From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
[Stable backport of 6829e274a623 to 3.14.y]
Buffers allocated by dma_alloc_coherent() are always zeroed on Alpha,
ARM (32bit), MIPS, PowerPC, x86/x86_64 and probably other architectures.
It turned out that some drivers rely on this 'feature'. Allocated buffer
might be also exposed to userspace with dma_mmap() call, so clearing it
is desired from security point of view to avoid exposing random memory
to userspace. This patch unifies dma_alloc_coherent() behavior on ARM64
architecture with other implementations by unconditionally zeroing
allocated buffer.
Cc: <stable@xxxxxxxxxxxxxxx> # v3.14 only
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
[will: ported to 3.14.y]
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
---
arch/arm64/mm/dma-mapping.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 3974881388bb..b76159a153a5 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -54,8 +54,7 @@ static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size,
*dma_handle = phys_to_dma(dev, page_to_phys(page));
addr = page_address(page);
- if (flags & __GFP_ZERO)
- memset(addr, 0, size);
+ memset(addr, 0, size);
return addr;
} else {
return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
--
2.1.4
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