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From: Kristen Carlson Accardi <kristen@linux.intel.com>
To: Joe Lawrence <joe.lawrence@redhat.com>,
	Kees Cook <keescook@chromium.org>,
	Miroslav Benes <mbenes@suse.cz>
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	arjan@linux.intel.com, x86@kernel.org,
	linux-kernel@vger.kernel.org,
	kernel-hardening@lists.openwall.com, rick.p.edgecombe@intel.com,
	live-patching@vger.kernel.org
Subject: Re: [PATCH v4 00/10] Function Granular KASLR
Date: Wed, 22 Jul 2020 11:24:46 -0700
Message-ID: <24fedc0f503527ef847a4f534277856388fb6a6a.camel@linux.intel.com> (raw)
In-Reply-To: <b5bc7a92-a11e-d75d-eefb-fc640c87490d@redhat.com>

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.


  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200717170008.5949-1-kristen@linux.intel.com>
2020-07-22  9:27 ` Miroslav Benes
2020-07-22 14:39   ` Kees Cook
2020-07-22 14:51     ` Joe Lawrence
2020-07-22 14:56       ` Joe Lawrence
2020-07-22 18:24         ` Kristen Carlson Accardi [this message]
2020-07-22 16:07     ` Josh Poimboeuf
2020-07-22 19:42       ` Kees Cook
2020-07-22 19:56         ` Kristen Carlson Accardi
2020-07-22 21:33           ` Josh Poimboeuf
2020-08-03 11:39   ` Evgenii Shatokhin
2020-08-03 17:45     ` Kees Cook
2020-08-03 18:17       ` Joe Lawrence
2020-08-03 19:38         ` Frank Ch. Eigler
2020-08-03 20:11           ` Kees Cook
2020-08-03 21:12             ` Frank Ch. Eigler
2020-08-03 21:41               ` Kees Cook
2020-08-04  0:48                 ` Frank Ch. Eigler
2020-08-04 17:04         ` Jessica Yu
2020-08-04 18:23 ` Joe Lawrence
2020-08-07 16:38   ` Kristen Carlson Accardi
2020-08-07 17:20     ` Kees Cook
2020-08-10 16:10       ` Kristen Carlson Accardi
2020-08-12 17:18   ` Kristen Carlson Accardi

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