Re: [PATCH] fuse: don't truncate cached, mutated symlink

[Christian Brauner <brauner@kernel.org>]

On Thu, 20 Feb 2025 11:02:58 +0100, Miklos Szeredi wrote:
> Fuse allows the value of a symlink to change and this property is exploited
> by some filesystems (e.g. CVMFS).
> 
> It has been observed, that sometimes after changing the symlink contents,
> the value is truncated to the old size.
> 
> This is caused by fuse_getattr() racing with fuse_reverse_inval_inode().
> fuse_reverse_inval_inode() updates the fuse_inode's attr_version, which
> results in fuse_change_attributes() exiting before updating the cached
> attributes
> 
> [...]

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: don't truncate cached, mutated symlink
      https://git.kernel.org/vfs/vfs/c/b4c173dfbb6c