From: Joonsoo Kim <js1304@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Laura Abbott <labbott@fedoraproject.org>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
kernel-hardening@lists.openwall.com,
Kees Cook <keescook@chromium.org>
Subject: Re: [RFC][PATCH 0/3] Speed up SLUB poisoning + disable checks
Date: Wed, 27 Jan 2016 00:21:35 +0900 [thread overview]
Message-ID: <CAAmzW4P+s+z0p=43SfdrPS=+2iuKqvQKZdAwc=zUENuDS0RvxQ@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1601260900370.27338@east.gentwo.org>
2016-01-27 0:01 GMT+09:00 Christoph Lameter <cl@linux.com>:
> On Tue, 26 Jan 2016, Joonsoo Kim wrote:
>
>> I doesn't follow up that discussion, but, I think that reusing
>> SLAB_POISON for slab sanitization needs more changes. I assume that
>> completeness and performance is matter for slab sanitization.
>>
>> 1) SLAB_POISON isn't applied to specific kmem_cache which has
>> constructor or SLAB_DESTROY_BY_RCU flag. For debug, it's not necessary
>> to be applied, but, for slab sanitization, it is better to apply it to
>> all caches.
>
> Those slabs can be legitimately accessed after the objects were freed. You
> cannot sanitize nor poison.
Oops... you are right. I misunderstand what SLAB_DESTROY_BY_RCU is.
Now, it's clear to me.
Thanks.
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next prev parent reply other threads:[~2016-01-26 15:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-26 1:15 Laura Abbott
2016-01-26 1:15 ` [RFC][PATCH 1/3] slub: Drop lock at the end of free_debug_processing Laura Abbott
2016-01-26 16:19 ` Christoph Lameter
2016-01-26 1:15 ` [RFC][PATCH 2/3] slub: Don't limit debugging to slow paths Laura Abbott
2016-01-26 8:48 ` Paul Bolle
2016-01-26 1:15 ` [PATCH 3/3] slub: Add option to skip consistency checks Laura Abbott
2016-01-26 15:00 ` Christoph Lameter
2016-01-26 7:03 ` [RFC][PATCH 0/3] Speed up SLUB poisoning + disable checks Joonsoo Kim
2016-01-26 15:01 ` Christoph Lameter
2016-01-26 15:21 ` Joonsoo Kim [this message]
2016-02-03 18:46 ` Laura Abbott
2016-02-03 21:06 ` Kees Cook
2016-02-03 21:35 ` Laura Abbott
2016-02-03 23:02 ` Christoph Lameter
2016-02-04 0:46 ` Laura Abbott
2016-02-04 3:23 ` Christoph Lameter
2016-01-26 14:57 ` Christoph Lameter
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