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Bash-5.0 Official Patch 17


From: Chet Ramey
Subject: Bash-5.0 Official Patch 17
Date: Fri, 24 Apr 2020 10:52:23 -0400

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

Bash-Release:   5.0
Patch-ID:       bash50-017

Bug-Reported-by:        Valentin Lab <address@hidden>
Bug-Reference-ID:       <address@hidden>
Bug-Reference-URL:      
https://lists.gnu.org/archive/html/bug-bash/2020-03/msg00062.html

Bug-Description:

There were cases where patch 16 reaped process substitution file descriptors
(or FIFOs) and processes to early. This is a better fix for the problem that
bash50-016 attempted to solve.

Patch (apply with `patch -p0'):

*** ../bash-5.0-patched/subst.c 2019-08-29 11:16:49.000000000 -0400
--- subst.c     2020-04-02 16:24:19.000000000 -0400
***************
*** 5337,5341 ****
  }
  
! char *
  copy_fifo_list (sizep)
       int *sizep;
--- 5337,5341 ----
  }
  
! void *
  copy_fifo_list (sizep)
       int *sizep;
***************
*** 5343,5347 ****
    if (sizep)
      *sizep = 0;
!   return (char *)NULL;
  }
  
--- 5343,5347 ----
    if (sizep)
      *sizep = 0;
!   return (void *)NULL;
  }
  
***************
*** 5409,5414 ****
        if (fifo_list[i].file)
          {
!           fifo_list[j].file = fifo_list[i].file;
!           fifo_list[j].proc = fifo_list[i].proc;
            j++;
          }
--- 5409,5419 ----
        if (fifo_list[i].file)
          {
!           if (i != j)
!             {
!               fifo_list[j].file = fifo_list[i].file;
!               fifo_list[j].proc = fifo_list[i].proc;
!               fifo_list[i].file = (char *)NULL;
!               fifo_list[i].proc = 0;
!             }
            j++;
          }
***************
*** 5426,5433 ****
  void
  close_new_fifos (list, lsize)
!      char *list;
       int lsize;
  {
    int i;
  
    if (list == 0)
--- 5431,5439 ----
  void
  close_new_fifos (list, lsize)
!      void *list;
       int lsize;
  {
    int i;
+   char *plist;
  
    if (list == 0)
***************
*** 5437,5442 ****
      }
  
!   for (i = 0; i < lsize; i++)
!     if (list[i] == 0 && i < fifo_list_size && fifo_list[i].proc != -1)
        unlink_fifo (i);
  
--- 5443,5448 ----
      }
  
!   for (plist = (char *)list, i = 0; i < lsize; i++)
!     if (plist[i] == 0 && i < fifo_list_size && fifo_list[i].proc != -1)
        unlink_fifo (i);
  
***************
*** 5560,5568 ****
  }
  
! char *
  copy_fifo_list (sizep)
       int *sizep;
  {
!   char *ret;
  
    if (nfds == 0 || totfds == 0)
--- 5566,5574 ----
  }
  
! void *
  copy_fifo_list (sizep)
       int *sizep;
  {
!   void *ret;
  
    if (nfds == 0 || totfds == 0)
***************
*** 5570,5579 ****
        if (sizep)
        *sizep = 0;
!       return (char *)NULL;
      }
  
    if (sizep)
      *sizep = totfds;
!   ret = (char *)xmalloc (totfds * sizeof (pid_t));
    return (memcpy (ret, dev_fd_list, totfds * sizeof (pid_t)));
  }
--- 5576,5585 ----
        if (sizep)
        *sizep = 0;
!       return (void *)NULL;
      }
  
    if (sizep)
      *sizep = totfds;
!   ret = xmalloc (totfds * sizeof (pid_t));
    return (memcpy (ret, dev_fd_list, totfds * sizeof (pid_t)));
  }
***************
*** 5648,5655 ****
  void
  close_new_fifos (list, lsize)
!      char *list;
       int lsize;
  {
    int i;
  
    if (list == 0)
--- 5654,5662 ----
  void
  close_new_fifos (list, lsize)
!      void *list;
       int lsize;
  {
    int i;
+   pid_t *plist;
  
    if (list == 0)
***************
*** 5659,5664 ****
      }
  
!   for (i = 0; i < lsize; i++)
!     if (list[i] == 0 && i < totfds && dev_fd_list[i])
        unlink_fifo (i);
  
--- 5666,5671 ----
      }
  
!   for (plist = (pid_t *)list, i = 0; i < lsize; i++)
!     if (plist[i] == 0 && i < totfds && dev_fd_list[i])
        unlink_fifo (i);
  
*** ../bash-5.0-patched/subst.h 2018-10-21 18:46:09.000000000 -0400
--- subst.h     2020-04-02 16:29:28.000000000 -0400
***************
*** 274,280 ****
  extern void unlink_fifo __P((int));
  
! extern char *copy_fifo_list __P((int *));
! extern void unlink_new_fifos __P((char *, int));
! extern void close_new_fifos __P((char *, int));
  
  extern void clear_fifo_list __P((void));
--- 274,279 ----
  extern void unlink_fifo __P((int));
  
! extern void *copy_fifo_list __P((int *));
! extern void close_new_fifos __P((void *, int));
  
  extern void clear_fifo_list __P((void));
*** ../bash-5.0-patched/execute_cmd.c   2020-02-06 20:16:48.000000000 -0500
--- execute_cmd.c       2020-04-02 17:00:10.000000000 -0400
***************
*** 565,569 ****
  #if defined (PROCESS_SUBSTITUTION)
    volatile int ofifo, nfifo, osize, saved_fifo;
!   volatile char *ofifo_list;
  #endif
  
--- 565,569 ----
  #if defined (PROCESS_SUBSTITUTION)
    volatile int ofifo, nfifo, osize, saved_fifo;
!   volatile void *ofifo_list;
  #endif
  
***************
*** 751,760 ****
  #  endif
  
!   if (variable_context != 0)  /* XXX - also if sourcelevel != 0? */
      {
        ofifo = num_fifos ();
        ofifo_list = copy_fifo_list ((int *)&osize);
        begin_unwind_frame ("internal_fifos");
!       add_unwind_protect (xfree, ofifo_list);
        saved_fifo = 1;
      }
--- 751,762 ----
  #  endif
  
!   /* XXX - also if sourcelevel != 0? */
!   if (variable_context != 0)
      {
        ofifo = num_fifos ();
        ofifo_list = copy_fifo_list ((int *)&osize);
        begin_unwind_frame ("internal_fifos");
!       if (ofifo_list)
!       add_unwind_protect (xfree, ofifo_list);
        saved_fifo = 1;
      }
***************
*** 1100,1123 ****
        nfifo = num_fifos ();
        if (nfifo > ofifo)
!       close_new_fifos ((char *)ofifo_list, osize);
        free ((void *)ofifo_list);
        discard_unwind_frame ("internal_fifos");
      }
- # if defined (HAVE_DEV_FD)
-   /* Reap process substitutions at the end of loops */
-   switch (command->type)
-     {
-     case cm_while:
-     case cm_until:
-     case cm_for:
-     case cm_group:
- #    if defined (ARITH_FOR_COMMAND)
-     case cm_arith_for:
- #    endif
-       reap_procsubs ();
-     default:
-       break;
-     }
- #  endif /* HAVE_DEV_FD */
  #endif
  
--- 1102,1109 ----
        nfifo = num_fifos ();
        if (nfifo > ofifo)
!       close_new_fifos ((void *)ofifo_list, osize);
        free ((void *)ofifo_list);
        discard_unwind_frame ("internal_fifos");
      }
  #endif
  

*** ../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 16
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 17
  
  #endif /* _PATCHLEVEL_H_ */

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



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