nfsd4: don't allow owner override on 4.1 CLAIM_FH opens
authorJ. Bruce Fields <bfields@redhat.com>
Fri, 3 May 2013 20:09:09 +0000 (16:09 -0400)
committerJ. Bruce Fields <bfields@redhat.com>
Fri, 3 May 2013 20:36:14 +0000 (16:36 -0400)
commit9f415eb25574db4b73a9a712a4438e41dc284922
treec705156d18c80b649249dad2a8cd62768153f5ec
parent676e4ebd5f2c3b4fd1d2bff79b68385c23c5c105
nfsd4: don't allow owner override on 4.1 CLAIM_FH opens

The Linux client is using CLAIM_FH to implement regular opens, not just
recovery cases, so it depends on the server to check permissions
correctly.

Therefore the owner override, which may make sense in the delegation
recovery case, isn't right in the CLAIM_FH case.

Symptoms: on a client with 49f9a0fafd844c32f2abada047c0b9a5ba0d6255
"NFSv4.1: Enable open-by-filehandle", Bryan noticed this:

touch test.txt
chmod 000 test.txt
echo test > test.txt

succeeding.

Cc: stable@kernel.org
Reported-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
fs/nfsd/nfs4proc.c