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dma-mapping: zero memory returned from dma_alloc_*

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If we want to map memory from the DMA allocator to userspace it must be
zeroed at allocation time to prevent stale data leaks.   We already do
this on most common architectures, but some architectures don't do this
yet, fix them up, either by passing GFP_ZERO when we use the normal page
allocator or doing a manual memset otherwise.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Acked-by: Sam Ravnborg <sam@ravnborg.org> [sparc]
This commit is contained in:
Christoph Hellwig 2018-12-14 09:00:40 +01:00
parent 6c503d0d88
commit 518a2f1925
14 changed files with 18 additions and 15 deletions
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2
kernel/dma/virt.c
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@ -13,7 +13,7 @@ static void *dma_virt_alloc(struct device *dev, size_t size,
{
void *ret;
ret = (void *)__get_free_pages(gfp, get_order(size));
ret = (void *)__get_free_pages(gfp | __GFP_ZERO, get_order(size));
if (ret)
*dma_handle = (uintptr_t)ret;
return ret;