Will Deacon 812e6380b5 virtio: force vring descriptors to be allocated from lowmem ...

commit b92b1b89a3 upstream.

Virtio devices may attempt to add descriptors to a virtqueue from atomic
context using GFP_ATOMIC allocation. This is problematic because such
allocations can fall outside of the lowmem mapping, causing virt_to_phys
to report bogus physical addresses which are subsequently passed to
userspace via the buffers for the virtual device.

This patch masks out __GFP_HIGH and __GFP_HIGHMEM from the requested
flags when allocating descriptors for a virtqueue. If an atomic
allocation is requested and later fails, we will return -ENOSPC which
will be handled by the driver.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2013-01-11 09:03:36 -08:00

..

config.c

…

Kconfig

…

Makefile

…

virtio_balloon.c

virtio balloon: kill tell-host-first logic

2011-05-30 11:14:13 +09:30

virtio_pci.c

virtio-pci: fix use after free

2011-11-21 14:31:14 -08:00

virtio_ring.c

virtio: force vring descriptors to be allocated from lowmem

2013-01-11 09:03:36 -08:00

virtio.c

virtio: fix format of sysfs driver/vendor files

2010-11-24 15:21:12 +10:30