linux-kernel - Re: [PATCH] KERNEL: resource: Fix bug on leakage in /proc/iomem file

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAGXu5j+TAncQVkW6ArfL6CfT_LCHVE-HUtW+0kq3+FK+1rK_Qg@mail.gmail.com>
Date:	Wed, 6 Apr 2016 14:27:38 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Emrah Demir <ed@...sec.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH] KERNEL: resource: Fix bug on leakage in /proc/iomem file

On Wed, Apr 6, 2016 at 2:19 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Wed, Apr 6, 2016 at 10:54 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> So I'd find a patch like the attached to be perfectly acceptable (in
>> fact, we should have done this long ago).
>
> I just committed it, let's see if some odd program uses the iomem
> data. I doubt it, and I always enjoy improvements that remove more
> lines of code than they add.

Hrm, okay. I still think just changing the perms would be less
troublesome. Knowing where the kernel is in physical memory when
debugging physical memory issues seems important to me. But, I have
never actually used it since I prefer looking in kallsyms. :)

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security