From: Alexander Scherbatiy <alexander.scherbatiy@bell-sw.com>
To: Rich Felker <dalias@libc.org>
Cc: musl@lists.openwall.com, Markus Wichmann <nullplan@gmx.net>
Subject: Re: [musl] Shared library loading
Date: Mon, 25 May 2020 20:26:51 +0300 [thread overview]
Message-ID: <96367f9c-4b02-c512-9d46-96de9e39a059@bell-sw.com> (raw)
In-Reply-To: <20200522182555.GA1079@brightrain.aerifal.cx>
On 22.05.2020 21:25, Rich Felker wrote:
> The concept here is that non-pathname library names should be loaded
> from the library path and not replaced by something (typically a
> "module" or "plug-in") in a different, explicitly-loaded location that
> happens to have a colliding base filename.
>
> For example suppose your application loads modules from $libdir/myapp/
> and has a module named "libfoo.so". Unbeknownst to you, there's also a
> "libfoo.so" in the system paths, and some library you potentially load
> indirectly (maybe the GPU driver for some video hardware you've never
> heard of) depends on "libfoo.so".
>
> If dlopen("$libdir/myapp/libfoo.so") had put "libfoo.so" in the
> namespace such that it would satisfy future load requests for the name
> "libfoo.so", the subsequent load would break due to getting the wrong
> (unrelated) library.
Is it correct that RTLD_GLOBAL flag is in some kind of obsolete in
musl because calling
dlopen("$libdir/myapp/libfoo.so", RTLD_NOW | RTLD_GLOBAL);
dlopen("$libdir2/myapp2/libbar.so", RTLD_LAZY);
does not allow libbar.so to find library $libdir/myapp/libfoo.so
which it is depend on?
What is the suggested way in musl to load $libdir/myapp/libfoo.so
from a custom directory so libbar.so can find it?
Thanks,
Alexander.
> Rich
next prev parent reply other threads:[~2020-05-25 17:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 11:27 Alexander Scherbatiy
2020-05-21 15:21 ` Markus Wichmann
2020-05-22 18:07 ` Alexander Scherbatiy
2020-05-22 18:25 ` Rich Felker
2020-05-23 14:12 ` Florian Weimer
2020-05-23 16:05 ` Rich Felker
2020-05-25 17:26 ` Alexander Scherbatiy [this message]
2020-05-25 17:46 ` Rich Felker
2020-05-27 18:10 ` Dmitry Samersoff
2020-05-28 18:53 ` Szabolcs Nagy
2020-05-28 19:20 ` Jeffrey Walton
2020-05-28 19:29 ` Rich Felker
2020-06-04 19:37 ` Alexander Scherbatiy
2020-06-04 19:48 ` Rich Felker
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=96367f9c-4b02-c512-9d46-96de9e39a059@bell-sw.com \
--to=alexander.scherbatiy@bell-sw.com \
--cc=dalias@libc.org \
--cc=musl@lists.openwall.com \
--cc=nullplan@gmx.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).