nfsd: Properly compare and initialize kuids and kgids

Use uid_eq(uid, GLOBAL_ROOT_UID) instead of !uid.
Use gid_eq(gid, GLOBAL_ROOT_GID) instead of !gid.
Use uid_eq(uid, INVALID_UID) instead of uid == -1
Use gid_eq(uid, INVALID_GID) instead of gid == -1
Use uid = GLOBAL_ROOT_UID instead of uid = 0;
Use gid = GLOBAL_ROOT_GID instead of gid = 0;
Use !uid_eq(uid1, uid2) instead of uid1 != uid2.
Use !gid_eq(gid1, gid2) instead of gid1 != gid2.
Use uid_eq(uid1, uid2) instead of uid1 == uid2.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
index 4d6642b..06cddd5 100644 (file)
--- a/fs/nfsd/auth.c
+++ b/fs/nfsd/auth.c
@@ -47,9 +47,9 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
                if (!gi)
                        goto oom;
        } else if (flags & NFSEXP_ROOTSQUASH) {
-               if (!new->fsuid)
+               if (uid_eq(new->fsuid, GLOBAL_ROOT_UID))
                        new->fsuid = exp->ex_anon_uid;
-               if (!new->fsgid)
+               if (gid_eq(new->fsgid, GLOBAL_ROOT_GID))
                        new->fsgid = exp->ex_anon_gid;
 
                gi = groups_alloc(rqgi->ngroups);
@@ -66,9 +66,9 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
                gi = get_group_info(rqgi);
        }
 
-       if (new->fsuid == (uid_t) -1)
+       if (uid_eq(new->fsuid, INVALID_UID))
                new->fsuid = exp->ex_anon_uid;
-       if (new->fsgid == (gid_t) -1)
+       if (gid_eq(new->fsgid, INVALID_GID))
                new->fsgid = exp->ex_anon_gid;
 
        ret = set_groups(new, gi);
@@ -76,7 +76,7 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
        if (ret < 0)
                goto error;
 
-       if (new->fsuid)
+       if (!uid_eq(new->fsuid, GLOBAL_ROOT_UID))
                new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
        else
                new->cap_effective = cap_raise_nfsd_set(new->cap_effective,

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index ba6fdd4..4914af4 100644 (file)
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -73,8 +73,8 @@ nfs4_save_creds(const struct cred **original_creds)
        if (!new)
                return -ENOMEM;
 
-       new->fsuid = 0;
-       new->fsgid = 0;
+       new->fsuid = GLOBAL_ROOT_UID;
+       new->fsgid = GLOBAL_ROOT_GID;
        *original_creds = override_creds(new);
        put_cred(new);
        return 0;

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index ac8ed96..0af6d3c 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1202,7 +1202,7 @@ static bool groups_equal(struct group_info *g1, struct group_info *g2)
        if (g1->ngroups != g2->ngroups)
                return false;
        for (i=0; i<g1->ngroups; i++)
-               if (GROUP_AT(g1, i) != GROUP_AT(g2, i))
+               if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
                        return false;
        return true;
 }
@@ -1227,8 +1227,8 @@ static bool
 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
 {
        if ((is_gss_cred(cr1) != is_gss_cred(cr2))
-               || (cr1->cr_uid != cr2->cr_uid)
-               || (cr1->cr_gid != cr2->cr_gid)
+               || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
+               || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
                || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
                return false;
        if (cr1->cr_principal == cr2->cr_principal)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index d586117..31ff1d6 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -401,8 +401,8 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 
        /* Revoke setuid/setgid on chown */
        if (!S_ISDIR(inode->i_mode) &&
-           (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) ||
-            ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) {
+           (((iap->ia_valid & ATTR_UID) && !uid_eq(iap->ia_uid, inode->i_uid)) ||
+            ((iap->ia_valid & ATTR_GID) && !gid_eq(iap->ia_gid, inode->i_gid)))) {
                iap->ia_valid |= ATTR_KILL_PRIV;
                if (iap->ia_valid & ATTR_MODE) {
                        /* we're setting mode too, just clear the s*id bits */
@@ -1205,7 +1205,7 @@ nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
         * send along the gid on create when it tries to implement
         * setgid directories via NFS:
         */
-       if (current_fsuid() != 0)
+       if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID))
                iap->ia_valid &= ~(ATTR_UID|ATTR_GID);
        if (iap->ia_valid)
                return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
@@ -2150,7 +2150,7 @@ nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
         * with NFSv3.
         */
        if ((acc & NFSD_MAY_OWNER_OVERRIDE) &&
-           inode->i_uid == current_fsuid())
+           uid_eq(inode->i_uid, current_fsuid()))
                return 0;
 
        /* This assumes  NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */