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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 02:10:24 +0300	[thread overview]
Message-ID: <CAMw0szL+m=t0ztBcCXZwquR7gkFUB4_SzKEpOy62yxzc-xXYmw@mail.gmail.com> (raw)
In-Reply-To: <20200129214641.GN30412@brightrain.aerifal.cx>

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I've tested and both "-fno-pie" and "-static" are not compatible with some
gcc and clang sanitizers, so these solutions are bad.

Found right solution in gmp source. It was hidden in configure:
"--with-pic" option. I've enabled it and now both glibc and musl works
perfect. Created gentoo bug https://bugs.gentoo.org/707332. For everyone
who will read this thread - you need to enable "--with-pic" option for gmp.
You don't need to disable assembly completely.

So on this week I will try to create small user friendly patch for musl
about readonly relocations.

чт, 30 янв. 2020 г. в 00:46, Rich Felker <dalias@libc.org>:

> On Thu, Jan 30, 2020 at 12:35:52AM +0300, Андрей Аладьев wrote:
> > "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".
>
> -static normally does not imply -no-pie with musl target. musl was the
> first to introduce static pie, and it was not treated as something
> special/weird you have to request, just what you get with -static +
> -pie or -static and default-pie toolchain.
>
> When GCC upstreamed static pie with glibc support, they made it so
> -static overrides -pie and so you need the new -static-pie to get
> static pie. musl patches for gcc revert this change since it's a
> regression to the original behavior, treats static-pie a second-class,
> and does not work with environments where pie is mandatory (like nommu
> targets) where default-pie *must* be honored.
>
> Rich
>

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  reply	other threads:[~2020-01-29 23:10 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
2020-01-29 21:46       ` Rich Felker
2020-01-29 23:10         ` Андрей Аладьев [this message]
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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