This is the mail archive of the libc-help@sourceware.org mailing list for the glibc project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: LD_PRELOAD doesn't work with dynamic object built with `-static-pie`

From: Florian Weimer <fweimer at redhat dot com>
To: Baojun Wang <wangbj at gmail dot com>
Cc: libc-help at sourceware dot org
Date: Tue, 21 May 2019 08:02:09 +0200
Subject: Re: LD_PRELOAD doesn't work with dynamic object built with `-static-pie`
References: <CAC+a-TY6WfN-f0_sJhBR0+D7MbeYaruwg0UPWRO2RMDB+x7Kiw@mail.gmail.com>

* Baojun Wang:

> I tried to build a shared object with `-static-pie`, and then used it as
> `LD_PRELOAD`, but it didn't work, do you know why it failed?

This will not work for multiple reasons.  The static PIE object will not
have a dynamic symbol table, so no interposition takes place.  It also
uses relocations which are not supported in ELF shared objects.

glibc 2.30 will provide a clearer diagnostic for this, rejecting loading
the object outright.

Thanks,
Florian

References:
- LD_PRELOAD doesn't work with dynamic object built with `-static-pie`
  - From: Baojun Wang

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]