merged into cifs-2.6.git for-next and added cc:stable On Thu, Jan 11, 2018 at 9:00 AM, Daniel N Pettersson <daniel.n.pettersson@xxxxxxxx> wrote: > From: Daniel N Pettersson <danielnp@xxxxxxxx> > > Autonegotiation gives a security settings mismatch error if the SMB > server selects an SMBv3 dialect that isn't SMB3.02. The exact error is > "protocol revalidation - security settings mismatch". > This can be tested using Samba v4.2 or by setting the global Samba > setting max protocol = SMB3_00. > > The check that fails in smb3_validate_negotiate is the dialect > verification of the negotiate info response. This is because it tries > to verify against the protocol_id in the global smbdefault_values. The > protocol_id in smbdefault_values is SMB3.02. > In SMB2_negotiate the protocol_id in smbdefault_values isn't updated, > it is global so it probably shouldn't be, but server->dialect is. > > This patch changes the check in smb3_validate_negotiate to use > server->dialect instead of server->vals->protocol_id. The patch works > with autonegotiate and when using a specific version in the vers mount > option. > > Signed-off-by: Daniel N Pettersson <danielnp@xxxxxxxx> > --- > fs/cifs/smb2pdu.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c > index 01346b8..66af1f8 100644 > --- a/fs/cifs/smb2pdu.c > +++ b/fs/cifs/smb2pdu.c > @@ -733,8 +733,7 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) > } > > /* check validate negotiate info response matches what we got earlier */ > - if (pneg_rsp->Dialect != > - cpu_to_le16(tcon->ses->server->vals->protocol_id)) > + if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect)) > goto vneg_out; > > if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode)) > -- > 2.1.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-cifs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
