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Bash-4.2 Official Patch 44


From: Chet Ramey
Subject: Bash-4.2 Official Patch 44
Date: Sun, 10 Mar 2013 12:13:58 -0400

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

Bash-Release:   4.2
Patch-ID:       bash42-044

Bug-Reported-by:        "Dashing" <address@hidden>
Bug-Reference-ID:       <address@hidden>
Bug-Reference-URL:      
http://lists.gnu.org/archive/html/bug-bash/2013-02/msg00030.html

Bug-Description:

When converting a multibyte string to a wide character string as part of
pattern matching, bash does not handle the end of the string correctly,
causing the search for the NUL to go beyond the end of the string and
reference random memory.  Depending on the contents of that memory, bash
can produce errors or crash. 

Patch (apply with `patch -p0'):

*** ../bash-4.2-patched/lib/glob/xmbsrtowcs.c   2012-07-08 21:53:19.000000000 
-0400
--- lib/glob/xmbsrtowcs.c       2013-02-12 12:00:39.000000000 -0500
***************
*** 217,220 ****
--- 217,226 ----
        n = mbsnrtowcs(wsbuf+wcnum, &p, nms, wsbuf_size-wcnum, &state);
  
+       if (n == 0 && p == 0)
+       {
+         wsbuf[wcnum] = L'\0';
+         break;
+       }
+ 
        /* Compensate for taking single byte on wcs conversion failure above. */
        if (wcslength == 1 && (n == 0 || n == (size_t)-1))
***************
*** 222,226 ****
          state = tmp_state;
          p = tmp_p;
!         wsbuf[wcnum++] = *p++;
        }
        else
--- 228,238 ----
          state = tmp_state;
          p = tmp_p;
!         wsbuf[wcnum] = *p;
!         if (*p == 0)
!           break;
!         else
!           {
!             wcnum++; p++;
!           }
        }
        else

*** ../bash-4.2-patched/patchlevel.h    Sat Jun 12 20:14:48 2010
--- patchlevel.h        Thu Feb 24 21:41:34 2011
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 43
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 44
  
  #endif /* _PATCHLEVEL_H_ */

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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