[PATCH v1 0/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem

From: David Hildenbrand
Date: Wed Aug 11 2021 - 16:36:31 EST


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.

Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Hanjun Guo <guohanjun@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx

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 | 61 ++++++++++++++++++++++++++++++++-----
lib/Kconfig.debug | 4 ++-
5 files changed, 69 insertions(+), 23 deletions(-)

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2.31.1