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| author | Marek Szyprowski <[email protected]> | 2015-04-23 11:46:16 +0000 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2015-04-27 10:39:50 +0000 |
| commit | 6829e274a623187c24f7cfc0e3d35f25d087fcc5 (patch) | |
| tree | a6ca873b29878ee7bc8c328af8a64bae0f49a37e /net/switchdev/switchdev.c | |
| parent | ARM64: Enable CONFIG_GENERIC_IRQ_SHOW_LEVEL (diff) | |
| download | kernel-6829e274a623187c24f7cfc0e3d35f25d087fcc5.tar.gz kernel-6829e274a623187c24f7cfc0e3d35f25d087fcc5.zip | |
arm64: dma-mapping: always clear allocated buffers
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: <[email protected]> # v3.14+
Signed-off-by: Marek Szyprowski <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'net/switchdev/switchdev.c')
0 files changed, 0 insertions, 0 deletions