[PATCH 6.19 026/220] ksmbd: use volume UUID in FS_OBJECT_ID_INFORMATION

Greg Kroah-Hartman
2026-03-23T13:50:43Z

From: Namjae Jeon <linkinjeon@kernel.org>

commit 3a64125730cabc34fccfbc230c2667c2e14f7308 upstream.

Use sb->s_uuid for a proper volume identifier as the primary choice.
For filesystems that do not provide a UUID, fall back to stfs.f_fsid
obtained from vfs_statfs().

Cc: stable@vger.kernel.org
Reported-by: Hyunwoo Kim <imv4bel@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/smb/server/smb2pdu.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -5452,7 +5452,6 @@ static int smb2_get_info_filesystem(stru
struct smb2_query_info_req *req,
struct smb2_query_info_rsp *rsp)
{
- struct ksmbd_session *sess = work->sess;
struct ksmbd_conn *conn = work->conn;
struct ksmbd_share_config *share = work->tcon->share_conf;
int fsinfoclass = 0;
@@ -5589,10 +5588,11 @@ static int smb2_get_info_filesystem(stru

info = (struct object_id_info *)(rsp->Buffer);

- if (!user_guest(sess->user))
- memcpy(info->objid, user_passkey(sess->user), 16);
+ if (path.mnt->mnt_sb->s_uuid_len == 16)
+ memcpy(info->objid, path.mnt->mnt_sb->s_uuid.b,
+ path.mnt->mnt_sb->s_uuid_len);
else
- memset(info->objid, 0, 16);
+ memcpy(info->objid, &stfs.f_fsid, sizeof(stfs.f_fsid));

info->extended_info.magic = cpu_to_le32(EXTENDED_INFO_MAGIC);
info->extended_info.version = cpu_to_le32(1);