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Date: Wed, 15 Nov 2017 15:23:32 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCHv2 1/2] x86/mm: Do not allow non-MAP_FIXED mapping across
 DEFAULT_MAP_WINDOW border
In-Reply-To: <20171115141326.xzsbkycdwq4vafxf@node.shutemov.name>
Message-ID: <alpine.DEB.2.20.1711151521010.1805@nanos>
References: <20171114134322.40321-1-kirill.shutemov@linux.intel.com> <alpine.DEB.2.20.1711141630210.2044@nanos> <20171114202102.crpgiwgv2lu5aboq@node.shutemov.name> <alpine.DEB.2.20.1711142131010.2221@nanos> <20171114222718.76w4lmclf6wasbl3@node.shutemov.name>
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Sender: owner-linux-mm@kvack.org
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To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Ingo Molnar <mingo@redhat.com>, x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>, Linus Torvalds <torvalds@linux-foundation.org>, Andy Lutomirski <luto@amacapital.net>, Nicholas Piggin <npiggin@gmail.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org

On Wed, 15 Nov 2017, Kirill A. Shutemov wrote:
> On Wed, Nov 15, 2017 at 05:04:26PM +0300, Kirill A. Shutemov wrote:
>  	/* requesting a specific address */
>  	if (addr) {
> -		addr = PAGE_ALIGN(addr);
> +		addr &= PAGE_MASK;
>  		if (!mmap_address_hint_valid(addr, len))
>  			goto get_unmapped_area;
>  
> diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
> index 92db903c3dad..00b296617ca4 100644
> --- a/arch/x86/mm/hugetlbpage.c
> +++ b/arch/x86/mm/hugetlbpage.c
> @@ -166,7 +166,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
>  	}
>  
>  	if (addr) {
> -		addr = ALIGN(addr, huge_page_size(h));
> +		addr &= huge_page_mask(h);
>  		if (!mmap_address_hint_valid(addr, len))
>  			goto get_unmapped_area;

That should work. Care to pickup my variant, make the fixups and resend
along with the selftest which covers both normal and huge mappings?

Thanks,

	tglx

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