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-rw-r--r--security/keys/keyring.c86
1 files changed, 50 insertions, 36 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index 9c208c756df..0639396dd44 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c
@@ -309,7 +309,7 @@ struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
int ret;
keyring = key_alloc(&key_type_keyring, description,
- uid, gid, KEY_USR_ALL, not_in_quota);
+ uid, gid, KEY_POS_ALL | KEY_USR_ALL, not_in_quota);
if (!IS_ERR(keyring)) {
ret = key_instantiate_and_link(keyring, NULL, 0, dest, NULL);
@@ -333,12 +333,13 @@ struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
* - we rely on RCU to prevent the keyring lists from disappearing on us
* - we return -EAGAIN if we didn't find any matching key
* - we return -ENOKEY if we only found negative matching keys
+ * - we propagate the possession attribute from the keyring ref to the key ref
*/
-struct key *keyring_search_aux(struct key *keyring,
- struct task_struct *context,
- struct key_type *type,
- const void *description,
- key_match_func_t match)
+key_ref_t keyring_search_aux(key_ref_t keyring_ref,
+ struct task_struct *context,
+ struct key_type *type,
+ const void *description,
+ key_match_func_t match)
{
struct {
struct keyring_list *keylist;
@@ -347,29 +348,33 @@ struct key *keyring_search_aux(struct key *keyring,
struct keyring_list *keylist;
struct timespec now;
- struct key *key;
+ unsigned long possessed;
+ struct key *keyring, *key;
+ key_ref_t key_ref;
long err;
int sp, kix;
+ keyring = key_ref_to_ptr(keyring_ref);
+ possessed = is_key_possessed(keyring_ref);
key_check(keyring);
- rcu_read_lock();
-
/* top keyring must have search permission to begin the search */
- key = ERR_PTR(-EACCES);
- if (!key_task_permission(keyring, context, KEY_SEARCH))
+ key_ref = ERR_PTR(-EACCES);
+ if (!key_task_permission(keyring_ref, context, KEY_SEARCH))
goto error;
- key = ERR_PTR(-ENOTDIR);
+ key_ref = ERR_PTR(-ENOTDIR);
if (keyring->type != &key_type_keyring)
goto error;
+ rcu_read_lock();
+
now = current_kernel_time();
err = -EAGAIN;
sp = 0;
/* start processing a new keyring */
- descend:
+descend:
if (test_bit(KEY_FLAG_REVOKED, &keyring->flags))
goto not_this_keyring;
@@ -397,7 +402,8 @@ struct key *keyring_search_aux(struct key *keyring,
continue;
/* key must have search permissions */
- if (!key_task_permission(key, context, KEY_SEARCH))
+ if (!key_task_permission(make_key_ref(key, possessed),
+ context, KEY_SEARCH))
continue;
/* we set a different error code if we find a negative key */
@@ -411,7 +417,7 @@ struct key *keyring_search_aux(struct key *keyring,
/* search through the keyrings nested in this one */
kix = 0;
- ascend:
+ascend:
for (; kix < keylist->nkeys; kix++) {
key = keylist->keys[kix];
if (key->type != &key_type_keyring)
@@ -423,7 +429,8 @@ struct key *keyring_search_aux(struct key *keyring,
if (sp >= KEYRING_SEARCH_MAX_DEPTH)
continue;
- if (!key_task_permission(key, context, KEY_SEARCH))
+ if (!key_task_permission(make_key_ref(key, possessed),
+ context, KEY_SEARCH))
continue;
/* stack the current position */
@@ -438,7 +445,7 @@ struct key *keyring_search_aux(struct key *keyring,
/* the keyring we're looking at was disqualified or didn't contain a
* matching key */
- not_this_keyring:
+not_this_keyring:
if (sp > 0) {
/* resume the processing of a keyring higher up in the tree */
sp--;
@@ -447,16 +454,18 @@ struct key *keyring_search_aux(struct key *keyring,
goto ascend;
}
- key = ERR_PTR(err);
- goto error;
+ key_ref = ERR_PTR(err);
+ goto error_2;
/* we found a viable match */
- found:
+found:
atomic_inc(&key->usage);
key_check(key);
- error:
+ key_ref = make_key_ref(key, possessed);
+error_2:
rcu_read_unlock();
- return key;
+error:
+ return key_ref;
} /* end keyring_search_aux() */
@@ -469,9 +478,9 @@ struct key *keyring_search_aux(struct key *keyring,
* - we return -EAGAIN if we didn't find any matching key
* - we return -ENOKEY if we only found negative matching keys
*/
-struct key *keyring_search(struct key *keyring,
- struct key_type *type,
- const char *description)
+key_ref_t keyring_search(key_ref_t keyring,
+ struct key_type *type,
+ const char *description)
{
if (!type->match)
return ERR_PTR(-ENOKEY);
@@ -488,15 +497,19 @@ EXPORT_SYMBOL(keyring_search);
* search the given keyring only (no recursion)
* - keyring must be locked by caller
*/
-struct key *__keyring_search_one(struct key *keyring,
- const struct key_type *ktype,
- const char *description,
- key_perm_t perm)
+key_ref_t __keyring_search_one(key_ref_t keyring_ref,
+ const struct key_type *ktype,
+ const char *description,
+ key_perm_t perm)
{
struct keyring_list *klist;
- struct key *key;
+ unsigned long possessed;
+ struct key *keyring, *key;
int loop;
+ keyring = key_ref_to_ptr(keyring_ref);
+ possessed = is_key_possessed(keyring_ref);
+
rcu_read_lock();
klist = rcu_dereference(keyring->payload.subscriptions);
@@ -507,21 +520,21 @@ struct key *__keyring_search_one(struct key *keyring,
if (key->type == ktype &&
(!key->type->match ||
key->type->match(key, description)) &&
- key_permission(key, perm) &&
+ key_permission(make_key_ref(key, possessed),
+ perm) &&
!test_bit(KEY_FLAG_REVOKED, &key->flags)
)
goto found;
}
}
- key = ERR_PTR(-ENOKEY);
- goto error;
+ rcu_read_unlock();
+ return ERR_PTR(-ENOKEY);
found:
atomic_inc(&key->usage);
- error:
rcu_read_unlock();
- return key;
+ return make_key_ref(key, possessed);
} /* end __keyring_search_one() */
@@ -603,7 +616,8 @@ struct key *find_keyring_by_name(const char *name, key_serial_t bound)
if (strcmp(keyring->description, name) != 0)
continue;
- if (!key_permission(keyring, KEY_SEARCH))
+ if (!key_permission(make_key_ref(keyring, 0),
+ KEY_SEARCH))
continue;
/* found a potential candidate, but we still need to
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-12 10:44:50 +0000