On Fri, Nov 15, 2013 at 10:33:04AM -0800, Kees Cook wrote:
>
> When the static stack canary was mentioned during the ARM summit, I
> dug around a little bit and saw that at very early boot, yes, it was
> always the same, but after boot finished, it was different from boot
> to boot. I didn't get far enough to figure out what was changing it
> later on.
I've been in Seoul this past week, so I haven't had a chance look more
closely at this, but what's not clear to me what the impact will be of
having a static statck canary during early boot. Does that mean the
stack canary for the certain kernel threads and the pid 1 are always
constant, since their stacks are getting set up before we're actually
able to initialize the stack canary with something random?
- Ted
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