aboutsummaryrefslogtreecommitdiffstats
path: root/security/keys/request_key.c
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2019-06-26 21:02:32 +0100
committerDavid Howells <dhowells@redhat.com>2019-06-26 21:02:32 +0100
commit0f44e4d976f96c6439da0d6717238efa4b91196e (patch)
tree3cec4bc4ef3faa4e61058e3aff066a7bec1c9d37 /security/keys/request_key.c
parentkeys: Namespace keyring names (diff)
downloadlinux-dev-0f44e4d976f96c6439da0d6717238efa4b91196e.tar.xz
linux-dev-0f44e4d976f96c6439da0d6717238efa4b91196e.zip
keys: Move the user and user-session keyrings to the user_namespace
Move the user and user-session keyrings to the user_namespace struct rather than pinning them from the user_struct struct. This prevents these keyrings from propagating across user-namespaces boundaries with regard to the KEY_SPEC_* flags, thereby making them more useful in a containerised environment. The issue is that a single user_struct may be represent UIDs in several different namespaces. The way the patch does this is by attaching a 'register keyring' in each user_namespace and then sticking the user and user-session keyrings into that. It can then be searched to retrieve them. Signed-off-by: David Howells <dhowells@redhat.com> cc: Jann Horn <jannh@google.com>
Diffstat (limited to '')
-rw-r--r--security/keys/request_key.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 1ffd3803ce29..9201ca96c4df 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -121,7 +121,7 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
struct request_key_auth *rka = get_request_key_auth(authkey);
const struct cred *cred = current_cred();
key_serial_t prkey, sskey;
- struct key *key = rka->target_key, *keyring, *session;
+ struct key *key = rka->target_key, *keyring, *session, *user_session;
char *argv[9], *envp[3], uid_str[12], gid_str[12];
char key_str[12], keyring_str[3][12];
char desc[20];
@@ -129,9 +129,9 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
kenter("{%d},{%d},%s", key->serial, authkey->serial, rka->op);
- ret = install_user_keyrings();
+ ret = look_up_user_keyrings(NULL, &user_session);
if (ret < 0)
- goto error_alloc;
+ goto error_us;
/* allocate a new session keyring */
sprintf(desc, "_req.%u", key->serial);
@@ -169,7 +169,7 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
session = cred->session_keyring;
if (!session)
- session = cred->user->session_keyring;
+ session = user_session;
sskey = session->serial;
sprintf(keyring_str[2], "%d", sskey);
@@ -211,6 +211,8 @@ error_link:
key_put(keyring);
error_alloc:
+ key_put(user_session);
+error_us:
complete_request_key(authkey, ret);
kleave(" = %d", ret);
return ret;
@@ -317,13 +319,15 @@ static int construct_get_dest_keyring(struct key **_dest_keyring)
/* fall through */
case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
- dest_keyring =
- key_get(READ_ONCE(cred->user->session_keyring));
+ ret = look_up_user_keyrings(NULL, &dest_keyring);
+ if (ret < 0)
+ return ret;
break;
case KEY_REQKEY_DEFL_USER_KEYRING:
- dest_keyring =
- key_get(READ_ONCE(cred->user->uid_keyring));
+ ret = look_up_user_keyrings(&dest_keyring, NULL);
+ if (ret < 0)
+ return ret;
break;
case KEY_REQKEY_DEFL_GROUP_KEYRING: