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Fix buffer overread in string-locale<?

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* libguile/i18n.c (compare_strings): In all cases, convert to a
null-terminated string.  While we're doing that, might as well use
utf-8.
* test-suite/tests/i18n.test ("text collation (French)"): Add test.

Thanks again to Rob Browning for the report.
This commit is contained in:
Andy Wingo 2021-03-15 22:02:12 +01:00
parent 8a8727db5c
commit 72bf9d93ca
2 changed files with 25 additions and 23 deletions
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41
libguile/i18n.c
View file

@ -788,34 +788,29 @@ SCM_DEFINE (scm_locale_p, "locale?", 1, 0, 0,
} while (0)
/* Compare UTF-32 strings according to LOCALE. Returns a negative value if
S1 compares smaller than S2, a positive value if S1 compares larger than
/* Compare strings according to LOCALE. Returns a negative value if S1
compares smaller than S2, a positive value if S1 compares larger than
S2, or 0 if they compare equal. */
static inline int
compare_u32_strings (SCM s1, SCM s2, SCM locale, const char *func_name)
compare_strings (SCM s1, SCM s2, SCM locale, const char *func_name)
#define FUNC_NAME func_name
{
int result;
scm_t_locale c_locale;
scm_t_wchar *c_s1, *c_s2;
int c_s1_malloc_p, c_s2_malloc_p;
uint8_t *c_s1, *c_s2;
SCM_VALIDATE_OPTIONAL_LOCALE_COPY (3, locale, c_locale);
SCM_STRING_TO_U32_BUF (s1, c_s1, c_s1_malloc_p);
SCM_STRING_TO_U32_BUF (s2, c_s2, c_s2_malloc_p);
c_s1 = (uint8_t *) scm_to_utf8_string (s1);
c_s2 = (uint8_t *) scm_to_utf8_string (s2);
if (c_locale)
RUN_IN_LOCALE_SECTION (c_locale,
result = u32_strcoll ((const uint32_t *) c_s1,
(const uint32_t *) c_s2));
RUN_IN_LOCALE_SECTION (c_locale, result = u8_strcoll (c_s1, c_s2));
else
result = u32_strcoll ((const uint32_t *) c_s1,
(const uint32_t *) c_s2);
result = u8_strcoll (c_s1, c_s2);
SCM_CLEANUP_U32_BUF(c_s1, c_s1_malloc_p);
SCM_CLEANUP_U32_BUF(c_s2, c_s2_malloc_p);
free (c_s1);
free (c_s2);
scm_remember_upto_here_2 (s1, s2);
scm_remember_upto_here (locale);
return result;
}
@ -907,7 +902,7 @@ SCM_DEFINE (scm_string_locale_lt, "string-locale<?", 2, 1, 0,
SCM_VALIDATE_STRING (1, s1);
SCM_VALIDATE_STRING (2, s2);
result = compare_u32_strings (s1, s2, locale, FUNC_NAME);
result = compare_strings (s1, s2, locale, FUNC_NAME);
return scm_from_bool (result < 0);
}
@ -926,7 +921,7 @@ SCM_DEFINE (scm_string_locale_gt, "string-locale>?", 2, 1, 0,
SCM_VALIDATE_STRING (1, s1);
SCM_VALIDATE_STRING (2, s2);
result = compare_u32_strings (s1, s2, locale, FUNC_NAME);
result = compare_strings (s1, s2, locale, FUNC_NAME);
return scm_from_bool (result > 0);
}
@ -1004,9 +999,9 @@ SCM_DEFINE (scm_char_locale_lt, "char-locale<?", 2, 1, 0,
SCM_VALIDATE_CHAR (1, c1);
SCM_VALIDATE_CHAR (2, c2);
result = compare_u32_strings (scm_string (scm_list_1 (c1)),
scm_string (scm_list_1 (c2)),
locale, FUNC_NAME);
result = compare_strings (scm_string (scm_list_1 (c1)),
scm_string (scm_list_1 (c2)),
locale, FUNC_NAME);
return scm_from_bool (result < 0);
}
@ -1023,9 +1018,9 @@ SCM_DEFINE (scm_char_locale_gt, "char-locale>?", 2, 1, 0,
SCM_VALIDATE_CHAR (1, c1);
SCM_VALIDATE_CHAR (2, c2);
result = compare_u32_strings (scm_string (scm_list_1 (c1)),
scm_string (scm_list_1 (c2)),
locale, FUNC_NAME);
result = compare_strings (scm_string (scm_list_1 (c1)),
scm_string (scm_list_1 (c2)),
locale, FUNC_NAME);
return scm_from_bool (result > 0);
}

7
test-suite/tests/i18n.test
View file

@ -221,6 +221,13 @@
(lambda ()
(setlocale LC_ALL "C"))))))
(pass-if "string-locale<?, bis"
(under-french-utf8-locale-or-unresolved
(lambda ()
(let* ((strings (list "œa" "œb"))
(heads (map (lambda (s) (substring/shared s 0 1)) strings)))
(not (apply string-locale<? heads))))))
(pass-if "string-locale-ci=?, bis"
(under-french-utf8-locale-or-unresolved
(lambda ()