userns: Convert ext2 to use kuid/kgid where appropriate.
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index a8cbe1b..030c6d2 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1193,8 +1193,9 @@
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;
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 0b2b4db..d9a17d0 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -82,8 +82,8 @@
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 @@
*/
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;
};
/*
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 740cad8..f9fa95f 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1293,6 +1293,8 @@
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 @@
}
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 @@
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 @@
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;
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index e1025c7..38f8160 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -228,13 +228,15 @@
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 @@
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 @@
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 @@
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);
diff --git a/init/Kconfig b/init/Kconfig
index 2738a7c..769d9a4 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -929,7 +929,6 @@
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
