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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: David Hildenbrand <david@redhat.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Hanjun Guo <guohanjun@huawei.com>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	virtualization@lists.linux-foundation.org, linux-mm@kvack.org
Subject: [PATCH v2 0/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem
Date: Mon, 16 Aug 2021 16:25:02 +0200	[thread overview]
Message-ID: <20210816142505.28359-1-david@redhat.com> (raw)

Let's add the basic infrastructure to exclude some physical memory
regions completely from /dev/mem access, on any architecture and under
any system configuration (independent of CONFIG_STRICT_DEVMEM and
independent of "iomem=").

Use it for virtio-mem, to disallow mapping any virtio-mem memory via
/dev/mem to user space after the virtio-mem driver was loaded: there is
no sane use case to access the device-managed memory region via /dev/mem
once the driver is actively (un)plugging memory within that region and
we want to make sure that nobody will accidentially access unplugged
memory in a sane environment.

Details can be found in patch #1.

v1 -> v2:
- "/dev/mem: disallow access to explicitly excluded system RAM regions"
-- Introduce and use for_each_resource() and next_resource_skip_children()
-- s/iomem_range_contains_excluded/iomem_range_contains_excluded_devmem/
- "kernel/resource: cleanup and optimize iomem_is_exclusive()"
-- Use for_each_resource()

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: virtualization@lists.linux-foundation.org
Cc: linux-mm@kvack.org

David Hildenbrand (3):
  /dev/mem: disallow access to explicitly excluded system RAM regions
  virtio-mem: disallow mapping virtio-mem memory via /dev/mem
  kernel/resource: cleanup and optimize iomem_is_exclusive()

 drivers/char/mem.c          | 22 ++++++--------
 drivers/virtio/virtio_mem.c |  4 ++-
 include/linux/ioport.h      |  1 +
 kernel/resource.c           | 60 +++++++++++++++++++++++++++++++++----
 lib/Kconfig.debug           |  4 ++-
 5 files changed, 71 insertions(+), 20 deletions(-)


base-commit: 7c60610d476766e128cc4284bb6349732cbd6606
-- 
2.31.1


             reply	other threads:[~2021-08-16 14:25 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16 14:25 David Hildenbrand [this message]
2021-08-16 14:25 ` [PATCH v2 1/3] /dev/mem: disallow access to explicitly excluded system RAM regions David Hildenbrand
2021-08-25  0:58   ` Dan Williams
2021-08-25  7:23     ` David Hildenbrand
2021-08-25 17:07       ` Dan Williams
2021-08-25 17:27         ` David Hildenbrand
2021-08-16 14:25 ` [PATCH v2 2/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem David Hildenbrand
2021-08-16 14:25 ` [PATCH v2 3/3] kernel/resource: cleanup and optimize iomem_is_exclusive() David Hildenbrand
2021-08-23 19:14 ` [PATCH v2 0/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem David Hildenbrand

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