From b0d87dbd8bd311d4126f5b34a8494043c487695f Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 5 Sep 2024 15:09:39 -0400 Subject: [PATCH] NFSD: Refactor nfsd_setuser_and_check_port() There are several places where __fh_verify unconditionally dereferences rqstp to check that the connection is suitably secure. They look at rqstp->rq_xprt which is not meaningful in the target use case of "localio" NFS in which the client talks directly to the local server. Prepare these to always succeed when rqstp is NULL. Signed-off-by: NeilBrown Co-developed-by: Mike Snitzer Signed-off-by: Mike Snitzer Signed-off-by: Chuck Lever Reviewed-by: Jeff Layton Signed-off-by: Anna Schumaker --- fs/nfsd/nfsfh.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c index 50d23d56f403..4b964a71a504 100644 --- a/fs/nfsd/nfsfh.c +++ b/fs/nfsd/nfsfh.c @@ -87,23 +87,24 @@ nfsd_mode_check(struct dentry *dentry, umode_t requested) return nfserr_wrong_type; } -static bool nfsd_originating_port_ok(struct svc_rqst *rqstp, int flags) +static bool nfsd_originating_port_ok(struct svc_rqst *rqstp, + struct svc_cred *cred, + struct svc_export *exp) { - if (flags & NFSEXP_INSECURE_PORT) + if (nfsexp_flags(cred, exp) & NFSEXP_INSECURE_PORT) return true; /* We don't require gss requests to use low ports: */ - if (rqstp->rq_cred.cr_flavor >= RPC_AUTH_GSS) + if (cred->cr_flavor >= RPC_AUTH_GSS) return true; return test_bit(RQ_SECURE, &rqstp->rq_flags); } static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, + struct svc_cred *cred, struct svc_export *exp) { - int flags = nfsexp_flags(&rqstp->rq_cred, exp); - /* Check if the request originated from a secure port. */ - if (!nfsd_originating_port_ok(rqstp, flags)) { + if (rqstp && !nfsd_originating_port_ok(rqstp, cred, exp)) { RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); dprintk("nfsd: request from insecure port %s!\n", svc_print_addr(rqstp, buf, sizeof(buf))); @@ -111,7 +112,7 @@ static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp, } /* Set user creds for this exportpoint */ - return nfserrno(nfsd_setuser(&rqstp->rq_cred, exp)); + return nfserrno(nfsd_setuser(cred, exp)); } static inline __be32 check_pseudo_root(struct dentry *dentry, @@ -219,7 +220,7 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp) put_cred(override_creds(new)); put_cred(new); } else { - error = nfsd_setuser_and_check_port(rqstp, exp); + error = nfsd_setuser_and_check_port(rqstp, &rqstp->rq_cred, exp); if (error) goto out; } @@ -358,7 +359,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access) if (error) goto out; - error = nfsd_setuser_and_check_port(rqstp, exp); + error = nfsd_setuser_and_check_port(rqstp, &rqstp->rq_cred, exp); if (error) goto out;