From: Vasiliy Kulikov <segoon@openwall.com>
To: James Bottomley <James.Bottomley@suse.de>
Cc: Greg KH <greg@kroah.com>,
security@kernel.org, acpi4asus-user@lists.sourceforge.net,
linux-scsi@vger.kernel.org, rtc-linux@googlegroups.com,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
platform-driver-x86@vger.kernel.org, open-iscsi@googlegroups.com,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org
Subject: Re: [Security] [PATCH 00/20] world-writable files in sysfs and debugfs
Date: Tue, 15 Mar 2011 19:08:06 +0300 [thread overview]
Message-ID: <20110315160804.GA3380@albatros> (raw)
In-Reply-To: <1300189828.4017.2.camel@mulgrave.site>
On Tue, Mar 15, 2011 at 07:50 -0400, James Bottomley wrote:
> 1. Did anyone actually check for capabilities before assuming world
> writeable files were wrong?
I didn't check all these files as I haven't got these hardware :-) But
as I can "chmod a+w" all sysfs files on my machine and they all become
sensible to nonroot writes, I suppose there is nothing preventing
nonroot users from writing to these buggy sysfs files. As you can see,
there are no capable() checks in these drivers in open() or write().
> 2. Even if there aren't any capabilities checks in the implementing
> routines, should there be (are we going the separated
> capabilities route vs the monolithic root route)?
IMO, In any case old good DAC security model must not be obsoleted just
because someone thinks that MAC or anything else is more convenient for
him. If sysfs is implemented via filesystem then it must support POSIX
permissions semantic. MAC is very good in _some_ cases, but not instead
of DAC.
Thanks,
--
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
WARNING: multiple messages have this Message-ID (diff)
From: segoon@openwall.com (Vasiliy Kulikov)
To: linux-arm-kernel@lists.infradead.org
Subject: [Security] [PATCH 00/20] world-writable files in sysfs and debugfs
Date: Tue, 15 Mar 2011 19:08:06 +0300 [thread overview]
Message-ID: <20110315160804.GA3380@albatros> (raw)
In-Reply-To: <1300189828.4017.2.camel@mulgrave.site>
On Tue, Mar 15, 2011 at 07:50 -0400, James Bottomley wrote:
> 1. Did anyone actually check for capabilities before assuming world
> writeable files were wrong?
I didn't check all these files as I haven't got these hardware :-) But
as I can "chmod a+w" all sysfs files on my machine and they all become
sensible to nonroot writes, I suppose there is nothing preventing
nonroot users from writing to these buggy sysfs files. As you can see,
there are no capable() checks in these drivers in open() or write().
> 2. Even if there aren't any capabilities checks in the implementing
> routines, should there be (are we going the separated
> capabilities route vs the monolithic root route)?
IMO, In any case old good DAC security model must not be obsoleted just
because someone thinks that MAC or anything else is more convenient for
him. If sysfs is implemented via filesystem then it must support POSIX
permissions semantic. MAC is very good in _some_ cases, but not instead
of DAC.
Thanks,
--
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
next prev parent reply other threads:[~2011-03-15 16:12 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-04 12:22 [PATCH 00/20] world-writable files in sysfs and debugfs Vasiliy Kulikov
2011-02-04 12:22 ` Vasiliy Kulikov
2011-02-04 12:22 ` Vasiliy Kulikov
2011-02-04 12:22 ` Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 01/20] mach-omap2: mux: world-writable debugfs files Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-04 20:09 ` Tony Lindgren
2011-02-04 20:09 ` Tony Lindgren
2011-02-04 12:23 ` [PATCH 02/20] mach-omap2: pm: world-writable debugfs timer files Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-04 20:10 ` Tony Lindgren
2011-02-04 20:10 ` Tony Lindgren
2011-02-04 22:53 ` Kevin Hilman
2011-02-04 22:53 ` Kevin Hilman
2011-02-04 12:23 ` [PATCH 03/20] mach-omap2: smartreflex: world-writable debugfs voltage files Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-04 20:10 ` Tony Lindgren
2011-02-04 20:10 ` Tony Lindgren
2011-02-04 22:54 ` Kevin Hilman
2011-02-04 22:54 ` Kevin Hilman
2011-02-07 5:33 ` Menon, Nishanth
2011-02-07 5:33 ` Menon, Nishanth
2011-02-04 12:23 ` [PATCH 04/20] mach-ux500: mbox-db5500: world-writable sysfs fifo file Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 05/20] leds: lp5521: world-writable sysfs engine* files Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 06/20] leds: lp5523: world-writable engine* sysfs files Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 07/20] video: sn9c102: world-wirtable " Vasiliy Kulikov
2011-02-04 15:29 ` Mauro Carvalho Chehab
2011-02-04 20:28 ` Luca Risolia
2011-02-04 12:23 ` [PATCH 08/20] mfd: ab3100: world-writable debugfs *_priv files Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-18 17:01 ` Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 09/20] mfd: ab3500: world-writable debugfs register-* files Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 10/20] mfd: ab8500: " Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 11/20] misc: ep93xx_pwm: world-writable sysfs files Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 12/20] net: can: at91_can: " Vasiliy Kulikov
2011-02-04 12:42 ` Kurt Van Dijck
2011-02-04 12:42 ` Kurt Van Dijck
2011-02-04 21:06 ` David Miller
2011-02-04 21:06 ` David Miller
2011-02-07 11:38 ` About bittiming calculation result Tomoya MORINAGA
2011-02-07 12:00 ` Wolfgang Grandegger
2011-02-07 12:00 ` Wolfgang Grandegger
2011-02-07 15:52 ` Wolfgang Grandegger
2011-02-07 15:52 ` Wolfgang Grandegger
2011-02-08 1:27 ` Tomoya MORINAGA
2011-02-08 1:27 ` Tomoya MORINAGA
2011-02-08 7:57 ` Wolfgang Grandegger
2011-02-08 7:57 ` Wolfgang Grandegger
2011-02-08 1:09 ` Tomoya MORINAGA
2011-02-08 1:09 ` Tomoya MORINAGA
2011-02-08 3:29 ` Bhupesh SHARMA
2011-02-08 3:29 ` Bhupesh SHARMA
2011-02-08 4:11 ` Tomoya MORINAGA
2011-02-08 4:11 ` Tomoya MORINAGA
2011-02-04 12:23 ` [PATCH 13/20] net: can: janz-ican3: world-writable sysfs termination file Vasiliy Kulikov
2011-02-04 21:06 ` David Miller
2011-02-04 21:06 ` David Miller
2011-02-04 12:23 ` [PATCH 14/20] platform: x86: acer-wmi: world-writable sysfs threeg file Vasiliy Kulikov
2011-02-04 12:23 ` [PATCH 15/20] platform: x86: asus_acpi: world-writable procfs files Vasiliy Kulikov
2011-02-04 12:23 ` Vasiliy Kulikov
2011-02-04 12:53 ` Corentin Chary
2011-02-04 12:24 ` [PATCH 16/20] platform: x86: tc1100-wmi: world-writable sysfs wireless and jogdial files Vasiliy Kulikov
2011-02-04 12:24 ` [PATCH 17/20] rtc: rtc-ds1511: world-writable sysfs nvram file Vasiliy Kulikov
2011-02-04 12:24 ` [PATCH 18/20] scsi: aic94xx: world-writable sysfs update_bios file Vasiliy Kulikov
2011-02-04 12:24 ` [PATCH 19/20] scsi: iscsi: world-writable sysfs priv_sess file Vasiliy Kulikov
2011-03-13 8:28 ` Mike Christie
2011-03-13 8:28 ` Mike Christie
2011-02-04 12:24 ` [PATCH 20/20] fs: ubifs: world-writable debugfs dump_* files Vasiliy Kulikov
2011-02-04 12:24 ` Vasiliy Kulikov
2011-02-06 15:16 ` Artem Bityutskiy
2011-02-06 15:16 ` Artem Bityutskiy
2011-02-04 13:11 ` [rtc-linux] [PATCH 00/20] world-writable files in sysfs and debugfs Linus Walleij
2011-02-04 13:11 ` Linus Walleij
2011-02-04 13:11 ` Linus Walleij
2011-02-04 13:11 ` Linus Walleij
2011-02-21 11:42 ` Samuel Ortiz
2011-03-12 20:23 ` Vasiliy Kulikov
2011-03-12 20:23 ` Vasiliy Kulikov
2011-03-12 20:23 ` Vasiliy Kulikov
2011-03-14 22:18 ` [Security] " Andrew Morton
2011-03-14 22:18 ` Andrew Morton
2011-03-15 2:26 ` James Bottomley
2011-03-15 2:26 ` James Bottomley
2011-03-15 3:09 ` [Security] " Greg KH
2011-03-15 3:09 ` Greg KH
2011-03-15 11:50 ` James Bottomley
2011-03-15 11:50 ` James Bottomley
2011-03-15 14:18 ` Greg KH
2011-03-15 14:18 ` Greg KH
2011-03-15 14:25 ` James Bottomley
2011-03-15 14:25 ` James Bottomley
2011-03-15 16:08 ` Vasiliy Kulikov [this message]
2011-03-15 16:08 ` Vasiliy Kulikov
2011-03-15 16:32 ` James Bottomley
2011-03-15 16:32 ` James Bottomley
2011-03-15 16:32 ` James Bottomley
2011-03-12 20:23 ` Vasiliy Kulikov
2011-03-12 20:23 ` Vasiliy Kulikov
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