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virtio-blk: undo destructive iov_discard_*() operations

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Fuzzing discovered that virtqueue_unmap_sg() is being called on modified
req->in/out_sg iovecs. This means dma_memory_map() and
dma_memory_unmap() calls do not have matching memory addresses.

Fuzzing discovered that non-RAM addresses trigger a bug:

  void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
                           bool is_write, hwaddr access_len)
  {
      if (buffer != bounce.buffer) {
          ^^^^^^^^^^^^^^^^^^^^^^^

A modified iov->iov_base is no longer recognized as a bounce buffer and
the wrong branch is taken.

There are more potential bugs: dirty memory is not tracked correctly and
MemoryRegion refcounts can be leaked.

Use the new iov_discard_undo() API to restore elem->in/out_sg before
virtqueue_push() is called.

Fixes: 827805a249 ("virtio-blk: Convert VirtIOBlockReq.out to structrue")
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Buglink: https://bugs.launchpad.net/qemu/+bug/1890360
Message-Id: <20200917094455.822379-3-stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-09-17 10:44:54 +01:00
parent 9dd6f7c28e
commit 7bd04a041a
2 changed files with 11 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/hw/virtio/virtio-blk.h
View file

@ -70,6 +70,8 @@ typedef struct VirtIOBlockReq {
int64_t sector_num;
VirtIOBlock *dev;
VirtQueue *vq;
IOVDiscardUndo inhdr_undo;
IOVDiscardUndo outhdr_undo;
struct virtio_blk_inhdr *in;
struct virtio_blk_outhdr out;
QEMUIOVector qiov;