Bash-5.0 Official Patch 2

[Chet Ramey]

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

Bash-Release:   5.0
Patch-ID:       bash50-002

Bug-Reported-by:        Ante Peric <synthmeat@gmail.com>
Bug-Reference-ID:       <B7E3B567-2467-4F7B-B6B9-CA4E75A9C93F@gmail.com>
Bug-Reference-URL:      
http://lists.gnu.org/archive/html/bug-bash/2019-01/msg00095.html

Bug-Description:

When an alias value ends with an unquoted literal tab (not part of a quoted
string or comment), alias expansion cannot correctly detect the end of the
alias value after expanding it.

Patch (apply with `patch -p0'):

*** ../bash-5.0/parser.h        2018-12-28 19:11:18.000000000 -0500
--- parser.h    2019-01-11 15:13:03.000000000 -0500
***************
*** 48,51 ****
--- 48,52 ----
  #define PST_REDIRLIST 0x080000        /* parsing a list of redirections 
preceding a simple command name */
  #define PST_COMMENT   0x100000        /* parsing a shell comment; used by 
aliases */
+ #define PST_ENDALIAS  0x200000        /* just finished expanding and 
consuming an alias */
  
  /* Definition of the delimiter stack.  Needed by parse.y and bashhist.c. */
*** ../bash-5.0/parse.y 2019-01-02 13:57:34.000000000 -0500
--- parse.y     2019-01-14 08:23:31.000000000 -0500
***************
*** 2558,2567 ****
        pushed_string_list->flags != PSH_DPAREN &&
        (parser_state & PST_COMMENT) == 0 &&
        shell_input_line_index > 0 &&
!       shell_input_line[shell_input_line_index-1] != ' ' &&
        shell_input_line[shell_input_line_index-1] != '\n' &&
        shellmeta (shell_input_line[shell_input_line_index-1]) == 0 &&
        (current_delimiter (dstack) != '\'' && current_delimiter (dstack) != 
'"'))
      {
        return ' ';     /* END_ALIAS */
      }
--- 2558,2569 ----
        pushed_string_list->flags != PSH_DPAREN &&
        (parser_state & PST_COMMENT) == 0 &&
+       (parser_state & PST_ENDALIAS) == 0 &&   /* only once */
        shell_input_line_index > 0 &&
!       shellblank (shell_input_line[shell_input_line_index-1]) == 0 &&
        shell_input_line[shell_input_line_index-1] != '\n' &&
        shellmeta (shell_input_line[shell_input_line_index-1]) == 0 &&
        (current_delimiter (dstack) != '\'' && current_delimiter (dstack) != 
'"'))
      {
+       parser_state |= PST_ENDALIAS;
        return ' ';     /* END_ALIAS */
      }
***************
*** 2572,2575 ****
--- 2574,2578 ----
    if (uc == 0 && pushed_string_list && pushed_string_list->flags != 
PSH_SOURCE)
      {
+       parser_state &= ~PST_ENDALIAS;
        pop_string ();
        uc = shell_input_line[shell_input_line_index];
*** ../bash-5.0/y.tab.c 2019-01-02 13:57:43.000000000 -0500
--- y.tab.c     2019-01-14 08:39:23.000000000 -0500
***************
*** 4874,4883 ****
        pushed_string_list->flags != PSH_DPAREN &&
        (parser_state & PST_COMMENT) == 0 &&
        shell_input_line_index > 0 &&
!       shell_input_line[shell_input_line_index-1] != ' ' &&
        shell_input_line[shell_input_line_index-1] != '\n' &&
        shellmeta (shell_input_line[shell_input_line_index-1]) == 0 &&
        (current_delimiter (dstack) != '\'' && current_delimiter (dstack) != 
'"'))
      {
        return ' ';     /* END_ALIAS */
      }
--- 4874,4885 ----
        pushed_string_list->flags != PSH_DPAREN &&
        (parser_state & PST_COMMENT) == 0 &&
+       (parser_state & PST_ENDALIAS) == 0 &&   /* only once */
        shell_input_line_index > 0 &&
!       shellblank (shell_input_line[shell_input_line_index-1]) == 0 &&
        shell_input_line[shell_input_line_index-1] != '\n' &&
        shellmeta (shell_input_line[shell_input_line_index-1]) == 0 &&
        (current_delimiter (dstack) != '\'' && current_delimiter (dstack) != 
'"'))
      {
+       parser_state |= PST_ENDALIAS;
        return ' ';     /* END_ALIAS */
      }
***************
*** 4888,4891 ****
--- 4890,4894 ----
    if (uc == 0 && pushed_string_list && pushed_string_list->flags != 
PSH_SOURCE)
      {
+       parser_state &= ~PST_ENDALIAS;
        pop_string ();
        uc = shell_input_line[shell_input_line_index];
*** ../bash-5.0/patchlevel.h    2016-06-22 14:51:03.000000000 -0400
--- patchlevel.h        2016-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 1
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 2
  
  #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/