From: Willy Tarreau <w@1wt.eu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Sarah Sharp <sarah.a.sharp@linux.intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Marcus Meissner <meissner@suse.de>,
linux-kernel@vger.kernel.org, tj@kernel.org,
akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk
Subject: Re: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking
Date: Mon, 29 Nov 2010 22:49:33 +0100 [thread overview]
Message-ID: <20101129214933.GD8442@1wt.eu> (raw)
In-Reply-To: <4CF3F996.4090703@zytor.com>
On Mon, Nov 29, 2010 at 11:05:58AM -0800, H. Peter Anvin wrote:
> Can we please not use CAP_SYS_ADMIN for this? Relying on CAP_SYS_ADMIN
> is worse than anything else -- it is a fixed policy hardcoded in the
> kernel, with no ability for the system owner to delegate the policy
> outward, e.g. by adding group read permission and/or chgrp the file.
>
> Delegating CAP_SYS_ADMIN, of course, otherwise known as "everything", is
> worse than anything...
Agreed, that's why I still think that hiding lots of valuable information to
non-root users will get more users added to unmanaged sudoers files, which
will result in much more holes in the systems than we currently have.
Willy
next prev parent reply other threads:[~2010-11-29 21:50 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-16 10:46 [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking Marcus Meissner
2010-11-17 5:07 ` Kyle McMartin
2010-11-18 7:48 ` Ingo Molnar
2010-11-20 3:18 ` Kees Cook
2010-11-26 7:51 ` Ingo Molnar
2010-11-17 5:40 ` Kyle Moffett
2010-11-17 5:41 ` Kyle Moffett
2010-11-17 5:58 ` Linus Torvalds
2010-11-17 6:19 ` Willy Tarreau
2010-11-18 7:31 ` Ingo Molnar
2010-11-23 17:24 ` Pavel Machek
2010-11-26 7:38 ` Ingo Molnar
2010-11-29 19:03 ` H. Peter Anvin
2010-11-20 11:32 ` Avi Kivity
2010-11-19 19:19 ` Sarah Sharp
2010-11-19 19:54 ` Linus Torvalds
2010-11-19 19:58 ` david
2010-11-19 20:04 ` Linus Torvalds
2010-11-19 20:16 ` Willy Tarreau
2010-11-19 20:55 ` david
2010-11-26 7:48 ` Ingo Molnar
2010-11-29 16:33 ` Sarah Sharp
2010-11-29 18:04 ` Ingo Molnar
2010-11-29 19:05 ` H. Peter Anvin
2010-11-29 19:21 ` Eric Paris
2010-11-29 19:38 ` H. Peter Anvin
2010-11-29 21:49 ` Willy Tarreau [this message]
2010-11-29 23:31 ` Alan Cox
2010-11-30 11:58 ` Ingo Molnar
2010-11-20 11:05 ` Richard W.M. Jones
-- strict thread matches above, loose matches on Subject: below --
2010-11-19 21:12 Andy Walls
2010-11-19 23:22 ` Linus Torvalds
2010-11-20 2:40 ` Kees Cook
2010-11-20 19:47 ` Henrique de Moraes Holschuh
2010-11-29 22:58 ` Kevin Easton
2010-11-04 10:09 Marcus Meissner
2010-11-04 10:11 ` Tejun Heo
2010-11-04 11:46 ` Ingo Molnar
2010-11-04 12:29 ` Marcus Meissner
2010-11-04 13:58 ` Ingo Molnar
2010-11-04 14:11 ` Ingo Molnar
2010-11-04 14:33 ` Marcus Meissner
2010-11-04 14:38 ` Tejun Heo
2010-11-04 14:43 ` H. Peter Anvin
2010-11-04 14:48 ` Tejun Heo
2010-11-04 19:08 ` Ingo Molnar
2010-11-07 18:02 ` Andi Kleen
2010-11-07 18:32 ` H. Peter Anvin
2010-11-10 8:53 ` Ingo Molnar
2010-11-11 2:51 ` H. Peter Anvin
2010-11-11 7:05 ` Ingo Molnar
2010-11-05 2:38 ` Frank Rowand
2010-11-10 20:58 ` Jesper Juhl
2010-11-05 0:20 ` Jesper Juhl
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