mm/mseal: remove superfluous comments, fix confusion around mm

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Patch series "mm/mseal: further cleanups", v2.

The mseal implementation is still rather confusing, so tighten things up a
little.

The only user of do_mseal() outside of the system call is the
MMAP_PAGE_ZERO process personality - retain better control over how mseal
is utilised by providing mseal_mmap_page_zero() for this instead.

The comments are overly long and confusion, so cut them down so they're a
lot clearer.

Remove confusing mm_struct params (mseal can not be used on remote mm's)
and wrap the actual system call logic into the system call declaration.


This patch (of 3):

Remove comment blocks that don't add value and eliminate any confusion
about whether or not we permit mseal()'ing of remote mm's by not passing
through an mm parameter but rather referencing current->mm in each
function.

Also while we're here, avoid an ugly goto by using an else branch, and
move local parameters declarations into reverse xmas tree order.

No functional change intended.

Link: https://lore.kernel.org/20260717-mseal-fixups-v2-0-0daa0014b813@kernel.org
Link: https://lore.kernel.org/20260717-mseal-fixups-v2-1-0daa0014b813@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Lorenzo Stoakes (ARM) 2026-07-17 18:27:09 +01:00 • committed by Andrew Morton

parent e47b037e42

commit 14dad135d6

1 changed files with 11 additions and 42 deletions

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mm/mseal.c

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