diff options
| author | Christoph Hellwig <hch@lst.de> | 2017-01-09 08:56:23 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-19 20:18:03 +0100 |
| commit | 199c89fd32b2a127f12d5614a701e275f7f5a10f (patch) | |
| tree | 8ffb046ec65de51d5e4282b9322ac422a66985a4 /.get_maintainer.ignore | |
| parent | 6c6ae8c43df99284b3260082b43b5858b701bd5e (diff) | |
virtio_blk: avoid DMA to stack for the sense buffer
commit a14d749fcebe97ddf6af6db3d1f6ece85c9ddcb9 upstream.
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>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to '.get_maintainer.ignore')
0 files changed, 0 insertions, 0 deletions