lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 29 Oct 2018 16:26:27 +0100
From: Milian Wolff <milian.wolff@...b.com>
To: Milian Wolff <milian.wolff@...b.com>
Cc: acme@...nel.org, jolsa@...nel.org, Linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf util: take pgoff into account when reporting elf to
libdwfl
On Monday, October 29, 2018 3:16:44 PM CET Milian Wolff wrote:
> Libdwfl parses an ELF file itself and creates mappings for the
> individual sections. Perf on the other hand sees raw mmap events which
> represent individual sections. When we encounter an address pointing
> into a mapping with pgoff != 0, we must take that into account and
> report the file at the non-offset base address.
>
> This fixes unwinding with libdwfl in some cases. E.g. for a file like:
<snip>
> Note that the backtrace is still stopping too early, when
> compared to the nice results obtained via libunwind. It's
> unclear so far what the reason for that is.
The remaining issue is due to a bug in elfutils:
https://sourceware.org/ml/elfutils-devel/2018-q4/msg00089.html
With both patches applied, libunwind and elfutils produce the same output for
the above scenario.
Cheers
--
Milian Wolff | milian.wolff@...b.com | Senior Software Engineer
KDAB (Deutschland) GmbH, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt, C++ and OpenGL Experts
Download attachment "smime.p7s" of type "application/pkcs7-signature" (3826 bytes)
Powered by blists - more mailing lists