From: "H.J. Lu" <hjl.tools@gmail.com>
To: Alan Modra <amodra@gmail.com>
Cc: Binutils <binutils@sourceware.org>
Subject: Re: V6 [PATCH] x86: Only allow S - A relocations against absolute symbol
Date: Thu, 2 Apr 2020 04:54:29 -0700 [thread overview]
Message-ID: <CAMe9rOqr8+mUw3ga-AnV=p3hWBPW-E2JfJ4Ko=s5yiXPXu+v4A@mail.gmail.com> (raw)
In-Reply-To: <20200402032454.GD4583@bubble.grove.modra.org>
On Wed, Apr 1, 2020 at 8:25 PM Alan Modra <amodra@gmail.com> wrote:
>
> Seen here on Ubuntu 18.04 when using a number of different gcc
> versions.
>
> FAIL: Run pr25749-1bb (-no-pie -fno-PIE)
> FAIL: Run pr25749-1bb (-pie -fPIE)
> FAIL: Run pr25749-2ab (-no-pie -fno-PIE)
> FAIL: Run pr25749-2ab (-pie -fPIE)
Ubuntu 18.04 has glibc 2.27 which doesn't have
commit e7feec374c635b6a29d65c39ae5e1855528fed39
Author: Maciej W. Rozycki <macro@mips.com>
Date: Wed Apr 4 23:09:37 2018 +0100
elf: Correct absolute (SHN_ABS) symbol run-time calculation [BZ #19818]
Do not relocate absolute symbols by the base address. Such symbols have
SHN_ABS as the section index and their value is not supposed to be
affected by relocation as per the ELF gABI[1]:
"SHN_ABS
The symbol has an absolute value that will not change because of
relocation."
Glibc 2.28 and above are OK.
--
H.J.
next prev parent reply other threads:[~2020-04-02 11:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-31 4:43 H.J. Lu
2020-03-31 6:17 ` Fangrui Song
2020-03-31 14:31 ` H.J. Lu
2020-03-31 23:25 ` V3 " H.J. Lu
2020-04-01 3:30 ` V4 " H.J. Lu
2020-04-01 14:06 ` V5 " H.J. Lu
2020-04-01 21:28 ` V6 " H.J. Lu
2020-04-02 3:24 ` Alan Modra
2020-04-02 11:54 ` H.J. Lu [this message]
2020-04-02 14:10 ` H.J. Lu
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