K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2021-11-28T02:57:23.913784Z
K 7
svn:log
V 873
Fix coredump_phnum test with ASLR enabled

coredump_phnum intends to generate a core file with many PT_LOAD
segments.  Previously it called mmap() in a loop with alternating
protections, relying on each mapping following the previous, to produce
a core file with many page-sized PT_LOAD segments.  With ASLR on we no
longer have this property of each mmap() following the previous.

Instead, perform a single allocation, and then use mprotect() to set
alternating pages to PROT_READ.

PR:		259970
Reported by:	lwhsu, mw
Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D33070

(cherry picked from commit 8ec4c5dae32765701ac70811455084efd1570c32)
(cherry picked from commit ee2e925603e42897fbabe1b24208d27bdcaae786)

Git Hash:   d3a7b75bbcb5171d7eda9d712437efd46bb7605b
Git Author: emaste@FreeBSD.org
END