kernel.git/fs/smb/server/mgmt, branch linux-6.15.y

ksmbd: fix use-after-free in ksmbd_session_rpc_open

2025-04-23T01:45:43Z

A UAF issue can occur due to a race condition between ksmbd_session_rpc_open() and __session_rpc_close(). Add rpc_lock to the session to protect it. Cc: stable@vger.kernel.org Reported-by: Norbert Szetei Tested-by: Norbert Szetei Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: fix null pointer dereference in alloc_preauth_hash()

2025-04-02T04:02:20Z

The Client send malformed smb2 negotiate request. ksmbd return error response. Subsequently, the client can send smb2 session setup even thought conn->preauth_info is not allocated. This patch add KSMBD_SESS_NEED_SETUP status of connection to ignore session setup request if smb2 negotiate phase is not complete. Cc: stable@vger.kernel.org Tested-by: Steve French Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-26505 Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: fix session use-after-free in multichannel connection

2025-04-01T05:04:21Z

There is a race condition between session setup and ksmbd_sessions_deregister. The session can be freed before the connection is added to channel list of session. This patch check reference count of session before freeing it. Cc: stable@vger.kernel.org Reported-by: Sean Heelan Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: fix multichannel connection failure

2025-03-28T00:12:00Z

ksmbd check that the session of second channel is in the session list of first connection. If it is in session list, multichannel connection should not be allowed. Fixes: b95629435b84 ("ksmbd: fix racy issue from session lookup and expire") Reported-by: Sean Heelan Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: fix use-after-free in ksmbd_sessions_deregister()

2025-03-28T00:12:00Z

In multichannel mode, UAF issue can occur in session_deregister when the second channel sets up a session through the connection of the first channel. session that is freed through the global session table can be accessed again through ->sessions of connection. Cc: stable@vger.kernel.org Reported-by: Norbert Szetei Tested-by: Norbert Szetei Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: fix racy issue from session lookup and expire

2024-12-10T23:48:06Z

Increment the session reference count within the lock for lookup to avoid racy issue with session expire. Cc: stable@vger.kernel.org Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-25737 Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: use __GFP_RETRY_MAYFAIL

2024-11-26T00:58:02Z

Prefer to report ENOMEM rather than incur the oom for allocations in ksmbd. __GFP_NORETRY could not achieve that, It would fail the allocations just too easily. __GFP_RETRY_MAYFAIL will keep retrying the allocation until there is no more progress and fail the allocation instead go OOM and let the caller to deal with it. Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create

2024-11-05T00:26:35Z

There is a race condition between ksmbd_smb2_session_create and ksmbd_expire_session. This patch add missing sessions_table_lock while adding/deleting session from global session table. Cc: stable@vger.kernel.org # v5.15+ Reported-by: Norbert Szetei Tested-by: Norbert Szetei Signed-off-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: Fix the missing xa_store error check

2024-10-27T23:30:05Z

xa_store() can fail, it return xa_err(-EINVAL) if the entry cannot be stored in an XArray, or xa_err(-ENOMEM) if memory allocation failed, so check error for xa_store() to fix it. Cc: stable@vger.kernel.org Fixes: b685757c7b08 ("ksmbd: Implements sess->rpc_handle_list as xarray") Signed-off-by: Jinjie Ruan Acked-by: Namjae Jeon Signed-off-by: Steve French

ksmbd: add support for supplementary groups

2024-10-11T16:02:14Z

Even though system user has a supplementary group, It gets NT_STATUS_ACCESS_DENIED when attempting to create file or directory. This patch add KSMBD_EVENT_LOGIN_REQUEST_EXT/RESPONSE_EXT netlink events to get supplementary groups list. The new netlink event doesn't break backward compatibility when using old ksmbd-tools. Co-developed-by: Atte Heikkilä Signed-off-by: Atte Heikkilä Signed-off-by: Namjae Jeon Signed-off-by: Steve French