On Thu, 15 Jun 2023 14:22:24 +0300, Amir Goldstein wrote: > Christian, > > A little while ago, Jan and I realized that an unprivileged overlayfs > mount could be used to avert fanotify permission events that were > requested for an inode or sb on the underlying fs. > > The [v1] patch set was an attempt to implement Miklos' suggestion > (opt-in to query the fake path) which turned out to affet the vfs in > many places, so Miklos and I agreed on a solution that will be less > intrusive for vfs (opt-in to query the real path). > > [...] I incorporated all the fixes suggested by Christoph and the missing decrement of nr_files. --- Applied to the vfs.backing.file branch of the vfs/vfs.git tree. Patches in the vfs.backing.file branch should appear in linux-next soon. Please report any outstanding bugs that were missed during review in a new review to the original patch series allowing us to drop it. It's encouraged to provide Acked-bys and Reviewed-bys even though the patch has now been applied. If possible patch trailers will be updated. tree: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git branch: vfs.backing.file [1/5] fs: rename {vfs,kernel}_tmpfile_open() https://git.kernel.org/vfs/vfs/c/d56e0ddb8fc3 [2/5] fs: use a helper for opening kernel internal files https://git.kernel.org/vfs/vfs/c/cbb0b9d4bbcf [3/5] fs: move kmem_cache_zalloc() into alloc_empty_file*() helpers https://git.kernel.org/vfs/vfs/c/8a05a8c31d06 [4/5] fs: use backing_file container for internal files with "fake" f_path https://git.kernel.org/vfs/vfs/c/62d53c4a1dfe [5/5] ovl: enable fsnotify events on underlying real files https://git.kernel.org/vfs/vfs/c/bc2473c90fca
