Robin Murphy 0cae511a72 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 10:30:21 +02:00
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coherent.c	dma-mapping: use 'bitmap_zalloc()' when applicable	2021-10-27 08:20:09 +02:00
contiguous.c	cma: factor out minimum alignment requirement	2022-03-22 15:57:05 -07:00
debug.c	dma-debug: change allocation mode from GFP_NOWAIT to GFP_ATIOMIC	2022-06-09 10:29:42 +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 10:30:21 +02:00
direct.h	dma-direct: avoid redundant memory sync for swiotlb	2022-04-14 06:30:39 +02:00
dummy.c	dma-mapping: return error code from dma_dummy_map_sg()	2021-08-09 17:13:06 +02:00
Kconfig	dma-mapping: remove CONFIG_DMA_REMAP	2022-03-03 14:00:57 +03:00
Makefile	dma-mapping: remove CONFIG_DMA_REMAP	2022-03-03 14:00:57 +03:00
map_benchmark.c	dma-mapping: benchmark: extract a common header file for map_benchmark definition	2022-03-10 07:41:14 +01:00
mapping.c	dma-mapping: move pgprot_decrypted out of dma_pgprot	2022-04-01 06:46:51 +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	2022-01-15 16:30:29 +02:00
remap.c	kernel/dma: remove unnecessary unmap_kernel_range	2021-04-30 11:20:40 -07:00
swiotlb.c	dma-mapping updates for Linux 5.18	2022-03-29 08:50:14 -07:00