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| H A D | vm_map.c | diff 19f49ad30f5ef296867e3675378e2ca010adfa1d Sun Jun 25 22:06:05 CEST 2017 Konstantin Belousov <kib@FreeBSD.org> Correctly handle small MAP_STACK requests.
If mmap(2) is called with the MAP_STACK flag and the size which is
less or equal to the initial stack mapping size plus guard,
calculation of the mapping layout created zero-sized guard. Attempt
to create such entry failed in vm_map_insert(), causing the whole
mmap(2) call to fail.
Fix it by adjusting the initial mapping size to have space for
non-empty guard. Reject MAP_STACK requests which are shorter or equal
to the configured guard pages size.
Reported and tested by: Manfred Antar <null@pozo.com>
Reviewed by: alc, markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
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