Re: [PATCH] PCI/proc: Warn on writes to kernel-exclusive config space regions

["Krzysztof Wilczyński" <kwilczynski@kernel.org>]

Hello,

> Currently, a driver can claim a region of a device's config space as
> exclusive using pci_request_config_region_exclusive(), after which a
> write to that region originating from user space is expected to emit a
> warning and taint the kernel.  The check is advisory only, as the write
> itself is still allowed to proceed.
> 
> Since commit 278294798ac9 ("PCI: Allow drivers to request exclusive
> config regions"), the sysfs config space attribute performs this check
> in pci_write_config(), but the procfs interface was never updated.  A
> write performed through /proc/bus/pci/BB/DD.F therefore bypasses the
> detection entirely, even though both interfaces offer the same level
> of access.
> 
> Thus, add the same resource_is_exclusive() check to proc_bus_pci_write().

Applied to the procfs branch.

Thank you!

	Krzysztof