Re: [PATCH v2 02/30] fuse: Clear setuid bit even in cache=never path

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.