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Add build system support for ASAN+UBSAN instrumentation

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This adds two new options WITH_ASAN/WITH_UBSAN that can be set to
enable instrumentation of all binaries with AddressSanitizer and/or
UndefinedBehaviourSanitizer. This current patch is almost sufficient
to get a complete buildworld with sanitizer instrumentation but in
order to actually build and boot a system it depends on a few more
follow-up commits.

Reviewed By:	brooks, kib, markj
Differential Revision: https://reviews.freebsd.org/D31043
This commit is contained in:
Alex Richardson 2021-08-02 09:48:21 +01:00
parent 5f6c8ce245
commit 7bc797e3f3
16 changed files with 92 additions and 6 deletions
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12
Makefile.inc1
View file

@ -718,6 +718,7 @@ BSARGS= DESTDIR= \
MK_HTML=no NO_LINT=yes MK_MAN=no MK_MAN_UTILS=yes \
-DNO_PIC MK_PROFILE=no -DNO_SHARED \
-DNO_CPU_CFLAGS MK_WERROR=no MK_CTF=no \
MK_ASAN=no MK_UBSAN=no \
MK_CLANG_EXTRAS=no MK_CLANG_FORMAT=no MK_CLANG_FULL=no \
MK_LLDB=no MK_RETPOLINE=no MK_TESTS=no \
MK_INCLUDES=yes
@ -739,6 +740,7 @@ TMAKE= \
SSP_CFLAGS= \
-DNO_LINT \
-DNO_CPU_CFLAGS MK_WERROR=no MK_CTF=no \
MK_ASAN=no MK_UBSAN=no \
MK_CLANG_EXTRAS=no MK_CLANG_FORMAT=no MK_CLANG_FULL=no \
MK_LLDB=no MK_RETPOLINE=no MK_TESTS=no
@ -2844,6 +2846,16 @@ _prereq_libs= lib/libcompiler_rt
.if ${MK_SSP} != "no"
_prereq_libs+= lib/libssp_nonshared
.endif
.if ${MK_ASAN} != "no"
_prereq_libs+= lib/libclang_rt/asan
_prereq_libs+= lib/libclang_rt/asan-preinit
_prereq_libs+= lib/libclang_rt/asan_cxx
.endif
.if ${MK_UBSAN} != "no"
_prereq_libs+= lib/libclang_rt/ubsan_minimal
_prereq_libs+= lib/libclang_rt/ubsan_standalone
_prereq_libs+= lib/libclang_rt/ubsan_standalone_cxx
.endif
# These dependencies are not automatically generated:
#

1
Makefile.libcompat
View file

@ -104,6 +104,7 @@ build${libcompat}: .PHONY
OBJROOT='$${OBJTOP}/' \
MAKEOBJDIRPREFIX= \
DIRPRFX=${_dir}/ -DNO_LINT -DNO_CPU_CFLAGS \
MK_ASAN=no MK_UBSAN=no \
MK_CTF=no MK_RETPOLINE=no MK_WERROR=no \
${_t}
.endfor

2
lib/Makefile
View file

@ -180,6 +180,8 @@ SUBDIR.${MK_STATS}+= libstats
${MACHINE_CPUARCH} == "arm" || ${MACHINE_CPUARCH} == "i386" || \
${MACHINE_CPUARCH} == "powerpc")
_libclang_rt= libclang_rt
.elif ${MK_ASAN} != "no" || ${MK_UBSAN} != "no"
.error "Requested build with sanitizers but cannot build runtime libraries!"
.endif
.if ${MK_CXX} != "no"

3
lib/csu/Makefile.inc
View file

@ -3,6 +3,9 @@
SSP_CFLAGS=
NO_WMISSING_VARIABLE_DECLARATIONS=
# Can't instrument these files since that breaks non-sanitized programs.
MK_ASAN:= no
MK_UBSAN:= no
.include <src.opts.mk>

2
lib/libclang_rt/Makefile.inc
View file

@ -12,6 +12,8 @@ SHLIBDIR= ${LIBDIR}
NO_PIC=
MK_PROFILE= no
MK_ASAN:= no
MK_UBSAN:= no
WARNS?= 0

8
lib/libgcc_eh/Makefile.inc
View file

@ -20,9 +20,17 @@ SRCS_EXC+= libunwind.cpp
SRCS+= ${SRCS_EXC}
.for file in ${SRCS_EXC:M*.c}
CFLAGS.${file}+= -fno-exceptions -funwind-tables
.if ${MK_ASAN} != "no"
# False-positives during stack unwinding
CFLAGS.${file}+= -fno-sanitize=address
.endif
.endfor
.for file in ${SRCS_EXC:M*.cpp}
CXXFLAGS.${file}+= -fno-exceptions -funwind-tables
.if ${MK_ASAN} != "no"
# False-positives during stack unwinding
CXXFLAGS.${file}+= -fno-sanitize=address
.endif
.endfor
CFLAGS+= -I${UNWINDINCDIR}

3
lib/libgcc_s/Makefile
View file

@ -4,6 +4,9 @@ PACKAGE= clibs
SHLIB_NAME= libgcc_s.so.1
SHLIBDIR?= /lib
# Enabling UBSan triggers "undefined reference to vtable for __cxxabiv1::__function_type_info"
MK_UBSAN:= no
.include <bsd.opts.mk>
MK_SSP= no

3
libexec/rtld-elf/Makefile
View file

@ -9,7 +9,10 @@ RTLD_ELF_DIR:= ${.PARSEDIR}
.include <src.opts.mk>
PACKAGE= clibs
MK_PIE= no # Always position independent using local rules
# Not compatible with sanitizer instrumentation or SSP.
MK_ASAN= no
MK_SSP= no
MK_UBSAN= no
CONFS= libmap.conf
PROG?= ld-elf.so.1

2
share/mk/bsd.README
View file

@ -118,7 +118,7 @@ The profiled libraries are no longer built in a different directory than
the regular libraries. A new suffix, ".po", is used to denote a profiled
object, and ".pico" denotes a position-independent relocatable object.
".nossppico" denotes a position-independent relocatable object without
stack smashing protection.
stack smashing protection and without sanitizer instrumentation.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

1
share/mk/bsd.compat.mk
View file

@ -162,6 +162,7 @@ LIBCOMPATCFLAGS+= -B${LIBCOMPATTMP}/usr/lib${libcompat}
LIBDIR_BASE:= /usr/lib${libcompat}
_LIB_OBJTOP= ${LIBCOMPAT_OBJTOP}
LIBDESTDIR:= ${LIBCOMPATTMP}
SYSROOT:= ${LIBCOMPATTMP}
CFLAGS+= ${LIBCOMPATCFLAGS}
LDFLAGS+= ${CFLAGS} ${LIBCOMPATLDFLAGS}
MACHINE= ${LIBCOMPAT_MACHINE}

8
share/mk/bsd.lib.mk
View file

@ -6,6 +6,8 @@
.include <bsd.compiler.mk>
.include <bsd.linker.mk>
__<bsd.lib.mk>__:
.if defined(LIB_CXX) || defined(SHLIB_CXX)
_LD= ${CXX}
.else
@ -106,6 +108,8 @@ CXXFLAGS+= -ftrivial-auto-var-init=pattern
.endif
.endif
.include "bsd.sanitizer.mk"
.if ${MK_DEBUG_FILES} != "no" && empty(DEBUG_FLAGS:M-g) && \
empty(DEBUG_FLAGS:M-gdwarf*)
CFLAGS+= ${DEBUG_FILES_CFLAGS}
@ -147,7 +151,7 @@ PO_FLAG=-pg
${CTFCONVERT_CMD}
.c.nossppico:
${CC} ${PICFLAG} -DPIC ${SHARED_CFLAGS:C/^-fstack-protector.*$//} ${CFLAGS:C/^-fstack-protector.*$//} -c ${.IMPSRC} -o ${.TARGET}
${CC} ${PICFLAG} -DPIC ${SHARED_CFLAGS:C/^-fstack-protector.*$//:C/^-fsanitize.*$//} ${CFLAGS:C/^-fstack-protector.*$//:C/^-fsanitize.*$//} -c ${.IMPSRC} -o ${.TARGET}
${CTFCONVERT_CMD}
.c.pieo:
@ -161,7 +165,7 @@ PO_FLAG=-pg
${CXX} ${PICFLAG} -DPIC ${SHARED_CXXFLAGS} ${CXXFLAGS} -c ${.IMPSRC} -o ${.TARGET}
.cc.nossppico .C.nossppico .cpp.nossppico .cxx.nossppico:
${CXX} ${PICFLAG} -DPIC ${SHARED_CXXFLAGS:C/^-fstack-protector.*$//} ${CXXFLAGS:C/^-fstack-protector.*$//} -c ${.IMPSRC} -o ${.TARGET}
${CXX} ${PICFLAG} -DPIC ${SHARED_CXXFLAGS:C/^-fstack-protector.*$//:C/^-fsanitize.*$//} ${CXXFLAGS:C/^-fstack-protector.*$//:C/^-fsanitize.*$//} -c ${.IMPSRC} -o ${.TARGET}
.cc.pieo .C.pieo .cpp.pieo .cxx.pieo:
${CXX} ${PIEFLAG} ${SHARED_CXXFLAGS} ${CXXFLAGS} -c ${.IMPSRC} -o ${.TARGET}

4
share/mk/bsd.opts.mk
View file

@ -69,6 +69,7 @@ __DEFAULT_YES_OPTIONS = \
WERROR
__DEFAULT_NO_OPTIONS = \
ASAN \
BIND_NOW \
CCACHE_BUILD \
CTF \
@ -77,7 +78,8 @@ __DEFAULT_NO_OPTIONS = \
INSTALL_AS_USER \
MANSPLITPKG \
RETPOLINE \
STALE_STAGED
STALE_STAGED \
UBSAN
__DEFAULT_DEPENDENT_OPTIONS = \
MAKE_CHECK_USE_SANDBOX/TESTS \

2
share/mk/bsd.prog.mk
View file

@ -81,6 +81,8 @@ CXXFLAGS+= -ftrivial-auto-var-init=pattern
.endif
.endif
.include "bsd.sanitizer.mk"
.if ${MACHINE_CPUARCH} == "riscv" && ${LINKER_FEATURES:Mriscv-relaxations} == ""
CFLAGS += -mno-relax
.endif

2
share/mk/bsd.progs.mk
View file

@ -23,7 +23,7 @@ PROGS += ${PROGS_CXX}
.if defined(PROG)
# just one of many
PROG_OVERRIDE_VARS += BINDIR BINGRP BINOWN BINMODE CSTD CXXSTD DPSRCS MAN \
NO_SHARED MK_WERROR PROGNAME SRCS STRIP WARNS
NO_SHARED MK_WERROR PROGNAME SRCS STRIP WARNS MK_ASAN MK_UBSAN
PROG_VARS += CFLAGS CXXFLAGS DEBUG_FLAGS DPADD INTERNALPROG LDADD LIBADD \
LINKS LDFLAGS MLINKS ${PROG_OVERRIDE_VARS}
.for v in ${PROG_VARS:O:u}

43
share/mk/bsd.sanitizer.mk Normal file
View file

@ -0,0 +1,43 @@
.include <bsd.opts.mk>
.include "../../lib/libclang_rt/compiler-rt-vars.mk"
_use_sanitizers= no
# Add the necessary sanitizer flags if requested
.if ${MK_ASAN} == "yes" && ${NO_SHARED:Uno:tl} == "no"
SANITIZER_CFLAGS+= -fsanitize=address -fPIC
# TODO: remove this once all basic errors have been fixed:
# https://github.com/google/sanitizers/wiki/AddressSanitizer#faq
SANITIZER_CFLAGS+= -fsanitize-recover=address
SANITIZER_LDFLAGS+= -fsanitize=address
_use_sanitizers= yes
.endif # ${MK_ASAN} == "yes"
.if ${MK_UBSAN} == "yes" && ${NO_SHARED:Uno:tl} == "no"
# Unlike the other sanitizers, UBSan could also work for static libraries.
# However, this currently results in linker errors (even with the
# -fsanitize-minimal-runtime flag), so only enable it for dynamically linked
# code for now.
SANITIZER_CFLAGS+= -fsanitize=undefined
SANITIZER_CFLAGS+= -fsanitize-recover=undefined
SANITIZER_LDFLAGS+= -fsanitize=undefined
_use_sanitizers= yes
.endif # ${MK_UBSAN} == "yes"
.if !defined(BOOTSTRAPPING) && ${_use_sanitizers} != 0 && \
${COMPILER_TYPE} != "clang"
.error "Sanitizer instrumentation currently only supported with clang"
.endif
# For libraries we only instrument the shared and PIE libraries by setting
# SHARED_CFLAGS instead of CFLAGS. We do this since static executables are not
# compatible with the santizers (interceptors do not work).
.if ${_use_sanitizers} != "no"
.if target(__<bsd.lib.mk>__)
SHARED_CFLAGS+= ${SANITIZER_CFLAGS}
SOLINKOPTS+= ${SANITIZER_LDFLAGS}
LDFLAGS:= ${LDFLAGS:N-Wl,-no-undefined:N-Wl,--no-undefined}
.else
CFLAGS+= ${SANITIZER_CFLAGS}
LDFLAGS+= ${SANITIZER_LDFLAGS}
.endif
.endif # ${_use_sanitizers} != "no"

2
share/mk/sys.mk
View file

@ -242,7 +242,7 @@ LFLAGS ?=
# compiler driver flags (e.g. -mabi=*) that conflict with flags to LD.
LD ?= ld
LDFLAGS ?=
_LDFLAGS = ${LDFLAGS:S/-Wl,//g:N-mabi=*:N-fuse-ld=*:N--ld-path=*}
_LDFLAGS = ${LDFLAGS:S/-Wl,//g:N-mabi=*:N-fuse-ld=*:N--ld-path=*:N-fsanitize=*:N-fno-sanitize=*}
MAKE ?= make