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[Bug libc/19574] glibc should support building static PIE binaries
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 19 Oct 2017 19:09:20 +0000
- Subject: [Bug libc/19574] glibc should support building static PIE binaries
- Auto-submitted: auto-generated
- References: <bug-19574-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19574
--- Comment #13 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, hjl/pie/static has been created
at 5604b6622844968ea9a9f6f229eac852b3c21662 (commit)
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5604b6622844968ea9a9f6f229eac852b3c21662
commit 5604b6622844968ea9a9f6f229eac852b3c21662
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Sep 27 16:47:29 2017 -0700
Add --enable-static-pie to build-many-glibcs.py
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=936d3eb5e6c68e5c7a3513f503d62bfb739ee961
commit 936d3eb5e6c68e5c7a3513f503d62bfb739ee961
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 16:13:54 2017 -0700
sparc: Check PIC instead of SHARED in start.S
Since start.o may be compiled as PIC, we should check PIC instead of
SHARED.
* sysdeps/sparc/sparc32/start.S (_start): Check PIC instead of
SHARED.
* sysdeps/sparc/sparc64/start.S (_start): Likewise.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=455873e055731137522786330c9d3f07d77b0360
commit 455873e055731137522786330c9d3f07d77b0360
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 16:13:22 2017 -0700
microblaze: Check PIC instead of SHARED in start.S
Since start.o may be compiled as PIC, we should check PIC instead of
SHARED.
* sysdeps/microblaze/start.S (_start): Check PIC instead of SHARED.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=122fb81b591154163443332cb7a47bb1b255a8a1
commit 122fb81b591154163443332cb7a47bb1b255a8a1
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 16:12:52 2017 -0700
m68k: Check PIC instead of SHARED in start.S
Since start.o may be compiled as PIC, we should check PIC instead of
SHARED.
* sysdeps/m68k/start.S (_start): Check PIC instead of SHARED.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0f1b549c8286f352464640e7c50d8cb8a0f1608e
commit 0f1b549c8286f352464640e7c50d8cb8a0f1608e
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 16:12:28 2017 -0700
hppa: Check PIC instead of SHARED in start.S
Since start.o may be compiled as PIC, we should check PIC instead of
SHARED.
* sysdeps/hppa/start.S (_start): Check PIC instead of SHARED.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=617ffed24038aab4732e4ed2226940aadae9c796
commit 617ffed24038aab4732e4ed2226940aadae9c796
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 16:11:02 2017 -0700
aarch64: Check PIC instead of SHARED in start.S
Since start.o may be compiled as PIC, we should check PIC instead of
SHARED.
* sysdeps/aarch64/start.S (_start): Check PIC instead of SHARED.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4725827d1da9ea780a92b8f9b4b6032b4487d02c
commit 4725827d1da9ea780a92b8f9b4b6032b4487d02c
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 14:55:18 2017 -0700
sh: Update elf_machine_load_address for static PIE
When --enable-static-pie is used to configure glibc, we need to use
_dl_relocate_static_pie to compute load address in static PIE.
* sysdeps/sh/dl-machine.h (elf_machine_load_address): Use
_dl_relocate_static_pie instead of _dl_start to compute load
address in static PIE.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bf00010c165ab86e0f8f261a48651bb7c1a39dbf
commit bf00010c165ab86e0f8f261a48651bb7c1a39dbf
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 14:53:06 2017 -0700
s390: Update elf_machine_load_address for static PIE
When --enable-static-pie is used to configure glibc, we need to use
_dl_relocate_static_pie to compute load address in static PIE.
* sysdeps/s390/s390-32/dl-machine.h (elf_machine_dynamic): Use
_dl_relocate_static_pie instead of _dl_start to compute load
address in static PIE.
* sysdeps/s390/s390-64/dl-machine.h (elf_machine_dynamic):
Likewise.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=021b64f7d1789d95f271c02e02cd4ebf7f999344
commit 021b64f7d1789d95f271c02e02cd4ebf7f999344
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Sep 28 14:46:26 2017 -0700
m68k: Update elf_machine_load_address for static PIE
When --enable-static-pie is used to configure glibc, we need to use
_dl_relocate_static_pie to compute load address in static PIE.
* sysdeps/m68k/dl-machine.h (elf_machine_load_address): Use
_dl_relocate_static_pie instead of _dl_start to compute load
address in static PIE.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=767b6fecf193b2ba15acca235d03994c765999f5
commit 767b6fecf193b2ba15acca235d03994c765999f5
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Jul 17 08:17:32 2017 -0700
Add --enable-static-pie configure option to build static PIE [BZ #19574]
Dynamic linker, ld.so, is a standalone program which can be loaded at
any address. This patch adds a configure option, --enable-static-pie,
to embed the part of ld.so in static executable to create static position
independent executable (static PIE). A static PIE is similar to static
executable, but can be loaded at any address without help from a dynamic
linker. When --enable-static-pie is used to configure glibc, libc.a is
built as PIE and all static executables, including tests, are built as
static PIE. The resulting libc.a can be used together with GCC 8 or
above to build static PIE with the compiler option, -static-pie. But
GCC 8 isn't required to build glibc with --enable-static-pie. When an
older GCC is used to build glibc with --enable-static-pie, proper input
files are passed to linker to create static executables as static PIE,
together with "-z text" to prevent dynamic relocations in read-only
segments, which are allowed in static PIE.
crt1.o, which is used to create dynamic and non-PIE static executables,
is updated to include a dummy _dl_relocate_static_pie. Pcrt1.o is added
to create static PIE, which will link in the real _dl_relocate_static_pie.
gPcrt1.o is also added to create static PIE with -pg.
Static PIE can work on all architectures which support PIE, provided
1. Target must support accessing of local functions without dynamic
relocations, which is needed in start.S to call __libc_start_main with
function addresses of __libc_csu_init, __libc_csu_fini and main. All
functions in statice PIE are local functions. If PIE start.S can't
reach main () defined in a shared object, the code sequence:
pass addess of local_main to __libc_start_main
...
local_main:
tail call to main via PLT
can be used.
2. start.S is updated to check PIC instead SHARED for PIC code path and
avoid dynamic relocation, when PIC is defined and SHARED isn't defined,
to support static PIE. Patches are submitted for aarch64, hppa, m68k,
microblaze and sparc.
3. All assembly codes are updated check PIC instead SHARED for PIC code
path to avoid dynamic relocations in read-only sections.
4. All assembly codes are updated check SHARED instead PIC for static
symbol name. A patch is submitted for tile.
5. elf_machine_load_address in dl-machine.h are updated to support static
PIE. Patches are submitted for aarch64, m68k, s390 and sh.
NB: When glibc is built with GCC defaulted to PIE, libc.a is compiled
with -fPIE, regardless if --enable-static-pie is used to configure glibc.
When glibc is configured with --enable-static-pie, libc.a is compiled
with -fPIE, regardless wether GCC defaults to PIE or not. The same libc.a
can be used to build both static executable and static PIE. There is no
need for separate PIE copy of libc.a.
Linker requirements to build glibc with --enable-static-pie:
1. Linker supports --no-dynamic-linker to remove PT_INTERP segment from
static PIE.
2. Linker can create working static PIE. The x86-64 linker needs the
fix for
https://sourceware.org/bugzilla/show_bug.cgi?id=21782
The i386 linker needs to be able to convert "movl main@GOT(%ebx), %eax"
to "leal main@GOTOFF(%ebx), %eax" if main is defined locally.
Binutils 2.29 or above are OK for i686 and x86-64. But linker status for
other targets need to be verified.
3. Linker should resolve undefined weak symbols to 0 in static PIE:
https://sourceware.org/bugzilla/show_bug.cgi?id=22269
4. Many ELF backend linkers incorrectly check bfd_link_pic for TLS
relocations, which should check bfd_link_executable instead:
https://sourceware.org/bugzilla/show_bug.cgi?id=22263
Tested on i686 and x86-64.
Build results of build-many-glibcs.py with --enable-static-pie with all
patches for static PIE applied are
PASS: glibcs-aarch64_be-linux-gnu build
PASS: glibcs-aarch64-linux-gnu build
PASS: glibcs-armeb-linux-gnueabi build
PASS: glibcs-armeb-linux-gnueabi-be8 build
PASS: glibcs-armeb-linux-gnueabihf build
PASS: glibcs-armeb-linux-gnueabihf-be8 build
PASS: glibcs-arm-linux-gnueabi build
PASS: glibcs-arm-linux-gnueabihf build
PASS: glibcs-hppa-linux-gnu build
PASS: glibcs-i486-linux-gnu build
PASS: glibcs-i586-linux-gnu build
PASS: glibcs-i686-linux-gnu build
PASS: glibcs-i686-linux-gnu-disable-multi-arch build
PASS: glibcs-m68k-linux-gnu build
PASS: glibcs-microblazeel-linux-gnu build
PASS: glibcs-microblaze-linux-gnu build
PASS: glibcs-mips64el-linux-gnu-n64 build
PASS: glibcs-mips64el-linux-gnu-n64-nan2008 build
PASS: glibcs-mips64el-linux-gnu-n64-nan2008-soft build
PASS: glibcs-mips64el-linux-gnu-n64-soft build
PASS: glibcs-mips64-linux-gnu-n64 build
PASS: glibcs-mips64-linux-gnu-n64-nan2008 build
PASS: glibcs-mips64-linux-gnu-n64-nan2008-soft build
PASS: glibcs-mips64-linux-gnu-n64-soft build
PASS: glibcs-nios2-linux-gnu build
PASS: glibcs-powerpc64le-linux-gnu build
PASS: glibcs-powerpc64-linux-gnu build
PASS: glibcs-s390x-linux-gnu build
PASS: glibcs-x86_64-linux-gnu build
PASS: glibcs-x86_64-linux-gnu-disable-multi-arch build
PASS: glibcs-x86_64-linux-gnu-x32 build
FAIL: glibcs-alpha-linux-gnu build
elf/sln is failed to link due to:
assertion fail bfd/elf64-alpha.c:4125
This is caused by linker bug and/or non-PIC code in PIE libc.a.
FAIL: glibcs-ia64-linux-gnu build
elf/sln is failed to link due to:
libc.a(sched_yield.o): non-pic code with imm relocation against dynamic
symbol `_dl_sysinfo'
This is caused by non-PIC version of DO_CALL macro in ia64 sysdep.h. PIE
libc.a should use PIC version of DO_CALL, except during startup in static
PIE. An ia64 startup.h, similar to i386 startup.h, is needed to handle
this.
FAIL: glibcs-mips64el-linux-gnu-n32 build
FAIL: glibcs-mips64el-linux-gnu-n32-nan2008 build
FAIL: glibcs-mips64el-linux-gnu-n32-nan2008-soft build
FAIL: glibcs-mips64el-linux-gnu-n32-soft build
FAIL: glibcs-mips64-linux-gnu-n32 build
FAIL: glibcs-mips64-linux-gnu-n32-nan2008 build
FAIL: glibcs-mips64-linux-gnu-n32-nan2008-soft build
FAIL: glibcs-mips64-linux-gnu-n32-soft build
FAIL: glibcs-mipsel-linux-gnu build
FAIL: glibcs-mipsel-linux-gnu-nan2008 build
FAIL: glibcs-mipsel-linux-gnu-nan2008-soft build
FAIL: glibcs-mipsel-linux-gnu-soft build
FAIL: glibcs-mips-linux-gnu build
FAIL: glibcs-mips-linux-gnu-nan2008 build
FAIL: glibcs-mips-linux-gnu-nan2008-soft build
FAIL: glibcs-mips-linux-gnu-soft build
elf/sln is failed to link due to:
crt1.o: relocation R_MIPS_HI16 against `_gp' can not be used when making a
shared object; recompile with -fPIC
This is caused by linker bug and/or non-PIC code in crt1.o.
FAIL: glibcs-powerpc-linux-gnu build
FAIL: glibcs-powerpc-linux-gnu-soft build
FAIL: glibcs-powerpc-linux-gnuspe build
FAIL: glibcs-powerpc-linux-gnuspe-e500v1 build
elf/sln is failed to link due to:
ld: read-only segment has dynamic relocations.
This is caused by linker bug and/or non-PIC code in PIE libc.a. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=22264
FAIL: glibcs-powerpc-linux-gnu-power4 build
elf/sln is failed to link due to:
findlocale.c:96:(.text+0x22c): @local call to ifunc memchr
This is caused by linker bug and/or non-PIC code in PIE libc.a.
FAIL: glibcs-s390-linux-gnu build
elf/sln is failed to link due to:
collect2: fatal error: ld terminated with signal 11 [Segmentation fault],
core dumped
assertion fail bfd/elflink.c:14242
This is caused by linker bug and/or non-PIC code in PIE libc.a.
FAIL: glibcs-sh3eb-linux-gnu build
FAIL: glibcs-sh3-linux-gnu build
FAIL: glibcs-sh4eb-linux-gnu build
FAIL: glibcs-sh4eb-linux-gnu-soft build
FAIL: glibcs-sh4-linux-gnu build
FAIL: glibcs-sh4-linux-gnu-soft build
elf/sln is failed to link due to:
ld: read-only segment has dynamic relocations.
This is caused by linker bug and/or non-PIC code in PIE libc.a. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=22263
Also TLS code sequence in SH assembly syscalls in glibc doesn't match TLS
code sequence expected by ld:
https://sourceware.org/bugzilla/show_bug.cgi?id=22270
FAIL: glibcs-sparc64-linux-gnu build
FAIL: glibcs-sparcv9-linux-gnu build
FAIL: glibcs-tilegxbe-linux-gnu build
FAIL: glibcs-tilegxbe-linux-gnu-32 build
FAIL: glibcs-tilegx-linux-gnu build
FAIL: glibcs-tilegx-linux-gnu-32 build
FAIL: glibcs-tilepro-linux-gnu build
elf/sln is failed to link due to:
ld: read-only segment has dynamic relocations.
This is caused by linker bug and/or non-PIC code in PIE libc.a. See:
https://sourceware.org/bugzilla/show_bug.cgi?id=22263
[BZ #19574]
* INSTALL: Regenerated.
* Makeconfig (static-start-installed-name): Add the `P' prefix
for --enable-static-pie.
(pic-default): Updated for --enable-static-pie.
(pie-default): New for --enable-static-pie.
(default-pie-ldflag): Likewise.
(+link-static-before-libc): Use the first of $(DEFAULT-LDFLAGS-$(@F))
and $(default-pie-ldflag).
(+prectorT): Updated for --enable-static-pie.
(+postctorT): Likewise.
(CFLAGS-.o): Add $(pie-default).
(CFLAGS-.op): Likewise.
* NEWS: Mention --enable-static-pie.
* config.h.in (ENABLE_STATIC_PIE): New.
* configure.ac (--enable-static-pie): New configure option.
(have-no-dynamic-linker): New LIBC_CONFIG_VAR.
(have-static-pie): Likewise.
Enable static PIE if linker supports --no-dynamic-linker.
(ENABLE_STATIC_PIE): New AC_DEFINE.
(enable-static-pie): New LIBC_CONFIG_VAR.
* configure: Regenerated.
* csu/Makefile (omit-deps): Add P$(start-installed-name) for
--enable-static-pie.
(extra-objs): Likewise.
(install-lib): Likewise.
(extra-objs): Add static-reloc.o and static-reloc.os
($(objpfx)$(start-installed-name)): Also depend on
$(objpfx)static-reloc.o.
($(objpfx)P$(start-installed-name)): New.
($(objpfx)g$(start-installed-name)): Also depend on
$(objpfx)static-reloc.os.
* csu/libc-start.c (LIBC_START_MAIN): Call _dl_relocate_static_pie
in libc.a.
* csu/libc-tls.c (__libc_setup_tls): Add main_map->l_addr to
initimage.
* csu/static-reloc.c: New file.
* elf/Makefile (routines): Add dl-reloc-static-pie.
(elide-routines.os): Likewise.
* elf/dl-reloc-static-pie.c: New file.
* elf/dl-support.c (_dl_get_dl_main_map): New function.
* elf/dynamic-link.h (ELF_DURING_STARTUP): Also check
STATIC_PIE_BOOTSTRAP.
* elf/get-dynamic-info.h (elf_get_dynamic_info): Likewise.
* gmon/Makefile (tests): Add tst-gmon-static-pie.
(tests-static): Likewise.
(CFLAGS-tst-gmon-static-pie.c): New.
(CRT-tst-gmon-static-pie): Likewise.
(tst-gmon-static-pie-ENV): Likewise.
(tests-special): Likewise.
($(objpfx)tst-gmon-static-pie.out): Likewise.
(clean-tst-gmon-static-pie-data): Likewise.
($(objpfx)tst-gmon-static-pie-gprof.out): Likewise.
* gmon/tst-gmon-static-pie.c: New file.
* manual/install.texi: Document --enable-static-pie.
* sysdeps/generic/ldsodefs.h (_dl_relocate_static_pie): New.
* sysdeps/i386/configure.ac: Check if linker supports static PIE.
* sysdeps/x86_64/configure.ac: Likewise.
* sysdeps/i386/configure: Regenerated.
* sysdeps/x86_64/configure: Likewise.
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