public inbox for elfutils@sourceware.org
 help / color / mirror / Atom feed
From: Mark Wielaard <mark@klomp.org>
To: Alexander Egorenkov <egorenar-dev@posteo.net>
Cc: elfutils-devel@sourceware.org
Subject: Re: Adding a new section to an ELF file aborts with Assertion `shdr != NULL'
Date: Wed, 8 Sep 2021 23:29:33 +0200	[thread overview]
Message-ID: <YTkrPV/07Mqo9oEC@wildebeest.org> (raw)
In-Reply-To: <87tuj020ro.fsf@posteo.net>

Hi Alex,

On Sat, Sep 04, 2021 at 08:38:51AM +0000, Alexander Egorenkov via Elfutils-devel wrote:
> i'm facing an issue with libelf when i try to add a new section to an
> ELF file.
> 
> How to reproduce the issue:
> 1. Create a simple ELF file with libelf containing only 2 sections, NULL and
> a string table
> 2. Close ELF file
> 3. Reopen the new ELF file in RW mode with libelf
> 4. Add new section with elf_newscn()
> 5. Update ELF with elf_update()
> 6. Assertion appears
> 
> The weird thing is that if i add only a new program segment then
> everything goes well. But as soon as i add a new section, it fails.
> 
> Error message:
> 
> test: elf32_updatenull.c:214: __elf64_updatenull_wrlock: Assertion `shdr
> != NULL' failed.
> 
> Any hint what i'm doing wrong ? 

I don't immediately know. Could you post the code you are using and/or
the generated file after step 2? That might make it a bit easier to
see exactly what is going on.

Thanks,

Mark


      parent reply	other threads:[~2021-09-08 21:29 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-04  8:38 Alexander Egorenkov
2021-09-04  9:13 ` Alexander Egorenkov
2021-09-08 21:29 ` Mark Wielaard [this message]

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=YTkrPV/07Mqo9oEC@wildebeest.org \
    --to=mark@klomp.org \
    --cc=egorenar-dev@posteo.net \
    --cc=elfutils-devel@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).