Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Pull user namespace and namespace infrastructure changes from Eric W Biederman:
 "This set of changes starts with a few small enhnacements to the user
  namespace.  reboot support, allowing more arbitrary mappings, and
  support for mounting devpts, ramfs, tmpfs, and mqueuefs as just the
  user namespace root.

  I do my best to document that if you care about limiting your
  unprivileged users that when you have the user namespace support
  enabled you will need to enable memory control groups.

  There is a minor bug fix to prevent overflowing the stack if someone
  creates way too many user namespaces.

  The bulk of the changes are a continuation of the kuid/kgid push down
  work through the filesystems.  These changes make using uids and gids
  typesafe which ensures that these filesystems are safe to use when
  multiple user namespaces are in use.  The filesystems converted for
  3.9 are ceph, 9p, afs, ocfs2, gfs2, ncpfs, nfs, nfsd, and cifs.  The
  changes for these filesystems were a little more involved so I split
  the changes into smaller hopefully obviously correct changes.

  XFS is the only filesystem that remains.  I was hoping I could get
  that in this release so that user namespace support would be enabled
  with an allyesconfig or an allmodconfig but it looks like the xfs
  changes need another couple of days before it they are ready."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (93 commits)
  cifs: Enable building with user namespaces enabled.
  cifs: Convert struct cifs_ses to use a kuid_t and a kgid_t
  cifs: Convert struct cifs_sb_info to use kuids and kgids
  cifs: Modify struct smb_vol to use kuids and kgids
  cifs: Convert struct cifsFileInfo to use a kuid
  cifs: Convert struct cifs_fattr to use kuid and kgids
  cifs: Convert struct tcon_link to use a kuid.
  cifs: Modify struct cifs_unix_set_info_args to hold a kuid_t and a kgid_t
  cifs: Convert from a kuid before printing current_fsuid
  cifs: Use kuids and kgids SID to uid/gid mapping
  cifs: Pass GLOBAL_ROOT_UID and GLOBAL_ROOT_GID to keyring_alloc
  cifs: Use BUILD_BUG_ON to validate uids and gids are the same size
  cifs: Override unmappable incoming uids and gids
  nfsd: Enable building with user namespaces enabled.
  nfsd: Properly compare and initialize kuids and kgids
  nfsd: Store ex_anon_uid and ex_anon_gid as kuids and kgids
  nfsd: Modify nfsd4_cb_sec to use kuids and kgids
  nfsd: Handle kuids and kgids in the nfs4acl to posix_acl conversion
  nfsd: Convert nfsxdr to use kuids and kgids
  nfsd: Convert nfs3xdr to use kuids and kgids
  ...

1 files changed, 55 insertions, 83 deletions

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 06122d09c0d1..c7c840e916f8 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -65,13 +65,10 @@
 #include "inode.h"
 #include "util.h"
 
-#define QUOTA_USER 1
-#define QUOTA_GROUP 0
-
 struct gfs2_quota_change_host {
         u64 qc_change;
         u32 qc_flags; /* GFS2_QCF_... */
-        u32 qc_id;
+        struct kqid qc_id;
 };
 
 static LIST_HEAD(qd_lru_list);
@@ -120,17 +117,24 @@ out:
         return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
 }
 
+static u64 qd2index(struct gfs2_quota_data *qd)
+{
+        struct kqid qid = qd->qd_id;
+        return (2 * (u64)from_kqid(&init_user_ns, qid)) +
+                (qid.type == USRQUOTA) ? 0 : 1;
+}
+
 static u64 qd2offset(struct gfs2_quota_data *qd)
 {
         u64 offset;
 
-        offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
+        offset = qd2index(qd);
         offset *= sizeof(struct gfs2_quota);
 
         return offset;
 }
 
-static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
+static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
                     struct gfs2_quota_data **qdp)
 {
         struct gfs2_quota_data *qd;
@@ -141,13 +145,11 @@ static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
                 return -ENOMEM;
 
         atomic_set(&qd->qd_count, 1);
-        qd->qd_id = id;
-        if (user)
-                set_bit(QDF_USER, &qd->qd_flags);
+        qd->qd_id = qid;
         qd->qd_slot = -1;
         INIT_LIST_HEAD(&qd->qd_reclaim);
 
-        error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
+        error = gfs2_glock_get(sdp, qd2index(qd),
                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
         if (error)
                 goto fail;
@@ -161,7 +163,7 @@ fail:
         return error;
 }
 
-static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
+static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
                   struct gfs2_quota_data **qdp)
 {
         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
@@ -173,8 +175,7 @@ static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
                 found = 0;
                 spin_lock(&qd_lru_lock);
                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
-                        if (qd->qd_id == id &&
-                            !test_bit(QDF_USER, &qd->qd_flags) == !user) {
+                        if (qid_eq(qd->qd_id, qid)) {
                                 if (!atomic_read(&qd->qd_count) &&
                                     !list_empty(&qd->qd_reclaim)) {
                                         /* Remove it from reclaim list */
@@ -208,7 +209,7 @@ static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
                         return 0;
                 }
 
-                error = qd_alloc(sdp, user, id, &new_qd);
+                error = qd_alloc(sdp, qid, &new_qd);
                 if (error)
                         return error;
         }
@@ -458,12 +459,12 @@ static void qd_unlock(struct gfs2_quota_data *qd)
         qd_put(qd);
 }
 
-static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
+static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
                     struct gfs2_quota_data **qdp)
 {
         int error;
 
-        error = qd_get(sdp, user, id, qdp);
+        error = qd_get(sdp, qid, qdp);
         if (error)
                 return error;
 
@@ -491,7 +492,7 @@ static void qdsb_put(struct gfs2_quota_data *qd)
         qd_put(qd);
 }
 
-int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
+int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 {
         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
         struct gfs2_quota_data **qd;
@@ -512,28 +513,30 @@ int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
                 return 0;
 
-        error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
+        error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
         if (error)
                 goto out;
         ip->i_res->rs_qa_qd_num++;
         qd++;
 
-        error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
+        error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
         if (error)
                 goto out;
         ip->i_res->rs_qa_qd_num++;
         qd++;
 
-        if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
-                error = qdsb_get(sdp, QUOTA_USER, uid, qd);
+        if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
+            !uid_eq(uid, ip->i_inode.i_uid)) {
+                error = qdsb_get(sdp, make_kqid_uid(uid), qd);
                 if (error)
                         goto out;
                 ip->i_res->rs_qa_qd_num++;
                 qd++;
         }
 
-        if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
-                error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
+        if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
+            !gid_eq(gid, ip->i_inode.i_gid)) {
+                error = qdsb_get(sdp, make_kqid_gid(gid), qd);
                 if (error)
                         goto out;
                 ip->i_res->rs_qa_qd_num++;
@@ -567,18 +570,10 @@ static int sort_qd(const void *a, const void *b)
         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
 
-        if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
-            !test_bit(QDF_USER, &qd_b->qd_flags)) {
-                if (test_bit(QDF_USER, &qd_a->qd_flags))
-                        return -1;
-                else
-                        return 1;
-        }
-        if (qd_a->qd_id < qd_b->qd_id)
+        if (qid_lt(qd_a->qd_id, qd_b->qd_id))
                 return -1;
-        if (qd_a->qd_id > qd_b->qd_id)
+        if (qid_lt(qd_b->qd_id, qd_a->qd_id))
                 return 1;
-
         return 0;
 }
 
@@ -595,9 +590,9 @@ static void do_qc(struct gfs2_quota_data *qd, s64 change)
         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
                 qc->qc_change = 0;
                 qc->qc_flags = 0;
-                if (test_bit(QDF_USER, &qd->qd_flags))
+                if (qd->qd_id.type == USRQUOTA)
                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
-                qc->qc_id = cpu_to_be32(qd->qd_id);
+                qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
         }
 
         x = be64_to_cpu(qc->qc_change) + change;
@@ -925,7 +920,7 @@ fail:
         return error;
 }
 
-int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
+int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 {
         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
         struct gfs2_quota_data *qd;
@@ -1040,13 +1035,13 @@ static int print_message(struct gfs2_quota_data *qd, char *type)
 
         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
                sdp->sd_fsname, type,
-               (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
-               qd->qd_id);
+               (qd->qd_id.type == USRQUOTA) ? "user" : "group",
+               from_kqid(&init_user_ns, qd->qd_id));
 
         return 0;
 }
 
-int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
+int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
 {
         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
         struct gfs2_quota_data *qd;
@@ -1063,8 +1058,8 @@ int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
                 qd = ip->i_res->rs_qa_qd[x];
 
-                if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
-                      (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
+                if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
+                      qid_eq(qd->qd_id, make_kqid_gid(gid))))
                         continue;
 
                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
@@ -1074,10 +1069,7 @@ int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
 
                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
                         print_message(qd, "exceeded");
-                        quota_send_warning(make_kqid(&init_user_ns,
-                                                     test_bit(QDF_USER, &qd->qd_flags) ?
-                                                     USRQUOTA : GRPQUOTA,
-                                                     qd->qd_id),
+                        quota_send_warning(qd->qd_id,
                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
 
                         error = -EDQUOT;
@@ -1087,10 +1079,7 @@ int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
                            time_after_eq(jiffies, qd->qd_last_warn +
                                          gfs2_tune_get(sdp,
                                                 gt_quota_warn_period) * HZ)) {
-                        quota_send_warning(make_kqid(&init_user_ns,
-                                                     test_bit(QDF_USER, &qd->qd_flags) ?
-                                                     USRQUOTA : GRPQUOTA,
-                                                     qd->qd_id),
+                        quota_send_warning(qd->qd_id,
                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
                         error = print_message(qd, "warning");
                         qd->qd_last_warn = jiffies;
@@ -1101,7 +1090,7 @@ int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
 }
 
 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
-                       u32 uid, u32 gid)
+                       kuid_t uid, kgid_t gid)
 {
         struct gfs2_quota_data *qd;
         unsigned int x;
@@ -1114,8 +1103,8 @@ void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
                 qd = ip->i_res->rs_qa_qd[x];
 
-                if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
-                    (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
+                if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
+                    qid_eq(qd->qd_id, make_kqid_gid(gid))) {
                         do_qc(qd, change);
                 }
         }
@@ -1170,13 +1159,13 @@ static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
         return gfs2_quota_sync(sb, type);
 }
 
-int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
+int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
 {
         struct gfs2_quota_data *qd;
         struct gfs2_holder q_gh;
         int error;
 
-        error = qd_get(sdp, user, id, &qd);
+        error = qd_get(sdp, qid, &qd);
         if (error)
                 return error;
 
@@ -1194,7 +1183,9 @@ static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *
 
         qc->qc_change = be64_to_cpu(str->qc_change);
         qc->qc_flags = be32_to_cpu(str->qc_flags);
-        qc->qc_id = be32_to_cpu(str->qc_id);
+        qc->qc_id = make_kqid(&init_user_ns,
+                              (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
+                              be32_to_cpu(str->qc_id));
 }
 
 int gfs2_quota_init(struct gfs2_sbd *sdp)
@@ -1257,8 +1248,7 @@ int gfs2_quota_init(struct gfs2_sbd *sdp)
                         if (!qc.qc_change)
                                 continue;
 
-                        error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
-                                         qc.qc_id, &qd);
+                        error = qd_alloc(sdp, qc.qc_id, &qd);
                         if (error) {
                                 brelse(bh);
                                 goto fail;
@@ -1485,21 +1475,17 @@ static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
         struct gfs2_quota_data *qd;
         struct gfs2_holder q_gh;
         int error;
-        int type;
 
         memset(fdq, 0, sizeof(struct fs_disk_quota));
 
         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
                 return -ESRCH; /* Crazy XFS error code */
 
-        if (qid.type == USRQUOTA)
-                type = QUOTA_USER;
-        else if (qid.type == GRPQUOTA)
-                type = QUOTA_GROUP;
-        else
+        if ((qid.type != USRQUOTA) &&
+            (qid.type != GRPQUOTA))
                 return -EINVAL;
 
-        error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
+        error = qd_get(sdp, qid, &qd);
         if (error)
                 return error;
         error = do_glock(qd, FORCE, &q_gh);
@@ -1508,8 +1494,8 @@ static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
 
         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
         fdq->d_version = FS_DQUOT_VERSION;
-        fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
-        fdq->d_id = from_kqid(&init_user_ns, qid);
+        fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
+        fdq->d_id = from_kqid_munged(current_user_ns(), qid);
         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
@@ -1535,32 +1521,18 @@ static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
         int alloc_required;
         loff_t offset;
         int error;
-        int type;
 
         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
                 return -ESRCH; /* Crazy XFS error code */
 
-        switch(qid.type) {
-        case USRQUOTA:
-                type = QUOTA_USER;
-                if (fdq->d_flags != FS_USER_QUOTA)
-                        return -EINVAL;
-                break;
-        case GRPQUOTA:
-                type = QUOTA_GROUP;
-                if (fdq->d_flags != FS_GROUP_QUOTA)
-                        return -EINVAL;
-                break;
-        default:
+        if ((qid.type != USRQUOTA) &&
+            (qid.type != GRPQUOTA))
                 return -EINVAL;
-        }
 
         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
                 return -EINVAL;
-        if (fdq->d_id != from_kqid(&init_user_ns, qid))
-                return -EINVAL;
 
-        error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
+        error = qd_get(sdp, qid, &qd);
         if (error)
                 return error;