[Bug 243252] www/firefox core dumps after r522486 (failed to freeze shm)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243252

--- Comment #16 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Mikhail Teterin from comment #15)
> And that my change allows it to start again -- without completely undoing the FreeBSD-specific patch.

If you break freezing promise then it won't be accepted upstream. And I'm not
interested in adding more downstream-only patches. There's enough rebase churn
even from stuff that *was* submitted upstream but stalled on review for various
reasons.

> People with CAPSICUM enabled will still benefit from the protection it tries to provide.

If cap_rights_limit is undesired then on FreeBSD 13 one can use
memfd_create(MFD_ALLOW_SEALING). However, older FreeBSD versions would require
adjusting ifdefs to ignore SHM_ANON or limiting SHM_ANON to when freezing is
not used.

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