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Diffstat (limited to 'security/tomoyo/condition.c')
-rw-r--r--security/tomoyo/condition.c116
1 files changed, 112 insertions, 4 deletions
diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c
index ac7ebeb47d7d..790b9872cc37 100644
--- a/security/tomoyo/condition.c
+++ b/security/tomoyo/condition.c
@@ -11,6 +11,68 @@
LIST_HEAD(tomoyo_condition_list);
/**
+ * tomoyo_scan_exec_realpath - Check "exec.realpath" parameter of "struct tomoyo_condition".
+ *
+ * @file: Pointer to "struct file".
+ * @ptr: Pointer to "struct tomoyo_name_union".
+ * @match: True if "exec.realpath=", false if "exec.realpath!=".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_scan_exec_realpath(struct file *file,
+ const struct tomoyo_name_union *ptr,
+ const bool match)
+{
+ bool result;
+ struct tomoyo_path_info exe;
+ if (!file)
+ return false;
+ exe.name = tomoyo_realpath_from_path(&file->f_path);
+ if (!exe.name)
+ return false;
+ tomoyo_fill_path_info(&exe);
+ result = tomoyo_compare_name_union(&exe, ptr);
+ kfree(exe.name);
+ return result == match;
+}
+
+/**
+ * tomoyo_get_dqword - tomoyo_get_name() for a quoted string.
+ *
+ * @start: String to save.
+ *
+ * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
+ */
+static const struct tomoyo_path_info *tomoyo_get_dqword(char *start)
+{
+ char *cp = start + strlen(start) - 1;
+ if (cp == start || *start++ != '"' || *cp != '"')
+ return NULL;
+ *cp = '\0';
+ if (*start && !tomoyo_correct_word(start))
+ return NULL;
+ return tomoyo_get_name(start);
+}
+
+/**
+ * tomoyo_parse_name_union_quoted - Parse a quoted word.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ * @ptr: Pointer to "struct tomoyo_name_union".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_parse_name_union_quoted(struct tomoyo_acl_param *param,
+ struct tomoyo_name_union *ptr)
+{
+ char *filename = param->data;
+ if (*filename == '@')
+ return tomoyo_parse_name_union(param, ptr);
+ ptr->filename = tomoyo_get_dqword(filename);
+ return ptr->filename != NULL;
+}
+
+/**
* tomoyo_same_condition - Check for duplicated "struct tomoyo_condition" entry.
*
* @a: Pointer to "struct tomoyo_condition".
@@ -23,6 +85,7 @@ static inline bool tomoyo_same_condition(const struct tomoyo_condition *a,
{
return a->size == b->size && a->condc == b->condc &&
a->numbers_count == b->numbers_count &&
+ a->names_count == b->names_count &&
!memcmp(a + 1, b + 1, a->size - sizeof(*a));
}
@@ -114,6 +177,7 @@ struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param)
struct tomoyo_condition *entry = NULL;
struct tomoyo_condition_element *condp = NULL;
struct tomoyo_number_union *numbers_p = NULL;
+ struct tomoyo_name_union *names_p = NULL;
struct tomoyo_condition e = { };
char * const start_of_string = param->data;
char * const end_of_string = start_of_string + strlen(start_of_string);
@@ -178,6 +242,20 @@ rerun:
e.condc++;
else
e.condc--;
+ if (left == TOMOYO_EXEC_REALPATH ||
+ left == TOMOYO_SYMLINK_TARGET) {
+ if (!names_p) {
+ e.names_count++;
+ } else {
+ e.names_count--;
+ right = TOMOYO_NAME_UNION;
+ param->data = right_word;
+ if (!tomoyo_parse_name_union_quoted(param,
+ names_p++))
+ goto out;
+ }
+ goto store_value;
+ }
right = tomoyo_condition_type(right_word);
if (right == TOMOYO_MAX_CONDITION_KEYWORD) {
if (!numbers_p) {
@@ -191,6 +269,7 @@ rerun:
goto out;
}
}
+store_value:
if (!condp) {
dprintk(KERN_WARNING "%u: dry_run left=%u right=%u "
"match=%u\n", __LINE__, left, right, !is_not);
@@ -204,21 +283,23 @@ rerun:
condp->equals);
condp++;
}
- dprintk(KERN_INFO "%u: cond=%u numbers=%u\n",
- __LINE__, e.condc, e.numbers_count);
+ dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u\n",
+ __LINE__, e.condc, e.numbers_count, e.names_count);
if (entry) {
- BUG_ON(e.numbers_count | e.condc);
+ BUG_ON(e.names_count | e.numbers_count | e.condc);
return tomoyo_commit_condition(entry);
}
e.size = sizeof(*entry)
+ e.condc * sizeof(struct tomoyo_condition_element)
- + e.numbers_count * sizeof(struct tomoyo_number_union);
+ + e.numbers_count * sizeof(struct tomoyo_number_union)
+ + e.names_count * sizeof(struct tomoyo_name_union);
entry = kzalloc(e.size, GFP_NOFS);
if (!entry)
return NULL;
*entry = e;
condp = (struct tomoyo_condition_element *) (entry + 1);
numbers_p = (struct tomoyo_number_union *) (condp + e.condc);
+ names_p = (struct tomoyo_name_union *) (numbers_p + e.numbers_count);
{
bool flag = false;
for (pos = start_of_string; pos < end_of_string; pos++) {
@@ -309,6 +390,7 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
unsigned long max_v[2] = { 0, 0 };
const struct tomoyo_condition_element *condp;
const struct tomoyo_number_union *numbers_p;
+ const struct tomoyo_name_union *names_p;
struct tomoyo_obj_info *obj;
u16 condc;
if (!cond)
@@ -317,6 +399,8 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
obj = r->obj;
condp = (struct tomoyo_condition_element *) (cond + 1);
numbers_p = (const struct tomoyo_number_union *) (condp + condc);
+ names_p = (const struct tomoyo_name_union *)
+ (numbers_p + cond->numbers_count);
for (i = 0; i < condc; i++) {
const bool match = condp->equals;
const u8 left = condp->left;
@@ -324,6 +408,30 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
bool is_bitop[2] = { false, false };
u8 j;
condp++;
+ /* Check string expressions. */
+ if (right == TOMOYO_NAME_UNION) {
+ const struct tomoyo_name_union *ptr = names_p++;
+ switch (left) {
+ struct tomoyo_path_info *symlink;
+ struct tomoyo_execve *ee;
+ struct file *file;
+ case TOMOYO_SYMLINK_TARGET:
+ symlink = obj ? obj->symlink_target : NULL;
+ if (!symlink ||
+ !tomoyo_compare_name_union(symlink, ptr)
+ == match)
+ goto out;
+ break;
+ case TOMOYO_EXEC_REALPATH:
+ ee = r->ee;
+ file = ee ? ee->bprm->file : NULL;
+ if (!tomoyo_scan_exec_realpath(file, ptr,
+ match))
+ goto out;
+ break;
+ }
+ continue;
+ }
/* Check numeric or bit-op expressions. */
for (j = 0; j < 2; j++) {
const u8 index = j ? right : left;