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From: "Simon.Richter at hogyros dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/25533] dlopen with RTLD_DEEPBIND crashes when using
 custom memory manager
Date: Mon, 05 Jul 2021 14:04:59 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25533

Simon Richter <Simon.Richter at hogyros dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Simon.Richter at hogyros d=
ot de

--- Comment #5 from Simon Richter <Simon.Richter at hogyros dot de> ---
I have the same issue with a program that uses libtbbmalloc (overriding
malloc/realloc/free) and calls dlopen("libudev.so.1", RTLD_DEEPBIND).

This creates a situation where libudev is linked against glibc only and doe=
sn't
see the overridden allocator, but the glibc instance it is linked to does h=
ave
these symbols overridden.

The crash happens when libudev calls strdup() from glibc, which allocates
memory from TBBmalloc, and later tries to pass the pointer to glibc's reall=
oc()
function.

As far as I can see, this cannot be worked around other than by inhibiting
RTLD_DEEPBIND (which is what I do in a preload library).

The proper fix here would be to create another instance of glibc for use by=
 the
hierarchy below the RTLD_DEEPBIND.

--=20
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