freebsd-skq/lib/libssp/Makefile

# $FreeBSD$

PACKAGE=	clibs
SHLIBDIR?=	/lib
SHLIB=		ssp
SHLIB_MAJOR=	0

VERSION_DEF=	${.CURDIR}/Versions.def
SYMBOL_MAPS=	${.CURDIR}/Symbol.map

.PATH: ${SRCTOP}/lib/libc/secure
CFLAGS+=	-I${SRCTOP}/lib/libc/include
# _elf_aux_info is exported from libc as elf_aux_info(3), so just that for the
# libssp build instead.
CFLAGS+=	-D_elf_aux_info=elf_aux_info
SRCS=		stack_protector.c fortify_stubs.c

CFLAGS.fortify_stubs.c=	-Wno-unused-parameter

# Stack protection on libssp symbols should be considered harmful, as we may
# be talking about, for example, the guard setup constructor.
SSP_CFLAGS:=

.include <bsd.lib.mk>
Provide libssp based on libc For libssp.so, rebuild stack_protector.c with FORTIFY_SOURCE stubs that just abort built into it. For libssp_nonshared.a, steal stack_protector_compat.c from ^/lib/libc/secure and massage it to maintain that __stack_chk_fail_local is a hidden symbol. libssp is now built unconditionally regardless of {WITH,WITHOUT}_SSP in the build environment, and the gcclibs version has been disconnected from the build in favor of this one. PR: 242950 (exp-run) Reviewed by: kib, emaste, pfg, Oliver Pinter (earlier version) Also discussed with: kan MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D22943 2020-01-04 20:19:25 +00:00			`# $FreeBSD$`

			`PACKAGE= clibs`
			`SHLIBDIR?= /lib`
			`SHLIB= ssp`
			`SHLIB_MAJOR= 0`

			`VERSION_DEF= ${.CURDIR}/Versions.def`
			`SYMBOL_MAPS= ${.CURDIR}/Symbol.map`

			`.PATH: ${SRCTOP}/lib/libc/secure`
			`CFLAGS+= -I${SRCTOP}/lib/libc/include`
			`# _elf_aux_info is exported from libc as elf_aux_info(3), so just that for the`
			`# libssp build instead.`
			`CFLAGS+= -D_elf_aux_info=elf_aux_info`
			`SRCS= stack_protector.c fortify_stubs.c`

			`CFLAGS.fortify_stubs.c= -Wno-unused-parameter`

libssp: don't compile with -fstack-protector* This similarly matches what we do in libc; compiling libssp with -fstack-protector* is actively harmful. For instance, if the canary ctor ends up with a stack protector then it will trivially trigger a false positive as the canary's being initialized. This was noted by the reporter as irc/ircd-hybrid started crashing at start after our libssp was MFC'd to stable/11, as its build will explicitly link in libssp. On FreeBSD, this isn't necessary as SSP bits are included in libc, but it should absolutely not trigger runtime breakage -- it does mean that the canary will get initialized twice, but as this is happening early on in application startup it should just be redundant work. Reported by: Tod McQuillin <devin@sevenlayer.studio> MFC after: 3 days 2020-03-14 15:15:27 +00:00			`# Stack protection on libssp symbols should be considered harmful, as we may`
			`# be talking about, for example, the guard setup constructor.`
			`SSP_CFLAGS:=`

Provide libssp based on libc For libssp.so, rebuild stack_protector.c with FORTIFY_SOURCE stubs that just abort built into it. For libssp_nonshared.a, steal stack_protector_compat.c from ^/lib/libc/secure and massage it to maintain that __stack_chk_fail_local is a hidden symbol. libssp is now built unconditionally regardless of {WITH,WITHOUT}_SSP in the build environment, and the gcclibs version has been disconnected from the build in favor of this one. PR: 242950 (exp-run) Reviewed by: kib, emaste, pfg, Oliver Pinter (earlier version) Also discussed with: kan MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D22943 2020-01-04 20:19:25 +00:00			`.include <bsd.lib.mk>`