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5608fd23c2
1. 50+% of NO_PIE use is fixed by adding -fPIC to INTERNALLIB and other build-only utility libraries. 2. Another 40% is fixed by generating _pic.a variants of various libraries. 3. Some of the NO_PIE use is a bit absurd as it is disabling PIE (and ASLR) where it never would work anyhow, such as csu or loader. This suggests there may be better ways of adding support to the tree. Many of these cases can be fixed such that -fPIE will work but there is really no reason to have it in those cases. 4. Some of the uses are working around hacks done to some Makefiles that are really building libraries but have been using bsd.prog.mk because the code is cleaner. Had they been using bsd.lib.mk then NO_PIE would not have been needed. We likely do want to enable PIE by default (opt-out) for non-tree consumers (such as ports). For in-tree though we probably want to only enable PIE (opt-in) for common attack targets such as remote service daemons and setuid utilities. This is also a great performance compromise since ASLR is expected to reduce performance. As such it does not make sense to enable it in all utilities such as ls(1) that have little benefit to having it enabled. Reported by: kib
89 lines
2.8 KiB
Makefile
89 lines
2.8 KiB
Makefile
#-
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# Copyright (c) 2013-2014 Robert N. M. Watson
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# All rights reserved.
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#
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# This software was developed by SRI International and the University of
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# Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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# ("CTSRD"), as part of the DARPA CRASH research programme.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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BINDIR?= /boot
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INSTALLFLAGS= -b
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LOADERS= flashboot jtagboot
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FILES= ${LOADERS} ${LOADERS:S/$/.md5/}
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SRCS= relocate.S \
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start.S \
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boot2.c \
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altera_jtag_uart.c \
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cfi.c \
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sdcard.c
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MAN=
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AFLAGS= -G0
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CFLAGS= -ffreestanding \
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-I${.CURDIR} \
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-I${.CURDIR}/../../../common \
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-I${.CURDIR}/../../../.. \
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-D_KERNEL \
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-Wall \
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-G0 -Xassembler -G0 \
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-fno-pic -mno-abicalls \
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-msoft-float \
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-g
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# where to get libstand from
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CFLAGS+= -I${.CURDIR}/../../../../../lib/libstand/
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LIBSTAND= ${.OBJDIR}/../../../../../lib/libstand/libstand.a
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LDFLAGS= -nostdlib \
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-static \
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-N \
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-G0 \
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-L${.CURDIR}
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.PATH: ${.CURDIR}/../common
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CFLAGS+= -I${.CURDIR}/../common
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flashboot.elf: relocate.o start.o boot2.o altera_jtag_uart.o cfi.o sdcard.o
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${LD} ${_LDFLAGS} -T ${.CURDIR}/flashboot.ldscript -o ${.TARGET} \
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${.ALLSRC} ${LIBSTAND}
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flashboot: flashboot.elf
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objcopy -S -O binary ${.TARGET}.elf ${.TARGET}
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flashboot.md5: flashboot
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md5 flashboot > flashboot.md5
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jtagboot: start.o boot2.o altera_jtag_uart.o cfi.o sdcard.o
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${LD} ${_LDFLAGS} -T ${.CURDIR}/jtagboot.ldscript -o ${.TARGET} \
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${.ALLSRC} ${LIBSTAND}
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jtagboot.md5: jtagboot
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md5 jtagboot > jtagboot.md5
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CLEANFILES+= flashboot.elf
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.include <bsd.prog.mk>
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