BASH PATCH REPORT ================= Bash-Release: 4.2 Patch-ID: bash42-051 Bug-Reported-by: Florian Weimer 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_ */