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Date: Mon, 2 Dec 2019 08:23:27 +0400
From: Jon Chesterfield <>
Subject:, Bsymbolic no longer necessary?


The early design notes for musl mention linking with Bsymbolic, which
seemed reasonable. I don't see that in the current Makefile, or the
equivalent protected visibility.

This seems to suggest that LD_PRELOAD can override calls to libc from
within libc. That seems dubious. Is there a use case for this? Or is it
avoided by the control flow in the loader itself?

I'm thinking of building the musl loader/libc elf with protected visibility
on the exported symbols and wondered whether I'm missing something.



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