From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>, Kees Cook <keescook@chromium.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>,
"x86@kernel.org" <x86@kernel.org>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: rwx mapping between ex_table and rodata
Date: Mon, 28 Sep 2015 14:16:06 -0700 [thread overview]
Message-ID: <5609AE16.2070204@zytor.com> (raw)
In-Reply-To: <20150925072259.GA17639@gmail.com>
On 09/25/2015 12:22 AM, Ingo Molnar wrote:
>>
>> To me it looks like another alignment/padding issue like got fixed
>> before. The space between __ex_table and rodata is (seems?) unused, so
>> the default page table permissions end up being W+X. Can we fix the
>> default to be NX instead? It'll make these bugs stay gone.
>
> Yeah. Wanna send a patch for that?
>
At least in the high mapping space, the default should be no permissions
(not present), rather than just NX.
-hpa
next prev parent reply other threads:[~2015-09-28 21:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-24 20:23 rwx mapping between ex_table and rodata Stephen Smalley
2015-09-24 20:26 ` Fwd: " Stephen Smalley
2015-09-24 22:25 ` Kees Cook
2015-09-25 7:22 ` Ingo Molnar
2015-09-26 16:49 ` Kees Cook
2015-09-28 21:16 ` H. Peter Anvin [this message]
2015-09-28 22:05 ` Kees Cook
2015-09-28 22:20 ` H. Peter Anvin
2015-09-25 7:25 ` Ingo Molnar
2015-09-28 14:11 ` Stephen Smalley
2015-09-28 18:27 ` Kees Cook
2015-10-01 7:09 ` Ingo Molnar
2015-10-01 9:03 ` Thomas Gleixner
2015-10-01 9:12 ` Ingo Molnar
2015-10-01 17:45 ` Kees Cook
2015-10-02 7:19 ` Ingo Molnar
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