Bash-3.2 Official Patch 10

[Chet Ramey]

                             BASH PATCH REPORT
                             =================

Bash-Release: 3.2
Patch-ID: bash32-010

Bug-Reported-by:        Ryan Waldron <rew@erebor.com>
Bug-Reference-ID:       <20070119065603.546D011E9C@kansas.erebor.com>
Bug-Reference-URL:      
http://lists.gnu.org/archive/html/bug-bash/2007-01/msg00059.html

Bug-Description:

The glibc implementation of regcomp/regexec does not allow backslashes to
escape "ordinary" pattern characters when matching.  Bash used backslashes
to quote all characters when the pattern argument to the [[ special
command's =~ operator was quoted.  This caused the match to fail on Linux
and other systems using GNU libc.

Patch:

*** ../bash-3.2.9/pathexp.h     Sat Feb 19 17:23:18 2005
--- pathexp.h   Wed Jan 31 22:53:16 2007
***************
*** 1,5 ****
  /* pathexp.h -- The shell interface to the globbing library. */
  
! /* Copyright (C) 1987-2005 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
--- 1,5 ----
  /* pathexp.h -- The shell interface to the globbing library. */
  
! /* Copyright (C) 1987-2007 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
***************
*** 33,36 ****
--- 33,37 ----
  #define QGLOB_CVTNULL 0x01    /* convert QUOTED_NULL strings to '\0' */
  #define QGLOB_FILENAME        0x02    /* do correct quoting for matching 
filenames */
+ #define QGLOB_REGEXP  0x04    /* quote an ERE for regcomp/regexec */
  
  #if defined (EXTENDED_GLOB)
*** ../bash-3.2.9/pathexp.c     Mon May  6 13:43:05 2002
--- pathexp.c   Mon Feb 26 16:59:23 2007
***************
*** 1,5 ****
  /* pathexp.c -- The shell interface to the globbing library. */
  
! /* Copyright (C) 1995-2002 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
--- 1,5 ----
  /* pathexp.c -- The shell interface to the globbing library. */
  
! /* Copyright (C) 1995-2007 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
***************
*** 111,114 ****
--- 111,141 ----
  }
  
+ /* Return 1 if C is a character that is `special' in a POSIX ERE and needs to
+    be quoted to match itself. */
+ static inline int
+ ere_char (c)
+      int c;
+ {
+   switch (c)
+     {
+     case '.':
+     case '[':
+     case '\\':
+     case '(':
+     case ')':
+     case '*':
+     case '+':
+     case '?':
+     case '{':
+     case '|':
+     case '^':
+     case '$':
+       return 1;
+     default: 
+       return 0;
+     }
+   return (0);
+ }
+ 
  /* PATHNAME can contain characters prefixed by CTLESC; this indicates
     that the character is to be quoted.  We quote it here in the style
***************
*** 143,146 ****
--- 170,175 ----
          if ((qflags & QGLOB_FILENAME) && pathname[i+1] == '/')
            continue;
+         if ((qflags & QGLOB_REGEXP) && ere_char (pathname[i+1]) == 0)
+           continue;
          temp[j++] = '\\';
          i++;
*** ../bash-3.2.9/subst.c       Tue Nov  7 16:14:41 2006
--- subst.c     Wed Jan 31 23:09:58 2007
***************
*** 5,9 ****
       beauty, but, hey, you're alright.'' */
  
! /* Copyright (C) 1987-2006 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
--- 5,9 ----
       beauty, but, hey, you're alright.'' */
  
! /* Copyright (C) 1987-2007 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
***************
*** 2647,2655 ****
  /* This needs better error handling. */
  /* Expand W for use as an argument to a unary or binary operator in a
!    [[...]] expression.  If SPECIAL is nonzero, this is the rhs argument
     to the != or == operator, and should be treated as a pattern.  In
!    this case, we quote the string specially for the globbing code.  The
!    caller is responsible for removing the backslashes if the unquoted
!    words is needed later. */   
  char *
  cond_expand_word (w, special)
--- 2647,2656 ----
  /* This needs better error handling. */
  /* Expand W for use as an argument to a unary or binary operator in a
!    [[...]] expression.  If SPECIAL is 1, this is the rhs argument
     to the != or == operator, and should be treated as a pattern.  In
!    this case, we quote the string specially for the globbing code.  If
!    SPECIAL is 2, this is an rhs argument for the =~ operator, and should
!    be quoted appropriately for regcomp/regexec.  The caller is responsible
!    for removing the backslashes if the unquoted word is needed later. */   
  char *
  cond_expand_word (w, special)
***************
*** 2659,2662 ****
--- 2660,2664 ----
    char *r, *p;
    WORD_LIST *l;
+   int qflags;
  
    if (w->word == 0 || w->word[0] == '\0')
***************
*** 2673,2678 ****
        else
        {
          p = string_list (l);
!         r = quote_string_for_globbing (p, QGLOB_CVTNULL);
          free (p);
        }
--- 2675,2683 ----
        else
        {
+         qflags = QGLOB_CVTNULL;
+         if (special == 2)
+           qflags |= QGLOB_REGEXP;
          p = string_list (l);
!         r = quote_string_for_globbing (p, qflags);
          free (p);
        }
*** ../bash-3.2.9/execute_cmd.c Sat Aug 26 00:23:17 2006
--- execute_cmd.c       Wed Jan 31 23:12:06 2007
***************
*** 1,5 ****
  /* execute_cmd.c -- Execute a COMMAND structure. */
  
! /* Copyright (C) 1987-2005 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
--- 1,5 ----
  /* execute_cmd.c -- Execute a COMMAND structure. */
  
! /* Copyright (C) 1987-2007 Free Software Foundation, Inc.
  
     This file is part of GNU Bash, the Bourne Again SHell.
***************
*** 2547,2551 ****
        if (arg1 == 0)
        arg1 = nullstr;
!       arg2 = cond_expand_word (cond->right->op, patmatch||rmatch);
        if (arg2 == 0)
        arg2 = nullstr;
--- 2547,2551 ----
        if (arg1 == 0)
        arg1 = nullstr;
!       arg2 = cond_expand_word (cond->right->op, rmatch ? 2 : (patmatch ? 1 : 
0));
        if (arg2 == 0)
        arg2 = nullstr;
*** ../bash-3.2/patchlevel.h    Thu Apr 13 08:31:04 2006
--- patchlevel.h        Mon Oct 16 14:22:54 2006
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 9
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 10
  
  #endif /* _PATCHLEVEL_H_ */

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                                Live Strong.
Chet Ramey, ITS, CWRU    chet@case.edu    http://tiswww.tis.case.edu/~chet/