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+QEMU: block/vvfat driver issues
+
+Nathan Huckleberry <email address hidden> has reported following issues in the block/vvfat driver for the virtual VFAT file system image, used to share a host system directory with a guest VM.
+
+Please note:
+  -> https://www.qemu.org/docs/master/system/images.html#virtual-fat-disk-images
+
+Virtual VFAT read/write support is available only for (beta) testing purposes.
+
+Following issues are reproducible with:
+
+   host)$ ./bin/qemu-system-x86_64 -nographic -enable-kvm \
+              -drive file=fat:rw:/tmp/var/run/,index=2  -m 2048 /var/lib/libvirt/images/f27vm.qcow2
+
+  guest)# mount -t vfat /dev/sdb1 /mnt/
+
+The attached reproducers (run inside a guest) include:
+
+1. dir.sh: - directory traversal on the host
+   - It creates a file under /mnt/yyyy
+   - Then edits the VFAT directory entry to make it -> /mnt/../y
+   - The handle_renames_and_mkdirs() routine does not check this new file name
+     and creates a file outside of the shared directory on the host
+
+2. dos.sh: hits an assertion failure in vvfat driver
+   - Creates a deep directory tree like - /mnt/0/1/2/3/4/5/6/../29/30/
+   - While updating vvfat commits, driver hits an assertion in
+     handle_renames_and_mkdirs
+       ...
+       } else if (commit->action == ACTION_MKDIR) {
+           ...
+           assert(j < s->mapping.next);    <== it fails
+
+3. read.sh: reads past vvfat directory entries
+   - Creates a file with: echo "x" > /mnt/a
+   - Reads past VVFAT directory entry structure with
+
+       # head -c 1000000 $MNTDEV | xxd | grep x -A 512
+
+   - It may disclose some heap addresses.
+
+4. write.sh: heap buffer overflow
+   - Creates large number of files as /mnt/file[1..35]
+   - while syncing directory tree with the host, driver hits an overflow
+     while doing memmove(3) in array_roll() routine
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