Description: DoS through vfio/type1 DMA mappings
References:
 https://www.openwall.com/lists/oss-security/2019/04/03/1
 https://lore.kernel.org/lkml/155414977872.12780.13728555131525362206.stgit@gimli.home/T/#u
 https://bugzilla.redhat.com/show_bug.cgi?id=1689426
Notes:
Bugs:
upstream: released (5.1-rc4) [492855939bdb59c6f947b0b5b44af9ad82b7e38c]
4.19-upstream-stable: released (4.19.38) [f7b467ad1be0478f0341afa8a9ac112732def088]
4.9-upstream-stable: released (4.9.173) [4f97abd571ec3d56c50a2edfe0932059f4549afa]
3.16-upstream-stable: released (3.16.66) [d3334471c34797ab1729cbadddd411118d51c584]
sid: released (4.19.37-1) [bugfix/all/vfio-type1-Limit-DMA-mappings-per-container.patch]
4.19-buster-security: N/A "Fixed before branching point"
4.9-stretch-security: released (4.9.168-1+deb9u5) [bugfix/all/vfio-type1-limit-dma-mappings-per-container.patch]
3.16-jessie-security: released (3.16.68-1)