From: Youren Shen <shenyouren@gmail.com>
To: musl@lists.openwall.com
Subject: [BUG] Force to use a dynamic linker in musl-clang wapper cause a crash for static-pie c++ programs.
Date: Tue, 24 Dec 2019 22:38:49 +0800 [thread overview]
Message-ID: <CAHu4ykg6K9wBU8dF3gkjC1LCK3UrH9xQxuodD8VepA7P=Qf7Wg@mail.gmail.com> (raw)
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Hey, there,
Recently I'm trying to build a non-gnu toolchain with musl, clang, llvm,
libc++, compiler-rt. While static-pie feature is very useful in our
project, musl-clang force to link a dynamic linker into the binary. This
behavior will cause a crash in c++ programs with compiler-rt and libc++.
For more details and reproduction of this bug, you can read my previous
email to llvm-dev mail lists.[1]
I spend a few days to find the reason -- in function _dlstart_c, the
program will get a "base" of relocation in /lib/ld-musl-x86_64.so.1, which
is not right when it tries to relocate .rel.dyn section in the binary.
Overall, the static-pie program does not need a dynamic linker at all. So
maybe we should remove this argument in wrapper when static-pie is enabled.
Thank you very much.
[1]. https://groups.google.com/forum/#!msg/llvm-dev/XPrSPqD2zjM/YtH6Fi2YAgAJ
--
Best Regards.
Youren Shen.
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next reply other threads:[~2019-12-24 14:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-24 14:38 Youren Shen [this message]
2019-12-24 15:03 ` Rich Felker
2019-12-25 10:37 ` Youren Shen
2019-12-26 4:46 ` Fangrui Song
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