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SubjectRe: [PATCH 00/59] Introduce credentials
Alan Cox <> wrote:

> > We get a number of things:
> >
> > (1) Multiple credential changes all happen simultaneously (setresuid() for
> > example). The new set of credentials is committed with a single RCU
> > assignment.
> Makes sense - except for the question of bounding memory utilisation.

Would it make sense to call synchronise_rcu() from commit_creds() or from
setuid()/setresuid()/setgroups()/etc. to make sure that some user process

while (1)

doesn't run the system out of memory by having loads of frees waiting in RCU's
queues because put_cred() uses call_rcu() to defer the destruction.


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