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From: Jon Chesterfield <jonathanchesterfield@gmail.com>
To: musl@lists.openwall.com
Subject: libc.so, Bsymbolic no longer necessary?
Date: Mon, 2 Dec 2019 08:23:27 +0400	[thread overview]
Message-ID: <CAOUYtQBsRrqx5xJ+ipoFy_AkW+7t3DSZAijWV+w+0fVLWu8uQQ@mail.gmail.com> (raw)

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Hey,

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.

Thanks,

Jon

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             reply	other threads:[~2019-12-02  4:23 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02  4:23 Jon Chesterfield [this message]
2019-12-02  4:39 ` Fangrui Song
2019-12-02  4:44   ` Jon Chesterfield

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