[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 #11 from rozhuk.im at gmail.com ---
Some thing like:
if (cap_rights_limit(mapped_file_, &rights) != 0 && ENOSYS != errno) {


> Failing to freeze means an untrusted child process has write access.
> The feature is currently used by parent process to pass read-only snapshot
> of preferences to content processes.

It works many years without RO access, nothing happen.

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