linux-kernel - Re: [PATCH v11 5/9] arm64: Kprobes with single stepping support

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Date:	Wed, 20 Apr 2016 09:29:28 +0800
From:	Li Bin <huawei.libin@...wei.com>
To:	David Long <dave.long@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
	William Cohen <wcohen@...hat.com>,
	"Pratyush Anand" <panand@...hat.com>,
	Steve Capper <steve.capper@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Marc Zyngier <marc.zyngier@....com>
CC:	Mark Rutland <mark.rutland@....com>,
	Petr Mladek <pmladek@...e.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	John Blackwood <john.blackwood@...r.com>,
	Feng Kan <fkan@....com>, Zi Shen Lim <zlim.lnx@...il.com>,
	Dave P Martin <Dave.Martin@....com>,
	Yang Shi <yang.shi@...aro.org>,
	Vladimir Murzin <Vladimir.Murzin@....com>,
	Kees Cook <keescook@...omium.org>,
	"Suzuki K. Poulose" <suzuki.poulose@....com>,
	"Mark Brown" <broonie@...nel.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Mark Salyzyn <salyzyn@...roid.com>,
	James Morse <james.morse@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robin Murphy <Robin.Murphy@....com>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Balamurugan Shanmugam <bshanmugam@....com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Ding Tianhong <dingtianhong@...wei.com>, <wangnan0@...wei.com>
Subject: Re: [PATCH v11 5/9] arm64: Kprobes with single stepping support

Hi David,

on 2016/3/9 13:32, David Long wrote:
> +int __kprobes arch_prepare_kprobe(struct kprobe *p)
> +{
> +	unsigned long probe_addr = (unsigned long)p->addr;

Here should verify the addr alignment:

	if (probe_addr & 0x3)
		return -EINVAL;

Thanks,
Li Bin

> +
> +	/* copy instruction */
> +	p->opcode = le32_to_cpu(*p->addr);
> +
> +	if (in_exception_text(probe_addr))
> +		return -EINVAL;
> +
> +	/* decode instruction */
> +	switch (arm_kprobe_decode_insn(p->addr, &p->ainsn)) {
> +	case INSN_REJECTED:	/* insn not supported */
> +		return -EINVAL;
> +
> +	case INSN_GOOD_NO_SLOT:	/* insn need simulation */
> +		return -EINVAL;
> +
> +	case INSN_GOOD:	/* instruction uses slot */
> +		p->ainsn.insn = get_insn_slot();
> +		if (!p->ainsn.insn)
> +			return -ENOMEM;
> +		break;
> +	};
> +
> +	/* prepare the instruction */
> +	arch_prepare_ss_slot(p);
> +
> +	return 0;
> +}
> +