linux-kernel - Re: [PATCH v4 00/10] Function Granular KASLR

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Message-ID: <aa51eb26-e2a9-c448-a3b8-e9e68deeb468@redhat.com>
Date:   Wed, 22 Jul 2020 10:51:32 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Kees Cook <keescook@...omium.org>, Miroslav Benes <mbenes@...e.cz>
Cc:     Kristen Carlson Accardi <kristen@...ux.intel.com>,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        arjan@...ux.intel.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        rick.p.edgecombe@...el.com, live-patching@...r.kernel.org
Subject: Re: [PATCH v4 00/10] Function Granular KASLR

On 7/22/20 10:39 AM, Kees Cook wrote:
> On Wed, Jul 22, 2020 at 11:27:30AM +0200, Miroslav Benes wrote:
>> Let me CC live-patching ML, because from a quick glance this is something
>> which could impact live patching code. At least it invalidates assumptions
>> which "sympos" is based on.
> 
> In a quick skim, it looks like the symbol resolution is using
> kallsyms_on_each_symbol(), so I think this is safe? What's a good
> selftest for live-patching?
> 

Hi Kees,

I don't think any of the in-tree tests currently exercise the 
kallsyms/sympos end of livepatching.

I do have a local branch that does facilitate creating klp-relocations 
that do rely upon this feature -- I'll try to see if I can get those 
working with this patchset and report back later this week.

-- Joe