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SubjectRe: [PATCH v2 1/2] mm: Add an F_SEAL_FS_WRITE seal to memfd
On Wed, Oct 17, 2018 at 08:44:01AM -0700, Daniel Colascione wrote:
> > Even if no one changes these specific flags we still need a lock due
> > to rmw cycles on the field. For example fadvise can set or clear
> > FMODE_RANDOM. It seems to use file->f_lock for synchronization.
>
> Compare-and-exchange will suffice, right?

Only if all users use the compare and exchange, and right now they
don't.

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