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Diffstat (limited to 'security/keys/process_keys.c')
-rw-r--r--security/keys/process_keys.c167
1 files changed, 102 insertions, 65 deletions
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index c089f78fb94..566b1cc0118 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -39,7 +39,7 @@ struct key root_user_keyring = {
.type = &key_type_keyring,
.user = &root_key_user,
.sem = __RWSEM_INITIALIZER(root_user_keyring.sem),
- .perm = KEY_USR_ALL,
+ .perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
.flags = 1 << KEY_FLAG_INSTANTIATED,
.description = "_uid.0",
#ifdef KEY_DEBUGGING
@@ -54,7 +54,7 @@ struct key root_session_keyring = {
.type = &key_type_keyring,
.user = &root_key_user,
.sem = __RWSEM_INITIALIZER(root_session_keyring.sem),
- .perm = KEY_USR_ALL,
+ .perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL,
.flags = 1 << KEY_FLAG_INSTANTIATED,
.description = "_uid_ses.0",
#ifdef KEY_DEBUGGING
@@ -98,7 +98,7 @@ int alloc_uid_keyring(struct user_struct *user)
user->session_keyring = session_keyring;
ret = 0;
- error:
+error:
return ret;
} /* end alloc_uid_keyring() */
@@ -156,7 +156,7 @@ int install_thread_keyring(struct task_struct *tsk)
ret = 0;
key_put(old);
- error:
+error:
return ret;
} /* end install_thread_keyring() */
@@ -193,7 +193,7 @@ int install_process_keyring(struct task_struct *tsk)
}
ret = 0;
- error:
+error:
return ret;
} /* end install_process_keyring() */
@@ -236,7 +236,7 @@ static int install_session_keyring(struct task_struct *tsk,
/* we're using RCU on the pointer */
synchronize_rcu();
key_put(old);
- error:
+error:
return ret;
} /* end install_session_keyring() */
@@ -376,13 +376,13 @@ void key_fsgid_changed(struct task_struct *tsk)
* - we return -EAGAIN if we didn't find any matching key
* - we return -ENOKEY if we found only negative matching keys
*/
-struct key *search_process_keyrings(struct key_type *type,
- const void *description,
- key_match_func_t match,
- struct task_struct *context)
+key_ref_t search_process_keyrings(struct key_type *type,
+ const void *description,
+ key_match_func_t match,
+ struct task_struct *context)
{
struct request_key_auth *rka;
- struct key *key, *ret, *err, *instkey;
+ key_ref_t key_ref, ret, err, instkey_ref;
/* we want to return -EAGAIN or -ENOKEY if any of the keyrings were
* searchable, but we failed to find a key or we found a negative key;
@@ -391,46 +391,48 @@ struct key *search_process_keyrings(struct key_type *type,
*
* in terms of priority: success > -ENOKEY > -EAGAIN > other error
*/
- key = NULL;
+ key_ref = NULL;
ret = NULL;
err = ERR_PTR(-EAGAIN);
/* search the thread keyring first */
if (context->thread_keyring) {
- key = keyring_search_aux(context->thread_keyring,
- context, type, description, match);
- if (!IS_ERR(key))
+ key_ref = keyring_search_aux(
+ make_key_ref(context->thread_keyring, 1),
+ context, type, description, match);
+ if (!IS_ERR(key_ref))
goto found;
- switch (PTR_ERR(key)) {
+ switch (PTR_ERR(key_ref)) {
case -EAGAIN: /* no key */
if (ret)
break;
case -ENOKEY: /* negative key */
- ret = key;
+ ret = key_ref;
break;
default:
- err = key;
+ err = key_ref;
break;
}
}
/* search the process keyring second */
if (context->signal->process_keyring) {
- key = keyring_search_aux(context->signal->process_keyring,
- context, type, description, match);
- if (!IS_ERR(key))
+ key_ref = keyring_search_aux(
+ make_key_ref(context->signal->process_keyring, 1),
+ context, type, description, match);
+ if (!IS_ERR(key_ref))
goto found;
- switch (PTR_ERR(key)) {
+ switch (PTR_ERR(key_ref)) {
case -EAGAIN: /* no key */
if (ret)
break;
case -ENOKEY: /* negative key */
- ret = key;
+ ret = key_ref;
break;
default:
- err = key;
+ err = key_ref;
break;
}
}
@@ -438,23 +440,25 @@ struct key *search_process_keyrings(struct key_type *type,
/* search the session keyring */
if (context->signal->session_keyring) {
rcu_read_lock();
- key = keyring_search_aux(
- rcu_dereference(context->signal->session_keyring),
+ key_ref = keyring_search_aux(
+ make_key_ref(rcu_dereference(
+ context->signal->session_keyring),
+ 1),
context, type, description, match);
rcu_read_unlock();
- if (!IS_ERR(key))
+ if (!IS_ERR(key_ref))
goto found;
- switch (PTR_ERR(key)) {
+ switch (PTR_ERR(key_ref)) {
case -EAGAIN: /* no key */
if (ret)
break;
case -ENOKEY: /* negative key */
- ret = key;
+ ret = key_ref;
break;
default:
- err = key;
+ err = key_ref;
break;
}
@@ -465,51 +469,54 @@ struct key *search_process_keyrings(struct key_type *type,
goto no_key;
rcu_read_lock();
- instkey = __keyring_search_one(
- rcu_dereference(context->signal->session_keyring),
+ instkey_ref = __keyring_search_one(
+ make_key_ref(rcu_dereference(
+ context->signal->session_keyring),
+ 1),
&key_type_request_key_auth, NULL, 0);
rcu_read_unlock();
- if (IS_ERR(instkey))
+ if (IS_ERR(instkey_ref))
goto no_key;
- rka = instkey->payload.data;
+ rka = key_ref_to_ptr(instkey_ref)->payload.data;
- key = search_process_keyrings(type, description, match,
- rka->context);
- key_put(instkey);
+ key_ref = search_process_keyrings(type, description, match,
+ rka->context);
+ key_ref_put(instkey_ref);
- if (!IS_ERR(key))
+ if (!IS_ERR(key_ref))
goto found;
- switch (PTR_ERR(key)) {
+ switch (PTR_ERR(key_ref)) {
case -EAGAIN: /* no key */
if (ret)
break;
case -ENOKEY: /* negative key */
- ret = key;
+ ret = key_ref;
break;
default:
- err = key;
+ err = key_ref;
break;
}
}
/* or search the user-session keyring */
else {
- key = keyring_search_aux(context->user->session_keyring,
- context, type, description, match);
- if (!IS_ERR(key))
+ key_ref = keyring_search_aux(
+ make_key_ref(context->user->session_keyring, 1),
+ context, type, description, match);
+ if (!IS_ERR(key_ref))
goto found;
- switch (PTR_ERR(key)) {
+ switch (PTR_ERR(key_ref)) {
case -EAGAIN: /* no key */
if (ret)
break;
case -ENOKEY: /* negative key */
- ret = key;
+ ret = key_ref;
break;
default:
- err = key;
+ err = key_ref;
break;
}
}
@@ -517,29 +524,40 @@ struct key *search_process_keyrings(struct key_type *type,
no_key:
/* no key - decide on the error we're going to go for */
- key = ret ? ret : err;
+ key_ref = ret ? ret : err;
found:
- return key;
+ return key_ref;
} /* end search_process_keyrings() */
/*****************************************************************************/
/*
+ * see if the key we're looking at is the target key
+ */
+static int lookup_user_key_possessed(const struct key *key, const void *target)
+{
+ return key == target;
+
+} /* end lookup_user_key_possessed() */
+
+/*****************************************************************************/
+/*
* lookup a key given a key ID from userspace with a given permissions mask
* - don't create special keyrings unless so requested
* - partially constructed keys aren't found unless requested
*/
-struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
- int create, int partial, key_perm_t perm)
+key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id,
+ int create, int partial, key_perm_t perm)
{
+ key_ref_t key_ref, skey_ref;
struct key *key;
int ret;
if (!context)
context = current;
- key = ERR_PTR(-ENOKEY);
+ key_ref = ERR_PTR(-ENOKEY);
switch (id) {
case KEY_SPEC_THREAD_KEYRING:
@@ -556,6 +574,7 @@ struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
key = context->thread_keyring;
atomic_inc(&key->usage);
+ key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_PROCESS_KEYRING:
@@ -572,6 +591,7 @@ struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
key = context->signal->process_keyring;
atomic_inc(&key->usage);
+ key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_SESSION_KEYRING:
@@ -579,7 +599,7 @@ struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
/* always install a session keyring upon access if one
* doesn't exist yet */
ret = install_session_keyring(
- context, context->user->session_keyring);
+ context, context->user->session_keyring);
if (ret < 0)
goto error;
}
@@ -588,16 +608,19 @@ struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
key = rcu_dereference(context->signal->session_keyring);
atomic_inc(&key->usage);
rcu_read_unlock();
+ key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_USER_KEYRING:
key = context->user->uid_keyring;
atomic_inc(&key->usage);
+ key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_USER_SESSION_KEYRING:
key = context->user->session_keyring;
atomic_inc(&key->usage);
+ key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_GROUP_KEYRING:
@@ -606,13 +629,28 @@ struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
goto error;
default:
- key = ERR_PTR(-EINVAL);
+ key_ref = ERR_PTR(-EINVAL);
if (id < 1)
goto error;
key = key_lookup(id);
- if (IS_ERR(key))
+ if (IS_ERR(key)) {
+ key_ref = ERR_PTR(PTR_ERR(key));
goto error;
+ }
+
+ key_ref = make_key_ref(key, 0);
+
+ /* check to see if we possess the key */
+ skey_ref = search_process_keyrings(key->type, key,
+ lookup_user_key_possessed,
+ current);
+
+ if (!IS_ERR(skey_ref)) {
+ key_put(key);
+ key_ref = skey_ref;
+ }
+
break;
}
@@ -628,17 +666,16 @@ struct key *lookup_user_key(struct task_struct *context, key_serial_t id,
goto invalid_key;
/* check the permissions */
- ret = -EACCES;
-
- if (!key_task_permission(key, context, perm))
+ ret = key_task_permission(key_ref, context, perm);
+ if (ret < 0)
goto invalid_key;
- error:
- return key;
+error:
+ return key_ref;
- invalid_key:
- key_put(key);
- key = ERR_PTR(ret);
+invalid_key:
+ key_ref_put(key_ref);
+ key_ref = ERR_PTR(ret);
goto error;
} /* end lookup_user_key() */
@@ -694,9 +731,9 @@ long join_session_keyring(const char *name)
ret = keyring->serial;
key_put(keyring);
- error2:
+error2:
up(&key_session_sem);
- error:
+error:
return ret;
} /* end join_session_keyring() */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-15 23:20:06 +0000