[Bug 259970] sys.kern.coredump_phnum_test.coredump_phnum fails with ASLR on by default

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 28 Nov 2021 02:06:55 UTC

--- Comment #4 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:


commit ee2e925603e42897fbabe1b24208d27bdcaae786
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2021-11-21 17:17:20 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2021-11-28 00:27:03 +0000

    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)

 tests/sys/kern/coredump_phnum_helper.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

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