added the R-Bs and merged into cifsd-for-next (current content is
below, although looks like we could update the "buffer invalidation in
smb2_set_info" patch)
e6201b4a0bac (HEAD -> cifsd-for-next, origin/cifsd-for-next) ksmbd:
add request buffer validation in smb2_set_info
743d886affeb ksmbd: remove follow symlinks support
3bee78ad0062 ksmbd: fix invalid request buffer access in compound request
18a015bccf9e ksmbd: check protocol id in ksmbd_verify_smb_message()
9f6323311c70 ksmbd: add default data stream name in FILE_STREAM_INFORMATION
e44fd5081c50 ksmbd: log that server is experimental at module load
On Wed, Sep 22, 2021 at 4:33 PM ronnie sahlberg
<ronniesahlberg@xxxxxxxxx> wrote:
>
> reviewed by me
>
> On Wed, Sep 22, 2021 at 10:01 PM Namjae Jeon <linkinjeon@xxxxxxxxxx> wrote:
> >
> > When second smb2 pdu has invalid protocol id, ksmbd doesn't detect it
> > and allow to process smb2 request. This patch add the check it in
> > ksmbd_verify_smb_message() and don't use protocol id of smb2 request as
> > protocol id of response.
> >
> > Cc: Ronnie Sahlberg <ronniesahlberg@xxxxxxxxx>
> > Cc: Ralph Böhme <slow@xxxxxxxxx>
> > Cc: Steve French <smfrench@xxxxxxxxx>
> > Reported-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
> > Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
> > ---
> > fs/ksmbd/smb2pdu.c | 2 +-
> > fs/ksmbd/smb_common.c | 13 +++++++++----
> > fs/ksmbd/smb_common.h | 1 +
> > 3 files changed, 11 insertions(+), 5 deletions(-)
> >
> > diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
> > index 3d250e2539e6..3be1493cb18d 100644
> > --- a/fs/ksmbd/smb2pdu.c
> > +++ b/fs/ksmbd/smb2pdu.c
> > @@ -433,7 +433,7 @@ static void init_chained_smb2_rsp(struct ksmbd_work *work)
> > work->compound_pfid = KSMBD_NO_FID;
> > }
> > memset((char *)rsp_hdr + 4, 0, sizeof(struct smb2_hdr) + 2);
> > - rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
> > + rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
> > rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
> > rsp_hdr->Command = rcv_hdr->Command;
> >
> > diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
> > index da17b21ac685..ace8a1b02c81 100644
> > --- a/fs/ksmbd/smb_common.c
> > +++ b/fs/ksmbd/smb_common.c
> > @@ -129,16 +129,22 @@ int ksmbd_lookup_protocol_idx(char *str)
> > *
> > * check for valid smb signature and packet direction(request/response)
> > *
> > - * Return: 0 on success, otherwise 1
> > + * Return: 0 on success, otherwise -EINVAL
> > */
> > int ksmbd_verify_smb_message(struct ksmbd_work *work)
> > {
> > - struct smb2_hdr *smb2_hdr = work->request_buf;
> > + struct smb2_hdr *smb2_hdr = work->request_buf + work->next_smb2_rcv_hdr_off;
> > + struct smb_hdr *hdr;
> >
> > if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
> > return ksmbd_smb2_check_message(work);
> >
> > - return 0;
> > + hdr = work->request_buf;
> > + if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
> > + hdr->Command == SMB_COM_NEGOTIATE)
> > + return 0;
> > +
> > + return -EINVAL;
> > }
> >
> > /**
> > @@ -270,7 +276,6 @@ static int ksmbd_negotiate_smb_dialect(void *buf)
> > return BAD_PROT_ID;
> > }
> >
> > -#define SMB_COM_NEGOTIATE 0x72
> > int ksmbd_init_smb_server(struct ksmbd_work *work)
> > {
> > struct ksmbd_conn *conn = work->conn;
> > diff --git a/fs/ksmbd/smb_common.h b/fs/ksmbd/smb_common.h
> > index d7df19c97c4c..994abede27e9 100644
> > --- a/fs/ksmbd/smb_common.h
> > +++ b/fs/ksmbd/smb_common.h
> > @@ -202,6 +202,7 @@
> > FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES)
> >
> > #define SMB1_PROTO_NUMBER cpu_to_le32(0x424d53ff)
> > +#define SMB_COM_NEGOTIATE 0x72
> >
> > #define SMB1_CLIENT_GUID_SIZE (16)
> > struct smb_hdr {
> > --
> > 2.25.1
> >
--
Thanks,
Steve
