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

[Jeff Layton]

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 is indeed very simple. Here it is today:

	static inline int audit_hash_ino(u32 ino)                            
	{                                                                    
	        return (ino & (AUDIT_INODE_BUCKETS-1));                      
	}       

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?

-- 
Jeff Layton <jlayton at kernel.org>