nfsd: knfsd must use the container user namespace

Convert knfsd to use the user namespace of the container that started
the server processes.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 802993d8912f..baa01956a5b3 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -570,13 +570,13 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
                 err = get_int(&mesg, &an_int);
                 if (err)
                         goto out3;
-                exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
+                exp.ex_anon_uid= make_kuid(current_user_ns(), an_int);
 
                 /* anon gid */
                 err = get_int(&mesg, &an_int);
                 if (err)
                         goto out3;
-                exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
+                exp.ex_anon_gid= make_kgid(current_user_ns(), an_int);
 
                 /* fsid */
                 err = get_int(&mesg, &an_int);
@@ -1170,15 +1170,17 @@ static void show_secinfo(struct seq_file *m, struct svc_export *exp)
 static void exp_flags(struct seq_file *m, int flag, int fsid,
                 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
 {
+        struct user_namespace *userns = m->file->f_cred->user_ns;
+
         show_expflags(m, flag, NFSEXP_ALLFLAGS);
         if (flag & NFSEXP_FSID)
                 seq_printf(m, ",fsid=%d", fsid);
-        if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
-            !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
-                seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
-        if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
-            !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
-                seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
+        if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) &&
+            !uid_eq(anonu, make_kuid(userns, 0x10000-2)))
+                seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu));
+        if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) &&
+            !gid_eq(anong, make_kgid(userns, 0x10000-2)))
+                seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong));
         if (fsloc && fsloc->locations_count > 0) {
                 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
                 int i;