dtrace: Add WITH_DTRACE_ASAN

See commit 4ae6991228.  This version of
the commit avoids inadvertently changing SHLIBDIR for libdtrace.so.

cddl/lib/libdtrace/Makefile

@@ -1,10 +1,15 @@
 # $FreeBSD$
 
+SHLIBDIR?=	/lib
+
+.include <src.opts.mk>
+
 .PATH: ${SRCTOP}/cddl/contrib/opensolaris/lib/libdtrace/common
 .PATH: ${SRCTOP}/cddl/contrib/opensolaris/lib/libgen/common
 
 PACKAGE=	dtrace
 LIB=		dtrace
+
 SRCS=		dt_aggregate.c \
 		dt_as.c \
 		dt_buf.c \
@@ -138,6 +143,11 @@ DSRCS+=		regs_aarch64.d
 
 YFLAGS+=-d
 
+.if ${MK_DTRACE_ASAN} != "no"
+CFLAGS+=	-fsanitize=address -fsanitize=undefined
+LDFLAGS+=	-fsanitize=address -fsanitize=undefined
+.endif
+
 LIBADD=	ctf elf proc pthread rtld_db
 
 CLEANFILES=	dt_errtags.c dt_names.c

cddl/usr.sbin/dtrace/Makefile

@@ -30,6 +30,11 @@ CFLAGS+= -DHAVE_ISSETUGID
 #CFLAGS+=	-DNEED_ERRLOC
 #YFLAGS+=	-d
 
+.if ${MK_DTRACE_ASAN} != "no"
+CFLAGS+=	-fsanitize=address -fsanitize=undefined
+LDFLAGS+=	-fsanitize=address -fsanitize=undefined
+.endif
+
 LIBADD=	dtrace ctf elf proc spl
 
 .if ${MK_DTRACE_TESTS} != "no"

cddl/usr.sbin/lockstat/Makefile

@@ -1,5 +1,7 @@
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 .PATH: ${SRCTOP}/cddl/contrib/opensolaris/cmd/lockstat
 
 PACKAGE=	dtrace
@@ -26,6 +28,11 @@ CFLAGS+=	-I${SRCTOP}/sys/cddl/compat/opensolaris \
 		-I${SRCTOP}/sys
 CFLAGS+= -DHAVE_ISSETUGID
 
+.if ${MK_DTRACE_ASAN} != "no"
+CFLAGS+=	-fsanitize=address -fsanitize=undefined
+LDFLAGS+=	-fsanitize=address -fsanitize=undefined
+.endif
+
 CFLAGS+=	-DNEED_ERRLOC -g
 
 #YFLAGS+=	-d

cddl/usr.sbin/plockstat/Makefile

@@ -1,5 +1,7 @@
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 .PATH: ${SRCTOP}/cddl/contrib/opensolaris/cmd/plockstat
 
 PACKAGE=	dtrace
@@ -26,6 +28,11 @@ CFLAGS+=	-I${SRCTOP}/sys/cddl/compat/opensolaris \
 		-I${SRCTOP}/sys
 CFLAGS+= -DHAVE_ISSETUGID
 
+.if ${MK_DTRACE_ASAN} != "no"
+CFLAGS+=	-fsanitize=address -fsanitize=undefined
+LDFLAGS+=	-fsanitize=address -fsanitize=undefined
+.endif
+
 LIBADD=	dtrace proc
 
 .include <bsd.prog.mk>

share/man/man5/src.conf.5

@@ -594,6 +594,11 @@ When set, it enforces these options:
 .It
 .Va WITHOUT_CTF
 .El
+.It Va WITH_DTRACE_ASAN
+Compile userspace DTrace code (libdtrace, dtrace(1), lockstat(1), plockstat(1))
+with address and undefined behavior sanitizers.
+Requires that Clang be used as the base system compiler
+and that the runtime support library is available.
 .It Va WITH_DTRACE_TESTS
 Build and install the DTrace test suite in
 .Pa /usr/tests/cddl/usr.sbin/dtrace .

share/mk/src.opts.mk

@@ -200,6 +200,7 @@ __DEFAULT_NO_OPTIONS = \
     CLANG_FORMAT \
     DETECT_TZ_CHANGES \
     DISK_IMAGE_TOOLS_BOOTSTRAP \
+    DTRACE_ASAN \
     DTRACE_TESTS \
     EXPERIMENTAL \
     HESIOD \

tools/build/options/WITH_DTRACE_ASAN

@@ -0,0 +1,4 @@
+Compile userspace DTrace code (libdtrace, dtrace(1), lockstat(1), plockstat(1))
+with address and undefined behavior sanitizers.
+Requires that Clang be used as the base system compiler
+and that the runtime support library is available.