TOMOYO: Allow wildcard for execute permission.
Some applications create and execute programs dynamically. We need to accept
wildcard for execute permission because such programs contain random suffix
in their filenames. This patch loosens up regulation of string parameters.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index 7b023f5..592b76a 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -89,7 +89,7 @@
bool tomoyo_parse_name_union(const char *filename,
struct tomoyo_name_union *ptr)
{
- if (!tomoyo_is_correct_path(filename, 0, 0, 0))
+ if (!tomoyo_is_correct_word(filename))
return false;
if (filename[0] == '@') {
ptr->group = tomoyo_get_path_group(filename + 1);
@@ -115,7 +115,7 @@
unsigned long v;
memset(num, 0, sizeof(*num));
if (data[0] == '@') {
- if (!tomoyo_is_correct_path(data, 0, 0, 0))
+ if (!tomoyo_is_correct_word(data))
return false;
num->group = tomoyo_get_number_group(data + 1);
num->is_group = true;
@@ -265,54 +265,29 @@
}
/**
- * tomoyo_is_correct_path - Validate a pathname.
+ * tomoyo_is_correct_word2 - Validate a string.
*
- * @filename: The pathname to check.
- * @start_type: Should the pathname start with '/'?
- * 1 = must / -1 = must not / 0 = don't care
- * @pattern_type: Can the pathname contain a wildcard?
- * 1 = must / -1 = must not / 0 = don't care
- * @end_type: Should the pathname end with '/'?
- * 1 = must / -1 = must not / 0 = don't care
+ * @string: The string to check. May be non-'\0'-terminated.
+ * @len: Length of @string.
*
- * Check whether the given filename follows the naming rules.
- * Returns true if @filename follows the naming rules, false otherwise.
+ * Check whether the given string follows the naming rules.
+ * Returns true if @string follows the naming rules, false otherwise.
*/
-bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
- const s8 pattern_type, const s8 end_type)
+static bool tomoyo_is_correct_word2(const char *string, size_t len)
{
- const char *const start = filename;
+ const char *const start = string;
bool in_repetition = false;
- bool contains_pattern = false;
unsigned char c;
unsigned char d;
unsigned char e;
-
- if (!filename)
+ if (!len)
goto out;
- c = *filename;
- if (start_type == 1) { /* Must start with '/' */
- if (c != '/')
- goto out;
- } else if (start_type == -1) { /* Must not start with '/' */
- if (c == '/')
- goto out;
- }
- if (c)
- c = *(filename + strlen(filename) - 1);
- if (end_type == 1) { /* Must end with '/' */
- if (c != '/')
- goto out;
- } else if (end_type == -1) { /* Must not end with '/' */
- if (c == '/')
- goto out;
- }
- while (1) {
- c = *filename++;
- if (!c)
- break;
+ while (len--) {
+ c = *string++;
if (c == '\\') {
- c = *filename++;
+ if (!len--)
+ goto out;
+ c = *string++;
switch (c) {
case '\\': /* "\\" */
continue;
@@ -326,21 +301,14 @@
case 'a': /* "\a" */
case 'A': /* "\A" */
case '-': /* "\-" */
- if (pattern_type == -1)
- break; /* Must not contain pattern */
- contains_pattern = true;
continue;
case '{': /* "/\{" */
- if (filename - 3 < start ||
- *(filename - 3) != '/')
+ if (string - 3 < start || *(string - 3) != '/')
break;
- if (pattern_type == -1)
- break; /* Must not contain pattern */
- contains_pattern = true;
in_repetition = true;
continue;
case '}': /* "\}/" */
- if (*filename != '/')
+ if (*string != '/')
break;
if (!in_repetition)
break;
@@ -350,11 +318,11 @@
case '1':
case '2':
case '3':
- d = *filename++;
- if (d < '0' || d > '7')
+ if (!len-- || !len--)
break;
- e = *filename++;
- if (e < '0' || e > '7')
+ d = *string++;
+ e = *string++;
+ if (d < '0' || d > '7' || e < '0' || e > '7')
break;
c = tomoyo_make_byte(c, d, e);
if (tomoyo_is_invalid(c))
@@ -367,10 +335,6 @@
goto out;
}
}
- if (pattern_type == 1) { /* Must contain pattern */
- if (!contains_pattern)
- goto out;
- }
if (in_repetition)
goto out;
return true;
@@ -379,58 +343,58 @@
}
/**
+ * tomoyo_is_correct_word - Validate a string.
+ *
+ * @string: The string to check.
+ *
+ * Check whether the given string follows the naming rules.
+ * Returns true if @string follows the naming rules, false otherwise.
+ */
+bool tomoyo_is_correct_word(const char *string)
+{
+ return tomoyo_is_correct_word2(string, strlen(string));
+}
+
+/**
+ * tomoyo_is_correct_path - Validate a pathname.
+ *
+ * @filename: The pathname to check.
+ *
+ * Check whether the given pathname follows the naming rules.
+ * Returns true if @filename follows the naming rules, false otherwise.
+ */
+bool tomoyo_is_correct_path(const char *filename)
+{
+ return *filename == '/' && tomoyo_is_correct_word(filename);
+}
+
+/**
* tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
*
- * @domainname: The domainname to check.
+ * @domainname: The domainname to check.
*
* Returns true if @domainname follows the naming rules, false otherwise.
*/
bool tomoyo_is_correct_domain(const unsigned char *domainname)
{
- unsigned char c;
- unsigned char d;
- unsigned char e;
-
if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
TOMOYO_ROOT_NAME_LEN))
goto out;
domainname += TOMOYO_ROOT_NAME_LEN;
if (!*domainname)
return true;
- do {
- if (*domainname++ != ' ')
+ if (*domainname++ != ' ')
+ goto out;
+ while (1) {
+ const unsigned char *cp = strchr(domainname, ' ');
+ if (!cp)
+ break;
+ if (*domainname != '/' ||
+ !tomoyo_is_correct_word2(domainname, cp - domainname - 1))
goto out;
- if (*domainname++ != '/')
- goto out;
- while ((c = *domainname) != '\0' && c != ' ') {
- domainname++;
- if (c == '\\') {
- c = *domainname++;
- switch ((c)) {
- case '\\': /* "\\" */
- continue;
- case '0': /* "\ooo" */
- case '1':
- case '2':
- case '3':
- d = *domainname++;
- if (d < '0' || d > '7')
- break;
- e = *domainname++;
- if (e < '0' || e > '7')
- break;
- c = tomoyo_make_byte(c, d, e);
- if (tomoyo_is_invalid(c))
- /* pattern is not \000 */
- continue;
- }
- goto out;
- } else if (tomoyo_is_invalid(c)) {
- goto out;
- }
- }
- } while (*domainname);
- return true;
+ domainname = cp + 1;
+ }
+ return tomoyo_is_correct_path(domainname);
out:
return false;
}