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xfs: convert kuid_t to/from uid_t in ACLs 

Change permission check for setting ACL to use inode_owner_or_capable()
which will additionally allow a CAP_FOWNER user in a user namespace to
be able to set an ACL on an inode covered by the user namespace mapping.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dwight Engen 2013-08-15 14:07:59 -04:00 committed by Ben Myers
parent c5eeb7ec3e
commit 288bbe0eeb
1 changed files with 16 additions and 4 deletions
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20
fs/xfs/xfs_acl.c
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@ -70,14 +70,15 @@ xfs_acl_from_disk(
switch (acl_e->e_tag) {
case ACL_USER:
acl_e->e_uid = xfs_uid_to_kuid(be32_to_cpu(ace->ae_id));
break;
case ACL_GROUP:
acl_e->e_id = be32_to_cpu(ace->ae_id);
acl_e->e_gid = xfs_gid_to_kgid(be32_to_cpu(ace->ae_id));
break;
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
acl_e->e_id = ACL_UNDEFINED_ID;
break;
default:
goto fail;
@ -103,7 +104,18 @@ xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
acl_e = &acl->a_entries[i];
ace->ae_tag = cpu_to_be32(acl_e->e_tag);
ace->ae_id = cpu_to_be32(acl_e->e_id);
switch (acl_e->e_tag) {
case ACL_USER:
ace->ae_id = cpu_to_be32(xfs_kuid_to_uid(acl_e->e_uid));
break;
case ACL_GROUP:
ace->ae_id = cpu_to_be32(xfs_kgid_to_gid(acl_e->e_gid));
break;
default:
ace->ae_id = cpu_to_be32(ACL_UNDEFINED_ID);
break;
}
ace->ae_perm = cpu_to_be16(acl_e->e_perm);
}
}
@ -362,7 +374,7 @@ xfs_xattr_acl_set(struct dentry *dentry, const char *name,
return -EINVAL;
if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
return value ? -EACCES : 0;
if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
if (!inode_owner_or_capable(inode))
return -EPERM;
if (!value)