Hi, > > > qemu test branch: > > > https://git.kraxel.org/cgit/qemu/log/?h=sirius/udmabuf ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > > + if (!shmem_mapping(file_inode(ubuf->filp)->i_mapping)) > > > + goto err_free_ubuf; > > Can/should we test here that the memfd has a locked down size here? Makes sense. Suggested way to check that? unstatic memfd_get_seals() function (mm/shmem.c)? Or is there some better way? Also which seals should we require? Is F_SEAL_SHRINK enough? > On that: Link to userspace patches/git tree using this would be nice. See above. cheers, Gerd
