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+ BASH PATCH REPORT
+ =================
+
+Bash-Release: 4.2
+Patch-ID: bash42-051
+
+Bug-Reported-by: Florian Weimer <fweimer@redhat.com>
+Bug-Reference-ID:
+Bug-Reference-URL:
+
+Bug-Description:
+
+There are two local buffer overflows in parse.y that can cause the shell
+to dump core when given many here-documents attached to a single command
+or many nested loops.
+
+Patch (apply with `patch -p0'):
+
+*** ../bash-4.2.50/parse.y 2014-09-27 12:18:53.000000000 -0400
+--- parse.y 2014-09-30 19:24:19.000000000 -0400
+***************
+*** 168,171 ****
+--- 168,174 ----
+ static int reserved_word_acceptable __P((int));
+ static int yylex __P((void));
++
++ static void push_heredoc __P((REDIRECT *));
++ static char *mk_alexpansion __P((char *));
+ static int alias_expand_token __P((char *));
+ static int time_command_acceptable __P((void));
+***************
+*** 265,269 ****
+ /* Variables to manage the task of reading here documents, because we need to
+ defer the reading until after a complete command has been collected. */
+! static REDIRECT *redir_stack[10];
+ int need_here_doc;
+
+--- 268,274 ----
+ /* Variables to manage the task of reading here documents, because we need to
+ defer the reading until after a complete command has been collected. */
+! #define HEREDOC_MAX 16
+!
+! static REDIRECT *redir_stack[HEREDOC_MAX];
+ int need_here_doc;
+
+***************
+*** 307,311 ****
+ index is decremented after a case, select, or for command is parsed. */
+ #define MAX_CASE_NEST 128
+! static int word_lineno[MAX_CASE_NEST];
+ static int word_top = -1;
+
+--- 312,316 ----
+ index is decremented after a case, select, or for command is parsed. */
+ #define MAX_CASE_NEST 128
+! static int word_lineno[MAX_CASE_NEST+1];
+ static int word_top = -1;
+
+***************
+*** 520,524 ****
+ redir.filename = $2;
+ $$ = make_redirection (source, r_reading_until, redir, 0);
+! redir_stack[need_here_doc++] = $$;
+ }
+ | NUMBER LESS_LESS WORD
+--- 525,529 ----
+ redir.filename = $2;
+ $$ = make_redirection (source, r_reading_until, redir, 0);
+! push_heredoc ($$);
+ }
+ | NUMBER LESS_LESS WORD
+***************
+*** 527,531 ****
+ redir.filename = $3;
+ $$ = make_redirection (source, r_reading_until, redir, 0);
+! redir_stack[need_here_doc++] = $$;
+ }
+ | REDIR_WORD LESS_LESS WORD
+--- 532,536 ----
+ redir.filename = $3;
+ $$ = make_redirection (source, r_reading_until, redir, 0);
+! push_heredoc ($$);
+ }
+ | REDIR_WORD LESS_LESS WORD
+***************
+*** 534,538 ****
+ redir.filename = $3;
+ $$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN);
+! redir_stack[need_here_doc++] = $$;
+ }
+ | LESS_LESS_MINUS WORD
+--- 539,543 ----
+ redir.filename = $3;
+ $$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN);
+! push_heredoc ($$);
+ }
+ | LESS_LESS_MINUS WORD
+***************
+*** 541,545 ****
+ redir.filename = $2;
+ $$ = make_redirection (source, r_deblank_reading_until, redir, 0);
+! redir_stack[need_here_doc++] = $$;
+ }
+ | NUMBER LESS_LESS_MINUS WORD
+--- 546,550 ----
+ redir.filename = $2;
+ $$ = make_redirection (source, r_deblank_reading_until, redir, 0);
+! push_heredoc ($$);
+ }
+ | NUMBER LESS_LESS_MINUS WORD
+***************
+*** 548,552 ****
+ redir.filename = $3;
+ $$ = make_redirection (source, r_deblank_reading_until, redir, 0);
+! redir_stack[need_here_doc++] = $$;
+ }
+ | REDIR_WORD LESS_LESS_MINUS WORD
+--- 553,557 ----
+ redir.filename = $3;
+ $$ = make_redirection (source, r_deblank_reading_until, redir, 0);
+! push_heredoc ($$);
+ }
+ | REDIR_WORD LESS_LESS_MINUS WORD
+***************
+*** 555,559 ****
+ redir.filename = $3;
+ $$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
+! redir_stack[need_here_doc++] = $$;
+ }
+ | LESS_LESS_LESS WORD
+--- 560,564 ----
+ redir.filename = $3;
+ $$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
+! push_heredoc ($$);
+ }
+ | LESS_LESS_LESS WORD
+***************
+*** 2534,2537 ****
+--- 2539,2557 ----
+ static int esacs_needed_count;
+
++ static void
++ push_heredoc (r)
++ REDIRECT *r;
++ {
++ if (need_here_doc >= HEREDOC_MAX)
++ {
++ last_command_exit_value = EX_BADUSAGE;
++ need_here_doc = 0;
++ report_syntax_error (_("maximum here-document count exceeded"));
++ reset_parser ();
++ exit_shell (last_command_exit_value);
++ }
++ redir_stack[need_here_doc++] = r;
++ }
++
+ void
+ gather_here_documents ()
+*** ../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 50
+
+ #endif /* _PATCHLEVEL_H_ */
+--- 26,30 ----
+ looks for to find the patch level (for the sccs version string). */
+
+! #define PATCHLEVEL 51
+
+ #endif /* _PATCHLEVEL_H_ */