From: Dave Hansen <dave.hansen@intel.com>
To: Alexander Potapenko <glider@google.com>,
akpm@linux-foundation.org, cl@linux.com, dvyukov@google.com,
keescook@chromium.org, labbott@redhat.com
Cc: linux-mm@kvack.org, linux-security-module@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: Re: [PATCH 1/3] mm: security: introduce the init_allocations=1 boot option
Date: Thu, 18 Apr 2019 09:35:32 -0700 [thread overview]
Message-ID: <981d439a-1107-2730-f27e-17635ee4a125@intel.com> (raw)
In-Reply-To: <20190418154208.131118-2-glider@google.com>
On 4/18/19 8:42 AM, Alexander Potapenko wrote:
> This option adds the possibility to initialize newly allocated pages and
> heap objects with zeroes. This is needed to prevent possible information
> leaks and make the control-flow bugs that depend on uninitialized values
> more deterministic.
Isn't it better to do this at free time rather than allocation time? If
doing it at free, you can't even have information leaks for pages that
are in the allocator.
next prev parent reply other threads:[~2019-04-18 16:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-18 15:42 [PATCH 0/3] RFC: add " Alexander Potapenko
2019-04-18 15:42 ` [PATCH 1/3] mm: security: introduce the " Alexander Potapenko
2019-04-18 16:35 ` Dave Hansen [this message]
2019-04-18 16:43 ` Alexander Potapenko
2019-04-18 16:50 ` Alexander Potapenko
2019-04-23 8:31 ` Michal Hocko
2019-04-18 22:08 ` Randy Dunlap
2019-04-23 19:00 ` Kees Cook
2019-04-26 12:12 ` Alexander Potapenko
2019-04-23 20:36 ` Dave Hansen
2019-04-26 14:14 ` Christopher Lameter
[not found] ` <alpine.DEB.2.21.1904260911570.8340@nuc-kabylake>
2019-04-26 15:24 ` Christopher Lameter
2019-04-26 15:48 ` Alexander Potapenko
2019-04-18 15:42 ` [PATCH 2/3] gfp: mm: introduce __GFP_NOINIT Alexander Potapenko
2019-04-18 16:52 ` Dave Hansen
2019-04-23 19:14 ` Kees Cook
2019-04-23 20:40 ` Dave Hansen
2019-04-23 19:11 ` Kees Cook
2019-04-18 15:42 ` [PATCH 3/3] RFC: net: apply __GFP_NOINIT to AF_UNIX sk_buff allocations Alexander Potapenko
2019-04-23 19:17 ` Kees Cook
2019-04-18 15:44 ` [PATCH 0/3] RFC: add init_allocations=1 boot option Alexander Potapenko
2019-04-18 22:07 ` Randy Dunlap
2019-04-23 18:49 ` Kees Cook
2019-04-26 12:39 ` Alexander Potapenko
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