On Mon, May 10, 2021 at 12:22:47PM -0500, YiFei Zhu wrote:
>
> +BPF_CALL_3(bpf_probe_read_user_dumpable, void *, dst, u32, size,
> + const void __user *, unsafe_ptr)
> +{
> + int ret = -EPERM;
> +
> + if (get_dumpable(current->mm))
> + ret = copy_from_user_nofault(dst, unsafe_ptr, size);
Could you explain a bit more how dumpable flag makes it safe for unpriv?
The unpriv prog is attached to the children tasks only, right?
and dumpable gets cleared if euid changes?
