userns: Convert ext4 to user 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/ext4/super.c b/fs/ext4/super.c
index ceebaf8..9d8eba0 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1448,6 +1448,8 @@
{
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 @@
"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 @@
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 @@
}
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 @@
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 @@
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