[PATCH 3/3] ksmbd: fill sids in SMB_FIND_FILE_POSIX_INFO response

[Namjae Jeon <linkinjeon@xxxxxxxxxx>]

This patch fill missing sids in SMB_FIND_FILE_POSIX_INFO response.

Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
---
 fs/ksmbd/smb2pdu.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 5c797cc09494..9dd6033bc4de 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -4717,6 +4717,9 @@ static int find_file_posix_info(struct smb2_query_info_rsp *rsp,
 {
 	struct smb311_posix_qinfo *file_info;
 	struct inode *inode = file_inode(fp->filp);
+	struct user_namespace *user_ns = file_mnt_user_ns(fp->filp);
+	vfsuid_t vfsuid = i_uid_into_vfsuid(user_ns, inode);
+	vfsgid_t vfsgid = i_gid_into_vfsgid(user_ns, inode);
 	u64 time;
 
 	file_info = (struct smb311_posix_qinfo *)rsp->Buffer;
@@ -4734,9 +4737,15 @@ static int find_file_posix_info(struct smb2_query_info_rsp *rsp,
 	file_info->HardLinks = cpu_to_le32(inode->i_nlink);
 	file_info->Mode = cpu_to_le32(inode->i_mode & 0777);
 	file_info->DeviceId = cpu_to_le32(inode->i_rdev);
+
+	id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)),
+		  SIDUNIX_USER, (struct smb_sid *)&file_info->Sids[0]);
+	id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)),
+		  SIDUNIX_GROUP, (struct smb_sid *)&file_info->Sids[16]);
+
 	rsp->OutputBufferLength =
-		cpu_to_le32(sizeof(struct smb311_posix_qinfo));
-	inc_rfc1001_len(rsp_org, sizeof(struct smb311_posix_qinfo));
+		cpu_to_le32(sizeof(struct smb311_posix_qinfo) + 32);
+	inc_rfc1001_len(rsp_org, sizeof(struct smb311_posix_qinfo) + 32);
 	return 0;
 }
 
@@ -4858,7 +4867,7 @@ static int smb2_get_info_file(struct ksmbd_work *work,
 			rc = -EOPNOTSUPP;
 		} else {
 			rc = find_file_posix_info(rsp, fp, work->response_buf);
-			file_infoclass_size = sizeof(struct smb311_posix_qinfo);
+			file_infoclass_size = sizeof(struct smb311_posix_qinfo) + 32;
 		}
 		break;
 	default:
-- 
2.25.1