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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-05-17 10:06:58 +0900
committerJames Morris <jmorris@namei.org>2010-08-02 15:33:35 +1000
commit4c3e9e2ded48bcf696a45945ea7d25bb15b873fd (patch)
tree0be326f0f90b0279ae83594e9244c3739d348df1 /security/tomoyo/common.c
parentbabcd37821fba57048b30151969d28303f2a8b6b (diff)
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TOMOYO: Add numeric values grouping support.
This patch adds numeric values grouping support, which is useful for grouping numeric values such as file's UID, DAC's mode, ioctl()'s cmd number. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/common.c')
-rw-r--r--security/tomoyo/common.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index b5dbdc9ff73..d82c2978b1b 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -119,6 +119,159 @@ static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
}
/**
+ * tomoyo_parse_ulong - Parse an "unsigned long" value.
+ *
+ * @result: Pointer to "unsigned long".
+ * @str: Pointer to string to parse.
+ *
+ * Returns value type on success, 0 otherwise.
+ *
+ * The @src is updated to point the first character after the value
+ * on success.
+ */
+u8 tomoyo_parse_ulong(unsigned long *result, char **str)
+{
+ const char *cp = *str;
+ char *ep;
+ int base = 10;
+ if (*cp == '0') {
+ char c = *(cp + 1);
+ if (c == 'x' || c == 'X') {
+ base = 16;
+ cp += 2;
+ } else if (c >= '0' && c <= '7') {
+ base = 8;
+ cp++;
+ }
+ }
+ *result = simple_strtoul(cp, &ep, base);
+ if (cp == ep)
+ return 0;
+ *str = ep;
+ switch (base) {
+ case 16:
+ return TOMOYO_VALUE_TYPE_HEXADECIMAL;
+ case 8:
+ return TOMOYO_VALUE_TYPE_OCTAL;
+ default:
+ return TOMOYO_VALUE_TYPE_DECIMAL;
+ }
+}
+
+/**
+ * tomoyo_print_ulong - Print an "unsigned long" value.
+ *
+ * @buffer: Pointer to buffer.
+ * @buffer_len: Size of @buffer.
+ * @value: An "unsigned long" value.
+ * @type: Type of @value.
+ *
+ * Returns nothing.
+ */
+void tomoyo_print_ulong(char *buffer, const int buffer_len,
+ const unsigned long value, const u8 type)
+{
+ if (type == TOMOYO_VALUE_TYPE_DECIMAL)
+ snprintf(buffer, buffer_len, "%lu", value);
+ else if (type == TOMOYO_VALUE_TYPE_OCTAL)
+ snprintf(buffer, buffer_len, "0%lo", value);
+ else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
+ snprintf(buffer, buffer_len, "0x%lX", value);
+ else
+ snprintf(buffer, buffer_len, "type(%u)", type);
+}
+
+/**
+ * tomoyo_print_number_union - Print a tomoyo_number_union.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
+ const struct tomoyo_number_union *ptr)
+{
+ unsigned long min;
+ unsigned long max;
+ u8 min_type;
+ u8 max_type;
+ if (!tomoyo_io_printf(head, " "))
+ return false;
+ if (ptr->is_group)
+ return tomoyo_io_printf(head, "@%s",
+ ptr->group->group_name->name);
+ min_type = ptr->min_type;
+ max_type = ptr->max_type;
+ min = ptr->values[0];
+ max = ptr->values[1];
+ switch (min_type) {
+ case TOMOYO_VALUE_TYPE_HEXADECIMAL:
+ if (!tomoyo_io_printf(head, "0x%lX", min))
+ return false;
+ break;
+ case TOMOYO_VALUE_TYPE_OCTAL:
+ if (!tomoyo_io_printf(head, "0%lo", min))
+ return false;
+ break;
+ default:
+ if (!tomoyo_io_printf(head, "%lu", min))
+ return false;
+ break;
+ }
+ if (min == max && min_type == max_type)
+ return true;
+ switch (max_type) {
+ case TOMOYO_VALUE_TYPE_HEXADECIMAL:
+ return tomoyo_io_printf(head, "-0x%lX", max);
+ case TOMOYO_VALUE_TYPE_OCTAL:
+ return tomoyo_io_printf(head, "-0%lo", max);
+ default:
+ return tomoyo_io_printf(head, "-%lu", max);
+ }
+}
+
+/**
+ * tomoyo_parse_number_union - Parse a tomoyo_number_union.
+ *
+ * @data: Number or number range or number group.
+ * @ptr: Pointer to "struct tomoyo_number_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
+{
+ u8 type;
+ unsigned long v;
+ memset(num, 0, sizeof(*num));
+ if (data[0] == '@') {
+ if (!tomoyo_is_correct_path(data, 0, 0, 0))
+ return false;
+ num->group = tomoyo_get_number_group(data + 1);
+ num->is_group = true;
+ return num->group != NULL;
+ }
+ type = tomoyo_parse_ulong(&v, &data);
+ if (!type)
+ return false;
+ num->values[0] = v;
+ num->min_type = type;
+ if (!*data) {
+ num->values[1] = v;
+ num->max_type = type;
+ return true;
+ }
+ if (*data++ != '-')
+ return false;
+ type = tomoyo_parse_ulong(&v, &data);
+ if (!type || *data)
+ return false;
+ num->values[1] = v;
+ num->max_type = type;
+ return true;
+}
+
+/**
* tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
*
* @str: Pointer to the string.
@@ -1750,6 +1903,8 @@ static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
return tomoyo_write_no_rewrite_policy(data, is_delete);
if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
return tomoyo_write_path_group_policy(data, is_delete);
+ if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
+ return tomoyo_write_number_group_policy(data, is_delete);
return -EINVAL;
}
@@ -1812,6 +1967,12 @@ static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
head->read_var2 = NULL;
head->read_step = 10;
case 10:
+ if (!tomoyo_read_number_group_policy(head))
+ break;
+ head->read_var1 = NULL;
+ head->read_var2 = NULL;
+ head->read_step = 11;
+ case 11:
head->read_eof = true;
break;
default: