Messages in this thread |  | | Date | Sat, 16 Apr 2022 14:13:25 -0700 | From | Kees Cook <> | Subject | Re: [PATCH 2/2] selftests/lkdtm: add config |
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On Mon, Apr 04, 2022 at 12:50:01PM +0500, Muhammad Usama Anjum wrote: > Hi Kees, > > Any thoughts? > > On 3/15/22 4:55 PM, Muhammad Usama Anjum wrote: > > On 3/10/22 10:22 PM, Muhammad Usama Anjum wrote: > >> On 3/10/22 12:23 AM, Kees Cook wrote: > >>> On Fri, Feb 18, 2022 at 01:56:20AM +0500, Muhammad Usama Anjum wrote: > >>>> Add config option which is needed for SLAB_LINEAR_OVERFLOW test. It > >>>> needs KASAN enabled. > >>> > >>> I'd prefer this use the SLAB_DEBUG options -- KASAN is very heavy. > >> I'll test it out and update in the next patch version. > >> I've tested by removing KASAN and adding the following config: > > CONFIG_SLAB=y > > CONFIG_DEBUG_SLAB=y
I recommend slub instead:
CONFIG_SLUB=y CONFIG_SLUB_DEBUG=y
and one more, see below...
> > > > The result of SLAB_LINEAR_OVERFLOW test doesn't remain deterministic in > > this config. The task never crashes and hence stack trace never appears. > > When executed several times we get "Slab corruption" logs and after some > > more tries whole kernel crashes. I've not used DEBUG_SLAB before and not > > sure if this is the expected behavior. If we aren't sure, we can keep > > KASAN turned on instead.
I think you need to enable the actual kmem debugging with a boot param ("slub_debug=ZF"), or with CONFIG_SLUB_DEBUG_ON=y.
-- Kees Cook
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