Re: kexec_load(2) bypasses signature verification

From	Dave Young <dyoung@redhat.com>
Newsgroups	linux.kernel
Subject	Re: kexec_load(2) bypasses signature verification
Date	2015-06-18 03:30 +0200
Message-ID	<pCwOt-1XL-3@gated-at.bofh.it> (permalink)
References	<pBtJ0-8R-3@gated-at.bofh.it> <pBBwR-34f-1@gated-at.bofh.it> <pBCsW-4pR-23@gated-at.bofh.it> <pBCMi-4N0-23@gated-at.bofh.it> <pBIRI-5m8-3@gated-at.bofh.it>
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On 06/15/15 at 04:01pm, Theodore Ts'o wrote:
> On Mon, Jun 15, 2015 at 09:37:05AM -0400, Josh Boyer wrote:
> > The bits that actually read Secure Boot state out of the UEFI
> > variables, and apply protections to the machine to avoid compromise
> > under the SB threat model.  Things like disabling the old kexec...
> 
> I don't have any real interest in using Secure Boot, but I *am*
> interested in using CONFIG_KEXEC_VERIFY_SIG[1].  So perhaps we need to
> have something similar to what we have with signed modules in terms of
> CONFIG_MODULE_SIG_FORCE and module/sig_enforce, but for
> KEXEC_VERIFY_SIG.  This would mean creating a separate flag
> independent of the one Linus suggested for Secure Boot, but since we
> have one for signed modules, we do have precedent for this sort of
> thing.

Agree and vote for this way as I replied in another email about
CONFIG_KEXEC_VERIFY_SIG_FORCE.

Thanks
Dave
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Thread

kexec_load(2) bypasses signature verification Theodore Ts'o <tytso@mit.edu> - 2015-06-15 06:00 +0200
  Re: kexec_load(2) bypasses signature verification Theodore Ts'o <tytso@mit.edu> - 2015-06-15 22:10 +0200
    Re: kexec_load(2) bypasses signature verification ebiederm@xmission.com (Eric W. Biederman) - 2015-06-16 21:50 +0200
      Re: kexec_load(2) bypasses signature verification Vivek Goyal <vgoyal@redhat.com> - 2015-06-16 22:30 +0200
        Re: kexec_load(2) bypasses signature verification Dave Young <dyoung@redhat.com> - 2015-06-18 03:20 +0200
          Re: kexec_load(2) bypasses signature verification Dave Young <dyoung@redhat.com> - 2015-06-18 04:10 +0200
            Re: kexec_load(2) bypasses signature verification Dave Young <dyoung@redhat.com> - 2015-06-19 08:30 +0200
              Re: kexec_load(2) bypasses signature verification Dave Young <dyoung@redhat.com> - 2015-06-19 10:20 +0200
                Re: kexec_load(2) bypasses signature verification Vivek Goyal <vgoyal@redhat.com> - 2015-06-19 15:10 +0200
        Re: kexec_load(2) bypasses signature verification Dave Young <dyoung@redhat.com> - 2015-06-19 09:10 +0200
          Re: kexec_load(2) bypasses signature verification Vivek Goyal <vgoyal@redhat.com> - 2015-06-19 15:10 +0200
    Re: kexec_load(2) bypasses signature verification Dave Young <dyoung@redhat.com> - 2015-06-18 03:30 +0200

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