I noticed that there are differences in the behavior of listxattr(2) for xattrs in the trusted namespace. Some filesystems, such as ext[234], require CAP_SYS_ADMIN for this, i.e. trusted xattr names are hidden from unprivileged users. I audited the kernel for users of the trusted xattr namespace, and found the following filesystems not checking for CAP_SYS_ADMIN: - jffs2 - ocfs2 - btrfs - xfs I've created patches for jffs2 (tested) and ocfs2 (not tested) to add the check -- see following emails. btrfs and xfs have custom listxattr operations and will need a bit more work to fix. I'm not sure what the initial intention was for the behavior, although given that several major filesystems are have been fielded with the CAP_SYS_ADMIN check, it seems most prudent to make this the standard behavior for all filesystems, in case any users are depending on it. Thoughts? - James -- James Morris <jmorris@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
