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authorEric W. Biederman <ebiederm@xmission.com>2012-09-10 20:44:54 -0700
committerEric W. Biederman <ebiederm@xmission.com>2012-09-18 01:01:36 -0700
commitaf84df93ffe3603fc6fc40a4338f9e740aad3b4e (patch)
tree872cd463edcf18c4caba8eb218e0581c2cd91c76 /fs/ext4/acl.c
parent5f3a4a28ec140a90e6058d1d09f6b1f235d485e5 (diff)
downloadlinux-af84df93ffe3603fc6fc40a4338f9e740aad3b4e.tar.bz2
userns: Convert extN to support kuids and kgids in posix acls
Convert ext2, ext3, and ext4 to fully support the posix acl changes, using e_uid e_gid instead e_id. Enabled building with posix acls enabled, all filesystems supporting user namespaces, now also support posix acls when user namespaces are enabled. Cc: Theodore Tso <tytso@mit.edu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Jan Kara <jack@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'fs/ext4/acl.c')
-rw-r--r--fs/ext4/acl.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 42b95fccfb2f..d3c5b88fd89f 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -55,16 +55,23 @@ ext4_acl_from_disk(const void *value, size_t size)
case ACL_OTHER:
value = (char *)value +
sizeof(ext4_acl_entry_short);
- acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
break;
case ACL_USER:
+ value = (char *)value + sizeof(ext4_acl_entry);
+ if ((char *)value > end)
+ goto fail;
+ acl->a_entries[n].e_uid =
+ make_kuid(&init_user_ns,
+ le32_to_cpu(entry->e_id));
+ break;
case ACL_GROUP:
value = (char *)value + sizeof(ext4_acl_entry);
if ((char *)value > end)
goto fail;
- acl->a_entries[n].e_id =
- le32_to_cpu(entry->e_id);
+ acl->a_entries[n].e_gid =
+ make_kgid(&init_user_ns,
+ le32_to_cpu(entry->e_id));
break;
default:
@@ -98,13 +105,19 @@ ext4_acl_to_disk(const struct posix_acl *acl, size_t *size)
ext_acl->a_version = cpu_to_le32(EXT4_ACL_VERSION);
e = (char *)ext_acl + sizeof(ext4_acl_header);
for (n = 0; n < acl->a_count; n++) {
+ const struct posix_acl_entry *acl_e = &acl->a_entries[n];
ext4_acl_entry *entry = (ext4_acl_entry *)e;
- entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
- entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
- switch (acl->a_entries[n].e_tag) {
+ entry->e_tag = cpu_to_le16(acl_e->e_tag);
+ entry->e_perm = cpu_to_le16(acl_e->e_perm);
+ switch (acl_e->e_tag) {
case ACL_USER:
+ entry->e_id = cpu_to_le32(
+ from_kuid(&init_user_ns, acl_e->e_uid));
+ e += sizeof(ext4_acl_entry);
+ break;
case ACL_GROUP:
- entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
+ entry->e_id = cpu_to_le32(
+ from_kgid(&init_user_ns, acl_e->e_gid));
e += sizeof(ext4_acl_entry);
break;