Re: [PATCH] arm: Use kernel mm when updating section permissions

From: Kevin Hilman
Date: Fri Nov 06 2015 - 18:06:08 EST

On Fri, Nov 6, 2015 at 2:37 PM, Kevin Hilman <khilman@xxxxxxxxxx> wrote:
> Kees Cook <keescook@xxxxxxxxxxxx> writes:
>> On Fri, Nov 6, 2015 at 1:06 PM, Kevin Hilman <khilman@xxxxxxxxxx> wrote:
> [...]
>> Well, all the stuff I wrote tests for in lkdtm expect the kernel to
>> entirely Oops, and examining the Oops from outside is needed to verify
>> it was the correct type of Oops. I don't think testing via lkdtm can
>> be done from kselftest sensibly.
> Well, at least on arm32, it's definitely oops'ing, but it's not a full
> panic, so the oops could be grabbed from dmesg.
> FWIW, below is a log from and arm32 board running mainline v4.3 that
> runs through all the non-panic/lockup tests one after the other without
> a reboot.

... however, a run on arm64 and it locks up after the OVERFLOW test,
so I think you're right that we need an "outside observer" to reliably
determine pass/fail on these. We'll start looking at that.

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