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Date: Thu, 30 Jan 2020 00:35:52 +0300
From: Андрей Аладьев <aladjev.andrew@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Static linking is broken after creation of DT_TEXTREL segment
"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@...t70.net>:
> * Rich Felker <dalias@...c.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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