userns: Convert hpfs to use kuid and kgid where appropriate

Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

4 files changed, 28 insertions, 21 deletions

diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index ac1ead194db..7102aaecc24 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -63,8 +63,8 @@ struct hpfs_sb_info {
         unsigned sb_dmap;               /* sector number of dnode bit map */
         unsigned sb_n_free;             /* free blocks for statfs, or -1 */
         unsigned sb_n_free_dnodes;      /* free dnodes for statfs, or -1 */
-        uid_t sb_uid;                   /* uid from mount options */
-        gid_t sb_gid;                   /* gid from mount options */
+        kuid_t sb_uid;                  /* uid from mount options */
+        kgid_t sb_gid;                  /* gid from mount options */
         umode_t sb_mode;                /* mode from mount options */
         unsigned sb_eas : 2;            /* eas: 0-ignore, 1-ro, 2-rw */
         unsigned sb_err : 2;            /* on errs: 0-cont, 1-ro, 2-panic */
diff --git a/fs/hpfs/inode.c b/fs/hpfs/inode.c
index ed671e0ea78..804a9a842cb 100644
--- a/fs/hpfs/inode.c
+++ b/fs/hpfs/inode.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/user_namespace.h>
 #include "hpfs_fn.h"
 
 void hpfs_init_inode(struct inode *i)
@@ -60,14 +61,14 @@ void hpfs_read_inode(struct inode *i)
         if (hpfs_sb(i->i_sb)->sb_eas) {
                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
                         if (ea_size == 2) {
-                                i->i_uid = le16_to_cpu(*(__le16*)ea);
+                                i_uid_write(i, le16_to_cpu(*(__le16*)ea));
                                 hpfs_inode->i_ea_uid = 1;
                         }
                         kfree(ea);
                 }
                 if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
                         if (ea_size == 2) {
-                                i->i_gid = le16_to_cpu(*(__le16*)ea);
+                                i_gid_write(i, le16_to_cpu(*(__le16*)ea));
                                 hpfs_inode->i_ea_gid = 1;
                         }
                         kfree(ea);
@@ -149,13 +150,13 @@ static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
                 hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
         } else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) {
                 __le32 ea;
-                if ((i->i_uid != hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
-                        ea = cpu_to_le32(i->i_uid);
+                if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) {
+                        ea = cpu_to_le32(i_uid_read(i));
                         hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2);
                         hpfs_inode->i_ea_uid = 1;
                 }
-                if ((i->i_gid != hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
-                        ea = cpu_to_le32(i->i_gid);
+                if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) {
+                        ea = cpu_to_le32(i_gid_read(i));
                         hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2);
                         hpfs_inode->i_ea_gid = 1;
                 }
@@ -261,9 +262,11 @@ int hpfs_setattr(struct dentry *dentry, struct iattr *attr)
         hpfs_lock(inode->i_sb);
         if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root)
                 goto out_unlock;
-        if ((attr->ia_valid & ATTR_UID) && attr->ia_uid >= 0x10000)
+        if ((attr->ia_valid & ATTR_UID) &&
+            from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000)
                 goto out_unlock;
-        if ((attr->ia_valid & ATTR_GID) && attr->ia_gid >= 0x10000)
+        if ((attr->ia_valid & ATTR_GID) &&
+            from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000)
                 goto out_unlock;
         if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size)
                 goto out_unlock;
diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
index bc9082482f6..345713d2f8f 100644
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -91,8 +91,8 @@ static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
         inc_nlink(dir);
         insert_inode_hash(result);
 
-        if (result->i_uid != current_fsuid() ||
-            result->i_gid != current_fsgid() ||
+        if (!uid_eq(result->i_uid, current_fsuid()) ||
+            !gid_eq(result->i_gid, current_fsgid()) ||
             result->i_mode != (mode | S_IFDIR)) {
                 result->i_uid = current_fsuid();
                 result->i_gid = current_fsgid();
@@ -179,8 +179,8 @@ static int hpfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, b
 
         insert_inode_hash(result);
 
-        if (result->i_uid != current_fsuid() ||
-            result->i_gid != current_fsgid() ||
+        if (!uid_eq(result->i_uid, current_fsuid()) ||
+            !gid_eq(result->i_gid, current_fsgid()) ||
             result->i_mode != (mode | S_IFREG)) {
                 result->i_uid = current_fsuid();
                 result->i_gid = current_fsgid();
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 706a12c083e..a152783602d 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -251,7 +251,7 @@ static const match_table_t tokens = {
         {Opt_err, NULL},
 };
 
-static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
+static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
                       int *lowercase, int *eas, int *chk, int *errs,
                       int *chkdsk, int *timeshift)
 {
@@ -276,12 +276,16 @@ static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
                 case Opt_uid:
                         if (match_int(args, &option))
                                 return 0;
-                        *uid = option;
+                        *uid = make_kuid(current_user_ns(), option);
+                        if (!uid_valid(*uid))
+                                return 0;
                         break;
                 case Opt_gid:
                         if (match_int(args, &option))
                                 return 0;
-                        *gid = option;
+                        *gid = make_kgid(current_user_ns(), option);
+                        if (!gid_valid(*gid))
+                                return 0;
                         break;
                 case Opt_umask:
                         if (match_octal(args, &option))
@@ -378,8 +382,8 @@ HPFS filesystem options:\n\
 
 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 {
-        uid_t uid;
-        gid_t gid;
+        kuid_t uid;
+        kgid_t gid;
         umode_t umask;
         int lowercase, eas, chk, errs, chkdsk, timeshift;
         int o;
@@ -455,8 +459,8 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
         struct hpfs_sb_info *sbi;
         struct inode *root;
 
-        uid_t uid;
-        gid_t gid;
+        kuid_t uid;
+        kgid_t gid;
         umode_t umask;
         int lowercase, eas, chk, errs, chkdsk, timeshift;