bash/bash43-030

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

Bash-Release:	4.3
Patch-ID:	bash43-030

Bug-Reported-by:	Michal Zalewski <lcamtuf@coredump.cx>
Bug-Reference-ID:
Bug-Reference-URL:

Bug-Description:

A combination of nested command substitutions and function importing from
the environment can cause bash to execute code appearing in the environment
variable value following the function definition.

Patch (apply with `patch -p0'):

*** ../bash-4.3.29/builtins/evalstring.c	2014-10-01 12:57:47.000000000 -0400
--- builtins/evalstring.c	2014-10-03 11:57:04.000000000 -0400
***************
*** 309,318 ****
  	      struct fd_bitmap *bitmap;
  
! 	      if ((flags & SEVAL_FUNCDEF) && command->type != cm_function_def)
  		{
! 		  internal_warning ("%s: ignoring function definition attempt", from_file);
! 		  should_jump_to_top_level = 0;
! 		  last_result = last_command_exit_value = EX_BADUSAGE;
! 		  break;
  		}
  
--- 313,335 ----
  	      struct fd_bitmap *bitmap;
  
! 	      if (flags & SEVAL_FUNCDEF)
  		{
! 		  char *x;
! 
! 		  /* If the command parses to something other than a straight
! 		     function definition, or if we have not consumed the entire
! 		     string, or if the parser has transformed the function
! 		     name (as parsing will if it begins or ends with shell
! 		     whitespace, for example), reject the attempt */
! 		  if (command->type != cm_function_def ||
! 		      ((x = parser_remaining_input ()) && *x) ||
! 		      (STREQ (from_file, command->value.Function_def->name->word) == 0))
! 		    {
! 		      internal_warning (_("%s: ignoring function definition attempt"), from_file);
! 		      should_jump_to_top_level = 0;
! 		      last_result = last_command_exit_value = EX_BADUSAGE;
! 		      reset_parser ();
! 		      break;
! 		    }
  		}
  
***************
*** 379,383 ****
  
  	      if (flags & SEVAL_ONECMD)
! 		break;
  	    }
  	}
--- 396,403 ----
  
  	      if (flags & SEVAL_ONECMD)
! 		{
! 		  reset_parser ();
! 		  break;
! 		}
  	    }
  	}
*** ../bash-4.3.29/parse.y	2014-10-01 12:58:43.000000000 -0400
--- parse.y	2014-10-03 14:48:59.000000000 -0400
***************
*** 2539,2542 ****
--- 2539,2552 ----
  }
  
+ char *
+ parser_remaining_input ()
+ {
+   if (shell_input_line == 0)
+     return 0;
+   if (shell_input_line_index < 0 || shell_input_line_index >= shell_input_line_len)
+     return '\0';	/* XXX */
+   return (shell_input_line + shell_input_line_index);
+ }
+ 
  #ifdef INCLUDE_UNUSED
  /* Back the input pointer up by one, effectively `ungetting' a character. */
***************
*** 4028,4033 ****
    /* reset_parser clears shell_input_line and associated variables */
    restore_input_line_state (&ls);
!   if (interactive)
!     token_to_read = 0;
  
    /* Need to find how many characters parse_and_execute consumed, update
--- 4053,4058 ----
    /* reset_parser clears shell_input_line and associated variables */
    restore_input_line_state (&ls);
! 
!   token_to_read = 0;
  
    /* Need to find how many characters parse_and_execute consumed, update
*** ../bash-4.3.29/shell.h	2014-10-01 12:57:39.000000000 -0400
--- shell.h	2014-10-03 14:49:12.000000000 -0400
***************
*** 181,184 ****
--- 181,186 ----
  
  /* Let's try declaring these here. */
+ extern char *parser_remaining_input __P((void));
+ 
  extern sh_parser_state_t *save_parser_state __P((sh_parser_state_t *));
  extern void restore_parser_state __P((sh_parser_state_t *));
*** ../bash-4.3/patchlevel.h	2012-12-29 10:47:57.000000000 -0500
--- patchlevel.h	2014-03-20 20:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 29
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 30
  
  #endif /* _PATCHLEVEL_H_ */