From 5db5c6c87a75f8b1871f021726fc4697253ae5cf Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 29 Feb 2024 01:40:41 +0200
Subject: [PATCH] rtld: use generated map file to check for some leaks from
 libc into rtld

Reviewed by:	brooks, emaste (previous version)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D44136
---
 libexec/rtld-elf/Makefile | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/libexec/rtld-elf/Makefile b/libexec/rtld-elf/Makefile
index cc40b839024..37c3840538d 100644
--- a/libexec/rtld-elf/Makefile
+++ b/libexec/rtld-elf/Makefile
@@ -79,6 +79,25 @@ MAPFILE=	ld-elf.so.1.map
 LDFLAGS+=	-Wl,-Map=${MAPFILE} -Wl,--cref
 CLEANFILES+=	${MAPFILE}
 
+afterbuild:
+	@if grep __libsys_interposing ${MAPFILE} >/dev/null ; then \
+		echo "libsys_interposing leaked" 1>&2 ; \
+		exit 1 ; \
+	fi
+	@if grep __libc_interposing ${MAPFILE} >/dev/null ; then \
+		echo "libc_interposing leaked" 1>&2 ; \
+		exit 1 ; \
+	fi
+	@if grep xlocale ${MAPFILE} >/dev/null ; then \
+		echo "xlocale leaked" 1>&2 ; \
+		exit 1 ; \
+	fi
+	@if grep fprintf ${MAPFILE} >/dev/null ; then \
+		echo "stdio leaked" 1>&2 ; \
+		exit 1 ; \
+	fi
+
+
 # Since moving rtld-elf to /libexec, we need to create a symlink.
 # Fixup the existing binary that's there so we can symlink over it.
 beforeinstall: