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Bug 1527966

Summary: dwarf_aggregate_size() doesn't work for multi-dimensional arrays
Product: Red Hat Enterprise Linux 7 Reporter: Piyush Bhoot <pbhoot>
Component: elfutilsAssignee: Mark Wielaard <mjw>
Status: CLOSED ERRATA QA Contact: Martin Cermak <mcermak>
Severity: high Docs Contact:
Priority: unspecified    
Version: 7.4CC: lmiksik, mbenitez, mcermak, mjw
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: elfutils-0.170-4.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1528027 (view as bug list) Environment:
Last Closed: 2018-04-10 16:17:17 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1528027    
Attachments:
Description Flags
reproducer code none

Description Piyush Bhoot 2017-12-20 16:21:57 UTC 
Created attachment 1370532 [details]
reproducer code

Description of problem:

Hi. I'm observing that dwarf_aggregate_size() returns bogus results when looking at double-dimensional arrays. For instance, looking at

  double dd[3][5];

It says the aggregate is 64-bytes long instead of 120. The bug is that it ends up computing (3+5)*8 instead of 3*5*8.

I'm attaching a simple test case. It loads the current process's debug information, and prints out the size of dd, defined as above. It shows the failure:

  :/tmp$ gcc -g -ldw -lelf dwarf_aggregate_size_bug.c -o dwarf_aggregate_size_bug

  :/tmp$ ./dwarf_aggregate_size_bug                                              
  Found DIE for 'dd'. size: 64

Version : elfutils-0.168-8.el7


Additional info:
Upstream bug with patch 
https://sourceware.org/bugzilla/show_bug.cgi?id=22546
Comment 7 errata-xmlrpc 2018-04-10 16:17:17 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0891