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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
-
-
-
-This ticket has been transferred to QEMU's new bug tracker here:
-https://gitlab.com/qemu-project/qemu/-/issues/272
-... thus closing the issue on Launchpad now.
-