public inbox for glibc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/30613] New: Unexpanded $ORIGIN paths are stored on libname list if dlopen called with DST
Date: Tue, 04 Jul 2023 08:32:44 +0000	[thread overview]
Message-ID: <bug-30613-131@http.sourceware.org/bugzilla/> (raw)

https://sourceware.org/bugzilla/show_bug.cgi?id=30613

            Bug ID: 30613
           Summary: Unexpanded $ORIGIN paths are stored on libname list if
                    dlopen called with DST
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

This seems to happen if $ORIGIN substitutions are used in dlopen. This is
either a harmless waste of memory (because the unexpanded paths are never used
for lookup), or a correctness issue (because the $ORIGIN paths depend on the
caller of dlopen).

Here's a dump of the libname aliases from the elf/tst-global1 test case:

namespace 0
  '' 0x7ffff7ffe2d0
      origin 0x7ffff7ffe8a0 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias ''
  'linux-vdso.so.1' 0x7ffff7ffe930
      alias 'linux-vdso.so.1'
  './libc.so.6' 0x7ffff7fbc480
      origin 0x7ffff7fbc950 "/home/fweimer/src/gnu/glibc/build-master/."
      alias 'libc.so.6'
  '/home/fweimer/src/gnu/glibc/build-master/elf/ld-linux-x86-64.so.2'
0x7ffff7ffdab0 <_rtld_local+2736>
      alias '/lib64/ld-linux-x86-64.so.2'
      alias 'ld-linux-x86-64.so.2'
  '/home/fweimer/src/gnu/glibc/build-master/elf/testobj6.so' 0x7ffff7fff2f0
      origin 0x7ffff7fff7d0 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias '$ORIGIN/testobj6.so'
  '/home/fweimer/src/gnu/glibc/build-master/elf/testobj1.so' 0x7ffff7fff870
      origin 0x7ffff7fffd80 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias '/home/fweimer/src/gnu/glibc/build-master/elf/testobj1.so'
  '/home/fweimer/src/gnu/glibc/build-master/elf/testobj2.so' 0x7ffff7fffe20
      origin 0x7ffff8000330 "/home/fweimer/src/gnu/glibc/build-master/elf"
      alias '/home/fweimer/src/gnu/glibc/build-master/elf/testobj2.so'
      alias '$ORIGIN/testobj2.so'

-- 
You are receiving this mail because:
You are on the CC list for the bug.

                 reply	other threads:[~2023-07-04  8:32 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=bug-30613-131@http.sourceware.org/bugzilla/ \
    --to=sourceware-bugzilla@sourceware.org \
    --cc=glibc-bugs@sourceware.org \
    /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. 
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 read-only IMAP folder(s) and NNTP newsgroup(s).