On Mon, May 20, 2019 at 04:41:37PM +0200, Miklos Szeredi wrote:
On Wed, May 15, 2019 at 03:26:47PM -0400, Vivek Goyal wrote:
> If fuse daemon is started with cache=never, fuse falls back to direct IO.
> In that write path we don't call file_remove_privs() and that means setuid
> bit is not cleared if unpriviliged user writes to a file with setuid bit set.
> pjdfstest chmod test 12.t tests this and fails.
I think better sulution is to tell the server if the suid bit needs to be
removed, so it can do so in a race free way.
Here's the kernel patch, and I'll reply with the libfuse patch.
Here are the patches for libfuse and passthrough_ll.