From e30ab5fa4f99091482adf9c9904945c439c1e0aa Mon Sep 17 00:00:00 2001
From: Mark Johnston <markjdb@gmail.com>
Date: Thu, 28 May 2026 12:02:48 -0400
Subject: [PATCH] FreeBSD: Make it possible to build openzfs.ko with sanitizers

Add make options which let one respectively compile the kernel modules
with the address sanitizer, memory sanitizer, and undefined behaviour
sanitizer enabled.  This makes it much easier to run the ZTS with those
sanitizers enabled.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Chris Longros <chris.longros@gmail.com>
Signed-off-by: Mark Johnston <markj@FreeBSD.org>
Closes #18596
---
 module/Makefile.bsd | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/module/Makefile.bsd b/module/Makefile.bsd
index 96c3f3b2418..a0ddbeb9ae6 100644
--- a/module/Makefile.bsd
+++ b/module/Makefile.bsd
@@ -65,6 +65,12 @@ CFLAGS+= -DZFS_DEBUG -g
 CFLAGS += -DNDEBUG
 .endif
 
+.for _SAN in KASAN KMSAN KUBSAN
+.if defined(WITH_${_SAN}) && ${WITH_${_SAN}} == "true"
+KERN_OPTS_EXTRA+= ${_SAN}
+.endif
+.endfor
+
 .if defined(WITH_GCOV) && ${WITH_GCOV} == "true"
 CFLAGS+=	 -fprofile-arcs -ftest-coverage
 .endif