PING: [PATCH] Add --enable-static-pie to build static PIE

[H.J. Lu]

On 9/28/17, Joseph Myers <joseph@codesourcery.com> wrote:
> On Wed, 27 Sep 2017, H.J. Lu wrote:
>
>> > static-PIE libraries) - although adding one or two additional
>> > static-PIE
>> > configurations to build-many-glibcs.py might be - but for testing
>> > purposes
>> > it's very useful to understand how widely this option works (or at
>> > least
>> > builds) for other architectures.
>>
>> Many architectures failed to build static PIE due to asm statements in
>> elf_machine_dynamic and elf_machine_load_address.   I didn't check
>> start.S which will fail at run-time if there are any dynamic relocations.
>
> In that case: (a) the install.texi / NEWS entries need to make clear the
> limited nature of architecture support for this feature; (b) if the
> feature achieves consensus to go in mainline at all,
> <https://sourceware.org/glibc/wiki/PortStatus> will need updating with a
> list of all the architectures lacking support and detailed information for
> architecture maintainers regarding how to make the feature work on their
> architectures and how to tell whether it is working.
>

I submitted patches for other targets to address obvious issues with static
PIE.  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-PICi 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.

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.

FAIL: glibcs-sparc64-linux-gnu build
FAIL: glibcs-sparcv9-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.

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.

Here is the updated patch to state that i686, x86-64 and x32 targets
are verified to work.  I encourage target maintainers to try hjl/pie/static
branch to verify if static PIE works for your targets.

Thanks.

-- 
H.J.
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