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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "DRI Development" <dri-devel@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"KVM list" <kvm@vger.kernel.org>, "Linux MM" <linux-mm@kvack.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>,
	linux-s390 <linux-s390@vger.kernel.org>,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"John Hubbard" <jhubbard@nvidia.com>,
	"Jérôme Glisse" <jglisse@redhat.com>, "Jan Kara" <jack@suse.cz>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"David Hildenbrand" <david@redhat.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: [PATCH v2 14/17] resource: Move devmem revoke code to resource framework
Date: Fri, 9 Oct 2020 11:32:09 -0300	[thread overview]
Message-ID: <20201009143209.GS5177@ziepe.ca> (raw)
In-Reply-To: <CAKMK7uFpPP-Q0jC0vM7vYPEcg0m4NzTw+Ld=swdTF3BgMX5Qug@mail.gmail.com>

On Fri, Oct 09, 2020 at 04:24:45PM +0200, Daniel Vetter wrote:
> On Fri, Oct 9, 2020 at 2:31 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
> >
> > On Fri, Oct 09, 2020 at 09:59:31AM +0200, Daniel Vetter wrote:
> >
> > > +struct address_space *iomem_get_mapping(void)
> > > +{
> > > +     return iomem_inode->i_mapping;
> >
> > This should pair an acquire with the release below
> >
> > > +     /*
> > > +      * Publish /dev/mem initialized.
> > > +      * Pairs with smp_load_acquire() in revoke_iomem().
> > > +      */
> > > +     smp_store_release(&iomem_inode, inode);
> >
> > However, this seems abnormal, initcalls rarely do this kind of stuff
> > with global data..
> >
> > The kernel crashes if this fs_initcall is raced with
> > iomem_get_mapping() due to the unconditional dereference, so I think
> > it can be safely switched to a simple assignment.
> 
> Ah yes I checked this all, but forgot to correctly annotate the
> iomem_get_mapping access. For reference, see b34e7e298d7a ("/dev/mem:
> Add missing memory barriers for devmem_inode").

Oh yikes, so revoke_iomem can run concurrently during early boot,
tricky.

> The reasons for the annotations is that iomem requests can happen
> fairly early, way before fs_initcalls happen. That means revoke_iomem
> needs to check for that and bail out if we race - nothing bad can
> happen since userspace isn't running at this point anyway. And
> apparently it needs to be a full acquire fence since we don't just
> write a value, but need a barrier for the struct stuff.

Yes, if that is what is happening it release/acquire is needed.

Jason

WARNING: multiple messages have this Message-ID
From: Jason Gunthorpe <jgg@ziepe.ca>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-s390 <linux-s390@vger.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
	"Jan Kara" <jack@suse.cz>, "Kees Cook" <keescook@chromium.org>,
	"KVM list" <kvm@vger.kernel.org>,
	"David Hildenbrand" <david@redhat.com>,
	"John Hubbard" <jhubbard@nvidia.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	"DRI Development" <dri-devel@lists.freedesktop.org>,
	"Linux MM" <linux-mm@kvack.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>
Subject: Re: [PATCH v2 14/17] resource: Move devmem revoke code to resource framework
Date: Fri, 9 Oct 2020 11:32:09 -0300	[thread overview]
Message-ID: <20201009143209.GS5177@ziepe.ca> (raw)
In-Reply-To: <CAKMK7uFpPP-Q0jC0vM7vYPEcg0m4NzTw+Ld=swdTF3BgMX5Qug@mail.gmail.com>

On Fri, Oct 09, 2020 at 04:24:45PM +0200, Daniel Vetter wrote:
> On Fri, Oct 9, 2020 at 2:31 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
> >
> > On Fri, Oct 09, 2020 at 09:59:31AM +0200, Daniel Vetter wrote:
> >
> > > +struct address_space *iomem_get_mapping(void)
> > > +{
> > > +     return iomem_inode->i_mapping;
> >
> > This should pair an acquire with the release below
> >
> > > +     /*
> > > +      * Publish /dev/mem initialized.
> > > +      * Pairs with smp_load_acquire() in revoke_iomem().
> > > +      */
> > > +     smp_store_release(&iomem_inode, inode);
> >
> > However, this seems abnormal, initcalls rarely do this kind of stuff
> > with global data..
> >
> > The kernel crashes if this fs_initcall is raced with
> > iomem_get_mapping() due to the unconditional dereference, so I think
> > it can be safely switched to a simple assignment.
> 
> Ah yes I checked this all, but forgot to correctly annotate the
> iomem_get_mapping access. For reference, see b34e7e298d7a ("/dev/mem:
> Add missing memory barriers for devmem_inode").

Oh yikes, so revoke_iomem can run concurrently during early boot,
tricky.

> The reasons for the annotations is that iomem requests can happen
> fairly early, way before fs_initcalls happen. That means revoke_iomem
> needs to check for that and bail out if we race - nothing bad can
> happen since userspace isn't running at this point anyway. And
> apparently it needs to be a full acquire fence since we don't just
> write a value, but need a barrier for the struct stuff.

Yes, if that is what is happening it release/acquire is needed.

Jason

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID
From: Jason Gunthorpe <jgg@ziepe.ca>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-s390 <linux-s390@vger.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
	"Jan Kara" <jack@suse.cz>, "Kees Cook" <keescook@chromium.org>,
	"KVM list" <kvm@vger.kernel.org>,
	"David Hildenbrand" <david@redhat.com>,
	"John Hubbard" <jhubbard@nvidia.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	"DRI Development" <dri-devel@lists.freedesktop.org>,
	"Linux MM" <linux-mm@kvack.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>
Subject: Re: [PATCH v2 14/17] resource: Move devmem revoke code to resource framework
Date: Fri, 9 Oct 2020 11:32:09 -0300	[thread overview]
Message-ID: <20201009143209.GS5177@ziepe.ca> (raw)
In-Reply-To: <CAKMK7uFpPP-Q0jC0vM7vYPEcg0m4NzTw+Ld=swdTF3BgMX5Qug@mail.gmail.com>

On Fri, Oct 09, 2020 at 04:24:45PM +0200, Daniel Vetter wrote:
> On Fri, Oct 9, 2020 at 2:31 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
> >
> > On Fri, Oct 09, 2020 at 09:59:31AM +0200, Daniel Vetter wrote:
> >
> > > +struct address_space *iomem_get_mapping(void)
> > > +{
> > > +     return iomem_inode->i_mapping;
> >
> > This should pair an acquire with the release below
> >
> > > +     /*
> > > +      * Publish /dev/mem initialized.
> > > +      * Pairs with smp_load_acquire() in revoke_iomem().
> > > +      */
> > > +     smp_store_release(&iomem_inode, inode);
> >
> > However, this seems abnormal, initcalls rarely do this kind of stuff
> > with global data..
> >
> > The kernel crashes if this fs_initcall is raced with
> > iomem_get_mapping() due to the unconditional dereference, so I think
> > it can be safely switched to a simple assignment.
> 
> Ah yes I checked this all, but forgot to correctly annotate the
> iomem_get_mapping access. For reference, see b34e7e298d7a ("/dev/mem:
> Add missing memory barriers for devmem_inode").

Oh yikes, so revoke_iomem can run concurrently during early boot,
tricky.

> The reasons for the annotations is that iomem requests can happen
> fairly early, way before fs_initcalls happen. That means revoke_iomem
> needs to check for that and bail out if we race - nothing bad can
> happen since userspace isn't running at this point anyway. And
> apparently it needs to be a full acquire fence since we don't just
> write a value, but need a barrier for the struct stuff.

Yes, if that is what is happening it release/acquire is needed.

Jason
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2020-10-09 14:32 UTC|newest]

Thread overview: 214+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-09  7:59 [PATCH v2 00/17] follow_pfn and other iomap races Daniel Vetter
2020-10-09  7:59 ` Daniel Vetter
2020-10-09  7:59 ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 01/17] drm/exynos: Stop using frame_vector helpers Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-16  7:42   ` John Hubbard
2020-10-16  7:42     ` John Hubbard
2020-10-16  7:42     ` John Hubbard
2020-10-09  7:59 ` [PATCH v2 02/17] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 03/17] misc/habana: Stop using frame_vector helpers Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-10 20:26   ` Oded Gabbay
2020-10-10 20:26     ` Oded Gabbay
2020-10-10 20:26     ` Oded Gabbay
2020-10-10 21:32     ` Daniel Vetter
2020-10-10 21:32       ` Daniel Vetter
2020-10-10 21:32       ` Daniel Vetter
2020-10-10 21:41       ` Daniel Vetter
2020-10-10 21:41         ` Daniel Vetter
2020-10-10 21:41         ` Daniel Vetter
2020-10-10 21:47         ` Oded Gabbay
2020-10-10 21:47           ` Oded Gabbay
2020-10-10 21:47           ` Oded Gabbay
2020-10-16  7:45   ` John Hubbard
2020-10-16  7:45     ` John Hubbard
2020-10-16  7:45     ` John Hubbard
2020-10-09  7:59 ` [PATCH v2 04/17] misc/habana: Use FOLL_LONGTERM for userptr Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 05/17] mm/frame-vector: Use FOLL_LONGTERM Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-16  7:54   ` John Hubbard
2020-10-16  7:54     ` John Hubbard
2020-10-16  7:54     ` John Hubbard
2020-10-16  8:03     ` Daniel Vetter
2020-10-16  8:03       ` Daniel Vetter
2020-10-16  8:03       ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 06/17] media: videobuf2: Move frame_vector into media subsystem Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09 10:14   ` Mauro Carvalho Chehab
2020-10-09 10:14     ` Mauro Carvalho Chehab
2020-10-09 10:14     ` Mauro Carvalho Chehab
2020-10-09 16:57     ` Daniel Vetter
2020-10-09 16:57       ` Daniel Vetter
2020-10-09 16:57       ` Daniel Vetter
2020-10-09 16:57       ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 07/17] mm: Close race in generic_access_phys Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 08/17] s390/pci: Remove races against pte updates Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-12 14:03   ` Niklas Schnelle
2020-10-12 14:03     ` Niklas Schnelle
2020-10-12 14:03     ` Niklas Schnelle
2020-10-12 14:19     ` Daniel Vetter
2020-10-12 14:19       ` Daniel Vetter
2020-10-12 14:19       ` Daniel Vetter
2020-10-12 14:19       ` Daniel Vetter
2020-10-12 14:39       ` Niklas Schnelle
2020-10-12 14:39         ` Niklas Schnelle
2020-10-12 14:39         ` Niklas Schnelle
2020-10-21  7:55       ` Niklas Schnelle
2020-10-21  7:55         ` Niklas Schnelle
2020-10-21  7:55         ` Niklas Schnelle
2020-10-22  7:39         ` Daniel Vetter
2020-10-22  7:39           ` Daniel Vetter
2020-10-22  7:39           ` Daniel Vetter
2020-10-22  7:39           ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 09/17] mm: Add unsafe_follow_pfn Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09 10:34   ` Mauro Carvalho Chehab
2020-10-09 10:34     ` Mauro Carvalho Chehab
2020-10-09 10:34     ` Mauro Carvalho Chehab
2020-10-09 12:21     ` Jason Gunthorpe
2020-10-09 12:21       ` Jason Gunthorpe
2020-10-09 12:21       ` Jason Gunthorpe
2020-10-09 12:37       ` Mauro Carvalho Chehab
2020-10-09 12:37         ` Mauro Carvalho Chehab
2020-10-09 12:37         ` Mauro Carvalho Chehab
2020-10-09 12:39         ` Mauro Carvalho Chehab
2020-10-09 12:39           ` Mauro Carvalho Chehab
2020-10-09 12:39           ` Mauro Carvalho Chehab
2020-10-09 12:48         ` Jason Gunthorpe
2020-10-09 12:48           ` Jason Gunthorpe
2020-10-09 12:48           ` Jason Gunthorpe
2020-10-09 17:52           ` Daniel Vetter
2020-10-09 17:52             ` Daniel Vetter
2020-10-09 17:52             ` Daniel Vetter
2020-10-09 18:01             ` Jason Gunthorpe
2020-10-09 18:01               ` Jason Gunthorpe
2020-10-09 18:01               ` Jason Gunthorpe
2020-10-09 19:31               ` Daniel Vetter
2020-10-09 19:31                 ` Daniel Vetter
2020-10-09 19:31                 ` Daniel Vetter
2020-10-10  9:21             ` Mauro Carvalho Chehab
2020-10-10  9:21               ` Mauro Carvalho Chehab
2020-10-10  9:21               ` Mauro Carvalho Chehab
2020-10-10 10:53               ` Daniel Vetter
2020-10-10 10:53                 ` Daniel Vetter
2020-10-10 10:53                 ` Daniel Vetter
2020-10-10 11:39                 ` Mauro Carvalho Chehab
2020-10-10 11:39                   ` Mauro Carvalho Chehab
2020-10-10 11:39                   ` Mauro Carvalho Chehab
2020-10-10 11:56                   ` Daniel Vetter
2020-10-10 11:56                     ` Daniel Vetter
2020-10-10 11:56                     ` Daniel Vetter
2020-10-10 17:22             ` Tomasz Figa
2020-10-10 17:22               ` Tomasz Figa
2020-10-10 17:22               ` Tomasz Figa
2020-10-10 21:35               ` Laurent Pinchart
2020-10-10 21:35                 ` Laurent Pinchart
2020-10-10 21:35                 ` Laurent Pinchart
2020-10-10 21:50                 ` Daniel Vetter
2020-10-10 21:50                   ` Daniel Vetter
2020-10-10 21:50                   ` Daniel Vetter
2020-10-11  6:27                   ` Mauro Carvalho Chehab
2020-10-11  6:27                     ` Mauro Carvalho Chehab
2020-10-11  6:27                     ` Mauro Carvalho Chehab
2020-10-11  6:36                     ` Mauro Carvalho Chehab
2020-10-11  6:36                       ` Mauro Carvalho Chehab
2020-10-11  6:36                       ` Mauro Carvalho Chehab
2020-10-10 21:11             ` Laurent Pinchart
2020-10-10 21:11               ` Laurent Pinchart
2020-10-10 21:11               ` Laurent Pinchart
2020-10-12 10:46           ` Marek Szyprowski
2020-10-12 10:46             ` Marek Szyprowski
2020-10-12 10:46             ` Marek Szyprowski
2020-10-12 13:49             ` Daniel Vetter
2020-10-12 13:49               ` Daniel Vetter
2020-10-12 13:49               ` Daniel Vetter
2020-10-10 17:30         ` Tomasz Figa
2020-10-10 17:30           ` Tomasz Figa
2020-10-10 17:30           ` Tomasz Figa
2020-10-09  7:59 ` [PATCH v2 10/17] media/videbuf1|2: Mark follow_pfn usage as unsafe Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-10  9:24   ` Mauro Carvalho Chehab
2020-10-10  9:24     ` Mauro Carvalho Chehab
2020-10-10  9:24     ` Mauro Carvalho Chehab
2020-10-09  7:59 ` [PATCH v2 11/17] vfio/type1: Mark follow_pfn " Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 12/17] PCI: Obey iomem restrictions for procfs mmap Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 13/17] /dev/mem: Only set filp->f_mapping Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 14/17] resource: Move devmem revoke code to resource framework Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09 10:59   ` Greg Kroah-Hartman
2020-10-09 10:59     ` Greg Kroah-Hartman
2020-10-09 10:59     ` Greg Kroah-Hartman
2020-10-09 10:59     ` Greg Kroah-Hartman
2020-10-09 12:31   ` Jason Gunthorpe
2020-10-09 12:31     ` Jason Gunthorpe
2020-10-09 12:31     ` Jason Gunthorpe
2020-10-09 14:24     ` Daniel Vetter
2020-10-09 14:24       ` Daniel Vetter
2020-10-09 14:24       ` Daniel Vetter
2020-10-09 14:32       ` Jason Gunthorpe [this message]
2020-10-09 14:32         ` Jason Gunthorpe
2020-10-09 14:32         ` Jason Gunthorpe
2020-10-09 18:28         ` Dan Williams
2020-10-09 18:28           ` Dan Williams
2020-10-09 18:28           ` Dan Williams
2020-10-15  0:09           ` Jason Gunthorpe
2020-10-15  0:09             ` Jason Gunthorpe
2020-10-15  0:09             ` Jason Gunthorpe
2020-10-15  7:52             ` Daniel Vetter
2020-10-15  7:52               ` Daniel Vetter
2020-10-15  7:52               ` Daniel Vetter
2020-10-15  7:55               ` Daniel Vetter
2020-10-15  7:55                 ` Daniel Vetter
2020-10-15  7:55                 ` Daniel Vetter
2020-10-15 15:29             ` Daniel Vetter
2020-10-15 15:29               ` Daniel Vetter
2020-10-15 15:29               ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 15/17] sysfs: Support zapping of binary attr mmaps Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09 10:58   ` Greg Kroah-Hartman
2020-10-09 10:58     ` Greg Kroah-Hartman
2020-10-09 10:58     ` Greg Kroah-Hartman
2020-10-09 10:58     ` Greg Kroah-Hartman
2020-10-09  7:59 ` [PATCH v2 16/17] PCI: Revoke mappings like devmem Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59 ` [PATCH v2 17/17] drm/i915: Properly request PCI BARs Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  7:59   ` Daniel Vetter
2020-10-09  9:47   ` Ville Syrjälä
2020-10-09  9:47     ` Ville Syrjälä
2020-10-09  9:47     ` Ville Syrjälä
2020-10-09  9:47     ` Ville Syrjälä
2020-10-09 10:01     ` Daniel Vetter
2020-10-09 10:01       ` Daniel Vetter
2020-10-09 10:01       ` Daniel Vetter
2020-10-09 10:41       ` Ville Syrjälä
2020-10-09 10:41         ` Ville Syrjälä
2020-10-09 10:41         ` Ville Syrjälä
2020-10-09 10:41         ` Ville Syrjälä
2020-10-09 14:18         ` Daniel Vetter
2020-10-09 14:18           ` Daniel Vetter
2020-10-09 14:18           ` Daniel Vetter

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