+static bool chown_ok(const struct inode *inode, kuid_t uid)
+{
+ if (uid_eq(current_fsuid(), inode->i_uid) &&
+ uid_eq(uid, inode->i_uid))
+ return true;
+ if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
+ return true;
+ if (ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
+ return true;
+ return false;
+}
+
+static bool chgrp_ok(const struct inode *inode, kgid_t gid)
+{
+ if (uid_eq(current_fsuid(), inode->i_uid) &&
+ (in_group_p(gid) || gid_eq(gid, inode->i_gid)))
+ return true;
+ if (capable_wrt_inode_uidgid(inode, CAP_CHOWN))
+ return true;
+ if (ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
+ return true;
+ return false;
+}
+