linux-kernel - Re: [PATCH] futex: avoid kernel taint caused by get_robust

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: <511E6329.5050903@windriver.com>
Date:	Fri, 15 Feb 2013 11:32:41 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Kees Cook <keescook@...omium.org>
CC:	LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>,
	Richard Weinberger <richard@....at>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] futex: avoid kernel taint caused by get_robust_list

On 13-02-15 11:18 AM, Kees Cook wrote:
> On Fri, Feb 15, 2013 at 7:54 AM, Paul Gortmaker
> <paul.gortmaker@...driver.com> wrote:
>> commit ec0c4274e33c0373e476b73e01995c53128f1257 ("futex: Mark
>> get_robust_list as deprecated") added these two WARN_ONCE calls.
>>
>> However, WARN_ONCE taints the kernel, and we shouldn't be allowing
>> any user who wanders by to do this.  For example, the system fuzzer
>> "trinity" uses the tainted state as a metric for when to stop,
>> assuming that it has caused significant wreckage (and indeed
>> that tool is what actually led me to this change).
>>
>> The ability to deprecate this code has been called into question[1],
>> but if that remains to be finalized, then making this change in the
>> interim seems to make sense.
>>
>> [1] http://lkml.indiana.edu/hypermail/linux/kernel/1208.0/01081.html
>>
>> Cc: Dave Jones <davej@...hat.com>
>> Cc: Richard Weinberger <richard@....at>
>> Cc: Kees Cook <keescook@...omium.org>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: stable@...r.kernel.org      # 3.4+
>> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> 
> I Acked the original revert. I thought there was agreement that it was
> needed for checkpointing to work?

There were several acks in the original thread, but for some unknown
reason (at least unknown to me and Richard), it never made it in tree...

P.
--

> 
> -Kees
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/