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Diffstat (limited to 'security/keys/process_keys.c')
-rw-r--r--security/keys/process_keys.c66
1 files changed, 22 insertions, 44 deletions
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 178b8c3b130a..9de5dc598276 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -169,9 +169,8 @@ static int install_thread_keyring(void)
int install_process_keyring_to_cred(struct cred *new)
{
struct key *keyring;
- int ret;
- if (new->tgcred->process_keyring)
+ if (new->process_keyring)
return -EEXIST;
keyring = keyring_alloc("_pid", new->uid, new->gid,
@@ -179,17 +178,8 @@ int install_process_keyring_to_cred(struct cred *new)
if (IS_ERR(keyring))
return PTR_ERR(keyring);
- spin_lock_irq(&new->tgcred->lock);
- if (!new->tgcred->process_keyring) {
- new->tgcred->process_keyring = keyring;
- keyring = NULL;
- ret = 0;
- } else {
- ret = -EEXIST;
- }
- spin_unlock_irq(&new->tgcred->lock);
- key_put(keyring);
- return ret;
+ new->process_keyring = keyring;
+ return 0;
}
/*
@@ -230,7 +220,7 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring)
/* create an empty session keyring */
if (!keyring) {
flags = KEY_ALLOC_QUOTA_OVERRUN;
- if (cred->tgcred->session_keyring)
+ if (cred->session_keyring)
flags = KEY_ALLOC_IN_QUOTA;
keyring = keyring_alloc("_ses", cred->uid, cred->gid,
@@ -242,17 +232,11 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring)
}
/* install the keyring */
- spin_lock_irq(&cred->tgcred->lock);
- old = cred->tgcred->session_keyring;
- rcu_assign_pointer(cred->tgcred->session_keyring, keyring);
- spin_unlock_irq(&cred->tgcred->lock);
-
- /* we're using RCU on the pointer, but there's no point synchronising
- * on it if it didn't previously point to anything */
- if (old) {
- synchronize_rcu();
+ old = cred->session_keyring;
+ rcu_assign_pointer(cred->session_keyring, keyring);
+
+ if (old)
key_put(old);
- }
return 0;
}
@@ -367,9 +351,9 @@ key_ref_t search_my_process_keyrings(struct key_type *type,
}
/* search the process keyring second */
- if (cred->tgcred->process_keyring) {
+ if (cred->process_keyring) {
key_ref = keyring_search_aux(
- make_key_ref(cred->tgcred->process_keyring, 1),
+ make_key_ref(cred->process_keyring, 1),
cred, type, description, match, no_state_check);
if (!IS_ERR(key_ref))
goto found;
@@ -388,12 +372,10 @@ key_ref_t search_my_process_keyrings(struct key_type *type,
}
/* search the session keyring */
- if (cred->tgcred->session_keyring) {
+ if (cred->session_keyring) {
rcu_read_lock();
key_ref = keyring_search_aux(
- make_key_ref(rcu_dereference(
- cred->tgcred->session_keyring),
- 1),
+ make_key_ref(rcu_dereference(cred->session_keyring), 1),
cred, type, description, match, no_state_check);
rcu_read_unlock();
@@ -563,7 +545,7 @@ try_again:
break;
case KEY_SPEC_PROCESS_KEYRING:
- if (!cred->tgcred->process_keyring) {
+ if (!cred->process_keyring) {
if (!(lflags & KEY_LOOKUP_CREATE))
goto error;
@@ -575,13 +557,13 @@ try_again:
goto reget_creds;
}
- key = cred->tgcred->process_keyring;
+ key = cred->process_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_SESSION_KEYRING:
- if (!cred->tgcred->session_keyring) {
+ if (!cred->session_keyring) {
/* always install a session keyring upon access if one
* doesn't exist yet */
ret = install_user_keyrings();
@@ -596,7 +578,7 @@ try_again:
if (ret < 0)
goto error;
goto reget_creds;
- } else if (cred->tgcred->session_keyring ==
+ } else if (cred->session_keyring ==
cred->user->session_keyring &&
lflags & KEY_LOOKUP_CREATE) {
ret = join_session_keyring(NULL);
@@ -606,7 +588,7 @@ try_again:
}
rcu_read_lock();
- key = rcu_dereference(cred->tgcred->session_keyring);
+ key = rcu_dereference(cred->session_keyring);
atomic_inc(&key->usage);
rcu_read_unlock();
key_ref = make_key_ref(key, 1);
@@ -766,12 +748,6 @@ long join_session_keyring(const char *name)
struct key *keyring;
long ret, serial;
- /* only permit this if there's a single thread in the thread group -
- * this avoids us having to adjust the creds on all threads and risking
- * ENOMEM */
- if (!current_is_single_threaded())
- return -EMLINK;
-
new = prepare_creds();
if (!new)
return -ENOMEM;
@@ -783,7 +759,7 @@ long join_session_keyring(const char *name)
if (ret < 0)
goto error;
- serial = new->tgcred->session_keyring->serial;
+ serial = new->session_keyring->serial;
ret = commit_creds(new);
if (ret == 0)
ret = serial;
@@ -806,6 +782,9 @@ long join_session_keyring(const char *name)
} else if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;
+ } else if (keyring == new->session_keyring) {
+ ret = 0;
+ goto error2;
}
/* we've got a keyring - now to install it */
@@ -862,8 +841,7 @@ void key_change_session_keyring(struct callback_head *twork)
new->jit_keyring = old->jit_keyring;
new->thread_keyring = key_get(old->thread_keyring);
- new->tgcred->tgid = old->tgcred->tgid;
- new->tgcred->process_keyring = key_get(old->tgcred->process_keyring);
+ new->process_keyring = key_get(old->process_keyring);
security_transfer_creds(new, old);