GNU bug report logs - #7993
cut segmentation fault with unbounded ranges

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Jim Meyering <jim <at> meyering.net>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#7993: closed (cut segmentation fault with unbounded ranges)
Date: Mon, 07 Feb 2011 07:37:01 +0000

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Your message dated Mon, 07 Feb 2011 08:45:36 +0100
with message-id <87ei7kz3rz.fsf <at> meyering.net>
and subject line Re: bug#7993: Acknowledgement (cut segmentation fault with unbounded ranges)
has caused the GNU bug report #7993,
regarding cut segmentation fault with unbounded ranges
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
7993: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7993
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From: Paul Marinescu <paul.marinescu <at> imperial.ac.uk>
To: bug-coreutils <at> gnu.org
Subject: cut segmentation fault with unbounded ranges
Date: Sun, 06 Feb 2011 18:20:11 +0000

In coreutils 8.9 (latest), the following commands trigger an invalid
memory access.

cut -c1234567890- --output-d=: foo
cut -f1234567890- --output-d=: foo
cut -b1234567890- --output-d=: foo

The number 1234567890 is just a random number 'big enough' to make the
invalid access generate a segmentation fault but the invalid access
happens for values as low as 8 (valgrind)

The problem is that ranges going to end of line (i.e., 'x-') are not
taken into account when calculating the size of the printable_field
vector, but their lower bound is used as an index on line 525:

  if (output_delimiter_specified
      && !complement
      && eol_range_start && !is_printable_field (eol_range_start))


Paul

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From: Jim Meyering <jim <at> meyering.net>
To: Paul Marinescu <paul.marinescu <at> imperial.ac.uk>
Cc: 7993-done <at> debbugs.gnu.org
Subject: Re: bug#7993: Acknowledgement (cut segmentation fault with unbounded
	ranges)
Date: Mon, 07 Feb 2011 08:45:36 +0100

> Please ignore this. It's a duplicate submission of bug# 7992

Ok.  marking it closed.

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