[lfs-book] [LFS Trac] #3855: grep-2.22

LFS Trac trac at linuxfromscratch.org
Sun Nov 1 20:41:07 PST 2015

#3855: grep-2.22
 Reporter:  bdubbs@…  |      Owner:  lfs-book@…
     Type:  task      |     Status:  new
 Priority:  normal    |  Milestone:  7.9
Component:  Book      |    Version:  SVN
 Severity:  normal    |   Keywords:

 * Noteworthy changes in release 2.22 (2015-11-01) [stable]

 ** Improvements

   Performance has improved for patterns containing very long strings,
   reducing preprocessing time for an N-byte regexp from O(N^2) to
   only slightly superlinear for most patterns.  Before, a command like
   the following would take over a minute, but now, it takes less than
   a second:
   : | grep -f <(seq -s '' 99999)

   When building grep, 'configure' now uses PCRE's pkg-config module for
   configuration information, rather than attempting to guess it by hand.

 ** Bug fixes

   A DFA matcher bug made this command mistakenly print its input line:
     echo axb | grep -E '^x|x$'
   Likewise for this equivalent command:
     echo axb | grep -e '^x' -e 'x$'
   [bug introduced in grep-2.19 ]

   grep no longer reads from uninitialized memory or from beyond the end
   of the heap-allocated input buffer.  This fix addressed CVE-2015-1345.
   [bug introduced in grep-2.19 ]

   With -z, '.' and '[^x]' in a pattern now consistently match newline.
   Previously, they sometimes matched newline, and sometimes did not.
   [bug introduced in grep-2.4]

   When the JIT stack is exhausted, grep -P now grows the stack rather
   than reporting an internal PCRE error.

   'grep -D skip PATTERN FILE' no longer hangs if FILE is a fifo.
   [bug introduced in grep-2.12]

   --exclude and related options are now matched against entire
   command-line arguments, not against command-line components.
   [bug introduced in grep-2.6]

   Fix performance degradation of grep -Fw in unibyte locales.
   [bug introduced in grep-2.19 ]

Ticket URL: <http://wiki.linuxfromscratch.org/lfs/ticket/3855>
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