Robin Murphy 73bc8a5e8e dma-direct: don't over-decrypt memory ... commit 4a37f3dd9a upstream. The original x86 sev_alloc() only called set_memory_decrypted() on memory returned by alloc_pages_node(), so the page order calculation fell out of that logic. However, the common dma-direct code has several potential allocators, not all of which are guaranteed to round up the underlying allocation to a power-of-two size, so carrying over that calculation for the encryption/decryption size was a mistake. Fix it by rounding to a *number* of pages, rather than an order. Until recently there was an even worse interaction with DMA_DIRECT_REMAP where we could have ended up decrypting part of the next adjacent vmalloc area, only averted by no architecture actually supporting both configs at once. Don't ask how I found that one out... Fixes: c10f07aa27 ("dma/direct: Handle force decryption for DMA coherent buffers in common code") Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: David Rientjes <rientjes@google.com> [ backport the functional change without all the prior refactoring ] Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-06-22 14:13:20 +02:00
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coherent.c	dma-mapping: split <linux/dma-mapping.h>	2020-10-06 07:07:03 +02:00
contiguous.c	dma-mapping updates for 5.10	2020-10-15 14:43:29 -07:00
debug.c	dma-debug: make things less spammy under memory pressure	2022-06-22 14:13:13 +02:00
debug.h	dma-mapping: move dma-debug.h to kernel/dma/	2020-10-06 07:07:05 +02:00
direct.c	dma-direct: don't over-decrypt memory	2022-06-22 14:13:20 +02:00
direct.h	dma-direct: avoid redundant memory sync for swiotlb	2022-04-20 09:23:30 +02:00
dummy.c	dma-mapping: split <linux/dma-mapping.h>	2020-10-06 07:07:03 +02:00
Kconfig	dma-mapping: merge <linux/dma-contiguous.h> into <linux/dma-map-ops.h>	2020-10-06 07:07:04 +02:00
Makefile	dma-mapping: move dma_common_{mmap,get_sgtable} out of mapping.c	2020-09-11 09:14:56 +02:00
mapping.c	dma-mapping: move large parts of <linux/dma-direct.h> to kernel/dma	2020-10-06 07:07:06 +02:00
ops_helpers.c	dma-mapping: handle vmalloc addresses in dma_common_{mmap,get_sgtable}	2021-07-28 14:35:38 +02:00
pool.c	dma/pool: create dma atomic pool only if dma zone has managed pages	2022-01-27 10:53:44 +01:00
remap.c	dma-mapping: move more functions to dma-map-ops.h	2020-10-20 10:41:07 +02:00
swiotlb.c	Reinstate some of "swiotlb: rework "fix info leak with DMA_FROM_DEVICE""	2022-05-25 09:17:55 +02:00
virt.c	dma-mapping: split <linux/dma-mapping.h>	2020-10-06 07:07:03 +02:00