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Bash-5.2 official patch 4


From: Chet Ramey
Subject: Bash-5.2 official patch 4
Date: Tue, 8 Nov 2022 09:48:52 -0500

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

Bash-Release:   5.2
Patch-ID:       bash52-004

Bug-Reported-by:        Antoine <bug-bash@glitchimini.net>
Bug-Reference-ID:       <8bd59753-05ff-9b09-2337-2c7f52ded650@glitchimini.net>
Bug-Reference-URL:      
https://lists.gnu.org/archive/html/bug-bash/2022-10/msg00022.html

Bug-Description:

Bash needs to keep better track of nested brace expansions to avoid problems
with quoting and POSIX semantics.

Patch (apply with `patch -p0'):

*** ../bash-5.2-patched/subst.c 2022-10-05 10:22:02.000000000 -0400
--- subst.c     2022-10-06 15:19:08.000000000 -0400
***************
*** 1799,1802 ****
--- 1804,1810 ----
  }
  
+ #define PARAMEXPNEST_MAX      32      // for now
+ static int dbstate[PARAMEXPNEST_MAX];
+ 
  /* Extract a parameter expansion expression within ${ and } from STRING.
     Obey the Posix.2 rules for finding the ending `}': count braces while
***************
*** 1829,1832 ****
--- 1837,1842 ----
      return (extract_heredoc_dolbrace_string (string, sindex, quoted, flags));
  
+   dbstate[0] = dolbrace_state;
+ 
    pass_character = 0;
    nesting_level = 1;
***************
*** 1853,1856 ****
--- 1863,1868 ----
        if (string[i] == '$' && string[i+1] == LBRACE)
        {
+         if (nesting_level < PARAMEXPNEST_MAX)
+           dbstate[nesting_level] = dolbrace_state;
          nesting_level++;
          i += 2;
***************
*** 1865,1868 ****
--- 1877,1881 ----
          if (nesting_level == 0)
            break;
+         dolbrace_state = (nesting_level < PARAMEXPNEST_MAX) ? 
dbstate[nesting_level] : dbstate[0];    /* Guess using initial state */
          i++;
          continue;
*** ../bash-5.2/patchlevel.h    2020-06-22 14:51:03.000000000 -0400
--- patchlevel.h        2020-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 3
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 4
  
  #endif /* _PATCHLEVEL_H_ */

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/



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