From: "Андрей Аладьев" <aladjev.andrew@gmail.com>
To: musl@lists.openwall.com
Subject: Re: [musl] Static linking is broken after creation of DT_TEXTREL segment
Date: Thu, 30 Jan 2020 00:35:52 +0300 [thread overview]
Message-ID: <CAMw0szKYTWd2vbBi7M1Zs7ik=Vi6tWxuNASxtsVwghdi=_zdXA@mail.gmail.com> (raw)
In-Reply-To: <20200129211024.GY23985@port70.net>
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"readelf -d main | grep TEXTREL" returns the same text on both musl and
glibc containers:
0x0000000000000016 (TEXTREL) 0x0
0x000000000000001e (FLAGS) TEXTREL
"gcc -no-pie" is another workaround for musl container like Rich said. But
I think that 'set(CMAKE_EXE_LINKER_FLAGS "-static")' will be best cross
platform solution. As I know "-static" implies "no-pie".
> i'm also surprised that it was only a warning, i think gcc default pie
toolchain passes -z text nowadays exactly to make this a link time failure.
this is probably a gentoo toolchain bug.
What do you mean "-z text"? We can report improvement for gentoo.
чт, 30 янв. 2020 г. в 00:10, Szabolcs Nagy <nsz@port70.net>:
> * Rich Felker <dalias@libc.org> [2020-01-29 15:53:30 -0500]:
> > On Wed, Jan 29, 2020 at 09:41:46PM +0300, Андрей Аладьев wrote:
> > > So I think that bug is inside musl itself. Glibc container is the same
> > > situation works fine. I see no way to create a workaround for this
> issue.
> >
> > musl only has limited support for TEXTRELs as a legacy feature, and
> > only on some archs. It does not support them in PIE executables or
> > other "new settings".
>
> i would like to see why this works on glibc.
>
> glibc can process some text relocs but even then
> the elf image will not be shared when multiple
> instances of the same binary are executed
> potentially wasting a lot of ram and icache.
>
> so i don't think the glibc behaviour is desirable.
>
> if the glibc binary does not have textrel (it can
> be checked using readelf -d binary) it would be
> nice to know why.
>
> i'm also surprised that it was only a warning,
> i think gcc default pie toolchain passes -z text
> nowadays exactly to make this a link time failure.
> this is probably a gentoo toolchain bug.
>
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next prev parent reply other threads:[~2020-01-29 21:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-29 18:41 Андрей Аладьев
2020-01-29 19:19 ` Markus Wichmann
2020-01-29 19:38 ` Markus Wichmann
2020-01-29 20:48 ` Rich Felker
2020-01-29 20:08 ` Андрей Аладьев
2020-01-30 17:02 ` Markus Wichmann
2020-01-31 4:24 ` Rich Felker
2020-01-31 14:47 ` Markus Wichmann
2020-01-31 16:35 ` Rich Felker
2020-01-31 15:16 ` Андрей Аладьев
2020-01-31 16:40 ` Rich Felker
2020-01-31 17:51 ` Андрей Аладьев
2020-01-31 18:01 ` Rich Felker
2020-01-31 19:11 ` Андрей Аладьев
2020-02-03 3:10 ` Rich Felker
2020-02-03 4:05 ` Rich Felker
2020-02-03 4:32 ` Markus Wichmann
2020-02-03 4:40 ` Rich Felker
2020-01-29 20:53 ` Rich Felker
2020-01-29 21:10 ` Szabolcs Nagy
2020-01-29 21:35 ` Андрей Аладьев [this message]
2020-01-29 21:46 ` Rich Felker
2020-01-29 23:10 ` Андрей Аладьев
2020-01-29 23:20 ` Szabolcs Nagy
2020-01-29 21:14 ` Андрей Аладьев
2020-01-29 21:43 ` Rich Felker
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