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From: "adhemerval.zanella at linaro dot org"
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To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/30186] RTLD_DEEPBIND interacts badly with
 LD_PRELOAD
Date: Wed, 22 Mar 2023 16:25:58 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30186

--- Comment #12 from Adhemerval Zanella <adhemerval.zanella at linaro dot o=
rg> ---
(In reply to Siddhesh Poyarekar from comment #10)
> We just removed hooks recently because they're a common exploit primitive,
> lets not go back in the direction of adding global function pointers agai=
n.

A weak reference generates a GOTPCREL relocation, and with relro should not=
 be
subject to same issues of malloc hook (it is either reallocated at loading,=
 or
kept null during process execution).

>=20
> The core issue here is the ordering of RTLD_DEEPBIND vs LD_PRELOAD and IMO
> the fact that LD_PRELOAD doesn't win is something that should be fixed.  I
> think it always should win but there may be reasons to have RTLD_DEEPBIND
> win that I'm unaware of.  Lets discuss fixing that ordering issue instead=
 on
> the libc-alpha mailing list.

--=20
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