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| author | Mi Jinlong <mijinlong@cn.fujitsu.com> | 2011-07-14 14:50:17 +0800 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2011-07-15 18:58:51 -0400 |
| commit | 1b74c25bc1a142ee8dd7ad080e2a974f28d1cb18 (patch) | |
| tree | 99da76bc4a03e876e9f84e3a85a83518c4aa9bf9 /fs/nfsd | |
| parent | f197c27196a5e7631b89e2e92daa096fcf7c302c (diff) | |
| download | linux-1b74c25bc1a142ee8dd7ad080e2a974f28d1cb18.tar.bz2 | |
nfsd41: error out when client sets maxreq_sz or maxresp_sz too small
According to RFC5661, 18.36.3,
"if the client selects a value for ca_maxresponsesize such that
a replier on a channel could never send a response,the server
SHOULD return NFS4ERR_TOOSMALL in the CREATE_SESSION reply."
So, error out when the client sets a maxreq_sz less than the minimum
possible SEQUENCE request size, or sets a maxresp_sz less than the
minimum possible SEQUENCE reply size.
Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index e252aa79c94f..fe4ba68886d8 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1506,6 +1506,29 @@ nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, return slot->sl_status; } +#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\ + 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \ + 1 + /* MIN tag is length with zero, only length */ \ + 3 + /* version, opcount, opcode */ \ + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ + /* seqid, slotID, slotID, cache */ \ + 4 ) * sizeof(__be32)) + +#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\ + 2 + /* verifier: AUTH_NULL, length 0 */\ + 1 + /* status */ \ + 1 + /* MIN tag is length with zero, only length */ \ + 3 + /* opcount, opcode, opstatus*/ \ + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \ + /* seqid, slotID, slotID, slotID, status */ \ + 5 ) * sizeof(__be32)) + +static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs fchannel) +{ + return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ + || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ; +} + __be32 nfsd4_create_session(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, @@ -1574,6 +1597,10 @@ nfsd4_create_session(struct svc_rqst *rqstp, cr_ses->flags &= ~SESSION4_PERSIST; cr_ses->flags &= ~SESSION4_RDMA; + status = nfserr_toosmall; + if (check_forechannel_attrs(cr_ses->fore_channel)) + goto out; + status = nfserr_jukebox; new = alloc_init_session(rqstp, conf, cr_ses); if (!new) |