mirror of
https://github.com/DrBeef/Raze.git
synced 2024-11-15 17:01:51 +00:00
425 lines
9.4 KiB
C
425 lines
9.4 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/param.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#ifdef __linux__
|
|
#include <sys/prctl.h>
|
|
#ifndef PR_SET_PTRACER
|
|
#define PR_SET_PTRACER 0x59616d61
|
|
#endif
|
|
#elif defined (__APPLE__) || defined (__FreeBSD__) || defined(__OpenBSD__)
|
|
#include <signal.h>
|
|
#endif
|
|
|
|
|
|
static const char crash_switch[] = "--cc-handle-crash";
|
|
|
|
static const char fatal_err[] = "\n\n*** Fatal Error ***\n";
|
|
static const char pipe_err[] = "!!! Failed to create pipe\n";
|
|
static const char fork_err[] = "!!! Failed to fork debug process\n";
|
|
static const char exec_err[] = "!!! Failed to exec debug process\n";
|
|
|
|
static char argv0[PATH_MAX];
|
|
|
|
static char altstack[SIGSTKSZ];
|
|
|
|
|
|
static struct {
|
|
int signum;
|
|
pid_t pid;
|
|
int has_siginfo;
|
|
siginfo_t siginfo;
|
|
char buf[4096];
|
|
} crash_info;
|
|
|
|
|
|
static const struct {
|
|
const char *name;
|
|
int signum;
|
|
} signals[] = {
|
|
{ "Segmentation fault", SIGSEGV },
|
|
{ "Illegal instruction", SIGILL },
|
|
{ "FPU exception", SIGFPE },
|
|
{ "System BUS error", SIGBUS },
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
static const struct {
|
|
int code;
|
|
const char *name;
|
|
} sigill_codes[] = {
|
|
#ifndef __FreeBSD__
|
|
{ ILL_ILLOPC, "Illegal opcode" },
|
|
{ ILL_ILLOPN, "Illegal operand" },
|
|
{ ILL_ILLADR, "Illegal addressing mode" },
|
|
{ ILL_ILLTRP, "Illegal trap" },
|
|
{ ILL_PRVOPC, "Privileged opcode" },
|
|
{ ILL_PRVREG, "Privileged register" },
|
|
{ ILL_COPROC, "Coprocessor error" },
|
|
{ ILL_BADSTK, "Internal stack error" },
|
|
#endif
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const struct {
|
|
int code;
|
|
const char *name;
|
|
} sigfpe_codes[] = {
|
|
{ FPE_INTDIV, "Integer divide by zero" },
|
|
{ FPE_INTOVF, "Integer overflow" },
|
|
{ FPE_FLTDIV, "Floating point divide by zero" },
|
|
{ FPE_FLTOVF, "Floating point overflow" },
|
|
{ FPE_FLTUND, "Floating point underflow" },
|
|
{ FPE_FLTRES, "Floating point inexact result" },
|
|
{ FPE_FLTINV, "Floating point invalid operation" },
|
|
{ FPE_FLTSUB, "Subscript out of range" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const struct {
|
|
int code;
|
|
const char *name;
|
|
} sigsegv_codes[] = {
|
|
#ifndef __FreeBSD__
|
|
{ SEGV_MAPERR, "Address not mapped to object" },
|
|
{ SEGV_ACCERR, "Invalid permissions for mapped object" },
|
|
#endif
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const struct {
|
|
int code;
|
|
const char *name;
|
|
} sigbus_codes[] = {
|
|
#ifndef __FreeBSD__
|
|
{ BUS_ADRALN, "Invalid address alignment" },
|
|
{ BUS_ADRERR, "Non-existent physical address" },
|
|
{ BUS_OBJERR, "Object specific hardware error" },
|
|
#endif
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static int (*cc_user_info)(char*, char*);
|
|
|
|
|
|
static void gdb_info(pid_t pid)
|
|
{
|
|
char respfile[64];
|
|
char cmd_buf[128];
|
|
FILE *f;
|
|
int fd;
|
|
|
|
/* Create a temp file to put gdb commands into */
|
|
strcpy(respfile, "gdb-respfile-XXXXXX");
|
|
if((fd=mkstemp(respfile)) >= 0 && (f=fdopen(fd, "w")) != NULL)
|
|
{
|
|
fprintf(f, "attach %d\n"
|
|
"shell echo \"\"\n"
|
|
"shell echo \"* Loaded Libraries\"\n"
|
|
"info sharedlibrary\n"
|
|
"shell echo \"\"\n"
|
|
"shell echo \"* Threads\"\n"
|
|
"info threads\n"
|
|
"shell echo \"\"\n"
|
|
"shell echo \"* FPU Status\"\n"
|
|
"info float\n"
|
|
"shell echo \"\"\n"
|
|
"shell echo \"* Registers\"\n"
|
|
"info registers\n"
|
|
"shell echo \"\"\n"
|
|
"shell echo \"* Backtrace\"\n"
|
|
"thread apply all backtrace full\n"
|
|
"detach\n"
|
|
"quit\n", pid);
|
|
fclose(f);
|
|
|
|
/* Run gdb and print process info. */
|
|
snprintf(cmd_buf, sizeof(cmd_buf), "gdb --quiet --batch --command=%s", respfile);
|
|
printf("Executing: %s\n", cmd_buf);
|
|
fflush(stdout);
|
|
|
|
system(cmd_buf);
|
|
/* Clean up */
|
|
remove(respfile);
|
|
}
|
|
else
|
|
{
|
|
/* Error creating temp file */
|
|
if(fd >= 0)
|
|
{
|
|
close(fd);
|
|
remove(respfile);
|
|
}
|
|
printf("!!! Could not create gdb command file\n");
|
|
}
|
|
fflush(stdout);
|
|
}
|
|
|
|
static void sys_info(void)
|
|
{
|
|
#ifdef __unix__
|
|
system("echo \"System: `uname -a`\"");
|
|
putchar('\n');
|
|
fflush(stdout);
|
|
#endif
|
|
}
|
|
|
|
|
|
static size_t safe_write(int fd, const void *buf, size_t len)
|
|
{
|
|
size_t ret = 0;
|
|
while(ret < len)
|
|
{
|
|
ssize_t rem;
|
|
if((rem=write(fd, (const char*)buf+ret, len-ret)) == -1)
|
|
{
|
|
if(errno == EINTR)
|
|
continue;
|
|
break;
|
|
}
|
|
ret += rem;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void crash_catcher(int signum, siginfo_t *siginfo, void *context)
|
|
{
|
|
//ucontext_t *ucontext = (ucontext_t*)context;
|
|
pid_t dbg_pid;
|
|
int fd[2];
|
|
|
|
/* Make sure the effective uid is the real uid */
|
|
if(getuid() != geteuid())
|
|
{
|
|
raise(signum);
|
|
return;
|
|
}
|
|
|
|
safe_write(STDERR_FILENO, fatal_err, sizeof(fatal_err)-1);
|
|
if(pipe(fd) == -1)
|
|
{
|
|
safe_write(STDERR_FILENO, pipe_err, sizeof(pipe_err)-1);
|
|
raise(signum);
|
|
return;
|
|
}
|
|
|
|
crash_info.signum = signum;
|
|
crash_info.pid = getpid();
|
|
crash_info.has_siginfo = !!siginfo;
|
|
if(siginfo)
|
|
crash_info.siginfo = *siginfo;
|
|
if(cc_user_info)
|
|
cc_user_info(crash_info.buf, crash_info.buf+sizeof(crash_info.buf));
|
|
|
|
/* Fork off to start a crash handler */
|
|
switch((dbg_pid=fork()))
|
|
{
|
|
/* Error */
|
|
case -1:
|
|
safe_write(STDERR_FILENO, fork_err, sizeof(fork_err)-1);
|
|
raise(signum);
|
|
return;
|
|
|
|
case 0:
|
|
dup2(fd[0], STDIN_FILENO);
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
|
|
execl(argv0, argv0, crash_switch, NULL);
|
|
|
|
safe_write(STDERR_FILENO, exec_err, sizeof(exec_err)-1);
|
|
_exit(1);
|
|
|
|
default:
|
|
#ifdef __linux__
|
|
prctl(PR_SET_PTRACER, dbg_pid, 0, 0, 0);
|
|
#endif
|
|
safe_write(fd[1], &crash_info, sizeof(crash_info));
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
|
|
/* Wait; we'll be killed when gdb is done */
|
|
do {
|
|
int status;
|
|
if(waitpid(dbg_pid, &status, 0) == dbg_pid &&
|
|
(WIFEXITED(status) || WIFSIGNALED(status)))
|
|
{
|
|
/* The debug process died before it could kill us */
|
|
raise(signum);
|
|
break;
|
|
}
|
|
} while(1);
|
|
}
|
|
}
|
|
|
|
static void crash_handler(const char *logfile)
|
|
{
|
|
const char *sigdesc = "";
|
|
int i;
|
|
|
|
if(fread(&crash_info, sizeof(crash_info), 1, stdin) != 1)
|
|
{
|
|
fprintf(stderr, "!!! Failed to retrieve info from crashed process\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* Get the signal description */
|
|
for(i = 0;signals[i].name;++i)
|
|
{
|
|
if(signals[i].signum == crash_info.signum)
|
|
{
|
|
sigdesc = signals[i].name;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(crash_info.has_siginfo)
|
|
{
|
|
switch(crash_info.signum)
|
|
{
|
|
case SIGSEGV:
|
|
for(i = 0;sigsegv_codes[i].name;++i)
|
|
{
|
|
if(sigsegv_codes[i].code == crash_info.siginfo.si_code)
|
|
{
|
|
sigdesc = sigsegv_codes[i].name;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SIGFPE:
|
|
for(i = 0;sigfpe_codes[i].name;++i)
|
|
{
|
|
if(sigfpe_codes[i].code == crash_info.siginfo.si_code)
|
|
{
|
|
sigdesc = sigfpe_codes[i].name;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SIGILL:
|
|
for(i = 0;sigill_codes[i].name;++i)
|
|
{
|
|
if(sigill_codes[i].code == crash_info.siginfo.si_code)
|
|
{
|
|
sigdesc = sigill_codes[i].name;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SIGBUS:
|
|
for(i = 0;sigbus_codes[i].name;++i)
|
|
{
|
|
if(sigbus_codes[i].code == crash_info.siginfo.si_code)
|
|
{
|
|
sigdesc = sigbus_codes[i].name;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
fprintf(stderr, "%s (signal %i)\n", sigdesc, crash_info.signum);
|
|
if(crash_info.has_siginfo)
|
|
fprintf(stderr, "Address: %p\n", crash_info.siginfo.si_addr);
|
|
fputc('\n', stderr);
|
|
|
|
if(logfile)
|
|
{
|
|
/* Create crash log file and redirect shell output to it */
|
|
if(freopen(logfile, "wa", stdout) != stdout)
|
|
{
|
|
fprintf(stderr, "!!! Could not create %s following signal\n", logfile);
|
|
exit(1);
|
|
}
|
|
fprintf(stderr, "Generating %s and killing process %d, please wait... ", logfile, crash_info.pid);
|
|
|
|
printf("*** Fatal Error ***\n"
|
|
"%s (signal %i)\n", sigdesc, crash_info.signum);
|
|
if(crash_info.has_siginfo)
|
|
printf("Address: %p\n", crash_info.siginfo.si_addr);
|
|
fputc('\n', stdout);
|
|
fflush(stdout);
|
|
}
|
|
|
|
sys_info();
|
|
|
|
crash_info.buf[sizeof(crash_info.buf)-1] = '\0';
|
|
printf("%s\n", crash_info.buf);
|
|
fflush(stdout);
|
|
|
|
if(crash_info.pid > 0)
|
|
{
|
|
gdb_info(crash_info.pid);
|
|
kill(crash_info.pid, SIGKILL);
|
|
}
|
|
|
|
if(logfile)
|
|
{
|
|
const char *str;
|
|
char buf[512];
|
|
|
|
if((str=getenv("KDE_FULL_SESSION")) && strcmp(str, "true") == 0)
|
|
snprintf(buf, sizeof(buf), "kdialog --title \"Very Fatal Error\" --textbox \"%s\" 800 600", logfile);
|
|
else if((str=getenv("GNOME_DESKTOP_SESSION_ID")) && str[0] != '\0')
|
|
snprintf(buf, sizeof(buf), "gxmessage -buttons \"Okay:0\" -geometry 800x600 -title \"Very Fatal Error\" -center -file \"%s\"", logfile);
|
|
else
|
|
snprintf(buf, sizeof(buf), "xmessage -buttons \"Okay:0\" -center -file \"%s\"", logfile);
|
|
|
|
system(buf);
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
int cc_install_handlers(int argc, char **argv, int num_signals, int *signals, const char *logfile, int (*user_info)(char*, char*))
|
|
{
|
|
struct sigaction sa;
|
|
stack_t altss;
|
|
int retval;
|
|
|
|
if(argc == 2 && strcmp(argv[1], crash_switch) == 0)
|
|
crash_handler(logfile);
|
|
|
|
cc_user_info = user_info;
|
|
|
|
if(argv[0][0] == '/')
|
|
snprintf(argv0, sizeof(argv0), "%s", argv[0]);
|
|
else
|
|
{
|
|
getcwd(argv0, sizeof(argv0));
|
|
retval = strlen(argv0);
|
|
snprintf(argv0+retval, sizeof(argv0)-retval, "/%s", argv[0]);
|
|
}
|
|
|
|
/* Set an alternate signal stack so SIGSEGVs caused by stack overflows
|
|
* still run */
|
|
altss.ss_sp = altstack;
|
|
altss.ss_flags = 0;
|
|
altss.ss_size = sizeof(altstack);
|
|
sigaltstack(&altss, NULL);
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa_sigaction = crash_catcher;
|
|
sa.sa_flags = SA_RESETHAND | SA_NODEFER | SA_SIGINFO | SA_ONSTACK;
|
|
sigemptyset(&sa.sa_mask);
|
|
|
|
retval = 0;
|
|
while(num_signals--)
|
|
{
|
|
if((*signals != SIGSEGV && *signals != SIGILL && *signals != SIGFPE &&
|
|
*signals != SIGBUS) || sigaction(*signals, &sa, NULL) == -1)
|
|
{
|
|
*signals = 0;
|
|
retval = -1;
|
|
}
|
|
++signals;
|
|
}
|
|
return retval;
|
|
}
|