TOMOYO: Remove alias keyword.
Some programs behave differently depending on argv[0] passed to execve().
TOMOYO has "alias" keyword in order to allow administrators to define different
domains if requested pathname passed to execve() is a symlink. But "alias"
keyword is incomplete because this keyword assumes that requested pathname and
argv[0] are identical. Thus, remove "alias" keyword (by this patch) and add
syntax for checking argv[0] (by future patches).
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/domain.c b/security/tomoyo/domain.c
index 038071a..273e670 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -467,72 +467,6 @@
return tomoyo_update_aggregator_entry(data, cp, is_delete);
}
-static bool tomoyo_same_alias_entry(const struct tomoyo_acl_head *a,
- const struct tomoyo_acl_head *b)
-{
- const struct tomoyo_alias_entry *p1 = container_of(a, typeof(*p1),
- head);
- const struct tomoyo_alias_entry *p2 = container_of(b, typeof(*p2),
- head);
- return p1->original_name == p2->original_name &&
- p1->aliased_name == p2->aliased_name;
-}
-
-/**
- * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list.
- *
- * @original_name: The original program's real name.
- * @aliased_name: The symbolic program's symbolic link's name.
- * @is_delete: True if it is a delete request.
- *
- * Returns 0 on success, negative value otherwise.
- *
- * Caller holds tomoyo_read_lock().
- */
-static int tomoyo_update_alias_entry(const char *original_name,
- const char *aliased_name,
- const bool is_delete)
-{
- struct tomoyo_alias_entry e = { };
- int error = is_delete ? -ENOENT : -ENOMEM;
-
- if (!tomoyo_correct_path(original_name) ||
- !tomoyo_correct_path(aliased_name))
- return -EINVAL;
- e.original_name = tomoyo_get_name(original_name);
- e.aliased_name = tomoyo_get_name(aliased_name);
- if (!e.original_name || !e.aliased_name ||
- e.original_name->is_patterned || e.aliased_name->is_patterned)
- goto out; /* No patterns allowed. */
- error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
- &tomoyo_policy_list[TOMOYO_ID_ALIAS],
- tomoyo_same_alias_entry);
- out:
- tomoyo_put_name(e.original_name);
- tomoyo_put_name(e.aliased_name);
- return error;
-}
-
-/**
- * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list.
- *
- * @data: String to parse.
- * @is_delete: True if it is a delete request.
- *
- * Returns 0 on success, negative value otherwise.
- *
- * Caller holds tomoyo_read_lock().
- */
-int tomoyo_write_alias_policy(char *data, const bool is_delete)
-{
- char *cp = strchr(data, ' ');
-
- if (!cp)
- return -EINVAL;
- *cp++ = '\0';
- return tomoyo_update_alias_entry(data, cp, is_delete);
-}
-
/**
* tomoyo_find_or_assign_new_domain - Create a domain.
*
@@ -606,7 +540,6 @@
int retval = -ENOMEM;
bool need_kfree = false;
struct tomoyo_path_info rn = { }; /* real name */
- struct tomoyo_path_info sn = { }; /* symlink name */
struct tomoyo_path_info ln; /* last name */
ln.name = tomoyo_get_last_name(old_domain);
@@ -621,39 +554,14 @@
kfree(rn.name);
need_kfree = false;
}
- /* Get tomoyo_realpath of program. */
+ /* Get symlink's pathname of program. */
retval = -ENOENT;
- rn.name = tomoyo_realpath(original_name);
+ rn.name = tomoyo_realpath_nofollow(original_name);
if (!rn.name)
goto out;
tomoyo_fill_path_info(&rn);
need_kfree = true;
- /* Get tomoyo_realpath of symbolic link. */
- sn.name = tomoyo_realpath_nofollow(original_name);
- if (!sn.name)
- goto out;
- tomoyo_fill_path_info(&sn);
-
- /* Check 'alias' directive. */
- if (tomoyo_pathcmp(&rn, &sn)) {
- struct tomoyo_alias_entry *ptr;
- /* Is this program allowed to be called via symbolic links? */
- list_for_each_entry_rcu(ptr,
- &tomoyo_policy_list[TOMOYO_ID_ALIAS],
- head.list) {
- if (ptr->head.is_deleted ||
- tomoyo_pathcmp(&rn, ptr->original_name) ||
- tomoyo_pathcmp(&sn, ptr->aliased_name))
- continue;
- kfree(rn.name);
- need_kfree = false;
- /* This is OK because it is read only. */
- rn = *ptr->aliased_name;
- break;
- }
- }
-
/* Check 'aggregator' directive. */
{
struct tomoyo_aggregator_entry *ptr;
@@ -663,8 +571,7 @@
!tomoyo_path_matches_pattern(&rn,
ptr->original_name))
continue;
- if (need_kfree)
- kfree(rn.name);
+ kfree(rn.name);
need_kfree = false;
/* This is OK because it is read only. */
rn = *ptr->aggregated_name;
@@ -729,7 +636,6 @@
bprm->cred->security = domain;
if (need_kfree)
kfree(rn.name);
- kfree(sn.name);
kfree(tmp);
return retval;
}