userns: Convert ext4 to user kuid/kgid where appropriate
Eric W. Biederman [Tue, 7 Feb 2012 23:41:49 +0000 (15:41 -0800)]
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

fs/ext4/balloc.c
fs/ext4/ext4.h
fs/ext4/ialloc.c
fs/ext4/inode.c
fs/ext4/migrate.c
fs/ext4/super.c
include/trace/events/ext4.h
init/Kconfig

index 4bbd07a..c45c411 100644 (file)
@@ -461,8 +461,8 @@ static int ext4_has_free_clusters(struct ext4_sb_info *sbi,
                return 1;
 
        /* Hm, nope.  Are (enough) root reserved clusters available? */
-       if (sbi->s_resuid == current_fsuid() ||
-           ((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
+       if (uid_eq(sbi->s_resuid, current_fsuid()) ||
+           (!gid_eq(sbi->s_resgid, GLOBAL_ROOT_GID) && in_group_p(sbi->s_resgid)) ||
            capable(CAP_SYS_RESOURCE) ||
                (flags & EXT4_MB_USE_ROOT_BLOCKS)) {
 
index ab2594a..0b4aeb2 100644 (file)
@@ -1153,8 +1153,8 @@ struct ext4_sb_info {
        unsigned int s_mount_flags;
        unsigned int s_def_mount_opt;
        ext4_fsblk_t s_sb_block;
-       uid_t s_resuid;
-       gid_t s_resgid;
+       kuid_t s_resuid;
+       kgid_t s_resgid;
        unsigned short s_mount_state;
        unsigned short s_pad;
        int s_addr_per_block_bits;
index 409c2ee..9f9acac 100644 (file)
@@ -808,8 +808,8 @@ got:
        }
        if (owner) {
                inode->i_mode = mode;
-               inode->i_uid = owner[0];
-               inode->i_gid = owner[1];
+               i_uid_write(inode, owner[0]);
+               i_gid_write(inode, owner[1]);
        } else if (test_opt(sb, GRPID)) {
                inode->i_mode = mode;
                inode->i_uid = current_fsuid();
index c77b0bd..07eaf56 100644 (file)
@@ -3630,6 +3630,8 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
        journal_t *journal = EXT4_SB(sb)->s_journal;
        long ret;
        int block;
+       uid_t i_uid;
+       gid_t i_gid;
 
        inode = iget_locked(sb, ino);
        if (!inode)
@@ -3645,12 +3647,14 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
                goto bad_inode;
        raw_inode = ext4_raw_inode(&iloc);
        inode->i_mode = le16_to_cpu(raw_inode->i_mode);
-       inode->i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low);
-       inode->i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low);
+       i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low);
+       i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low);
        if (!(test_opt(inode->i_sb, NO_UID32))) {
-               inode->i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16;
-               inode->i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16;
+               i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16;
+               i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16;
        }
+       i_uid_write(inode, i_uid);
+       i_gid_write(inode, i_gid);
        set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
 
        ext4_clear_state_flags(ei);     /* Only relevant on 32-bit archs */
@@ -3870,6 +3874,8 @@ static int ext4_do_update_inode(handle_t *handle,
        struct ext4_inode_info *ei = EXT4_I(inode);
        struct buffer_head *bh = iloc->bh;
        int err = 0, rc, block;
+       uid_t i_uid;
+       gid_t i_gid;
 
        /* For fields not not tracking in the in-memory inode,
         * initialise them to zero for new inodes. */
@@ -3878,27 +3884,27 @@ static int ext4_do_update_inode(handle_t *handle,
 
        ext4_get_inode_flags(ei);
        raw_inode->i_mode = cpu_to_le16(inode->i_mode);
+       i_uid = i_uid_read(inode);
+       i_gid = i_gid_read(inode);
        if (!(test_opt(inode->i_sb, NO_UID32))) {
-               raw_inode->i_uid_low = cpu_to_le16(low_16_bits(inode->i_uid));
-               raw_inode->i_gid_low = cpu_to_le16(low_16_bits(inode->i_gid));
+               raw_inode->i_uid_low = cpu_to_le16(low_16_bits(i_uid));
+               raw_inode->i_gid_low = cpu_to_le16(low_16_bits(i_gid));
 /*
  * Fix up interoperability with old kernels. Otherwise, old inodes get
  * re-used with the upper 16 bits of the uid/gid intact
  */
                if (!ei->i_dtime) {
                        raw_inode->i_uid_high =
-                               cpu_to_le16(high_16_bits(inode->i_uid));
+                               cpu_to_le16(high_16_bits(i_uid));
                        raw_inode->i_gid_high =
-                               cpu_to_le16(high_16_bits(inode->i_gid));
+                               cpu_to_le16(high_16_bits(i_gid));
                } else {
                        raw_inode->i_uid_high = 0;
                        raw_inode->i_gid_high = 0;
                }
        } else {
-               raw_inode->i_uid_low =
-                       cpu_to_le16(fs_high2lowuid(inode->i_uid));
-               raw_inode->i_gid_low =
-                       cpu_to_le16(fs_high2lowgid(inode->i_gid));
+               raw_inode->i_uid_low = cpu_to_le16(fs_high2lowuid(i_uid));
+               raw_inode->i_gid_low = cpu_to_le16(fs_high2lowgid(i_gid));
                raw_inode->i_uid_high = 0;
                raw_inode->i_gid_high = 0;
        }
@@ -4084,8 +4090,8 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 
        if (is_quota_modification(inode, attr))
                dquot_initialize(inode);
-       if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
-               (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
+       if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
+           (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
                handle_t *handle;
 
                /* (user+group)*(old+new) structure, inode write (sb,
index f39f80f..f1bb32e 100644 (file)
@@ -466,8 +466,8 @@ int ext4_ext_migrate(struct inode *inode)
        }
        goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
                EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
-       owner[0] = inode->i_uid;
-       owner[1] = inode->i_gid;
+       owner[0] = i_uid_read(inode);
+       owner[1] = i_gid_read(inode);
        tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
                                   S_IFREG, NULL, goal, owner);
        if (IS_ERR(tmp_inode)) {
index ceebaf8..9d8eba0 100644 (file)
@@ -1448,6 +1448,8 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
 {
        struct ext4_sb_info *sbi = EXT4_SB(sb);
        const struct mount_opts *m;
+       kuid_t uid;
+       kgid_t gid;
        int arg = 0;
 
        if (args->from && match_int(args, &arg))
@@ -1464,10 +1466,20 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
                         "Ignoring removed %s option", opt);
                return 1;
        case Opt_resuid:
-               sbi->s_resuid = arg;
+               uid = make_kuid(current_user_ns(), arg);
+               if (!uid_valid(uid)) {
+                       ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
+                       return -1;
+               }
+               sbi->s_resuid = uid;
                return 1;
        case Opt_resgid:
-               sbi->s_resgid = arg;
+               gid = make_kgid(current_user_ns(), arg);
+               if (!gid_valid(gid)) {
+                       ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
+                       return -1;
+               }
+               sbi->s_resgid = gid;
                return 1;
        case Opt_abort:
                sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
@@ -1732,12 +1744,14 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
                SEQ_OPTS_PRINT("%s", token2str(m->token));
        }
 
-       if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
+       if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
            le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
-               SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
-       if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
+               SEQ_OPTS_PRINT("resuid=%u",
+                               from_kuid_munged(&init_user_ns, sbi->s_resuid));
+       if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
            le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
-               SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
+               SEQ_OPTS_PRINT("resgid=%u",
+                               from_kgid_munged(&init_user_ns, sbi->s_resgid));
        def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
        if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
                SEQ_OPTS_PUTS("errors=remount-ro");
@@ -2996,8 +3010,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
        }
        sb->s_fs_info = sbi;
        sbi->s_mount_opt = 0;
-       sbi->s_resuid = EXT4_DEF_RESUID;
-       sbi->s_resgid = EXT4_DEF_RESGID;
+       sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
+       sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
        sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
        sbi->s_sb_block = sb_block;
        if (sb->s_bdev->bd_part)
@@ -3076,8 +3090,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
        if (def_mount_opts & EXT4_DEFM_DISCARD)
                set_opt(sb, DISCARD);
 
-       sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
-       sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
+       sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
+       sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
        sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
        sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
        sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
@@ -4229,8 +4243,8 @@ static int ext4_unfreeze(struct super_block *sb)
 struct ext4_mount_options {
        unsigned long s_mount_opt;
        unsigned long s_mount_opt2;
-       uid_t s_resuid;
-       gid_t s_resgid;
+       kuid_t s_resuid;
+       kgid_t s_resgid;
        unsigned long s_commit_interval;
        u32 s_min_batch_time, s_max_batch_time;
 #ifdef CONFIG_QUOTA
index 319538b..69d8a69 100644 (file)
@@ -36,8 +36,8 @@ TRACE_EVENT(ext4_free_inode,
                __entry->dev    = inode->i_sb->s_dev;
                __entry->ino    = inode->i_ino;
                __entry->mode   = inode->i_mode;
-               __entry->uid    = inode->i_uid;
-               __entry->gid    = inode->i_gid;
+               __entry->uid    = i_uid_read(inode);
+               __entry->gid    = i_gid_read(inode);
                __entry->blocks = inode->i_blocks;
        ),
 
index 669f991..0e7d30b 100644 (file)
@@ -929,7 +929,6 @@ config UIDGID_CONVERTED
        depends on ECRYPT_FS = n
        depends on EFS_FS = n
        depends on EXOFS_FS = n
-       depends on EXT4_FS = n
        depends on FAT_FS = n
        depends on FUSE_FS = n
        depends on GFS2_FS = n