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nfsd4: better reservation of head space for krb5 

RPC_MAX_AUTH_SIZE is scattered around several places.  Better to set it
once in the auth code, where this kind of estimate should be made.  And
while we're at it we can leave it zero when we're not using krb5i or
krb5p.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2014-05-12 18:10:58 -04:00
parent d05d5744ef
commit a5cddc885b
6 changed files with 15 additions and 11 deletions
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4
fs/nfsd/nfs4proc.c
View File

@ -1261,13 +1261,13 @@ static void svcxdr_init_encode(struct svc_rqst *rqstp,
xdr->buf = buf;
xdr->iov = head;
xdr->p = head->iov_base + head->iov_len;
xdr->end = head->iov_base + PAGE_SIZE - 2 * RPC_MAX_AUTH_SIZE;
xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
/* Tail and page_len should be zero at this point: */
buf->len = buf->head[0].iov_len;
xdr->scratch.iov_len = 0;
xdr->page_ptr = buf->pages;
buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
- 2 * RPC_MAX_AUTH_SIZE;
- rqstp->rq_auth_slack;
}
/*

2
fs/nfsd/nfs4state.c
View File

@ -2288,7 +2288,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
session->se_fchannel.maxresp_sz;
status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
nfserr_rep_too_big;
if (xdr_restrict_buflen(xdr, buflen - 2 * RPC_MAX_AUTH_SIZE))
if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
goto out_put_session;
svc_reserve(rqstp, buflen);

5
fs/nfsd/nfs4xdr.c
View File

@ -1611,7 +1611,8 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
DECODE_HEAD;
struct nfsd4_op *op;
bool cachethis = false;
int max_reply = 2 * RPC_MAX_AUTH_SIZE + 8; /* opcnt, status */
int auth_slack= argp->rqstp->rq_auth_slack;
int max_reply = auth_slack + 8; /* opcnt, status */
int readcount = 0;
int readbytes = 0;
int i;
@ -1677,7 +1678,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
svc_reserve(argp->rqstp, max_reply + readbytes);
argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
if (readcount > 1 || max_reply > PAGE_SIZE - 2*RPC_MAX_AUTH_SIZE)
if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
argp->rqstp->rq_splice_ok = false;
DECODE_TAIL;

11
include/linux/sunrpc/svc.h
View File

@ -260,7 +260,10 @@ struct svc_rqst {
void * rq_argp; /* decoded arguments */
void * rq_resp; /* xdr'd results */
void * rq_auth_data; /* flavor-specific data */
int rq_auth_slack; /* extra space xdr code
* should leave in head
* for krb5i, krb5p.
*/
int rq_reserved; /* space on socket outq
* reserved for this request
*/
@ -456,11 +459,7 @@ char * svc_print_addr(struct svc_rqst *, char *, size_t);
*/
static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
{
int added_space = 0;
if (rqstp->rq_authop->flavour)
added_space = RPC_MAX_AUTH_SIZE;
svc_reserve(rqstp, space + added_space);
svc_reserve(rqstp, space + rqstp->rq_auth_slack);
}
#endif /* SUNRPC_SVC_H */

2
net/sunrpc/auth_gss/svcauth_gss.c
View File

@ -1503,6 +1503,7 @@ svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
gc->gc_seq, rsci->mechctx))
goto garbage_args;
rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
break;
case RPC_GSS_SVC_PRIVACY:
/* placeholders for length and seq. number: */
@ -1511,6 +1512,7 @@ svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
gc->gc_seq, rsci->mechctx))
goto garbage_args;
rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
break;
default:
goto auth_err;

2
net/sunrpc/svcauth.c
View File

@ -54,6 +54,8 @@ svc_authenticate(struct svc_rqst *rqstp, __be32 *authp)
}
spin_unlock(&authtab_lock);
rqstp->rq_auth_slack = 0;
rqstp->rq_authop = aops;
return aops->accept(rqstp, authp);
}