tree fbb813220a57f4c8fbc110b933ff3698e67ec75d
parent de0b65ca55dc62b6b477f6e02088df2281da7b51
author Jeff Layton <jlayton@redhat.com> 1360157335 -0500
committer J. Bruce Fields <bfields@redhat.com> 1360354750 -0500

sunrpc: trim off trailing checksum before returning decrypted or integrity authenticated buffer

When GSSAPI integrity signatures are in use, or when we're using GSSAPI
privacy with the v2 token format, there is a trailing checksum on the
xdr_buf that is returned.

It's checked during the authentication stage, and afterward nothing
cares about it. Ordinarily, it's not a problem since the XDR code
generally ignores it, but it will be when we try to compute a checksum
over the buffer to help prevent XID collisions in the duplicate reply
cache.

Fix the code to trim off the checksums after verifying them. Note that
in unwrap_integ_data, we must avoid trying to reverify the checksum if
the request was deferred since it will no longer be present when it's
revisited.

Signed-off-by: Jeff Layton <jlayton@redhat.com>