From owner-freebsd-stable Mon Mar 10 13:50:47 2003 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2A90737B401 for ; Mon, 10 Mar 2003 13:50:44 -0800 (PST) Received: from murmeldjur.it.su.se (murmeldjur.it.su.se [130.237.95.79]) by mx1.FreeBSD.org (Postfix) with ESMTP id D77CC43FCB for ; Mon, 10 Mar 2003 13:50:42 -0800 (PST) (envelope-from rnyberg@murmeldjur.it.su.se) Received: from murmeldjur.it.su.se (localhost [127.0.0.1]) by murmeldjur.it.su.se (8.12.8/8.12.7) with ESMTP id h2ALoeYs060942 for ; Mon, 10 Mar 2003 22:50:40 +0100 (CET) (envelope-from rnyberg@murmeldjur.it.su.se) Received: (from rnyberg@localhost) by murmeldjur.it.su.se (8.12.8/8.12.8/Submit) id h2ALoea6060941 for freebsd-stable@freebsd.org; Mon, 10 Mar 2003 22:50:40 +0100 (CET) Date: Mon, 10 Mar 2003 22:50:40 +0100 From: Richard Nyberg To: freebsd-stable@freebsd.org Subject: -pthread and test program Message-ID: <20030310215040.GA60926@murmeldjur.it.su.se> Mail-Followup-To: Richard Nyberg , freebsd-stable@freebsd.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="X1bOJ3K7DJ5YkBrT" Content-Disposition: inline User-Agent: Mutt/1.4i Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG --X1bOJ3K7DJ5YkBrT Content-Type: text/plain; charset=us-ascii Content-Disposition: inline This program i from the lang/ocaml port. It is supposed to check wether stack overflow is detectable or not. The test is compiled in two different ways: 1) cc stackov.c 2) cc -pthread stackov.c The first binary exits fast with a value of 0. The second binary however, never exits. It just runs forever eating CPU. Is this a bug in libc_r? -Richard --X1bOJ3K7DJ5YkBrT Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="stackov.c" /***********************************************************************/ /* */ /* Objective Caml */ /* */ /* Xavier Leroy, projet Cristal, INRIA Rocquencourt */ /* */ /* Copyright 2001 Institut National de Recherche en Informatique et */ /* en Automatique. All rights reserved. This file is distributed */ /* under the terms of the GNU Library General Public License, with */ /* the special exception on linking described in file ../../LICENSE. */ /* */ /***********************************************************************/ /* $Id: stackov.c,v 1.3 2001/12/07 13:39:44 xleroy Exp $ */ #include #include #include static char sig_alt_stack[SIGSTKSZ]; static char * system_stack_top; #if defined(TARGET_i386) && defined(SYS_linux_elf) static void segv_handler(int signo, struct sigcontext sc) { char * fault_addr = (char *) sc.cr2; #else static void segv_handler(int signo, siginfo_t * info, void * context) { char * fault_addr = (char *) info->si_addr; #endif struct rlimit limit; if (getrlimit(RLIMIT_STACK, &limit) == 0 && ((long) fault_addr & (sizeof(long) - 1)) == 0 && fault_addr < system_stack_top && fault_addr >= system_stack_top - limit.rlim_cur - 0x2000) { _exit(0); } else { _exit(4); } } void f(char * c); void g(char * c) { char d[1024]; f(d); } void f(char * c) { char d[1024]; g(d); } int main(int argc, char ** argv) { struct sigaltstack stk; struct sigaction act; struct rlimit limit; stk.ss_sp = sig_alt_stack; stk.ss_size = SIGSTKSZ; stk.ss_flags = 0; #if defined(TARGET_i386) && defined(SYS_linux_elf) act.sa_handler = (void (*)(int)) segv_handler; act.sa_flags = SA_ONSTACK | SA_NODEFER; #else act.sa_sigaction = segv_handler; act.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_NODEFER; #endif sigemptyset(&act.sa_mask); system_stack_top = (char *) &act; limit.rlim_max = limit.rlim_cur = 0x20000; if (sigaltstack(&stk, NULL) != 0) { perror("sigaltstack"); return 2; } if (sigaction(SIGSEGV, &act, NULL) != 0) { perror("sigaction"); return 2; } if (setrlimit(RLIMIT_STACK, &limit) != 0) { perror("setrlimit"); return 2; } f(NULL); return 2; } --X1bOJ3K7DJ5YkBrT-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message