linux-kernel - Re: [PATCH RFC v2 0/2] Fix procfs PCI resources mmap

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Message-ID: <20141104141520.GA8802@e102568-lin.cambridge.arm.com>
Date:	Tue, 4 Nov 2014 14:15:20 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Russell King <linux@....linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Michal Simek <monstr@...str.eu>,
	Martin Wilck <martin.wilck@...fujitsu.com>,
	Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH RFC v2 0/2] Fix procfs PCI resources mmap

On Fri, Oct 24, 2014 at 05:28:04PM +0100, Lorenzo Pieralisi wrote:
> The way PCI memory resources are exported to user space through procfs
> is not uniform across architectures. In particular, some architectures
> (ie SPARC) export the resource PCI bus address to user space, whereas
> others (ARM, PowerPC, Microblaze) export the resource CPU physical address.
> This convention should be followed when it comes to passing the pgoff
> values to the mmap syscall to map the resource in question.
> 
> Consequently, the checks applied to the offset passed to the mmap syscall
> (in pci_mmap_fits()) are to be interpreted differently on different
> architectures, and in particular they should match the values exported to
> user space through the pci_resource_to_user() conversion function.
> 
> This patch series addresses two issues. First patch applies the
> pci_resource_to_user() filter to the PCI resource that is being
> mapped in order to carry out a proper check against the pgoff passed
> from user space. Second patch fixes the way the pgoff is handled in
> the ARM pci_mmap_page_range() implementation.

I appreciate it is hardly number one priority and by no means urgent,
but I would like to get some comments if possible on patch 1 since patch
2, that is a fix for ARM, relies on the approach we go for in order to
fix the pci_mmap_fits() behaviour (patch 1).

Comments welcome.

Thanks,
Lorenzo

> 
> v1 posting:
> 
> http://marc.info/?l=linux-kernel&m=141337461318554&w=2
> 
> v1 => v2
> - Reworded commit log as per RMK comments
> 
> Lorenzo Pieralisi (2):
>   drivers: pci: fix pci_mmap_fits() implementation for procfs mmap
>   arm: kernel: fix pci_mmap_page_range() offset calculation
> 
>  arch/arm/kernel/bios32.c | 10 ++--------
>  drivers/pci/pci-sysfs.c  | 13 ++++++++-----
>  2 files changed, 10 insertions(+), 13 deletions(-)
> 
> -- 
> 2.1.2
> 
> 

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