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From: "mail at milianw dot de" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug dynamic-link/28248] is there a way to LD_PRELOAD library before
 other dynamic libraries?
Date: Mon, 06 Sep 2021 08:19:46 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28248

--- Comment #2 from Milian Wolff <mail at milianw dot de> ---
I see, thank you!

Is there an alternative mechanism - potentially low-level / undocumented - =
that
I could leverage to somehow inject my interposing library in such a way, th=
at
it's initialization happens after libc, but before any other libraries?

I.e. instead of this:
```
        83:     calling init: /lib64/libc.so.6
        83:
        83:
        83:     calling init: /lib64/libdl.so.2
        83:
        83:
        83:     calling init: /lib64/libtinfo.so.5
        83:
        83:
        83:     calling init: /opt/craft/preload_dump.so
```

I would like to somehow achieve this:

```
        83:     calling init: /lib64/libc.so.6
        83:
        83:
        83:     calling init: /opt/craft/preload_dump.so
        83:
        83:
        83:     calling init: /lib64/libdl.so.2
        83:
        83:
        83:     calling init: /lib64/libtinfo.so.5
```

That way, I can call `__libc_freeres` safely, as no other library code run -
except that of libc itself.

Thanks

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