Re: [PATCH v2] fuse: reject fuse_notify() pagecache ops on directories

[Christian Brauner <brauner@kernel.org>]

On Tue, 19 May 2026 16:29:38 +0200, Jann Horn wrote:
> The operations FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE allow the
> FUSE daemon to actively write/read pagecache contents.
> 
> For directories with FOPEN_CACHE_DIR, the pagecache is used as
> kernel-internal cache storage, and userspace is not supposed to have
> direct access to this cache - in particular, fuse_parse_cache() will hit
> WARN_ON() if the cache contains bogus data.
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes 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.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] fuse: reject fuse_notify() pagecache ops on directories
      https://git.kernel.org/vfs/vfs/c/ef5728148f16