sys-libs/glibc/files/2.20/glibc-2.20-gentoo-chk_fail.c - chromiumos/overlays/chromiumos-overlay - Git at Google

 /* Copyright (C) 2004-2014 Free Software Foundation, Inc.
    Copyright (C) 2006-2014 Gentoo Foundation Inc.
    This file is part of the GNU C Library.

    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    The GNU C Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, write to the Free
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */

 /* Hardened Gentoo SSP and FORTIFY handler

    A failure handler that does not use functions from the rest of glibc;
    it uses the INTERNAL_SYSCALL methods directly.  This helps ensure no
    possibility of recursion into the handler.

    Direct all bug reports to http://bugs.gentoo.org/

    People who have contributed significantly to the evolution of this file:
    Ned Ludd - <solar[@]gentoo.org>
    Alexander Gabert - <pappy[@]gentoo.org>
    The PaX Team - <pageexec[@]freemail.hu>
    Peter S. Mazinger - <ps.m[@]gmx.net>
    Yoann Vandoorselaere - <yoann[@]prelude-ids.org>
    Robert Connolly - <robert[@]linuxfromscratch.org>
    Cory Visi <cory[@]visi.name>
    Mike Frysinger <vapier[@]gentoo.org>
    Magnus Granberg <zorry[@]gentoo.org>
    Kevin F. Quinn - <kevquinn[@]gentoo.org>
  */

 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <signal.h>

 #include <sys/types.h>

 #include <sysdep-cancel.h>
 #include <sys/syscall.h>

 #include <kernel-features.h>

 #include <alloca.h>
 /* from sysdeps */
 #include <socketcall.h>
 /* for the stuff in bits/socket.h */
 #include <sys/socket.h>
 #include <sys/un.h>

 /* Sanity check on SYSCALL macro names - force compilation
  * failure if the names used here do not exist
  */
 #if !defined __NR_socketcall && !defined __NR_socket
 # error Cannot do syscall socket or socketcall
 #endif
 #if !defined __NR_socketcall && !defined __NR_connect
 # error Cannot do syscall connect or socketcall
 #endif
 #ifndef __NR_write
 # error Cannot do syscall write
 #endif
 #ifndef __NR_close
 # error Cannot do syscall close
 #endif
 #ifndef __NR_getpid
 # error Cannot do syscall getpid
 #endif
 #ifndef __NR_kill
 # error Cannot do syscall kill
 #endif
 #ifndef __NR_exit
 # error Cannot do syscall exit
 #endif
 #ifdef SSP_SMASH_DUMPS_CORE
 # define ENABLE_SSP_SMASH_DUMPS_CORE 1
 # if !defined _KERNEL_NSIG && !defined _NSIG
 #  error No _NSIG or _KERNEL_NSIG for rt_sigaction
 # endif
 # if !defined __NR_sigaction && !defined __NR_rt_sigaction
 #  error Cannot do syscall sigaction or rt_sigaction
 # endif
 /* Although rt_sigaction expects sizeof(sigset_t) - it expects the size
  * of the _kernel_ sigset_t which is not the same as the user sigset_t.
  * Most arches have this as _NSIG bits - mips has _KERNEL_NSIG bits for
  * some reason.
  */
 # ifdef _KERNEL_NSIG
 #  define _SSP_NSIG _KERNEL_NSIG
 # else
 #  define _SSP_NSIG _NSIG
 # endif
 #else
 # define _SSP_NSIG 0
 # define ENABLE_SSP_SMASH_DUMPS_CORE 0
 #endif

 /* Define DO_SIGACTION - default to newer rt signal interface but
  * fallback to old as needed.
  */
 #ifdef __NR_rt_sigaction
 # define DO_SIGACTION(signum, act, oldact) \
 	INLINE_SYSCALL(rt_sigaction, 4, signum, act, oldact, _SSP_NSIG/8)
 #else
 # define DO_SIGACTION(signum, act, oldact) \
 	INLINE_SYSCALL(sigaction, 3, signum, act, oldact)
 #endif

 /* Define DO_SOCKET/DO_CONNECT functions to deal with socketcall vs socket/connect */
 #if defined(__NR_socket) && defined(__NR_connect)
 # define USE_OLD_SOCKETCALL 0
 #else
 # define USE_OLD_SOCKETCALL 1
 #endif

 /* stub out the __NR_'s so we can let gcc optimize away dead code */
 #ifndef __NR_socketcall
 # define __NR_socketcall 0
 #endif
 #ifndef __NR_socket
 # define __NR_socket 0
 #endif
 #ifndef __NR_connect
 # define __NR_connect 0
 #endif
 #define DO_SOCKET(result, domain, type, protocol) \
 	do { \
 		if (USE_OLD_SOCKETCALL) { \
 			socketargs[0] = domain; \
 			socketargs[1] = type; \
 			socketargs[2] = protocol; \
 			socketargs[3] = 0; \
 			result = INLINE_SYSCALL(socketcall, 2, SOCKOP_socket, socketargs); \
 		} else \
 			result = INLINE_SYSCALL(socket, 3, domain, type, protocol); \
 	} while (0)
 #define DO_CONNECT(result, sockfd, serv_addr, addrlen) \
 	do { \
 		if (USE_OLD_SOCKETCALL) { \
 			socketargs[0] = sockfd; \
 			socketargs[1] = (unsigned long int)serv_addr; \
 			socketargs[2] = addrlen; \
 			socketargs[3] = 0; \
 			result = INLINE_SYSCALL(socketcall, 2, SOCKOP_connect, socketargs); \
 		} else \
 			result = INLINE_SYSCALL(connect, 3, sockfd, serv_addr, addrlen); \
 	} while (0)

 #ifndef _PATH_LOG
 # define _PATH_LOG "/dev/log"
 #endif

 static const char path_log[] = _PATH_LOG;

 /* For building glibc with SSP switched on, define __progname to a
  * constant if building for the run-time loader, to avoid pulling
  * in more of libc.so into ld.so
  */
 #ifdef IS_IN_rtld
 static const char *__progname = "<ldso>";
 #else
 extern const char *__progname;
 #endif

 #ifdef GENTOO_SSP_HANDLER
 # define ERROR_MSG "stack smashing"
 #else
 # define ERROR_MSG "buffer overflow"
 #endif

 /* Common handler code, used by chk_fail
  * Inlined to ensure no self-references to the handler within itself.
  * Data static to avoid putting more than necessary on the stack,
  * to aid core debugging.
  */
 __attribute__ ((__noreturn__, __always_inline__))
 static inline void
 __hardened_gentoo_fail(void)
 {
 #define MESSAGE_BUFSIZ 512
 	static pid_t pid;
 	static int plen, i, hlen;
 	static char message[MESSAGE_BUFSIZ];
 	/* <11> is LOG_USER|LOG_ERR. A dummy date for loggers to skip over. */
 	static const char msg_header[] = "<11>" __DATE__ " " __TIME__ " glibc-gentoo-hardened-check: ";
 	static const char msg_ssd[] = "*** " ERROR_MSG " detected ***: ";
 	static const char msg_terminated[] = " terminated; ";
 	static const char msg_report[] = "report to " REPORT_BUGS_TO "\n";
 	static const char msg_unknown[] = "<unknown>";
 	static int log_socket, connect_result;
 	static struct sockaddr_un sock;
 	static unsigned long int socketargs[4];

 	/* Build socket address */
 	sock.sun_family = AF_UNIX;
 	i = 0;
 	while (path_log[i] != '\0' && i < sizeof(sock.sun_path) - 1) {
 		sock.sun_path[i] = path_log[i];
 		++i;
 	}
 	sock.sun_path[i] = '\0';

 	/* Try SOCK_DGRAM connection to syslog */
 	connect_result = -1;
 	DO_SOCKET(log_socket, AF_UNIX, SOCK_DGRAM, 0);
 	if (log_socket != -1)
 		DO_CONNECT(connect_result, log_socket, &sock, sizeof(sock));
 	if (connect_result == -1) {
 		if (log_socket != -1)
 			INLINE_SYSCALL(close, 1, log_socket);
 		/* Try SOCK_STREAM connection to syslog */
 		DO_SOCKET(log_socket, AF_UNIX, SOCK_STREAM, 0);
 		if (log_socket != -1)
 			DO_CONNECT(connect_result, log_socket, &sock, sizeof(sock));
 	}

 	/* Build message.  Messages are generated both in the old style and new style,
 	 * so that log watchers that are configured for the old-style message continue
 	 * to work.
 	 */
 #define strconcat(str) \
 	({ \
 		i = 0; \
 		while ((str[i] != '\0') && ((i + plen) < (MESSAGE_BUFSIZ - 1))) { \
 			message[plen + i] = str[i]; \
 			++i; \
 		} \
 		plen += i; \
 	})

 	/* Tersely log the failure */
 	plen = 0;
 	strconcat(msg_header);
 	hlen = plen;
 	strconcat(msg_ssd);
 	if (__progname != NULL)
 		strconcat(__progname);
 	else
 		strconcat(msg_unknown);
 	strconcat(msg_terminated);
 	strconcat(msg_report);

 	/* Write out error message to STDERR, to syslog if open */
 	INLINE_SYSCALL(write, 3, STDERR_FILENO, message + hlen, plen - hlen);
 	if (connect_result != -1) {
 		INLINE_SYSCALL(write, 3, log_socket, message, plen);
 		INLINE_SYSCALL(close, 1, log_socket);
 	}

 	/* Time to kill self since we have no idea what is going on */
 	pid = INLINE_SYSCALL(getpid, 0);

 	if (ENABLE_SSP_SMASH_DUMPS_CORE) {
 		/* Remove any user-supplied handler for SIGABRT, before using it. */
 #if 0
 		/*
 		 * Note: Disabled because some programs catch & process their
 		 * own crashes.  We've already enabled this code path which
 		 * means we want to let core dumps happen.
 		 */
 		static struct sigaction default_abort_act;
 		default_abort_act.sa_handler = SIG_DFL;
 		default_abort_act.sa_sigaction = NULL;
 		__sigfillset(&default_abort_act.sa_mask);
 		default_abort_act.sa_flags = 0;
 		if (DO_SIGACTION(SIGABRT, &default_abort_act, NULL) == 0)
 			INLINE_SYSCALL(kill, 2, pid, SIGABRT);
 #endif
 		/* Use abort() directly. http://crbug.com/406598 */
 		abort();
 	}

 	/* SIGKILL is only signal which cannot be caught */
 	INLINE_SYSCALL(kill, 2, pid, SIGKILL);

 	/* In case the kill didn't work, exit anyway.
 	 * The loop prevents gcc thinking this routine returns.
 	 */
 	while (1)
 		INLINE_SYSCALL(exit, 1, 137);
 }

 __attribute__ ((__noreturn__))
 #ifdef GENTOO_SSP_HANDLER
 void __stack_chk_fail(void)
 #else
 void __chk_fail(void)
 #endif
 {
 	__hardened_gentoo_fail();
 }
	/* Copyright (C) 2004-2014 Free Software Foundation, Inc.
	Copyright (C) 2006-2014 Gentoo Foundation Inc.
	This file is part of the GNU C Library.

	The GNU C Library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.

	The GNU C Library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with the GNU C Library; if not, write to the Free
	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	02111-1307 USA. */

	/* Hardened Gentoo SSP and FORTIFY handler

	A failure handler that does not use functions from the rest of glibc;
	it uses the INTERNAL_SYSCALL methods directly. This helps ensure no
	possibility of recursion into the handler.

	Direct all bug reports to http://bugs.gentoo.org/

	People who have contributed significantly to the evolution of this file:
	Ned Ludd - <solar[@]gentoo.org>
	Alexander Gabert - <pappy[@]gentoo.org>
	The PaX Team - <pageexec[@]freemail.hu>
	Peter S. Mazinger - <ps.m[@]gmx.net>
	Yoann Vandoorselaere - <yoann[@]prelude-ids.org>
	Robert Connolly - <robert[@]linuxfromscratch.org>
	Cory Visi <cory[@]visi.name>
	Mike Frysinger <vapier[@]gentoo.org>
	Magnus Granberg <zorry[@]gentoo.org>
	Kevin F. Quinn - <kevquinn[@]gentoo.org>
	*/

	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <signal.h>

	#include <sys/types.h>

	#include <sysdep-cancel.h>
	#include <sys/syscall.h>

	#include <kernel-features.h>

	#include <alloca.h>
	/* from sysdeps */
	#include <socketcall.h>
	/* for the stuff in bits/socket.h */
	#include <sys/socket.h>
	#include <sys/un.h>

	/* Sanity check on SYSCALL macro names - force compilation
	* failure if the names used here do not exist
	*/
	#if !defined __NR_socketcall && !defined __NR_socket
	# error Cannot do syscall socket or socketcall
	#endif
	#if !defined __NR_socketcall && !defined __NR_connect
	# error Cannot do syscall connect or socketcall
	#endif
	#ifndef __NR_write
	# error Cannot do syscall write
	#endif
	#ifndef __NR_close
	# error Cannot do syscall close
	#endif
	#ifndef __NR_getpid
	# error Cannot do syscall getpid
	#endif
	#ifndef __NR_kill
	# error Cannot do syscall kill
	#endif
	#ifndef __NR_exit
	# error Cannot do syscall exit
	#endif
	#ifdef SSP_SMASH_DUMPS_CORE
	# define ENABLE_SSP_SMASH_DUMPS_CORE 1
	# if !defined _KERNEL_NSIG && !defined _NSIG
	# error No _NSIG or _KERNEL_NSIG for rt_sigaction
	# endif
	# if !defined __NR_sigaction && !defined __NR_rt_sigaction
	# error Cannot do syscall sigaction or rt_sigaction
	# endif
	/* Although rt_sigaction expects sizeof(sigset_t) - it expects the size
	* of the _kernel_ sigset_t which is not the same as the user sigset_t.
	* Most arches have this as _NSIG bits - mips has _KERNEL_NSIG bits for
	* some reason.
	*/
	# ifdef _KERNEL_NSIG
	# define _SSP_NSIG _KERNEL_NSIG
	# else
	# define _SSP_NSIG _NSIG
	# endif
	#else
	# define _SSP_NSIG 0
	# define ENABLE_SSP_SMASH_DUMPS_CORE 0
	#endif

	/* Define DO_SIGACTION - default to newer rt signal interface but
	* fallback to old as needed.
	*/
	#ifdef __NR_rt_sigaction
	# define DO_SIGACTION(signum, act, oldact) \
	INLINE_SYSCALL(rt_sigaction, 4, signum, act, oldact, _SSP_NSIG/8)
	#else
	# define DO_SIGACTION(signum, act, oldact) \
	INLINE_SYSCALL(sigaction, 3, signum, act, oldact)
	#endif

	/* Define DO_SOCKET/DO_CONNECT functions to deal with socketcall vs socket/connect */
	#if defined(__NR_socket) && defined(__NR_connect)
	# define USE_OLD_SOCKETCALL 0
	#else
	# define USE_OLD_SOCKETCALL 1
	#endif

	/* stub out the __NR_'s so we can let gcc optimize away dead code */
	#ifndef __NR_socketcall
	# define __NR_socketcall 0
	#endif
	#ifndef __NR_socket
	# define __NR_socket 0
	#endif
	#ifndef __NR_connect
	# define __NR_connect 0
	#endif
	#define DO_SOCKET(result, domain, type, protocol) \
	do { \
	if (USE_OLD_SOCKETCALL) { \
	socketargs[0] = domain; \
	socketargs[1] = type; \
	socketargs[2] = protocol; \
	socketargs[3] = 0; \
	result = INLINE_SYSCALL(socketcall, 2, SOCKOP_socket, socketargs); \
	} else \
	result = INLINE_SYSCALL(socket, 3, domain, type, protocol); \
	} while (0)
	#define DO_CONNECT(result, sockfd, serv_addr, addrlen) \
	do { \
	if (USE_OLD_SOCKETCALL) { \
	socketargs[0] = sockfd; \
	socketargs[1] = (unsigned long int)serv_addr; \
	socketargs[2] = addrlen; \
	socketargs[3] = 0; \
	result = INLINE_SYSCALL(socketcall, 2, SOCKOP_connect, socketargs); \
	} else \
	result = INLINE_SYSCALL(connect, 3, sockfd, serv_addr, addrlen); \
	} while (0)

	#ifndef _PATH_LOG
	# define _PATH_LOG "/dev/log"
	#endif

	static const char path_log[] = _PATH_LOG;

	/* For building glibc with SSP switched on, define __progname to a
	* constant if building for the run-time loader, to avoid pulling
	* in more of libc.so into ld.so
	*/
	#ifdef IS_IN_rtld
	static const char *__progname = "<ldso>";
	#else
	extern const char *__progname;
	#endif

	#ifdef GENTOO_SSP_HANDLER
	# define ERROR_MSG "stack smashing"
	#else
	# define ERROR_MSG "buffer overflow"
	#endif

	/* Common handler code, used by chk_fail
	* Inlined to ensure no self-references to the handler within itself.
	* Data static to avoid putting more than necessary on the stack,
	* to aid core debugging.
	*/
	__attribute__ ((__noreturn__, __always_inline__))
	static inline void
	__hardened_gentoo_fail(void)
	{
	#define MESSAGE_BUFSIZ 512
	static pid_t pid;
	static int plen, i, hlen;
	static char message[MESSAGE_BUFSIZ];
	/* <11> is LOG_USER\|LOG_ERR. A dummy date for loggers to skip over. */
	static const char msg_header[] = "<11>" __DATE__ " " __TIME__ " glibc-gentoo-hardened-check: ";
	static const char msg_ssd[] = "* " ERROR_MSG " detected *: ";
	static const char msg_terminated[] = " terminated; ";
	static const char msg_report[] = "report to " REPORT_BUGS_TO "\n";
	static const char msg_unknown[] = "<unknown>";
	static int log_socket, connect_result;
	static struct sockaddr_un sock;
	static unsigned long int socketargs[4];

	/* Build socket address */
	sock.sun_family = AF_UNIX;
	i = 0;
	while (path_log[i] != '\0' && i < sizeof(sock.sun_path) - 1) {
	sock.sun_path[i] = path_log[i];
	++i;
	}
	sock.sun_path[i] = '\0';

	/* Try SOCK_DGRAM connection to syslog */
	connect_result = -1;
	DO_SOCKET(log_socket, AF_UNIX, SOCK_DGRAM, 0);
	if (log_socket != -1)
	DO_CONNECT(connect_result, log_socket, &sock, sizeof(sock));
	if (connect_result == -1) {
	if (log_socket != -1)
	INLINE_SYSCALL(close, 1, log_socket);
	/* Try SOCK_STREAM connection to syslog */
	DO_SOCKET(log_socket, AF_UNIX, SOCK_STREAM, 0);
	if (log_socket != -1)
	DO_CONNECT(connect_result, log_socket, &sock, sizeof(sock));
	}

	/* Build message. Messages are generated both in the old style and new style,
	* so that log watchers that are configured for the old-style message continue
	* to work.
	*/
	#define strconcat(str) \
	({ \
	i = 0; \
	while ((str[i] != '\0') && ((i + plen) < (MESSAGE_BUFSIZ - 1))) { \
	message[plen + i] = str[i]; \
	++i; \
	} \
	plen += i; \
	})

	/* Tersely log the failure */
	plen = 0;
	strconcat(msg_header);
	hlen = plen;
	strconcat(msg_ssd);
	if (__progname != NULL)
	strconcat(__progname);
	else
	strconcat(msg_unknown);
	strconcat(msg_terminated);
	strconcat(msg_report);

	/* Write out error message to STDERR, to syslog if open */
	INLINE_SYSCALL(write, 3, STDERR_FILENO, message + hlen, plen - hlen);
	if (connect_result != -1) {
	INLINE_SYSCALL(write, 3, log_socket, message, plen);
	INLINE_SYSCALL(close, 1, log_socket);
	}

	/* Time to kill self since we have no idea what is going on */
	pid = INLINE_SYSCALL(getpid, 0);

	if (ENABLE_SSP_SMASH_DUMPS_CORE) {
	/* Remove any user-supplied handler for SIGABRT, before using it. */
	#if 0
	/*
	* Note: Disabled because some programs catch & process their
	* own crashes. We've already enabled this code path which
	* means we want to let core dumps happen.
	*/
	static struct sigaction default_abort_act;
	default_abort_act.sa_handler = SIG_DFL;
	default_abort_act.sa_sigaction = NULL;
	__sigfillset(&default_abort_act.sa_mask);
	default_abort_act.sa_flags = 0;
	if (DO_SIGACTION(SIGABRT, &default_abort_act, NULL) == 0)
	INLINE_SYSCALL(kill, 2, pid, SIGABRT);
	#endif
	/* Use abort() directly. http://crbug.com/406598 */
	abort();
	}

	/* SIGKILL is only signal which cannot be caught */
	INLINE_SYSCALL(kill, 2, pid, SIGKILL);

	/* In case the kill didn't work, exit anyway.
	* The loop prevents gcc thinking this routine returns.
	*/
	while (1)
	INLINE_SYSCALL(exit, 1, 137);
	}

	__attribute__ ((__noreturn__))
	#ifdef GENTOO_SSP_HANDLER
	void __stack_chk_fail(void)
	#else
	void __chk_fail(void)
	#endif
	{
	__hardened_gentoo_fail();
	}