linux-kernel - Re: [PATCHv2 2/2] arm64: Allow changing of attributes outside of modules

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Date:	Fri, 13 Nov 2015 16:32:13 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Laura Abbott <labbott@...oraproject.org>
CC:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"Zhong Jiang" <zhongjiang@...wei.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org>,
	"Mark Rutland" <mark.rutland@....com>
Subject: Re: [PATCHv2 2/2] arm64: Allow changing of attributes outside of
 modules


>> +static int update_pmd_range(struct mm_struct *mm, pud_t *pud,
>> +				unsigned long addr, unsigned long end,
>> +				pgprot_t clear, pgprot_t set)
>> +{
>> +	pmd_t *pmd;
>> +	unsigned long next;
>> +	int err = 0;
>> +
>> +	if (pud_sect(*pud)) {
>> +		if (!IS_ENABLED(CONFIG_DEBUG_CHANGE_PAGEATTR)) {
>> +			err = -EINVAL;
>> +			goto out;
>> +		}
>> +		pmd = pmd_alloc_one(&init_mm, addr);
>> +		if (!pmd) {
>> +			err = -ENOMEM;
>> +			goto out;
>> +		}
>> +		split_pud(pud, pmd);
>> +		pud_populate(&init_mm, pud, pmd);
>> +	}
>> +
>>  
>> -	pte = clear_pte_bit(pte, cdata->clear_mask);
>> -	pte = set_pte_bit(pte, cdata->set_mask);
>> +	pmd = pmd_offset(pud, addr);
>> +	if (pmd_none(*pmd)) {
>> +		err = -EFAULT;
>> +		goto out;
>> +	}
>> +
>> +	do {
>> +		next = pmd_addr_end(addr, end);
>> +		if (((addr | end) & ~SECTION_MASK) == 0) {
> 
> Hi Laura,
> 
> Why not like this?
> 		if (pmd_sect(*pmd) && ((addr | nest) & ~SECTION_MASK) == 0) {

Sorry, typo error, nest -> next


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