On Sun, Aug 18, 2019 at 11:11:54AM -0400, Theodore Y. Ts'o wrote: > Note that of the mainstream file systems, ext4 and xfs don't guarantee > that it's safe to blindly take maliciously provided file systems, such > as those provided by a untrusted container, and mount it on a file > system without problems. As I recall, one of the XFS developers > described file system fuzzing reports as a denial of service attack on > the developers. I think this greatly misrepresents the general attitute of the XFS developers. We take sanity checks for the modern v5 on disk format very series, and put a lot of effort into handling corrupted file systems as good as possible, although there are of course no guaranteeѕ. The quote that you've taken out of context is for the legacy v4 format that has no checksums and other integrity features.
