5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Namjae Jeon <linkinjeon@xxxxxxxxxx>
[ Upstream commit 7aa8804c0b67b3cb263a472d17f2cb50d7f1a930 ]
There is racy issue between smb2 session log off and smb2 session setup.
It will cause user-after-free from session log off.
This add session_lock when setting SMB2_SESSION_EXPIRED and referece
count to session struct not to free session while it is being used.
Cc: stable@xxxxxxxxxxxxxxx # v5.15+
Reported-by: zdi-disclosures@xxxxxxxxxxxxxx # ZDI-CAN-25282
Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/ksmbd/mgmt/user_session.c | 26 +++++++++++++++++++++-----
fs/ksmbd/mgmt/user_session.h | 4 ++++
fs/ksmbd/server.c | 2 ++
fs/ksmbd/smb2pdu.c | 8 +++++++-
4 files changed, 34 insertions(+), 6 deletions(-)
diff --git a/fs/ksmbd/mgmt/user_session.c b/fs/ksmbd/mgmt/user_session.c
index 15f68ee050894..844db95e66511 100644
--- a/fs/ksmbd/mgmt/user_session.c
+++ b/fs/ksmbd/mgmt/user_session.c
@@ -176,9 +176,10 @@ static void ksmbd_expire_session(struct ksmbd_conn *conn)
down_write(&conn->session_lock);
xa_for_each(&conn->sessions, id, sess) {
- if (sess->state != SMB2_SESSION_VALID ||
- time_after(jiffies,
- sess->last_active + SMB2_SESSION_TIMEOUT)) {
+ if (atomic_read(&sess->refcnt) == 0 &&
+ (sess->state != SMB2_SESSION_VALID ||
+ time_after(jiffies,
+ sess->last_active + SMB2_SESSION_TIMEOUT))) {
xa_erase(&conn->sessions, sess->id);
hash_del(&sess->hlist);
ksmbd_session_destroy(sess);
@@ -268,8 +269,6 @@ struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id)
down_read(&sessions_table_lock);
sess = __session_lookup(id);
- if (sess)
- sess->last_active = jiffies;
up_read(&sessions_table_lock);
return sess;
@@ -288,6 +287,22 @@ struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn,
return sess;
}
+void ksmbd_user_session_get(struct ksmbd_session *sess)
+{
+ atomic_inc(&sess->refcnt);
+}
+
+void ksmbd_user_session_put(struct ksmbd_session *sess)
+{
+ if (!sess)
+ return;
+
+ if (atomic_read(&sess->refcnt) <= 0)
+ WARN_ON(1);
+ else
+ atomic_dec(&sess->refcnt);
+}
+
struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
u64 sess_id)
{
@@ -356,6 +371,7 @@ static struct ksmbd_session *__session_create(int protocol)
xa_init(&sess->rpc_handle_list);
sess->sequence_number = 1;
rwlock_init(&sess->tree_conns_lock);
+ atomic_set(&sess->refcnt, 1);
ret = __init_smb2_session(sess);
if (ret)
diff --git a/fs/ksmbd/mgmt/user_session.h b/fs/ksmbd/mgmt/user_session.h
index 63cb08fffde84..ce91b1d698e71 100644
--- a/fs/ksmbd/mgmt/user_session.h
+++ b/fs/ksmbd/mgmt/user_session.h
@@ -61,6 +61,8 @@ struct ksmbd_session {
struct ksmbd_file_table file_table;
unsigned long last_active;
rwlock_t tree_conns_lock;
+
+ atomic_t refcnt;
};
static inline int test_session_flag(struct ksmbd_session *sess, int bit)
@@ -101,4 +103,6 @@ void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id);
int ksmbd_session_rpc_open(struct ksmbd_session *sess, char *rpc_name);
void ksmbd_session_rpc_close(struct ksmbd_session *sess, int id);
int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id);
+void ksmbd_user_session_get(struct ksmbd_session *sess);
+void ksmbd_user_session_put(struct ksmbd_session *sess);
#endif /* __USER_SESSION_MANAGEMENT_H__ */
diff --git a/fs/ksmbd/server.c b/fs/ksmbd/server.c
index 63b01f7d97031..09ebcf39d5bcb 100644
--- a/fs/ksmbd/server.c
+++ b/fs/ksmbd/server.c
@@ -238,6 +238,8 @@ static void __handle_ksmbd_work(struct ksmbd_work *work,
} while (is_chained == true);
send:
+ if (work->sess)
+ ksmbd_user_session_put(work->sess);
if (work->tcon)
ksmbd_tree_connect_put(work->tcon);
smb3_preauth_hash_rsp(work);
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 089dc2f51229a..54f7cf7a98b2b 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -606,8 +606,10 @@ int smb2_check_user_session(struct ksmbd_work *work)
/* Check for validity of user session */
work->sess = ksmbd_session_lookup_all(conn, sess_id);
- if (work->sess)
+ if (work->sess) {
+ ksmbd_user_session_get(work->sess);
return 1;
+ }
ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id);
return -ENOENT;
}
@@ -1761,6 +1763,7 @@ int smb2_sess_setup(struct ksmbd_work *work)
}
conn->binding = true;
+ ksmbd_user_session_get(sess);
} else if ((conn->dialect < SMB30_PROT_ID ||
server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) &&
(req->Flags & SMB2_SESSION_REQ_FLAG_BINDING)) {
@@ -1787,6 +1790,7 @@ int smb2_sess_setup(struct ksmbd_work *work)
}
conn->binding = false;
+ ksmbd_user_session_get(sess);
}
work->sess = sess;
@@ -2235,7 +2239,9 @@ int smb2_session_logoff(struct ksmbd_work *work)
}
ksmbd_destroy_file_table(&sess->file_table);
+ down_write(&conn->session_lock);
sess->state = SMB2_SESSION_EXPIRED;
+ up_write(&conn->session_lock);
ksmbd_free_user(sess->user);
sess->user = NULL;
--
2.43.0
