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mm/memfd_luo: document preservation of file seals

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Commit 8a552d68a8 ("mm: memfd_luo: preserve file seals") started
preserving file seals across live update and restoring them via
memfd_add_seals() on retrieve, but the DOC header was not updated and
still listed seals under "Non-Preserved Properties" as being unsealed
on restore.

Move the Seals entry to the "Preserved Properties" section and describe
the actual behavior, including the MEMFD_LUO_ALL_SEALS restriction that
both preserve and retrieve enforce.

Fixes: 8a552d68a8 ("mm: memfd_luo: preserve file seals")
Signed-off-by: David Carlier <devnexen@gmail.com>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Link: https://patch.msgid.link/20260423125648.152113-2-devnexen@gmail.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
This commit is contained in:
David Carlier 2026-04-23 13:56:48 +01:00 committed by Pasha Tatashin
parent d581fc99d3
commit 7b0b68b2b9
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1 changed files with 5 additions and 4 deletions
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9
mm/memfd_luo.c
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@ -50,6 +50,11 @@
* memfds are always opened with ``O_RDWR`` and ``O_LARGEFILE``. This property
* is maintained.
*
* Seals
* File seals set on the memfd are preserved and re-applied on restore.
* Only seals known to this LUO version (see ``MEMFD_LUO_ALL_SEALS``) may
* be present; preservation fails with ``-EOPNOTSUPP`` otherwise.
*
* Non-Preserved Properties
* ========================
*
@ -61,10 +66,6 @@
* A memfd can be created with the ``MFD_CLOEXEC`` flag that sets the
* ``FD_CLOEXEC`` on the file. This flag is not preserved and must be set
* again after restore via ``fcntl()``.
*
* Seals
* File seals are not preserved. The file is unsealed on restore and if
* needed, must be sealed again via ``fcntl()``.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt