linux-kernel - Re: [PATCH v15 04/10] arm64: Kprobes with single stepping support

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Message-ID: <5790E14D.8030904@linaro.org>
Date:	Thu, 21 Jul 2016 10:50:53 -0400
From:	David Long <dave.long@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Huang Shijie <shijie.huang@....com>,
	James Morse <james.morse@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Pratyush Anand <panand@...hat.com>,
	Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
	Will Deacon <will.deacon@....com>,
	William Cohen <wcohen@...hat.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Steve Capper <steve.capper@...aro.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Li Bin <huawei.libin@...wei.com>,
	Jisheng Zhang <jszhang@...vell.com>,
	Mark Rutland <mark.rutland@....com>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Vladimir Murzin <Vladimir.Murzin@....com>,
	Petr Mladek <pmladek@...e.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Robin Murphy <robin.murphy@....com>,
	Mark Brown <broonie@...nel.org>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Dave P Martin <Dave.Martin@....com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	yalin wang <yalin.wang2010@...il.com>,
	Yang Shi <yang.shi@...aro.org>,
	Zi Shen Lim <zlim.lnx@...il.com>,
	John Blackwood <john.blackwood@...r.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Adam Buchbinder <adam.buchbinder@...il.com>,
	Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH v15 04/10] arm64: Kprobes with single stepping support

On 07/20/2016 11:49 AM, Catalin Marinas wrote:
> On Fri, Jul 08, 2016 at 12:35:48PM -0400, David Long wrote:
>> +#define MIN_STACK_SIZE(addr)	(on_irq_stack(addr, raw_smp_processor_id()) ? \
>> +	min((unsigned long)IRQ_STACK_SIZE,	\
>> +	IRQ_STACK_PTR(raw_smp_processor_id()) - (addr)) : \
>> +	min((unsigned long)MAX_STACK_SIZE,	\
>> +	(unsigned long)current_thread_info() + THREAD_START_SP - (addr)))
>
> I presume you've never tested the on_irq_stack() path in this macro.
>

The combined patches were run through the test suite we've been using 
all along.  Apparently that either does not test jprobes on functions 
using the interrupt stack or somehow just didn't happen to cause an 
overwrite of something critical.

-dl