Robin Murphy a48a7f8949 dma-direct: don't over-decrypt memory ... [ Upstream commit 4a37f3dd9a ] 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> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-06-09 10:23:03 +02:00
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Kconfig	Merge branch 'stable/for-linus-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb	2021-09-03 10:34:44 -07:00
Makefile	dma-mapping updates for 5.11:	2020-12-22 13:19:43 -08:00
coherent.c	dma-mapping: make the global coherent pool conditional	2021-08-19 09:02:39 +02:00
contiguous.c	dma-contiguous: fix a typo error in a comment	2020-11-27 10:33:42 +01:00
debug.c	dma-debug: change allocation mode from GFP_NOWAIT to GFP_ATIOMIC	2022-06-09 10:22:37 +02:00
debug.h	dma-debug: teach add_dma_entry() about DMA_ATTR_SKIP_CPU_SYNC	2021-10-18 12:46:45 +02:00
direct.c	dma-direct: don't over-decrypt memory	2022-06-09 10:23:03 +02:00
direct.h	dma-direct: avoid redundant memory sync for swiotlb	2022-04-20 09:34:21 +02:00
dummy.c	dma-mapping: return error code from dma_dummy_map_sg()	2021-08-09 17:13:06 +02:00
map_benchmark.c	dma-mapping: benchmark: Add support for multi-pages map/unmap	2021-04-02 16:41:08 +02:00
mapping.c	dma-mapping: remove bogus test for pfn_valid from dma_map_resource	2022-04-27 14:38:50 +02:00
ops_helpers.c	dma-mapping: handle vmalloc addresses in dma_common_{mmap,get_sgtable}	2021-07-16 11:30:26 +02:00
pool.c	dma/pool: create dma atomic pool only if dma zone has managed pages	2022-01-27 11:03:00 +01:00
remap.c	kernel/dma: remove unnecessary unmap_kernel_range	2021-04-30 11:20:40 -07:00
swiotlb.c	swiotlb: Support aligned swiotlb buffers	2022-04-08 14:24:17 +02:00