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ksmbd: mark SMB2_SESSION_EXPIRED to session when destroying previous session

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Currently ksmbd exit connection as well destroying previous session.
When testing durable handle feaure, I found that
destroy_previous_session() should destroy only session, i.e. the
connection should be still alive. This patch mark SMB2_SESSION_EXPIRED
on the previous session to be destroyed later and not used anymore.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2024-03-10 19:30:51 +09:00 committed by Steve French
parent 34cd86b663
commit fa9415d402
3 changed files with 29 additions and 25 deletions
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27
fs/smb/server/mgmt/user_session.c
View File

@ -156,7 +156,7 @@ void ksmbd_session_destroy(struct ksmbd_session *sess)
kfree(sess); kfree(sess);
} }
static struct ksmbd_session *__session_lookup(unsigned long long id) struct ksmbd_session *__session_lookup(unsigned long long id)
{ {
struct ksmbd_session *sess; struct ksmbd_session *sess;
@ -305,6 +305,31 @@ struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
return sess; return sess;
} }
void destroy_previous_session(struct ksmbd_conn *conn,
struct ksmbd_user *user, u64 id)
{
struct ksmbd_session *prev_sess;
struct ksmbd_user *prev_user;
down_write(&sessions_table_lock);
down_write(&conn->session_lock);
prev_sess = __session_lookup(id);
if (!prev_sess || prev_sess->state == SMB2_SESSION_EXPIRED)
goto out;
prev_user = prev_sess->user;
if (!prev_user ||
strcmp(user->name, prev_user->name) ||
user->passkey_sz != prev_user->passkey_sz ||
memcmp(user->passkey, prev_user->passkey, user->passkey_sz))
goto out;
prev_sess->state = SMB2_SESSION_EXPIRED;
out:
up_write(&conn->session_lock);
up_write(&sessions_table_lock);
}
static bool ksmbd_preauth_session_id_match(struct preauth_session *sess, static bool ksmbd_preauth_session_id_match(struct preauth_session *sess,
unsigned long long id) unsigned long long id)
{ {

3
fs/smb/server/mgmt/user_session.h
View File

@ -88,8 +88,11 @@ struct ksmbd_session *ksmbd_session_lookup(struct ksmbd_conn *conn,
int ksmbd_session_register(struct ksmbd_conn *conn, int ksmbd_session_register(struct ksmbd_conn *conn,
struct ksmbd_session *sess); struct ksmbd_session *sess);
void ksmbd_sessions_deregister(struct ksmbd_conn *conn); void ksmbd_sessions_deregister(struct ksmbd_conn *conn);
struct ksmbd_session *__session_lookup(unsigned long long id);
struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn, struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn,
unsigned long long id); unsigned long long id);
void destroy_previous_session(struct ksmbd_conn *conn,
struct ksmbd_user *user, u64 id);
struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn, struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
u64 sess_id); u64 sess_id);
struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn, struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn,

24
fs/smb/server/smb2pdu.c
View File

@ -607,30 +607,6 @@ int smb2_check_user_session(struct ksmbd_work *work)
return -ENOENT; return -ENOENT;
} }
static void destroy_previous_session(struct ksmbd_conn *conn,
struct ksmbd_user *user, u64 id)
{
struct ksmbd_session *prev_sess = ksmbd_session_lookup_slowpath(id);
struct ksmbd_user *prev_user;
struct channel *chann;
long index;
if (!prev_sess)
return;
prev_user = prev_sess->user;
if (!prev_user ||
strcmp(user->name, prev_user->name) ||
user->passkey_sz != prev_user->passkey_sz ||
memcmp(user->passkey, prev_user->passkey, user->passkey_sz))
return;
prev_sess->state = SMB2_SESSION_EXPIRED;
xa_for_each(&prev_sess->ksmbd_chann_list, index, chann)
ksmbd_conn_set_exiting(chann->conn);
}
/** /**
* smb2_get_name() - get filename string from on the wire smb format * smb2_get_name() - get filename string from on the wire smb format
* @src: source buffer * @src: source buffer