1 /* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */
3 #include <linux/sched.h>
7 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
9 struct exp_flavor_info *f;
10 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
12 for (f = exp->ex_flavors; f < end; f++) {
13 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
20 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
22 struct group_info *rqgi;
23 struct group_info *gi;
26 int flags = nfsexp_flags(rqstp, exp);
28 validate_process_creds();
30 /* discard any old override before preparing the new set */
31 revert_creds(get_cred(current_real_cred()));
32 new = prepare_creds();
36 new->fsuid = rqstp->rq_cred.cr_uid;
37 new->fsgid = rqstp->rq_cred.cr_gid;
39 rqgi = rqstp->rq_cred.cr_group_info;
41 if (flags & NFSEXP_ALLSQUASH) {
42 new->fsuid = exp->ex_anon_uid;
43 new->fsgid = exp->ex_anon_gid;
47 } else if (flags & NFSEXP_ROOTSQUASH) {
48 if (uid_eq(new->fsuid, GLOBAL_ROOT_UID))
49 new->fsuid = exp->ex_anon_uid;
50 if (gid_eq(new->fsgid, GLOBAL_ROOT_GID))
51 new->fsgid = exp->ex_anon_gid;
53 gi = groups_alloc(rqgi->ngroups);
57 for (i = 0; i < rqgi->ngroups; i++) {
58 if (gid_eq(GLOBAL_ROOT_GID, rqgi->gid[i]))
59 gi->gid[i] = exp->ex_anon_gid;
61 gi->gid[i] = rqgi->gid[i];
64 /* Each thread allocates its own gi, no race */
67 gi = get_group_info(rqgi);
70 if (uid_eq(new->fsuid, INVALID_UID))
71 new->fsuid = exp->ex_anon_uid;
72 if (gid_eq(new->fsgid, INVALID_GID))
73 new->fsgid = exp->ex_anon_gid;
78 if (!uid_eq(new->fsuid, GLOBAL_ROOT_UID))
79 new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
81 new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
83 validate_process_creds();
84 put_cred(override_creds(new));
86 validate_process_creds();