BASH PATCH REPORT

			     =================

Bash-Release:	4.2

Patch-ID:	bash42-043

Bug-Reported-by:	konsolebox <[email protected]>

Bug-Reference-ID:	<CAJnmqwZuGKLgMsMwxRK4LL+2NN+HgvmKzrnode99QBGrcgX1Lw@mail.gmail.com>

Bug-Reference-URL:	http://lists.gnu.org/archive/html/bug-bash/2013-01/msg00138.html

Bug-Description:

When SIGCHLD is trapped, and a SIGCHLD trap handler runs when a pending

`read -t' invocation times out and generates SIGALRM, bash can crash with

a segmentation fault.

Patch (apply with `patch -p0'):

*** ../bash-4.2-patched/builtins/read.def	2012-10-31 21:22:51.000517000 -0400

--- builtins/read.def	2013-01-25 10:28:16.000038000 -0500

***************

*** 386,393 ****

  	  /* Tricky.  The top of the unwind-protect stack is the free of

  	     input_string.  We want to run all the rest and use input_string,

! 	     so we have to remove it from the stack. */

! 	  remove_unwind_protect ();

! 	  run_unwind_frame ("read_builtin");

  	  input_string[i] = '\0';	/* make sure it's terminated */

  	  retval = 128+SIGALRM;

  	  goto assign_vars;

--- 386,403 ----

  	  /* Tricky.  The top of the unwind-protect stack is the free of

  	     input_string.  We want to run all the rest and use input_string,

! 	     so we have to save input_string temporarily, run the unwind-

! 	     protects, then restore input_string so we can use it later. */

! 

  	  input_string[i] = '\0';	/* make sure it's terminated */

+ 	  if (i == 0)

+ 	    {

+ 	      t = (char *)xmalloc (1);

+ 	      t[0] = 0;

+ 	    }

+ 	  else

+ 	    t = savestring (input_string);

+ 

+ 	  run_unwind_frame ("read_builtin");

+ 	  input_string = t;

  	  retval = 128+SIGALRM;

  	  goto assign_vars;

*** ../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 42

  #endif /* _PATCHLEVEL_H_ */

--- 26,30 ----

     looks for to find the patch level (for the sccs version string). */

! #define PATCHLEVEL 43

  #endif /* _PATCHLEVEL_H_ */