journald: do not store the iovec entry for process commandline on stack

journald: do not store the iovec entry for process commandline on stack

This fixes a crash where we would read the commandline, whose length is under
control of the sending program, and then crash when trying to create a stack
allocation for it.

CVE-2018-16864
https://bugzilla.redhat.com/show_bug.cgi?id=1653855

The message actually doesn't get written to disk, because
journal_file_append_entry() returns -E2BIG.

(cherry picked from commit 084eeb865ca63887098e0945fb4e93c852b91b0f)
(cherry picked from commit cf56627fe5525132c8e09eb3e77bfc0556a2f04d)

Gbp-Pq: Name journald-do-not-store-the-iovec-entry-for-process-command.patch