Messages in this thread | | | From | Jeff Moyer <> | Subject | Re: [PATCH 2/3] libnvdimm/security: Tighten scope of nvdimm->busy vs security operations | Date | Mon, 19 Aug 2019 10:32:22 -0400 |
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Dan Williams <dan.j.williams@intel.com> writes:
> On Fri, Aug 16, 2019 at 1:49 PM Jeff Moyer <jmoyer@redhat.com> wrote: >> >> Dan Williams <dan.j.williams@intel.com> writes: >> >> > The blanket blocking of all security operations while the DIMM is in >> > active use in a region is too restrictive. The only security operations >> > that need to be aware of the ->busy state are those that mutate the >> > state of data, i.e. erase and overwrite. >> > >> > Refactor the ->busy checks to be applied at the entry common entry point >> > in __security_store() rather than each of the helper routines. >> >> I'm not sure this buys you much. Did you test this on actual hardware >> to make sure your assumptions are correct? I guess the worst case is we >> get an "invalid security state" error back from the firmware.... >> >> Still, what's the motivation for this? > > The motivation was when I went to test setting the frozen state and > found that it complained about the DIMM being active. There's nothing > wrong with freezing security while the DIMM is mapped. ...but then I > somehow managed to write this generalized commit message that left out > the explicit failure I was worried about. Yes, moved too fast, but the > motivation is "allow freeze while active" and centralize the ->busy > check so it's just one function to review that common constraint.
OK, thanks for the info.
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
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