From: Kees Cook <keescook@chromium.org>
To: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
LKML <linux-kernel@vger.kernel.org>,
Cong Wang <xiyou.wangcong@gmail.com>,
Jiri Pirko <jiri@resnulli.us>,
"David S. Miller" <davem@davemloft.net>,
Network Development <netdev@vger.kernel.org>
Subject: Re: [PATCH] net: sched: Fix memory exposure from short TCA_U32_SEL
Date: Mon, 27 Aug 2018 07:08:22 -0700 [thread overview]
Message-ID: <CAGXu5jJD++hegH4j0ajZNejg8mgcHjqVyjveWj9BFaXwRCV_dQ@mail.gmail.com> (raw)
In-Reply-To: <d68f13e6-339a-2a40-9c0d-7549cd9aabb3@mojatatu.com>
On Mon, Aug 27, 2018 at 4:46 AM, Jamal Hadi Salim <jhs@mojatatu.com> wrote:
> On 2018-08-26 5:56 p.m., Kees Cook wrote:
>>
>> On Sun, Aug 26, 2018 at 10:30 AM, Jamal Hadi Salim <jhs@mojatatu.com>
>> wrote:
>>>
>>> We should add an nla_policy later.
>>
>>
>> What's the right way to do that for cases like this?
>
>
> Meant something like attached which you alluded-to in your comments
> would give an upper bound (Max allowed keys is 128).
The problem is that policy doesn't parse the contents: "nkeys"
determines the size, so we have to both validate minimum size (to be
sure the location of "nkeys" is valid) and check that the size is at
least nkeys * struct long. I don't think there is a way to do this
with the existing policy language.
-Kees
--
Kees Cook
Pixel Security
next prev parent reply other threads:[~2018-08-27 14:08 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-26 5:58 [PATCH] net: sched: Fix memory exposure from short TCA_U32_SEL Kees Cook
2018-08-26 6:15 ` Al Viro
2018-08-26 6:19 ` Kees Cook
2018-08-26 17:30 ` Jamal Hadi Salim
2018-08-26 21:56 ` Kees Cook
2018-08-27 11:46 ` Jamal Hadi Salim
2018-08-27 14:08 ` Kees Cook [this message]
2018-08-27 14:26 ` Roman Mashak
2018-08-26 17:32 ` Al Viro
2018-08-26 18:57 ` Joe Perches
2018-08-26 21:24 ` Al Viro
2018-08-26 22:26 ` Joe Perches
2018-08-26 22:43 ` Al Viro
2018-08-27 2:00 ` Julia Lawall
2018-08-27 2:35 ` Al Viro
2018-08-27 3:35 ` Julia Lawall
2018-08-27 4:04 ` Al Viro
2018-08-27 4:41 ` Julia Lawall
2018-08-27 1:59 ` Julia Lawall
2018-08-26 22:57 ` Al Viro
2018-08-27 11:57 ` Jamal Hadi Salim
2018-08-27 21:31 ` Cong Wang
2018-08-28 0:03 ` Al Viro
2018-08-28 15:59 ` Al Viro
2018-08-31 4:03 ` Al Viro
2018-08-29 19:07 ` Cong Wang
2018-08-29 21:33 ` Al Viro
2018-08-26 21:22 ` David Miller
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