5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Atte Heikkilä atteh.mailbox@gmail.com
[ Upstream commit 4963d74f8a6cc0eafd71d9ffc13e3a11ff1dd160 ]
ksmbd_share_config_get() retrieves the cached share config as long as there is at least one connection to the share. This is an issue when the user space utilities are used to update share configs. In that case there is a need to inform ksmbd that it should not use the cached share config for a new connection to the share. With these changes the tree connection flag KSMBD_TREE_CONN_FLAG_UPDATE indicates this. When this flag is set, ksmbd removes the share config from the shares hash table meaning that ksmbd_share_config_get() ends up requesting a share config from user space.
Signed-off-by: Atte Heikkilä atteh.mailbox@gmail.com Acked-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ksmbd/ksmbd_netlink.h | 2 ++ fs/ksmbd/mgmt/share_config.c | 6 +++++- fs/ksmbd/mgmt/share_config.h | 1 + fs/ksmbd/mgmt/tree_connect.c | 14 ++++++++++++++ fs/ksmbd/smb2pdu.c | 1 + 5 files changed, 23 insertions(+), 1 deletion(-)
--- a/fs/ksmbd/ksmbd_netlink.h +++ b/fs/ksmbd/ksmbd_netlink.h @@ -350,6 +350,7 @@ enum KSMBD_TREE_CONN_STATUS { #define KSMBD_SHARE_FLAG_STREAMS BIT(11) #define KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS BIT(12) #define KSMBD_SHARE_FLAG_ACL_XATTR BIT(13) +#define KSMBD_SHARE_FLAG_UPDATE BIT(14)
/* * Tree connect request flags. @@ -365,6 +366,7 @@ enum KSMBD_TREE_CONN_STATUS { #define KSMBD_TREE_CONN_FLAG_READ_ONLY BIT(1) #define KSMBD_TREE_CONN_FLAG_WRITABLE BIT(2) #define KSMBD_TREE_CONN_FLAG_ADMIN_ACCOUNT BIT(3) +#define KSMBD_TREE_CONN_FLAG_UPDATE BIT(4)
/* * RPC over IPC. --- a/fs/ksmbd/mgmt/share_config.c +++ b/fs/ksmbd/mgmt/share_config.c @@ -51,12 +51,16 @@ static void kill_share(struct ksmbd_shar kfree(share); }
-void __ksmbd_share_config_put(struct ksmbd_share_config *share) +void ksmbd_share_config_del(struct ksmbd_share_config *share) { down_write(&shares_table_lock); hash_del(&share->hlist); up_write(&shares_table_lock); +}
+void __ksmbd_share_config_put(struct ksmbd_share_config *share) +{ + ksmbd_share_config_del(share); kill_share(share); }
--- a/fs/ksmbd/mgmt/share_config.h +++ b/fs/ksmbd/mgmt/share_config.h @@ -64,6 +64,7 @@ static inline int test_share_config_flag return share->flags & flag; }
+void ksmbd_share_config_del(struct ksmbd_share_config *share); void __ksmbd_share_config_put(struct ksmbd_share_config *share);
static inline void ksmbd_share_config_put(struct ksmbd_share_config *share) --- a/fs/ksmbd/mgmt/tree_connect.c +++ b/fs/ksmbd/mgmt/tree_connect.c @@ -57,6 +57,20 @@ ksmbd_tree_conn_connect(struct ksmbd_con goto out_error;
tree_conn->flags = resp->connection_flags; + if (test_tree_conn_flag(tree_conn, KSMBD_TREE_CONN_FLAG_UPDATE)) { + struct ksmbd_share_config *new_sc; + + ksmbd_share_config_del(sc); + new_sc = ksmbd_share_config_get(share_name); + if (!new_sc) { + pr_err("Failed to update stale share config\n"); + status.ret = -ESTALE; + goto out_error; + } + ksmbd_share_config_put(sc); + sc = new_sc; + } + tree_conn->user = sess->user; tree_conn->share_conf = sc; status.tree_conn = tree_conn; --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -1985,6 +1985,7 @@ out_err1: rsp->hdr.Status = STATUS_SUCCESS; rc = 0; break; + case -ESTALE: case -ENOENT: case KSMBD_TREE_CONN_STATUS_NO_SHARE: rsp->hdr.Status = STATUS_BAD_NETWORK_NAME;