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Message-ID: <24fedc0f503527ef847a4f534277856388fb6a6a.camel@linux.intel.com>
Date: Wed, 22 Jul 2020 11:24:46 -0700
From: Kristen Carlson Accardi <kristen@...ux.intel.com>
To: Joe Lawrence <joe.lawrence@...hat.com>, Kees Cook
<keescook@...omium.org>, Miroslav Benes <mbenes@...e.cz>
Cc: 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 Wed, 2020-07-22 at 10:56 -0400, Joe Lawrence wrote:
> On 7/22/20 10:51 AM, Joe Lawrence wrote:
> > 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.
> >
>
> On second thought, I mispoke.. The general livepatch code does use
> it:
>
> klp_init_object
> klp_init_object_loaded
> klp_find_object_symbol
>
> in which case any of the current kselftests should exercise that.
>
> % make -C tools/testing/selftests/livepatch run_tests
>
> -- Joe
>
Thanks, it looks like this should work for helping me exercise the live
patch code paths. I will take a look and get back to you all.
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