[src/trunk]: src/share/mk Add PAXCTL_FLAG rules for MKSANITIZER

[kamil <kamil%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3e1b55e10c6e
branches:  trunk
changeset: 964783:3e1b55e10c6e
user:      kamil <kamil%NetBSD.org@localhost>
date:      Sat Aug 17 00:14:48 2019 +0000

description:
Add PAXCTL_FLAG rules for MKSANITIZER

Add per-program rules to disable ASLR for ASan, TSan and MSan in all
sanitized programs. This flag is not needed for other supported sanitizers.

Without this change, sanitized init(8) dies early on startup.

Approach originally suggested by <joerg>

diffstat:

 share/mk/bsd.prog.mk |  10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diffs (28 lines):

diff -r 8b22976764d8 -r 3e1b55e10c6e share/mk/bsd.prog.mk
--- a/share/mk/bsd.prog.mk      Fri Aug 16 23:07:20 2019 +0000
+++ b/share/mk/bsd.prog.mk      Sat Aug 17 00:14:48 2019 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: bsd.prog.mk,v 1.321 2019/08/15 08:42:59 kamil Exp $
+#      $NetBSD: bsd.prog.mk,v 1.322 2019/08/17 00:14:48 kamil Exp $
 #      @(#)bsd.prog.mk 8.2 (Berkeley) 4/2/94
 
 .ifndef HOSTPROG
@@ -452,10 +452,18 @@
 _PROGDEBUG.${_P}:=     ${PROGNAME.${_P}}.debug
 .endif
 
+# paxctl specific arguments
+
 .if defined(PAXCTL_FLAGS)
 PAXCTL_FLAGS.${_P}?= ${PAXCTL_FLAGS}
 .endif
 
+.if ${MKSANITIZER:Uno} == "yes" && \
+       (${USE_SANITIZER} == "address" || ${USE_SANITIZER} == "thread" || \
+       ${USE_SANITIZER} == "memory")
+PAXCTL_FLAGS.${_P}= +a
+.endif
+
 ##### PROG specific flags.
 
 _DPADD.${_P}=          ${DPADD}    ${DPADD.${_P}}