From: "H.J. Lu via Libc-alpha" <libc-alpha@sourceware.org>
To: Szabolcs Nagy <szabolcs.nagy@arm.com>
Cc: GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH v4 00/10] fix ifunc with static pie [BZ #27072]
Date: Tue, 19 Jan 2021 11:41:08 -0800 [thread overview]
Message-ID: <CAMe9rOoLubaLs5NeDNG=WjrX2Gpe+kr9rCb5o7xgZtvngX+R9g@mail.gmail.com> (raw)
In-Reply-To: <20210119182504.GG3445@arm.com>
On Tue, Jan 19, 2021 at 10:25 AM Szabolcs Nagy via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> The 01/18/2021 18:37, Adhemerval Zanella wrote:
> > As a side note I tried your branch with a build for all support Linux
> > ABIs and it as least improves by issuing an error on architectures
> > where previously indicated support static-pie but it is broken in practice
> > (powerpc for instance [1])
> >
> > So currently static-pie are support for all architectures, however it
> > fails to build for:
> >
> > alpha-linux-gnu
> > arc-linux-gnuhf
> > hppa-linux-gnu
> > ia64-linux-gnu
> > m68k-linux-gnu
> > microblaze-linux-gnu
> > riscv32-linux-gnu-rv32imafdc-ilp32d
> > riscv64-linux-gnu-rv64imafdc-lp64d
> > s390-linux-gnu
> > sparc64-linux-gnu
> > sparcv9-linux-gnu
> >
> > By requiring PI_STATIC_AND_HIDDEN hppa, m68, microblaze, mips, nios2,
> > and powerpc fail at configure. Some architecture still fails at build:
> >
> > alpha-linux-gnu
> > arc-linux-gnuhf
> > riscv32-linux-gnu-rv32imafdc-ilp32d
> > riscv64-linux-gnu-rv64imafdc-lp64d
> > s390-linux-gnu
> > sparc64-linux-gnu
> > sparcv9-linux-gnu
> >
> > I haven't checked if mips is currently broken for static-pie (since
> > as for powerpc, it does not define PI_STATIC_AND_HIDDEN); but I would
> > expect so.
> >
> > It would be good if we could avoid building the broken configuration
> > and warn it on configure, but I don't think this should be a blocker.
> > The NEWS for 2.27 states this features is only supported for x86
> > and aarch64, so I wonder if would be better to just enable it for
> > the supported architectures instead of relying on PI_STATIC_AND_HIDDEN.
>
> i randomly checked alpha, which fails while linking sln:
>
> elf/dl-reloc-static-pie.c:40: undefined reference to `_DYNAMIC'
>
> i think this should be possible to configure test in case others
> targets fail in a similar way.
>
Linker must be fixed to support static PIE:
https://sourceware.org/bugzilla/show_bug.cgi?id=22269
https://sourceware.org/bugzilla/show_bug.cgi?id=22263
https://sourceware.org/bugzilla/show_bug.cgi?id=21252
--
H.J.
next prev parent reply other threads:[~2021-01-19 19:41 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 16:22 [PATCH v4 00/10] fix ifunc with static pie [BZ #27072] Szabolcs Nagy via Libc-alpha
2021-01-18 16:23 ` [PATCH v4 01/10] configure: Require PI_STATIC_AND_HIDDEN for static pie Szabolcs Nagy via Libc-alpha
2021-01-18 16:23 ` [PATCH v4 02/10] libmvec: Add extra-test-objs to test-extras Szabolcs Nagy via Libc-alpha
2021-01-18 20:04 ` Adhemerval Zanella via Libc-alpha
2021-01-18 16:23 ` [PATCH v4 03/10] elf: Make the tunable struct definition internal only Szabolcs Nagy via Libc-alpha
2021-01-18 16:24 ` [PATCH v4 04/10] elf: Avoid RELATIVE relocs in __tunables_init Szabolcs Nagy via Libc-alpha
2021-01-18 16:24 ` [PATCH v4 05/10] Use hidden visibility for early static PIE code Szabolcs Nagy via Libc-alpha
2021-01-18 21:49 ` Adhemerval Zanella via Libc-alpha
2021-01-18 16:24 ` [PATCH v4 06/10] elf: Avoid RELATIVE relocation for _dl_sysinfo Szabolcs Nagy via Libc-alpha
2021-01-19 13:51 ` Adhemerval Zanella via Libc-alpha
2021-01-19 14:25 ` V2 " H.J. Lu via Libc-alpha
2021-01-19 14:35 ` Adhemerval Zanella via Libc-alpha
2021-01-18 16:25 ` [PATCH v4 07/10] Use <startup.h> in __libc_init_secure Szabolcs Nagy via Libc-alpha
2021-01-19 13:56 ` Adhemerval Zanella via Libc-alpha
2021-01-18 16:25 ` [PATCH v4 08/10] csu: Move static pie self relocation later [BZ #27072] Szabolcs Nagy via Libc-alpha
2021-01-19 14:07 ` Adhemerval Zanella via Libc-alpha
2021-01-19 14:35 ` Szabolcs Nagy via Libc-alpha
2021-01-19 14:36 ` Adhemerval Zanella via Libc-alpha
2021-01-19 14:48 ` H.J. Lu via Libc-alpha
2021-01-19 15:24 ` Szabolcs Nagy via Libc-alpha
2021-01-19 15:32 ` H.J. Lu via Libc-alpha
2021-01-19 16:47 ` H.J. Lu via Libc-alpha
2021-01-19 17:03 ` Szabolcs Nagy via Libc-alpha
2021-01-19 17:10 ` H.J. Lu via Libc-alpha
2021-01-19 17:25 ` Fāng-ruì Sòng via Libc-alpha
2021-01-19 17:33 ` H.J. Lu via Libc-alpha
2021-01-19 17:38 ` Fāng-ruì Sòng via Libc-alpha
2021-01-19 17:38 ` Szabolcs Nagy via Libc-alpha
2021-01-19 17:42 ` H.J. Lu via Libc-alpha
2021-01-19 17:47 ` Szabolcs Nagy via Libc-alpha
2021-01-19 17:53 ` H.J. Lu via Libc-alpha
2021-01-19 17:59 ` H.J. Lu via Libc-alpha
2021-01-18 16:25 ` [PATCH v4 09/10] x86: Check ifunc resolver with CPU_FEATURE_USABLE " Szabolcs Nagy via Libc-alpha
2021-01-19 14:11 ` Adhemerval Zanella via Libc-alpha
2021-01-19 14:37 ` V2 " H.J. Lu via Libc-alpha
2021-01-21 16:33 ` H.J. Lu via Libc-alpha
2021-01-18 16:26 ` [PATCH v4 10/10] Make libc symbols hidden in static PIE Szabolcs Nagy via Libc-alpha
2021-01-18 21:37 ` [PATCH v4 00/10] fix ifunc with static pie [BZ #27072] Adhemerval Zanella via Libc-alpha
2021-01-19 18:25 ` Szabolcs Nagy via Libc-alpha
2021-01-19 19:41 ` H.J. Lu via Libc-alpha [this message]
2021-01-19 20:16 ` Adhemerval Zanella via Libc-alpha
2021-01-19 21:38 ` H.J. Lu via Libc-alpha
2021-01-20 11:29 ` Adhemerval Zanella via Libc-alpha
2021-01-20 12:38 ` Szabolcs Nagy via Libc-alpha
2021-01-20 12:49 ` H.J. Lu via Libc-alpha
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