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userns: Convert ext3 to use kuid/kgid where appropriate 

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-02-07 15:41:24 -08:00
parent b8a9f9e183
commit 1523299d58
6 changed files with 54 additions and 31 deletions
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5
fs/ext3/balloc.c
View File

@ -1439,8 +1439,9 @@ static int ext3_has_free_blocks(struct ext3_sb_info *sbi, int use_reservation)
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) &&
!use_reservation && sbi->s_resuid != current_fsuid() &&
(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
!use_reservation && !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;

8
fs/ext3/ext3.h
View File

@ -243,8 +243,8 @@ struct ext3_new_group_data {
*/
struct ext3_mount_options {
unsigned long s_mount_opt;
uid_t s_resuid;
gid_t s_resgid;
kuid_t s_resuid;
kgid_t s_resgid;
unsigned long s_commit_interval;
#ifdef CONFIG_QUOTA
int s_jquota_fmt;
@ -637,8 +637,8 @@ struct ext3_sb_info {
struct buffer_head ** s_group_desc;
unsigned long s_mount_opt;
ext3_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;

32
fs/ext3/inode.c
View File

@ -2891,6 +2891,8 @@ struct inode *ext3_iget(struct super_block *sb, unsigned long ino)
transaction_t *transaction;
long ret;
int block;
uid_t i_uid;
gid_t i_gid;
inode = iget_locked(sb, ino);
if (!inode)
@ -2907,12 +2909,14 @@ struct inode *ext3_iget(struct super_block *sb, unsigned long ino)
bh = iloc.bh;
raw_inode = ext3_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));
inode->i_size = le32_to_cpu(raw_inode->i_size);
inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime);
@ -3068,6 +3072,8 @@ static int ext3_do_update_inode(handle_t *handle,
struct ext3_inode_info *ei = EXT3_I(inode);
struct buffer_head *bh = iloc->bh;
int err = 0, rc, block;
uid_t i_uid;
gid_t i_gid;
again:
/* we can't allow multiple procs in here at once, its a bit racey */
@ -3080,27 +3086,29 @@ again:
ext3_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));
cpu_to_le16(fs_high2lowuid(i_uid));
raw_inode->i_gid_low =
cpu_to_le16(fs_high2lowgid(inode->i_gid));
cpu_to_le16(fs_high2lowgid(i_gid));
raw_inode->i_uid_high = 0;
raw_inode->i_gid_high = 0;
}
@ -3262,8 +3270,8 @@ int ext3_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,

35
fs/ext3/super.c
View File

@ -617,13 +617,15 @@ static int ext3_show_options(struct seq_file *seq, struct dentry *root)
seq_puts(seq, ",grpid");
if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
seq_puts(seq, ",nogrpid");
if (sbi->s_resuid != EXT3_DEF_RESUID ||
if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
le16_to_cpu(es->s_def_resuid) != EXT3_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 != EXT3_DEF_RESGID ||
if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
le16_to_cpu(es->s_def_resgid) != EXT3_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);
@ -967,6 +969,8 @@ static int parse_options (char *options, struct super_block *sb,
substring_t args[MAX_OPT_ARGS];
int data_opt = 0;
int option;
kuid_t uid;
kgid_t gid;
#ifdef CONFIG_QUOTA
int qfmt;
#endif
@ -1000,12 +1004,23 @@ 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)) {
ext3_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)) {
ext3_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 */
@ -1651,8 +1666,8 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
}
sb->s_fs_info = sbi;
sbi->s_mount_opt = 0;
sbi->s_resuid = EXT3_DEF_RESUID;
sbi->s_resgid = EXT3_DEF_RESGID;
sbi->s_resuid = make_kuid(&init_user_ns, EXT3_DEF_RESUID);
sbi->s_resgid = make_kgid(&init_user_ns, EXT3_DEF_RESGID);
sbi->s_sb_block = sb_block;
blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
@ -1716,8 +1731,8 @@ static int ext3_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));
/* enable barriers by default */
set_opt(sbi->s_mount_opt, BARRIER);

4
include/trace/events/ext3.h
View File

@ -24,8 +24,8 @@ TRACE_EVENT(ext3_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;
),

1
init/Kconfig
View 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 EXT3_FS = n
depends on EXT4_FS = n
depends on FAT_FS = n
depends on FUSE_FS = n