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Re: [RFC v2 PATCH] futex: extend set_robust_list to allow 2 locking ABIs at the same time.
- From: Florian Weimer <fweimer at redhat dot com>
- To: Thomas Gleixner <tglx at linutronix dot de>
- Cc: Carlos O'Donell <carlos at redhat dot com>, Shawn Landden <shawn at git dot icu>, libc-alpha at sourceware dot org, linux-api at vger dot kernel dot org, LKML <linux-kernel at vger dot kernel dot org>, Arnd Bergmann <arnd at arndb dot de>, Deepa Dinamani <deepa dot kernel at gmail dot com>, Oleg Nesterov <oleg at redhat dot com>, Andrew Morton <akpm at linux-foundation dot org>, Catalin Marinas <catalin dot marinas at arm dot com>, Keith Packard <keithp at keithp dot com>, Peter Zijlstra <peterz at infradead dot org>
- Date: Tue, 05 Nov 2019 15:33:38 +0100
- Subject: Re: [RFC v2 PATCH] futex: extend set_robust_list to allow 2 locking ABIs at the same time.
- References: <20191104002909.25783-1-shawn@git.icu> <87woceslfs.fsf@oldenburg2.str.redhat.com> <alpine.DEB.2.21.1911051053470.17054@nanos.tec.linutronix.de> <87sgn2skm6.fsf@oldenburg2.str.redhat.com> <alpine.DEB.2.21.1911051253430.17054@nanos.tec.linutronix.de> <f11d82f1-1e81-e344-3ad2-76e4cb488a3d@redhat.com> <alpine.DEB.2.21.1911051520090.17054@nanos.tec.linutronix.de>
* Thomas Gleixner:
> On Tue, 5 Nov 2019, Carlos O'Donell wrote:
>> On 11/5/19 6:56 AM, Thomas Gleixner wrote:
>> The other issue is this:
>>
>> "Robust mutexes do not take ROBUST_LIST_LIMIT into account"
>> https://sourceware.org/bugzilla/show_bug.cgi?id=19089
>
> "The kernel limits the length of the robust mutex list to 2048 entries.
> This constant does not seem to be exported to user space."
>
> FWIW, the constant is defined in the UAPI futex header.
>
> The main concern here is not the actual number of futexes held by a task.
>
> The real issue is that the robust list could be circular by incident or
> malice and there is no way for the kernel to figure that out. That would
> prevent the task from exiting and make it iterate over the list until
> doomsday, i.e. a nice unpriviledged DoS.
>
> So I fear the kernel cannot really help with this one.
I'm actually fine with treating ROBUST_LIST_LIMIT as an ABI constant.
It's just not clear to me if the constant has this status today. I
suspect it was just split from the implementation headers at one point.
Thanks,
Florian