[GIT PULL] Kernel lockdown for secure boot
Alexei Starovoitov
alexei.starovoitov at gmail.com
Mon Apr 9 03:40:10 UTC 2018
On Sun, Apr 08, 2018 at 04:07:42PM +0800, joeyli wrote:
>
> > If the only thing that folks are paranoid about is reading
> > arbitrary kernel memory with bpf_probe_read() helper
> > then preferred patch would be to disable it during verification
> > when in lockdown mode
>
> Sorry for I didn't fully understand your idea...
> Do you mean that using bpf verifier to filter out bpf program that
> uses bpf_probe_read()?
Take a look bpf_get_trace_printk_proto().
Similarly we can add bpf_get_probe_read_proto() that
will return NULL if lockdown is on.
Then programs with bpf_probe_read() will be rejected by the verifier.
--
To unsubscribe from this list: send the line "unsubscribe linux-security-module" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
More information about the Linux-security-module-archive
mailing list