--- /dev/null
+/* Copyright (C) 2005 Free Software 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. */
+
+/* Copyright (C) 2006-2007 Gentoo Foundation Inc.
+ * License terms as above.
+ *
+ * Hardened Gentoo SSP handler
+ *
+ * An SSP failure handler that does not use functions from the rest of
+ * glibc; it uses the INTERNAL_SYSCALL methods directly. This ensures
+ * no possibility of recursion into the handler.
+ *
+ * Direct all bug reports to http://bugs.gentoo.org/
+ *
+ * Re-written from the glibc-2.3 Hardened Gentoo SSP handler
+ * by Kevin F. Quinn - <kevquinn[@]gentoo.org>
+ *
+ * The following people contributed to the glibc-2.3 Hardened
+ * Gentoo SSP handler, from which this implementation draws much:
+ *
+ * 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>
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <sys/types.h>
+
+#include <sysdep-cancel.h>
+#include <sys/syscall.h>
+#include <bp-checks.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 char *__progname = "<rtld>";
+#else
+extern char *__progname;
+#endif
+
+
+/* Common handler code, used by stack_chk_fail and __stack_smash_handler
+ * 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_stack_chk_fail(char func[], int damaged)
+{
+#define MESSAGE_BUFSIZ 256
+ static pid_t pid;
+ static int plen, i;
+ static char message[MESSAGE_BUFSIZ];
+ static const char msg_ssa[] = ": stack smashing attack";
+ static const char msg_inf[] = " in function ";
+ static const char msg_ssd[] = "*** stack smashing detected ***: ";
+ static const char msg_terminated[] = " - terminated\n";
+ static const char msg_report[] = "Report to http://bugs.gentoo.org/\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;}
+
+ /* R.Henderson post-gcc-4 style message */
+ plen = 0;
+ strconcat(msg_ssd);
+ if (__progname != (char *)0)
+ strconcat(__progname)
+ else
+ strconcat(msg_unknown);
+ strconcat(msg_terminated);
+
+ /* Write out error message to STDERR, to syslog if open */
+ INLINE_SYSCALL(write, 3, STDERR_FILENO, message, plen);
+ if (connect_result != -1)
+ INLINE_SYSCALL(write, 3, log_socket, message, plen);
+
+ /* Dr. Etoh pre-gcc-4 style message */
+ plen = 0;
+ if (__progname != (char *)0)
+ strconcat(__progname)
+ else
+ strconcat(msg_unknown);
+ strconcat(msg_ssa);
+ strconcat(msg_inf);
+ if (func != NULL)
+ strconcat(func)
+ else
+ strconcat(msg_unknown);
+ strconcat(msg_terminated);
+ /* Write out error message to STDERR, to syslog if open */
+ INLINE_SYSCALL(write, 3, STDERR_FILENO, message, plen);
+ if (connect_result != -1)
+ INLINE_SYSCALL(write, 3, log_socket, message, plen);
+
+ /* Direct reports to bugs.gentoo.org */
+ plen=0;
+ strconcat(msg_report);
+ message[plen++]='\0';
+
+ /* Write out error message to STDERR, to syslog if open */
+ INLINE_SYSCALL(write, 3, STDERR_FILENO, message, plen);
+ if (connect_result != -1)
+ INLINE_SYSCALL(write, 3, log_socket, message, plen);
+
+ if (log_socket != -1)
+ INLINE_SYSCALL(close, 1, log_socket);
+
+ /* Suicide */
+ pid = INLINE_SYSCALL(getpid, 0);
+
+ if (ENABLE_SSP_SMASH_DUMPS_CORE) {
+ static struct sigaction default_abort_act;
+ /* Remove any user-supplied handler for SIGABRT, before using it */
+ 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);
+ }
+
+ /* Note; actions cannot be added to SIGKILL */
+ 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, 0);
+}
+
+__attribute__ ((__noreturn__))
+void __stack_chk_fail(void)
+{
+ __hardened_gentoo_stack_chk_fail(NULL, 0);
+}
+
+#ifdef ENABLE_OLD_SSP_COMPAT
+__attribute__ ((__noreturn__))
+void __stack_smash_handler(char func[], int damaged)
+{
+ __hardened_gentoo_stack_chk_fail(func, damaged);
+}
+#endif
projects / ipfire-3.x.git / commitdiff
