Re: ulimits and memfd(2)

[Theodore Preduta <theo%pta.gg@localhost>]

On 2023-08-11 03:00, Taylor R Campbell wrote:
> So is there a way to limit the memory use of memfd?

You are correct, currently the only limits are via F_SEAL_*.

> Maybe the memfd
> should contribute toward RLIMIT_AS somehow, or something like that?
It could contribute directly to RLIMIT_AS (in the same way that mmap
does it), but then the memory would be double counted when you mmap the
memfd(?), which seems undesirable.

Maybe memfd should respect RLIMIT_FSIZE, since memfds are supposed to
behave like regular files as much as possible.  Also, I think this is
much simpler to add (just an extra check when truncating?).

Theo(dore)