From dc227eb82ea8bf6919cd81a182a084589ddce7f3 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Tue, 29 Jun 2021 11:46:17 -0400 Subject: [PATCH] Add a build-time check that libpq doesn't call exit() or abort(). Directly exiting or aborting seems like poor form for a general-purpose library. Now that libpq liberally uses bits out of src/common/, it's very easy to accidentally include code that would do something unwanted like calling exit(1) after OOM --- see for example 8ec00dc5c. Hence, add a simple cross-check that no such calls have made it into libpq.so. The cross-check depends on nm(1) being available and being able to work on a shared library, which probably isn't true everywhere. But we can just make the test silently do nothing if nm fails. As long as the check is effective on common platforms, that should be good enough. (By the same logic, I've not worried about providing an equivalent test in MSVC builds.) Discussion: https://postgr.es/m/3128896.1624742969@sss.pgh.pa.us --- src/interfaces/libpq/Makefile | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile index 0c4e55b6ad..e8cd07e9c9 100644 --- a/src/interfaces/libpq/Makefile +++ b/src/interfaces/libpq/Makefile @@ -96,12 +96,19 @@ SHLIB_EXPORTS = exports.txt PKG_CONFIG_REQUIRES_PRIVATE = libssl libcrypto -all: all-lib +all: all-lib check-libpq-refs # Shared library stuff include $(top_srcdir)/src/Makefile.shlib backend_src = $(top_srcdir)/src/backend +# Check for functions that libpq must not call, currently abort() and exit(). +# If nm doesn't exist or doesn't work on shlibs, this test will silently +# do nothing, which is fine. The exclusion of _eprintf.o is to prevent +# complaining about infrastructure on ancient macOS releases. +.PHONY: check-libpq-refs +check-libpq-refs: $(shlib) + ! nm -A -g -u $< 2>/dev/null | grep -v '_eprintf\.o:' | grep -e abort -e exit # Make dependencies on pg_config_paths.h visible in all builds. fe-connect.o: fe-connect.c $(top_builddir)/src/port/pg_config_paths.h