On Mon, Feb 16, 2026 at 11:00 AM Pratyush Yadav <pratyush@kernel.org> wrote:
>
> From: "Pratyush Yadav (Google)" <pratyush@kernel.org>
>
> Hi,
>
> This series adds support for preserving file seals when preserving a
> memfd using LUO. Patch 1 exports some memfd seal manipulation functions
> and patch 2 adds support for preserving them. Since it makes changes to
> the serialized data structure for memfd, it also bumps the version
> number.
>
> Changes in v2:
> - Define the set of seals supported by this version. Support for any
> other seal would need a version bump. Make sure the memfd only has
> this set of seals. Reject any that don't.
>
> - Make seals a u32 since uABI defined it as an int. Change the
> __reserved into flags.
>
> Pratyush Yadav (Google) (2):
> memfd: export memfd_{add,get}_seals()
> mm: memfd_luo: preserve file seals
>
> include/linux/kho/abi/memfd.h | 18 +++++++++++++++++-
> include/linux/memfd.h | 12 ++++++++++++
> mm/memfd.c | 4 ++--
> mm/memfd_luo.c | 35 +++++++++++++++++++++++++++++++++--
> 4 files changed, 64 insertions(+), 5 deletions(-)
>
> --
> 2.53.0.335.g19a08e0c02-goog
>
Tested-by: Samiullah Khawaja <skhawaja@google.com>
Tested with IOMMU persistence patch series using iommufd_liveupdate test.