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| author | Christoph Hellwig <hch@lst.de> | 2017-01-09 18:56:23 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-01-10 23:30:50 +0300 |
| commit | a14d749fcebe97ddf6af6db3d1f6ece85c9ddcb9 (patch) | |
| tree | b441577383d9ca1586799d28a031d99e9d6e967d /drivers/block/nbd.c | |
| parent | dd545b52a3e1efd9f2c6352dbe95ccd0c53461cc (diff) | |
| download | linux-a14d749fcebe97ddf6af6db3d1f6ece85c9ddcb9.tar.xz | |
virtio_blk: avoid DMA to stack for the sense buffer
Most users of BLOCK_PC requests allocate the sense buffer on the stack,
so to avoid DMA to the stack copy them to a field in the heap allocated
virtblk_req structure. Without that any attempt at SCSI passthrough I/O,
including the SG_IO ioctl from userspace will crash the kernel. Note that
this includes running tools like hdparm even when the host does not have
SCSI passthrough enabled.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/nbd.c')
0 files changed, 0 insertions, 0 deletions