linamh/sys-libs/glibc/files/2.5/glibc-2.5-gentoo-stack_chk_fail.c

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/* 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 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
# if !defined _KERNEL_NSIG && !defined _NSIG
# error No _NSIG or _KERNEL_NSIG for rt_sigaction
# endif
# if !defined __NR_sigation && !defined __NR_rt_sigaction
# error Cannot do syscall sigaction or rt_sigaction
# endif
#endif
/* Define DO_SOCKET/DO_CONNECT macros to deal with socketcall vs socket/connect */
#ifdef __NR_socketcall
# define DO_SOCKET(result,domain,type,protocol) \
{socketargs[0] = domain; \
socketargs[1] = type; \
socketargs[2] = protocol; \
socketargs[3] = 0; \
result = INLINE_SYSCALL(socketcall,2,SOCKOP_socket,socketargs);}
# define DO_CONNECT(result,sockfd,serv_addr,addrlen) \
{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
# define DO_SOCKET(result,domain,type,protocol) \
{result = INLINE_SYSCALL(socket,3,domain,type,protocol);}
# define DO_CONNECT(result,sockfd,serv_addr,addrlen) \
{result = INLINE_SYSCALL(connect,3,sockfd,serv_addr,addrlen);}
#endif
/* __NR_socketcall */
#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.
*/
static inline void
__attribute__ ((__noreturn__ , __always_inline__))
__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>";
#ifdef SSP_SMASH_DUMPS_CORE
static struct sigaction default_abort_act;
#endif
static int log_socket, connect_result;
static struct sockaddr_un sock;
#ifdef __NR_socketcall
static unsigned long int socketargs[4];
#endif
/* 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);
#ifdef SSP_SMASH_DUMPS_CORE
/* 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;
/* sigaction doesn't exist on amd64; however rt_sigaction seems to
* exist everywhere. rt_sigaction has an extra parameter - the
* size of sigset_t.
*/
# ifdef __NR_sigation
if (INLINE_SYSCALL(sigaction,3,SIGABRT,&default_abort_act,NULL) == 0)
# else
/* 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
if (INLINE_SYSCALL(rt_sigaction,4,SIGABRT,&default_abort_act,NULL,_KERNEL_NSIG/8) == 0)
# else
if (INLINE_SYSCALL(rt_sigaction,4,SIGABRT,&default_abort_act,NULL,_NSIG/8) == 0)
# endif
# endif
INLINE_SYSCALL(kill,2,pid,SIGABRT);
#endif
/* 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);
}
void
__attribute__ ((__noreturn__))
__stack_chk_fail (void)
{
__hardened_gentoo_stack_chk_fail(NULL,0);
}
#ifdef ENABLE_OLD_SSP_COMPAT
void
__attribute__ ((__noreturn__))
__stack_smash_handler(char func[], int damaged)
{
__hardened_gentoo_stack_chk_fail(func,damaged);
}
#endif