Date: Wed, 4 Jan 2017 20:42:14 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Matthew Garrett <mjg59@...eos.com> Cc: Kees Cook <keescook@...omium.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, kernel-hardening@...ts.openwall.com Subject: Re: [PATCH] Allow userspace to request device probing even if defer_all_probes is true On Wed, Jan 04, 2017 at 12:11:49PM -0600, Matthew Garrett wrote: > On Wed, Jan 4, 2017 at 3:13 AM, Greg Kroah-Hartman > <gregkh@...uxfoundation.org> wrote: > >> Add a force_probe sysfs node to each device, which if written will > >> trigger a probe even if defer_all_probes is currently true. > > > > Why not just manually trigger the bind of the device? I don't > > understand the problem here that is being addressed, nor do I understand > > how this would be used. More explaination please. > > Userspace doesn't know the order that the kernel will use when > attempting to bind drivers, so punting binding out to userspace may > result in different behaviour. How can the order in which drivers are bound result in different behavior? > The kernel already has the code to do this, so we should just reuse > it. That's fine, but I don't understand the problem you are trying to solve, please explain better. What am I missing here? thanks, greg k-h
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