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BASH PATCH REPORT
=================
Bash-Release: 3.1
Patch-ID: bash31-023
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:
*** ../bash-3.1.22/builtins/evalstring.c 2014-09-16 22:00:02.000000000 -0400
--- builtins/evalstring.c 2014-10-04 16:10:47.000000000 -0400
***************
*** 44,47 ****
--- 44,48 ----
#include "../redir.h"
#include "../trap.h"
+ #include "../bashintl.h"
#if defined (HISTORY)
***************
*** 224,233 ****
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;
}
--- 225,247 ----
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;
! }
}
***************
*** 289,293 ****
if (flags & SEVAL_ONECMD)
! break;
}
}
--- 303,310 ----
if (flags & SEVAL_ONECMD)
! {
! reset_parser ();
! break;
! }
}
}
*** ../bash-3.1.22/parse.y 2014-09-30 19:49:41.000000000 -0400
--- parse.y 2014-10-04 16:10:47.000000000 -0400
***************
*** 2122,2125 ****
--- 2122,2135 ----
}
+ 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. */
*** ../bash-3.1.22/shell.h 2003-06-01 15:04:36.000000000 -0400
--- shell.h 2014-10-04 16:10:47.000000000 -0400
***************
*** 160,163 ****
--- 160,165 ----
/* 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-3.1/patchlevel.h Wed Jul 20 13:58:20 2005
--- patchlevel.h Wed Dec 7 13:48:42 2005
***************
*** 26,30 ****
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 22
#endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
looks for to find the patch level (for the sccs version string). */
! #define PATCHLEVEL 23
#endif /* _PATCHLEVEL_H_ */
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