Will Deacon b92b1b89a3 virtio: force vring descriptors to be allocated from lowmem ... 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. Cc: stable@kernel.org Cc: Sasha Levin <levinsasha928@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>		2012-10-22 18:19:49 +10:30
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config.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
Kconfig	virtio: remove CONFIG_VIRTIO_RING	2012-09-28 15:05:15 +09:30
Makefile	virtio: remove CONFIG_VIRTIO_RING	2012-09-28 15:05:15 +09:30
virtio.c	virtio: don't crash when device is buggy	2012-09-28 15:05:16 +09:30
virtio_balloon.c	virtio-balloon: fix add/get API use	2012-07-09 09:07:22 +09:30
virtio_mmio.c	virtio_mmio: Don't attempt to create empty virtqueues	2012-09-28 15:05:16 +09:30
virtio_pci.c	drivers/virtio/virtio_pci.c: fix error return code	2012-09-28 15:05:16 +09:30
virtio_ring.c	virtio: force vring descriptors to be allocated from lowmem	2012-10-22 18:19:49 +10:30