Kdump with signed images

Vivek Goyal vgoyal at redhat.com
Fri Nov 2 09:23:19 EDT 2012

On Thu, Nov 01, 2012 at 02:52:25PM +0000, Matthew Garrett wrote:
> On Thu, Nov 01, 2012 at 10:43:04AM -0400, Vivek Goyal wrote:
> > So I think this does satisfy the requirement matthew specified. Isn't it?
> > Matthew, what do you think?
> Sure, if you can ensure that. You'll need to figure out how to get the 
> build system to sign the userspace binaries and you'll need to ensure 
> that they're statically linked and don't dlopen anything (including the 
> nsswitch modules), but otherwise that should work.

[ CC peter jones ]

Ok, so even if we build kexec-tools statically with glibc, we have the
issue of name service switch modules. glibc will still do dlopen on
these modules. So what are options now.

- Sign glibc and associated shared libraries. Do not allow unsigned
  shared library to dynamically link with signed executable.

- Peter mentioned that work with uClibc for kexec-tools.

I personally think that however hard it is but first option sounds like
a long term solution. We might have more user space processes which
we might have to trust a generic solution will help with that. For example,
we might have to sign and trust qemu at some point of time.

Are there other ways of handing glibc issue?


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