[PATCH v2 003/110] audit: widen ino fields to u64

[Paul Moore]

On Tue, Mar 3, 2026 at 6:05 AM Jeff Layton <jlayton at kernel.org> wrote:
> On Mon, 2026-03-02 at 18:44 -0500, Paul Moore wrote:
> > On Mon, Mar 2, 2026 at 3:25 PM Jeff Layton <jlayton at kernel.org> wrote:
> > >
> > > inode->i_ino is being widened from unsigned long to u64. The audit
> > > subsystem uses unsigned long ino in struct fields, function parameters,
> > > and local variables that store inode numbers from arbitrary filesystems.
> > > On 32-bit platforms this truncates inode numbers that exceed 32 bits,
> > > which will cause incorrect audit log entries and broken watch/mark
> > > comparisons.
> > >
> > > Widen all audit ino fields, parameters, and locals to u64, and update
> > > the inode format string from %lu to %llu to match.
> > >
> > > Signed-off-by: Jeff Layton <jlayton at kernel.org>
> > > ---
> > >  include/linux/audit.h   | 2 +-
> > >  kernel/audit.h          | 9 ++++-----
> > >  kernel/audit_fsnotify.c | 4 ++--
> > >  kernel/audit_watch.c    | 8 ++++----
> > >  kernel/auditsc.c        | 2 +-
> > >  5 files changed, 12 insertions(+), 13 deletions(-)
> >
> > We should also update audit_hash_ino() in kernel/audit.h.  It is a
> > *very* basic hash function, so I think leaving the function as-is and
> > just changing the inode parameter from u32 to u64 should be fine.

...

> It doesn't look like changing the argument type will make any material
> difference. Given that it should still work without that change, can we
> leave this cleanup for you to do in a follow-on patchset?

I would prefer if you made the change as part of the patch, mainly to
keep a patch record of this being related.

Ideally I'd really like to see kino_t used in the audit code instead
of u64, but perhaps that is done in a later patch that I didn't see.

-- 
paul-moore.com