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List:       fedora-devel-list
Subject:    Re: Fedora 32 System-Wide Change proposal: Build Python 3 to statically link with libpython3.8.a for
From:       John Reiser <jreiser () bitwagon ! com>
Date:       2019-11-15 23:40:15
Message-ID: 7f1e8efc-4387-6b46-8f00-e6f602e372a1 () bitwagon ! com
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On 2019-11-15 at 14:51 UTC, David Malcolm wrote:

> Thinking aloud: does anyone ever use symbol overriding for anything
> other than glibc?

Yes.  It is particularly useful for "spear fishing" debugging of lower-level
interfaces in large, complex multi-process applications.  By some means
you determine that [part of] the bug involves a bad parameter to
a particular API, but a conditional breakpoint in gdb has too much overhead
(if you can figure out at all how to invoke gdb in the cloud of processes.)
So: LD_PRELOAD a .so which overrides the API and checks the parameter.
If no problem then pass control to the original implementation via RTLD_NEXT.
If bad, then raise an alarm, prepare a backtrace, pause or spin until
rescued by manual attach of gdb, etc.
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