From: Kees Cook <keescook@chromium.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: "kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
James Morris <james.l.morris@oracle.com>,
Laura Abbott <labbott@redhat.com>,
"x86@kernel.org" <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-security-module <linux-security-module@vger.kernel.org>
Subject: Re: [PATCH v2 05/20] randstruct: Whitelist struct security_hook_heads cast
Date: Sat, 27 May 2017 13:09:59 -0700 [thread overview]
Message-ID: <CAGXu5j+SA8N6s7StQX1OQsNf6YeQBkS7vSFVN7MR=BzJMwJH9Q@mail.gmail.com> (raw)
In-Reply-To: <20170527084135.GA26844@infradead.org>
On Sat, May 27, 2017 at 1:41 AM, Christoph Hellwig <hch@infradead.org> wrote:
> On Fri, May 26, 2017 at 01:17:09PM -0700, Kees Cook wrote:
>> The LSM initialization routines walk security_hook_heads as an array
>> of struct list_head instead of via names to avoid a ton of needless
>> source. Whitelist this to avoid the false positive warning from the
>> plugin:
>
> I think this crap just needs to be fixed properly. If not it almost
> defeats the protections as the "security" ops are just about everywhere.
There's nothing unsafe about 3dfc9b02864b19f4dab376f14479ee4ad1de6c9e,
it just avoids tons of needless code. Tetsuo has some other ideas for
cleaning it up further, but I don't like it because it removes
compile-time verification of function types. There have been a lot of
trade-offs in getting this working correctly, so I don't have any
problem with how it looks currently. It's just a collision of
assumptions between randstruct (omg, you're accessing a randomized
struct with a different struct!) and the security head list (all
entries are lists, and we're just initializing them).
-Kees
--
Kees Cook
Pixel Security
next prev parent reply other threads:[~2017-05-27 20:10 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-26 20:17 [PATCH v2 00/20] Introduce struct layout randomization plugin Kees Cook
2017-05-26 20:17 ` [PATCH v2 01/20] NFS: Avoid cross-structure casting Kees Cook
2017-05-28 7:53 ` Christoph Hellwig
2017-05-28 16:55 ` Kees Cook
2017-05-26 20:17 ` [PATCH v2 02/20] gcc-plugins: Detail c-common.h location for GCC 4.6 Kees Cook
2017-05-26 20:17 ` [PATCH v2 03/20] compiler: Add __designated_init annotation Kees Cook
2017-05-26 20:17 ` [PATCH v2 04/20] gcc-plugins: Add the randstruct plugin Kees Cook
2017-06-29 22:08 ` Arnd Bergmann
2017-06-29 22:53 ` Kees Cook
2017-06-30 0:04 ` Kees Cook
2017-06-30 7:35 ` Arnd Bergmann
2017-06-30 7:55 ` Ard Biesheuvel
2017-06-30 8:27 ` Arnd Bergmann
2017-06-30 14:41 ` Kees Cook
2017-06-30 15:22 ` Arnd Bergmann
2017-05-26 20:17 ` [PATCH v2 05/20] randstruct: Whitelist struct security_hook_heads cast Kees Cook
2017-05-27 8:41 ` Christoph Hellwig
2017-05-27 20:09 ` Kees Cook [this message]
2017-05-27 22:04 ` Tetsuo Handa
2017-05-28 0:43 ` [kernel-hardening] " Kees Cook
2017-05-30 10:34 ` James Morris
2017-05-26 20:17 ` [PATCH v2 06/20] randstruct: Whitelist UNIXCB cast Kees Cook
2017-05-26 20:20 ` Kees Cook
2017-05-28 7:56 ` Christoph Hellwig
2017-05-26 20:17 ` [PATCH v2 07/20] randstruct: Whitelist big_key path struct overloading Kees Cook
2017-05-28 8:12 ` Christoph Hellwig
2017-05-28 16:59 ` Kees Cook
2017-06-19 19:24 ` Kees Cook
2017-09-07 7:20 ` Christoph Hellwig
2017-09-07 22:55 ` Kees Cook
2017-05-26 20:17 ` [PATCH v2 08/20] randstruct: Whitelist NIU struct page overloading Kees Cook
2017-05-28 8:15 ` Christoph Hellwig
2017-05-28 17:35 ` Kees Cook
2017-05-28 17:37 ` Kees Cook
2017-05-26 20:17 ` [PATCH v2 09/20] randstruct: Mark various structs for randomization Kees Cook
2017-05-26 20:17 ` [PATCH v2 10/20] randstruct: opt-out externally exposed function pointer structs Kees Cook
2017-05-26 20:17 ` [PATCH v2 11/20] randstruct: Disable randomization of ACPICA structs Kees Cook
2017-05-27 8:42 ` Christoph Hellwig
2017-05-27 20:03 ` Kees Cook
2017-05-28 4:55 ` Christoph Hellwig
2017-05-26 20:17 ` [PATCH v2 12/20] sgi-xp: Use designated initializers Kees Cook
2017-05-27 8:44 ` Christoph Hellwig
2017-05-26 20:17 ` [PATCH v2 13/20] drm/amdgpu: " Kees Cook
2017-05-26 20:17 ` [PATCH v2 14/20] drm/amd/powerplay: " Kees Cook
2017-05-27 8:47 ` Christoph Hellwig
2017-05-27 20:10 ` Kees Cook
2017-05-26 20:17 ` [PATCH v2 15/20] mtk-vcodec: " Kees Cook
2017-05-26 20:17 ` [PATCH v2 16/20] ntfs: Use ERR_CAST() to avoid cross-structure cast Kees Cook
2017-05-26 20:17 ` [PATCH v2 17/20] ocfs2: " Kees Cook
2017-05-26 20:17 ` [PATCH v2 18/20] randstruct: Enable function pointer struct detection Kees Cook
2017-05-26 20:17 ` [PATCH v2 19/20] [RFC] task_struct: Allow randomized layout Kees Cook
2017-05-26 20:23 ` Linus Torvalds
2017-05-26 20:32 ` Kees Cook
2017-05-26 20:17 ` [PATCH v2 20/20] ACPICA: Use designated initializers Kees Cook
2017-05-28 7:45 ` Christoph Hellwig
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