Bug 465310 – dev-python/pyelftools-0.20: DynamicTag() fails w/python-3.2

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Samuli Suominen (RETIRED) 2013-04-09 22:21:25 UTC]

$ python --version
Python 3.2.3

$ locale
LANG=en_US.UTF-8
LC_CTYPE=fi_FI.UTF-8
LC_NUMERIC="en_US.UTF-8"
LC_TIME=en_GB.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

$ LC_ALL=C lddtree /bin/bash
Traceback (most recent call last):
  File "/usr/bin/lddtree", line 647, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/usr/bin/lddtree", line 616, in main
    elf = ParseELF(p, options.root, ldpaths)
  File "/usr/bin/lddtree", line 328, in ParseELF
    for t in segment.iter_tags():
  File "/usr/lib64/python3.2/site-packages/elftools/elf/dynamic.py", line 63, in iter_tags
    tag = self.get_tag(n)
  File "/usr/lib64/python3.2/site-packages/elftools/elf/dynamic.py", line 77, in get_tag
    return DynamicTag(entry, self._elffile)
  File "/usr/lib64/python3.2/site-packages/elftools/elf/dynamic.py", line 32, in __init__
    setattr(self, entry.d_tag[3:].lower(), dynstr.get_string(self.entry.d_val))
AttributeError: 'NoneType' object has no attribute 'get_string'

$ lddtree /bin/bash
Traceback (most recent call last):
  File "/usr/bin/lddtree", line 647, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/usr/bin/lddtree", line 616, in main
    elf = ParseELF(p, options.root, ldpaths)
  File "/usr/bin/lddtree", line 328, in ParseELF
    for t in segment.iter_tags():
  File "/usr/lib64/python3.2/site-packages/elftools/elf/dynamic.py", line 63, in iter_tags
    tag = self.get_tag(n)
  File "/usr/lib64/python3.2/site-packages/elftools/elf/dynamic.py", line 77, in get_tag
    return DynamicTag(entry, self._elffile)
  File "/usr/lib64/python3.2/site-packages/elftools/elf/dynamic.py", line 32, in __init__
    setattr(self, entry.d_tag[3:].lower(), dynstr.get_string(self.entry.d_val))
AttributeError: 'NoneType' object has no attribute 'get_string'

[Comment 1 SpanKY 2013-04-10 02:12:43 UTC]

i don't think it's a bug in lddtree

[Comment 2 Samuli Suominen (RETIRED) 2013-04-10 03:12:13 UTC]

works with python 2.7, but not with python 3.2:

[ebuild   R    ] app-misc/pax-utils-0.7  USE="python -caps" 0 kB
[ebuild   R    ]  dev-python/pyelftools-0.20-r2  PYTHON_TARGETS="python2_7 python3_2" 0 kB

[Comment 3 SpanKY 2013-04-10 03:33:15 UTC]

(In reply to comment #2)

yes, you can guess which version of python i develop with ;)

[Comment 4 Arfrever Frehtes Taifersar Arahesis 2013-04-10 03:47:12 UTC]

This bug is caused by Vapier's patch for pyelftools.
- dynstr = elffile.get_section_by_name('.dynstr')
+ dynstr = elffile.get_section_by_name(b'.dynstr')

[Comment 5 SpanKY 2013-04-10 03:56:53 UTC]

(In reply to comment #4)

i think you mean "fixed".  the pyelftools in the tree doesn't do b'.dynstr', it does just '.dynstr'.  that's because the version in the tree is using an old version of my work while the stuff i got merged upstream went through some changes (including adding a "b" prefix to that string).

[Comment 6 Arfrever Frehtes Taifersar Arahesis 2013-04-10 04:08:04 UTC]

(In reply to comment #5)
> (In reply to comment #4)
> 
> i think you mean "fixed".

I have not checked changes in upstream repository. I meant that gentoo-x86/dev-python/pyelftools/files/pyelftools-0.20-dyntags-1.patch has this line:
+            dynstr = elffile.get_section_by_name('.dynstr')

[Comment 7 SpanKY 2013-04-10 04:34:15 UTC]

(In reply to comment #6)

yes, that is what my *old* code did (and that's the version that's in the Gentoo tree right now).  i already fixed upstream before getting it merged into the pyelftools repo.  i'm waiting for the maintainer to tag a new version before updating Gentoo.

[Comment 8 Samuli Suominen (RETIRED) 2013-04-10 07:41:58 UTC]

*** Bug 465362 has been marked as a duplicate of this bug. ***

[Comment 9 SpanKY 2013-08-15 17:09:01 UTC]

should be resolved with pyelftools-0.21-r2