[CIFS] Mount should fail if server signing off but client mount option requires it
Currently, if mount with a signing-enabled sec= option (e.g.
sec=ntlmi), the kernel does a warning printk if the server doesn't
support signing, and then proceeds without signatures.
This is probably OK for people that think to look at the ring buffer,
but seems wrong to me. If someone explicitly requests signing, we
should error out if that request can't be satisfied. They can then
reattempt the mount without signing if that's ok.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index b4d388d..258130e 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -12,6 +12,7 @@
available to some newer servers (such as Samba 3.0.26 and later but
note that it also requires setting CIFSMaxBufSize at module install
time to a larger value which may hurt performance in some cases).
+Make sign option force signing (or fail if server does not support it).
Version 1.48
------------
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 4a2458e..b4916eb 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -645,11 +645,12 @@
~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
} else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
/* signing required */
- cFYI(1, ("Must sign - segFlags 0x%x", secFlags));
+ cFYI(1, ("Must sign - secFlags 0x%x", secFlags));
if ((server->secMode &
(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
cERROR(1,
("signing required but server lacks support"));
+ rc = -EOPNOTSUPP;
} else
server->secMode |= SECMODE_SIGN_REQUIRED;
} else {
