#define _test(cond, func, line, fmt, ...) do { \
total_tests++; \
if (!cond) { \
failed_tests++; \
pr_err("test %s:%d Failed: %s%s", \
func, line, #cond, (fmt?":":".")); \
if (fmt) \
pr_err(fmt, ##__VA_ARGS__); \
} \
} while (0)
#define test_f(cond, fmt, ...) _test(cond, __func__, __LINE__, fmt, ##__VA_ARGS__)
#define test(cond) _test(cond, __func__, __LINE__, "")
const static struct {
/* UTF-8 strings in this vector _must_ be NULL-terminated. */
unsigned char str[10];
unsigned char dec[10];
} nfdi_test_data[] = {
/* Trivial sequence */
{
/* "ABba" decomposes to itself */
.str = "aBba",
.dec = "aBba",
},
/* Simple equivalent sequences */
{
/* 'VULGAR FRACTION ONE QUARTER' cannot decompose to
'NUMBER 1' + 'FRACTION SLASH' + 'NUMBER 4' on
canonical decomposition */
.str = {0xc2, 0xbc, 0x00},
.dec = {0xc2, 0xbc, 0x00},
},
{
/* 'LATIN SMALL LETTER A WITH DIAERESIS' decomposes to
'LETTER A' + 'COMBINING DIAERESIS' */
.str = {0xc3, 0xa4, 0x00},
.dec = {0x61, 0xcc, 0x88, 0x00},
},
{
/* 'LATIN SMALL LETTER LJ' can't decompose to
'LETTER L' + 'LETTER J' on canonical decomposition */
.str = {0xC7, 0x89, 0x00},
.dec = {0xC7, 0x89, 0x00},
},
{
/* GREEK ANO TELEIA decomposes to MIDDLE DOT */
.str = {0xCE, 0x87, 0x00},
.dec = {0xC2, 0xB7, 0x00}
},
/* Canonical ordering */
{
/* A + 'COMBINING ACUTE ACCENT' + 'COMBINING OGONEK' decomposes
to A + 'COMBINING OGONEK' + 'COMBINING ACUTE ACCENT' */
.str = {0x41, 0xcc, 0x81, 0xcc, 0xa8, 0x0},
.dec = {0x41, 0xcc, 0xa8, 0xcc, 0x81, 0x0},
},
{
/* 'LATIN SMALL LETTER A WITH DIAERESIS' + 'COMBINING OGONEK'
decomposes to
'LETTER A' + 'COMBINING OGONEK' + 'COMBINING DIAERESIS' */
.str = {0xc3, 0xa4, 0xCC, 0xA8, 0x00},
.dec = {0x61, 0xCC, 0xA8, 0xcc, 0x88, 0x00},
},
};
const static struct {
/* UTF-8 strings in this vector _must_ be NULL-terminated. */
unsigned char str[30];
unsigned char ncf[30];
} nfdicf_test_data[] = {
/* Trivial sequences */
{
/* "ABba" folds to lowercase */
.str = {0x41, 0x42, 0x62, 0x61, 0x00},
.ncf = {0x61, 0x62, 0x62, 0x61, 0x00},
},
{
/* All ASCII folds to lower-case */
.str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0.1",
.ncf = "abcdefghijklmnopqrstuvwxyz0.1",
},
{
/* LATIN SMALL LETTER SHARP S folds to
LATIN SMALL LETTER S + LATIN SMALL LETTER S */
.str = {0xc3, 0x9f, 0x00},
.ncf = {0x73, 0x73, 0x00},
},
{
/* LATIN CAPITAL LETTER A WITH RING ABOVE folds to
LATIN SMALL LETTER A + COMBINING RING ABOVE */
.str = {0xC3, 0x85, 0x00},
.ncf = {0x61, 0xcc, 0x8a, 0x00},
},
/* Introduced by UTF-8.0.0. */
/* Cherokee letters are interesting test-cases because they fold
to upper-case. Before 8.0.0, Cherokee lowercase were
undefined, thus, the folding from LC is not stable between
7.0.0 -> 8.0.0, but it is from UC. */
{
/* CHEROKEE SMALL LETTER A folds to CHEROKEE LETTER A */
.str = {0xea, 0xad, 0xb0, 0x00},
.ncf = {0xe1, 0x8e, 0xa0, 0x00},
},
{
/* CHEROKEE SMALL LETTER YE folds to CHEROKEE LETTER YE */
.str = {0xe1, 0x8f, 0xb8, 0x00},
.ncf = {0xe1, 0x8f, 0xb0, 0x00},
},
{
/* OLD HUNGARIAN CAPITAL LETTER AMB folds to
OLD HUNGARIAN SMALL LETTER AMB */
.str = {0xf0, 0x90, 0xb2, 0x83, 0x00},
.ncf = {0xf0, 0x90, 0xb3, 0x83, 0x00},
},
/* Introduced by UTF-9.0.0. */
{
/* OSAGE CAPITAL LETTER CHA folds to
OSAGE SMALL LETTER CHA */
.str = {0xf0, 0x90, 0x92, 0xb5, 0x00},
.ncf = {0xf0, 0x90, 0x93, 0x9d, 0x00},
},
{
/* LATIN CAPITAL LETTER SMALL CAPITAL I folds to
LATIN LETTER SMALL CAPITAL I */
.str = {0xea, 0x9e, 0xae, 0x00},
.ncf = {0xc9, 0xaa, 0x00},
},
/* Introduced by UTF-11.0.0. */
{
/* GEORGIAN SMALL LETTER AN folds to GEORGIAN MTAVRULI
CAPITAL LETTER AN */
.str = {0xe1, 0xb2, 0x90, 0x00},
.ncf = {0xe1, 0x83, 0x90, 0x00},
}
};
static void check_utf8_nfdi(void)
{
int i;
struct utf8cursor u8c;
const struct utf8data *data;
data = utf8nfdi(UNICODE_AGE(latest_maj, latest_min, latest_rev));
if (!data) {
pr_err("%s: Unable to load utf8-%d.%d.%d. Skipping.\n",
__func__, latest_maj, latest_min, latest_rev);
return;
}
for (i = 0; i < ARRAY_SIZE(nfdi_test_data); i++) {
int len = strlen(nfdi_test_data[i].str);
int nlen = strlen(nfdi_test_data[i].dec);
int j = 0;
unsigned char c;
test((utf8len(data, nfdi_test_data[i].str) == nlen));
test((utf8nlen(data, nfdi_test_data[i].str, len) == nlen));
if (utf8cursor(&u8c, data, nfdi_test_data[i].str) < 0)
pr_err("can't create cursor\n");
while ((c = utf8byte(&u8c)) > 0) {
test_f((c == nfdi_test_data[i].dec[j]),
"Unexpected byte 0x%x should be 0x%x\n",
c, nfdi_test_data[i].dec[j]);
j++;
}
test((j == nlen));
}
}
static void check_utf8_nfdicf(void)
{
int i;
struct utf8cursor u8c;
const struct utf8data *data;
data = utf8nfdicf(UNICODE_AGE(latest_maj, latest_min, latest_rev));
if (!data) {
pr_err("%s: Unable to load utf8-%d.%d.%d. Skipping.\n",
__func__, latest_maj, latest_min, latest_rev);
return;
}
for (i = 0; i < ARRAY_SIZE(nfdicf_test_data); i++) {
int len = strlen(nfdicf_test_data[i].str);
int nlen = strlen(nfdicf_test_data[i].ncf);
int j = 0;
unsigned char c;
test((utf8len(data, nfdicf_test_data[i].str) == nlen));
test((utf8nlen(data, nfdicf_test_data[i].str, len) == nlen));
if (utf8cursor(&u8c, data, nfdicf_test_data[i].str) < 0)
pr_err("can't create cursor\n");
while ((c = utf8byte(&u8c)) > 0) {
test_f((c == nfdicf_test_data[i].ncf[j]),
"Unexpected byte 0x%x should be 0x%x\n",
c, nfdicf_test_data[i].ncf[j]);
j++;
}
test((j == nlen));
}
}
static void check_utf8_comparisons(void)
{
int i;
struct unicode_map *table = utf8_load("11.0.0");
if (IS_ERR(table)) {
pr_err("%s: Unable to load utf8 %d.%d.%d. Skipping.\n",
__func__, latest_maj, latest_min, latest_rev);
return;
}
for (i = 0; i < ARRAY_SIZE(nfdi_test_data); i++) {
const struct qstr s1 = {.name = nfdi_test_data[i].str,
.len = sizeof(nfdi_test_data[i].str)};
const struct qstr s2 = {.name = nfdi_test_data[i].dec,
.len = sizeof(nfdi_test_data[i].dec)};
test_f(!utf8_strncmp(table, &s1, &s2),
"%s %s comparison mismatch\n", s1.name, s2.name);
}
for (i = 0; i < ARRAY_SIZE(nfdicf_test_data); i++) {
const struct qstr s1 = {.name = nfdicf_test_data[i].str,
.len = sizeof(nfdicf_test_data[i].str)};
const struct qstr s2 = {.name = nfdicf_test_data[i].ncf,
.len = sizeof(nfdicf_test_data[i].ncf)};
test_f(!utf8_strncasecmp(table, &s1, &s2),
"%s %s comparison mismatch\n", s1.name, s2.name);
}
utf8_unload(table);
}
static void check_supported_versions(void)
{
/* Unicode 7.0.0 should be supported. */
test(utf8version_is_supported(7, 0, 0));
/* Unicode 9.0.0 should be supported. */
test(utf8version_is_supported(9, 0, 0));
/* Unicode 1x.0.0 (the latest version) should be supported. */
test(utf8version_is_supported(latest_maj, latest_min, latest_rev));
/* Next versions don't exist. */
test(!utf8version_is_supported(12, 0, 0));
test(!utf8version_is_supported(0, 0, 0));
test(!utf8version_is_supported(-1, -1, -1));
}
static int __init init_test_ucd(void)
{
failed_tests = 0;
total_tests = 0;
check_supported_versions();
check_utf8_nfdi();
check_utf8_nfdicf();
check_utf8_comparisons();
if (!failed_tests)
pr_info("All %u tests passed\n", total_tests);
else
pr_err("%u out of %u tests failed\n", failed_tests,
total_tests);
return 0;
}
static void __exit exit_test_ucd(void)
{
}
module_init(init_test_ucd);
module_exit(exit_test_ucd);
MODULE_AUTHOR("Gabriel Krisman Bertazi <krisman@collabora.co.uk>");
MODULE_LICENSE("GPL");