This is a note to let you know that I've just added the patch titled
arm64: dma-mapping: always clear allocated buffers
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-dma-mapping-always-clear-allocated-buffers.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6829e274a623187c24f7cfc0e3d35f25d087fcc5 Mon Sep 17 00:00:00 2001
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Date: Thu, 23 Apr 2015 12:46:16 +0100
Subject: arm64: dma-mapping: always clear allocated buffers
From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
commit 6829e274a623187c24f7cfc0e3d35f25d087fcc5 upstream.
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.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
[will: ported to 3.14.y]
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/dma-mapping.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -54,8 +54,7 @@ static void *arm64_swiotlb_alloc_coheren
*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);
Patches currently in stable-queue which might be from m.szyprowski@xxxxxxxxxxx are
queue-3.14/arm64-dma-mapping-always-clear-allocated-buffers.patch
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