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Commit b8a9f9e1 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

userns: Convert ext2 to use kuid/kgid where appropriate. 



Acked-by: default avatarSerge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
parent f04c6ce2

fs/ext2/balloc.c

+3 −2
Original line number Diff line number Diff line
@@ -1193,8 +1193,9 @@ static int ext2_has_free_blocks(struct ext2_sb_info *sbi) 
	free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);

	root_blocks = le32_to_cpu(sbi->s_es->s_r_blocks_count);

	if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&

		sbi->s_resuid != current_fsuid() &&

		(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {

		!uid_eq(sbi->s_resuid, current_fsuid()) &&

		(gid_eq(sbi->s_resgid, GLOBAL_ROOT_GID) ||

		 !in_group_p (sbi->s_resgid))) {

		return 0;

	}

	return 1;

fs/ext2/ext2.h

+4 −4
Original line number Diff line number Diff line
@@ -82,8 +82,8 @@ struct ext2_sb_info { 
	struct buffer_head ** s_group_desc;

	unsigned long  s_mount_opt;

	unsigned long 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;
@@ -637,8 +637,8 @@ static inline void verify_offsets(void) 
 */

struct ext2_mount_options {

	unsigned long s_mount_opt;

	uid_t s_resuid;

	gid_t s_resgid;

	kuid_t s_resuid;

	kgid_t s_resgid;

};



/*

fs/ext2/inode.c

+12 −8
Original line number Diff line number Diff line
@@ -1293,6 +1293,8 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino) 
	struct inode *inode;

	long ret = -EIO;

	int n;

	uid_t i_uid;

	gid_t i_gid;



	inode = iget_locked(sb, ino);

	if (!inode)
@@ -1310,12 +1312,14 @@ struct inode *ext2_iget (struct super_block *sb, unsigned long ino) 
	}



	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));

	inode->i_size = le32_to_cpu(raw_inode->i_size);

	inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime);
@@ -1413,8 +1417,8 @@ static int __ext2_write_inode(struct inode *inode, int do_sync) 
	struct ext2_inode_info *ei = EXT2_I(inode);

	struct super_block *sb = inode->i_sb;

	ino_t ino = inode->i_ino;

	uid_t uid = inode->i_uid;

	gid_t gid = inode->i_gid;

	uid_t uid = i_uid_read(inode);

	gid_t gid = i_gid_read(inode);

	struct buffer_head * bh;

	struct ext2_inode * raw_inode = ext2_get_inode(sb, ino, &bh);

	int n;
@@ -1529,8 +1533,8 @@ int ext2_setattr(struct dentry *dentry, struct iattr *iattr) 


	if (is_quota_modification(inode, iattr))

		dquot_initialize(inode);

	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||

	    (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {

	if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||

	    (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {

		error = dquot_transfer(inode, iattr);

		if (error)

			return error;

fs/ext2/super.c

+23 −8
Original line number Diff line number Diff line
@@ -228,13 +228,15 @@ static int ext2_show_options(struct seq_file *seq, struct dentry *root) 
		seq_puts(seq, ",grpid");

	if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))

		seq_puts(seq, ",nogrpid");

	if (sbi->s_resuid != EXT2_DEF_RESUID ||

	if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||

	    le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {

		seq_printf(seq, ",resuid=%u", sbi->s_resuid);

		seq_printf(seq, ",resuid=%u",

				from_kuid_munged(&init_user_ns, sbi->s_resuid));

	}

	if (sbi->s_resgid != EXT2_DEF_RESGID ||

	if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||

	    le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {

		seq_printf(seq, ",resgid=%u", sbi->s_resgid);

		seq_printf(seq, ",resgid=%u",

				from_kgid_munged(&init_user_ns, sbi->s_resgid));

	}

	if (test_opt(sb, ERRORS_RO)) {

		int def_errors = le16_to_cpu(es->s_errors);
@@ -436,6 +438,8 @@ static int parse_options(char *options, struct super_block *sb) 
	struct ext2_sb_info *sbi = EXT2_SB(sb);

	substring_t args[MAX_OPT_ARGS];

	int option;

	kuid_t uid;

	kgid_t gid;



	if (!options)

		return 1;
@@ -462,12 +466,23 @@ static int parse_options(char *options, struct super_block *sb) 
		case Opt_resuid:

			if (match_int(&args[0], &option))

				return 0;

			sbi->s_resuid = option;

			uid = make_kuid(current_user_ns(), option);

			if (!uid_valid(uid)) {

				ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);

				return -1;



			}

			sbi->s_resuid = uid;

			break;

		case Opt_resgid:

			if (match_int(&args[0], &option))

				return 0;

			sbi->s_resgid = option;

			gid = make_kgid(current_user_ns(), option);

			if (!gid_valid(gid)) {

				ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);

				return -1;

			}

			sbi->s_resgid = gid;

			break;

		case Opt_sb:

			/* handled by get_sb_block() instead of here */
@@ -841,8 +856,8 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent) 
	else

		set_opt(sbi->s_mount_opt, ERRORS_RO);



	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));

	

	set_opt(sbi->s_mount_opt, RESERVATION);

init/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -929,7 +929,6 @@ config UIDGID_CONVERTED 
	depends on ECRYPT_FS = n

	depends on EFS_FS = n

	depends on EXOFS_FS = n

	depends on EXT2_FS = n

	depends on EXT3_FS = n

	depends on EXT4_FS = n

	depends on FAT_FS = n