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  • Committer: Teddy Hogeborn
  • Date: 2019-07-14 22:39:15 UTC
  • Revision ID: teddy@recompile.se-20190714223915-aqjkms3t3taa6tye
Only use sanitizing options when debugging

The C compiler's sanitizing options introduce code in the output
binary which is fragile and not very security conscious.  It has
become clear that sanitizing is only really meant for use while
debugging.

As a side effect, this makes compilation faster, as the Makefile, for
production builds, no longer runs the compiler repeatedly to find all
its currently supported sanitizing options.

* Makefile (DEBUG): Add "$(SANITIZE)".
  (SANITIZE): Comment out.
  (CFLAGS): Remove "$(SANITIZE)".
  (plugins.d/mandos-client): Revert back to use plain $(LINK.c), since
                             we no longer need to remove the leak
                             sanitizer by overriding CFLAGS.

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Lines of Context:
Makefile
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        -Wmissing-format-attribute -Wnormalized=nfc -Wpacked \
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        -Wredundant-decls -Wnested-externs -Winline -Wvla \
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        -Wvolatile-register-var -Woverlength-strings
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#DEBUG:=-ggdb3 -fsanitize=address 
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# For info about _FORTIFY_SOURCE, see feature_test_macros(7)
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# and <https://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html>.
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FORTIFY:=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fPIC
 
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#DEBUG:=-ggdb3 -fsanitize=address $(SANITIZE)
 
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## Check which sanitizing options can be used
 
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#SANITIZE:=$(foreach option,$(ALL_SANITIZE_OPTIONS),$(shell \
 
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#       echo 'int main(){}' | $(CC) --language=c $(option) \
 
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#       /dev/stdin -o /dev/null >/dev/null 2>&1 && echo $(option)))
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# <https://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/>
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ALL_SANITIZE_OPTIONS:=-fsanitize=leak -fsanitize=undefined \
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        -fsanitize=shift -fsanitize=integer-divide-by-zero \
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        -fsanitize=float-cast-overflow -fsanitize=nonnull-attribute \
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        -fsanitize=returns-nonnull-attribute -fsanitize=bool \
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        -fsanitize=enum
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# Check which sanitizing options can be used
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SANITIZE:=$(foreach option,$(ALL_SANITIZE_OPTIONS),$(shell \
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        echo 'int main(){}' | $(CC) --language=c $(option) /dev/stdin \
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        -o /dev/null >/dev/null 2>&1 && echo $(option)))
 
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# For info about _FORTIFY_SOURCE, see feature_test_macros(7)
 
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# and <https://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html>.
 
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FORTIFY:=-D_FORTIFY_SOURCE=2 -fstack-protector-all -fPIC
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LINK_FORTIFY_LD:=-z relro -z now
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LINK_FORTIFY:=
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LIBNL3_LIBS:=$(shell pkg-config --libs libnl-route-3.0)
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# Do not change these two
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CFLAGS+=$(WARN) $(DEBUG) $(FORTIFY) $(SANITIZE) $(COVERAGE) \
 
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CFLAGS+=$(WARN) $(DEBUG) $(FORTIFY) $(COVERAGE) \
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        $(OPTIMIZE) $(LANGUAGE) -DVERSION='"$(version)"'
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LDFLAGS+=-Xlinker --as-needed $(COVERAGE) $(LINK_FORTIFY) $(foreach flag,$(LINK_FORTIFY_LD),-Xlinker $(flag))
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                --expression='s/\(mandos_\)[0-9.]\+\(\.orig\.tar\.gz\)/\1$(version)\2/' \
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                $@)
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# Need to add the GnuTLS, Avahi and GPGME libraries, and can't use
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# -fsanitize=leak because GnuTLS and GPGME both leak memory.
 
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# Need to add the GnuTLS, Avahi and GPGME libraries
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plugins.d/mandos-client: plugins.d/mandos-client.c
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        $(CC) $(filter-out -fsanitize=leak,$(CFLAGS)) $(strip\
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        ) $(GNUTLS_CFLAGS) $(AVAHI_CFLAGS) $(GPGME_CFLAGS) $(strip\
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                ) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH) $^ $(strip\
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                ) -lrt $(GNUTLS_LIBS) $(AVAHI_LIBS) $(strip\
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                ) $(GPGME_LIBS) $(LOADLIBES) $(LDLIBS) -o $@
 
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        $(LINK.c) $^ $(GNUTLS_CFLAGS) $(AVAHI_CFLAGS) $(strip\
 
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                ) $(GPGME_CFLAGS) -lrt $(GNUTLS_LIBS) $(strip\
 
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                ) $(AVAHI_LIBS) $(GPGME_LIBS) $(LOADLIBES) $(strip\
 
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                ) $(LDLIBS) -o $@
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plugin-helpers/mandos-client-iprouteadddel: plugin-helpers/mandos-client-iprouteadddel.c
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        $(LINK.c) $(LIBNL3_CFLAGS) $^ $(LIBNL3_LIBS) $(strip\