linux-kernel - Re: [PATCH v13 04/10] arm64: Blacklist non-kprobe-able symbol

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Message-ID: <57564503.8080304@linaro.org>
Date:	Mon, 6 Jun 2016 23:52:35 -0400
From:	David Long <dave.long@...aro.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	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>,
	Li Bin <huawei.libin@...wei.com>,
	Adam Buchbinder <adam.buchbinder@...il.com>,
	Alex Bennée <alex.bennee@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Dave P Martin <Dave.Martin@....com>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Jisheng Zhang <jszhang@...vell.com>,
	John Blackwood <john.blackwood@...r.com>,
	Mark Rutland <mark.rutland@....com>,
	Petr Mladek <pmladek@...e.com>,
	Robin Murphy <robin.murphy@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Vladimir Murzin <Vladimir.Murzin@....com>,
	Yang Shi <yang.shi@...aro.org>,
	Zi Shen Lim <zlim.lnx@...il.com>,
	yalin wang <yalin.wang2010@...il.com>,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v13 04/10] arm64: Blacklist non-kprobe-able symbol

On 06/03/2016 11:40 PM, Masami Hiramatsu wrote:
> Hi David,
>
> On Thu,  2 Jun 2016 23:26:18 -0400
> David Long <dave.long@...aro.org> wrote:
>
>> From: Pratyush Anand <panand@...hat.com>
>>
>> Add all function symbols which are called from do_debug_exception under
>> NOKPROBE_SYMBOL, as they can not kprobed.
>
> I see, but this patch should be applied after kprobes
> are implemented on arm64.
>
> And also, I have a comment below.
>
>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>> index 5954881..4359ca8 100644
>> --- a/arch/arm64/mm/fault.c
>> +++ b/arch/arm64/mm/fault.c
>> @@ -563,6 +563,7 @@ asmlinkage void __exception do_sp_pc_abort(unsigned long addr,
>>   	info.si_addr  = (void __user *)addr;
>>   	arm64_notify_die("Oops - SP/PC alignment exception", regs, &info, esr);
>>   }
>> +NOKPROBE_SYMBOL(do_debug_exception)
>
> This seems at wrong place. Please correct it in this patch.
>
> Thank you,
>


Hmm, yeah not sure how that happened.  It gets fixed in the next patch 
but it shouldn't be like this.

Thanks,
-dl