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523 lines
14 KiB
C++
523 lines
14 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/param.h>
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#include <sys/utsname.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <sys/ptrace.h>
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#include <iostream>
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#include <boost/filesystem/fstream.hpp>
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namespace bfs = boost::filesystem;
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#include <SDL_messagebox.h>
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#ifdef __linux__
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#include <sys/prctl.h>
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#include <sys/ucontext.h>
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#ifndef PR_SET_PTRACER
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#define PR_SET_PTRACER 0x59616d61
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#endif
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#elif defined (__APPLE__) || defined (__FreeBSD__) || defined(__OpenBSD__)
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#include <signal.h>
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#endif
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#if defined(__APPLE__)
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#include <sys/sysctl.h>
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#endif
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#define UNUSED(x) (void)(x)
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static const char crash_switch[] = "--cc-handle-crash";
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static const char fatal_err[] = "\n\n*** Fatal Error ***\n";
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static const char pipe_err[] = "!!! Failed to create pipe\n";
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static const char fork_err[] = "!!! Failed to fork debug process\n";
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static const char exec_err[] = "!!! Failed to exec debug process\n";
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#ifndef PATH_MAX /* Not all platforms (GNU Hurd) have this. */
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# define PATH_MAX 256
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#endif
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static char argv0[PATH_MAX];
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static char altstack[SIGSTKSZ];
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static struct {
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int signum;
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pid_t pid;
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int has_siginfo;
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siginfo_t siginfo;
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char buf[1024];
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} crash_info;
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static const struct {
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const char *name;
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int signum;
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} signals[] = {
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{ "Segmentation fault", SIGSEGV },
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{ "Illegal instruction", SIGILL },
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{ "FPU exception", SIGFPE },
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{ "System BUS error", SIGBUS },
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{ NULL, 0 }
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};
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static const struct {
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int code;
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const char *name;
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} sigill_codes[] = {
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#if !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__)
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{ ILL_ILLOPC, "Illegal opcode" },
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{ ILL_ILLOPN, "Illegal operand" },
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{ ILL_ILLADR, "Illegal addressing mode" },
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{ ILL_ILLTRP, "Illegal trap" },
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{ ILL_PRVOPC, "Privileged opcode" },
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{ ILL_PRVREG, "Privileged register" },
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{ ILL_COPROC, "Coprocessor error" },
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{ ILL_BADSTK, "Internal stack error" },
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#endif
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{ 0, NULL }
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};
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static const struct {
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int code;
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const char *name;
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} sigfpe_codes[] = {
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{ FPE_INTDIV, "Integer divide by zero" },
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{ FPE_INTOVF, "Integer overflow" },
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{ FPE_FLTDIV, "Floating point divide by zero" },
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{ FPE_FLTOVF, "Floating point overflow" },
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{ FPE_FLTUND, "Floating point underflow" },
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{ FPE_FLTRES, "Floating point inexact result" },
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{ FPE_FLTINV, "Floating point invalid operation" },
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{ FPE_FLTSUB, "Subscript out of range" },
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{ 0, NULL }
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};
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static const struct {
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int code;
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const char *name;
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} sigsegv_codes[] = {
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#ifndef __FreeBSD__
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{ SEGV_MAPERR, "Address not mapped to object" },
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{ SEGV_ACCERR, "Invalid permissions for mapped object" },
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#endif
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{ 0, NULL }
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};
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static const struct {
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int code;
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const char *name;
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} sigbus_codes[] = {
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#ifndef __FreeBSD__
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{ BUS_ADRALN, "Invalid address alignment" },
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{ BUS_ADRERR, "Non-existent physical address" },
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{ BUS_OBJERR, "Object specific hardware error" },
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#endif
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{ 0, NULL }
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};
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static int (*cc_user_info)(char*, char*);
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static void gdb_info(pid_t pid)
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{
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char respfile[64];
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FILE *f;
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int fd;
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/* Create a temp file to put gdb commands into */
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strcpy(respfile, "/tmp/gdb-respfile-XXXXXX");
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if((fd=mkstemp(respfile)) >= 0 && (f=fdopen(fd, "w")) != NULL)
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{
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fprintf(f, "attach %d\n"
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"shell echo \"\"\n"
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"shell echo \"* Loaded Libraries\"\n"
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"info sharedlibrary\n"
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"shell echo \"\"\n"
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"shell echo \"* Threads\"\n"
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"info threads\n"
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"shell echo \"\"\n"
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"shell echo \"* FPU Status\"\n"
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"info float\n"
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"shell echo \"\"\n"
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"shell echo \"* Registers\"\n"
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"info registers\n"
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"shell echo \"\"\n"
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"shell echo \"* Backtrace\"\n"
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"thread apply all backtrace full 1000\n"
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"detach\n"
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"quit\n", pid);
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fclose(f);
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/* Run gdb and print process info. */
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char cmd_buf[128];
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snprintf(cmd_buf, sizeof(cmd_buf), "gdb --quiet --batch --command=%s", respfile);
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printf("Executing: %s\n", cmd_buf);
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fflush(stdout);
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int ret = system(cmd_buf);
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if (ret != 0)
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printf("\nFailed to create a crash report. Please install 'gdb' and crash again!\n");
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fflush(stdout);
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/* Clean up */
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remove(respfile);
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}
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else
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{
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/* Error creating temp file */
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if(fd >= 0)
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{
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close(fd);
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remove(respfile);
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}
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printf("!!! Could not create gdb command file\n");
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}
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fflush(stdout);
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}
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static void sys_info(void)
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{
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#ifdef __unix__
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struct utsname info;
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if(uname(&info))
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printf("!!! Failed to get system information\n");
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else
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printf("System: %s %s %s %s %s\n",
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info.sysname, info.nodename, info.release, info.version, info.machine);
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fflush(stdout);
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#endif
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}
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static size_t safe_write(int fd, const void *buf, size_t len)
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{
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size_t ret = 0;
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while(ret < len)
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{
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ssize_t rem;
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if((rem=write(fd, (const char*)buf+ret, len-ret)) == -1)
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{
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if(errno == EINTR)
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continue;
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break;
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}
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ret += rem;
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}
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return ret;
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}
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static void crash_catcher(int signum, siginfo_t *siginfo, void *context)
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{
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//ucontext_t *ucontext = (ucontext_t*)context;
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pid_t dbg_pid;
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int fd[2];
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/* Make sure the effective uid is the real uid */
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if(getuid() != geteuid())
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{
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raise(signum);
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return;
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}
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safe_write(STDERR_FILENO, fatal_err, sizeof(fatal_err)-1);
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if(pipe(fd) == -1)
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{
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safe_write(STDERR_FILENO, pipe_err, sizeof(pipe_err)-1);
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raise(signum);
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return;
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}
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crash_info.signum = signum;
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crash_info.pid = getpid();
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crash_info.has_siginfo = !!siginfo;
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if(siginfo)
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crash_info.siginfo = *siginfo;
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if(cc_user_info)
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cc_user_info(crash_info.buf, crash_info.buf+sizeof(crash_info.buf));
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/* Fork off to start a crash handler */
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switch((dbg_pid=fork()))
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{
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/* Error */
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case -1:
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safe_write(STDERR_FILENO, fork_err, sizeof(fork_err)-1);
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raise(signum);
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return;
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case 0:
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dup2(fd[0], STDIN_FILENO);
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close(fd[0]);
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close(fd[1]);
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execl(argv0, argv0, crash_switch, NULL);
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safe_write(STDERR_FILENO, exec_err, sizeof(exec_err)-1);
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_exit(1);
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default:
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#ifdef __linux__
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prctl(PR_SET_PTRACER, dbg_pid, 0, 0, 0);
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#endif
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safe_write(fd[1], &crash_info, sizeof(crash_info));
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close(fd[0]);
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close(fd[1]);
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/* Wait; we'll be killed when gdb is done */
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do {
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int status;
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if(waitpid(dbg_pid, &status, 0) == dbg_pid &&
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(WIFEXITED(status) || WIFSIGNALED(status)))
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{
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/* The debug process died before it could kill us */
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raise(signum);
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break;
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}
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} while(1);
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}
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}
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static void crash_handler(const char *logfile)
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{
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const char *sigdesc = "";
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int i;
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if(fread(&crash_info, sizeof(crash_info), 1, stdin) != 1)
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{
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fprintf(stderr, "!!! Failed to retrieve info from crashed process\n");
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exit(1);
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}
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/* Get the signal description */
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for(i = 0;signals[i].name;++i)
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{
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if(signals[i].signum == crash_info.signum)
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{
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sigdesc = signals[i].name;
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break;
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}
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}
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if(crash_info.has_siginfo)
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{
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switch(crash_info.signum)
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{
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case SIGSEGV:
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for(i = 0;sigsegv_codes[i].name;++i)
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{
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if(sigsegv_codes[i].code == crash_info.siginfo.si_code)
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{
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sigdesc = sigsegv_codes[i].name;
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break;
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}
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}
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break;
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case SIGFPE:
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for(i = 0;sigfpe_codes[i].name;++i)
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{
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if(sigfpe_codes[i].code == crash_info.siginfo.si_code)
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{
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sigdesc = sigfpe_codes[i].name;
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break;
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}
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}
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break;
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case SIGILL:
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for(i = 0;sigill_codes[i].name;++i)
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{
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if(sigill_codes[i].code == crash_info.siginfo.si_code)
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{
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sigdesc = sigill_codes[i].name;
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break;
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}
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}
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break;
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case SIGBUS:
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for(i = 0;sigbus_codes[i].name;++i)
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{
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if(sigbus_codes[i].code == crash_info.siginfo.si_code)
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{
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sigdesc = sigbus_codes[i].name;
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break;
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}
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}
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break;
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}
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}
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fprintf(stderr, "%s (signal %i)\n", sigdesc, crash_info.signum);
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if(crash_info.has_siginfo)
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fprintf(stderr, "Address: %p\n", crash_info.siginfo.si_addr);
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fputc('\n', stderr);
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if(logfile)
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{
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/* Create crash log file and redirect shell output to it */
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if(freopen(logfile, "wa", stdout) != stdout)
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{
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fprintf(stderr, "!!! Could not create %s following signal\n", logfile);
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exit(1);
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}
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fprintf(stderr, "Generating %s and killing process %d, please wait... ", logfile, crash_info.pid);
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printf("*** Fatal Error ***\n"
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"%s (signal %i)\n", sigdesc, crash_info.signum);
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if(crash_info.has_siginfo)
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printf("Address: %p\n", crash_info.siginfo.si_addr);
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fputc('\n', stdout);
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fflush(stdout);
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}
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sys_info();
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crash_info.buf[sizeof(crash_info.buf)-1] = '\0';
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printf("%s\n", crash_info.buf);
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fflush(stdout);
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if(crash_info.pid > 0)
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{
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gdb_info(crash_info.pid);
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kill(crash_info.pid, SIGKILL);
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}
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// delay between killing of the crashed process and showing the message box to
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// work around occasional X server lock-up. this can only be a bug in X11 since
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// even faulty applications shouldn't be able to freeze the X server.
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usleep(100000);
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if(logfile)
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{
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std::string message = "OpenMW has encountered a fatal error.\nCrash log saved to '" + std::string(logfile) + "'.\n Please report this to https://bugs.openmw.org !";
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SDL_ShowSimpleMessageBox(0, "Fatal Error", message.c_str(), NULL);
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}
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exit(0);
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}
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int crashCatcherInstallHandlers(int argc, char **argv, int num_signals, int *signals, const char *logfile, int (*user_info)(char*, char*))
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{
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struct sigaction sa;
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stack_t altss;
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int retval;
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if(argc == 2 && strcmp(argv[1], crash_switch) == 0)
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crash_handler(logfile);
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cc_user_info = user_info;
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if(argv[0][0] == '/')
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snprintf(argv0, sizeof(argv0), "%s", argv[0]);
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else
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{
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{
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/* we don't want to disable "ignoring return value" warnings, so we make
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* a special exception here. */
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char * unused;
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unused = getcwd(argv0, sizeof(argv0));
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UNUSED(unused);
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}
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retval = strlen(argv0);
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snprintf(argv0+retval, sizeof(argv0)-retval, "/%s", argv[0]);
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}
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/* Set an alternate signal stack so SIGSEGVs caused by stack overflows
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* still run */
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altss.ss_sp = altstack;
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altss.ss_flags = 0;
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altss.ss_size = sizeof(altstack);
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sigaltstack(&altss, NULL);
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memset(&sa, 0, sizeof(sa));
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sa.sa_sigaction = crash_catcher;
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sa.sa_flags = SA_RESETHAND | SA_NODEFER | SA_SIGINFO | SA_ONSTACK;
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sigemptyset(&sa.sa_mask);
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retval = 0;
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while(num_signals--)
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{
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if((*signals != SIGSEGV && *signals != SIGILL && *signals != SIGFPE && *signals != SIGABRT &&
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*signals != SIGBUS) || sigaction(*signals, &sa, NULL) == -1)
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{
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*signals = 0;
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retval = -1;
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}
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++signals;
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}
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return retval;
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}
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static bool is_debugger_present()
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{
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#if !defined (__APPLE__)
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bfs::ifstream file((bfs::path("/proc/self/status")));
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while (!file.eof())
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{
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std::string word;
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file >> word;
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if (word == "TracerPid:")
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{
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file >> word;
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return word != "0";
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}
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}
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return false;
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#else
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int junk;
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int mib[4];
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struct kinfo_proc info;
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size_t size;
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// Initialize the flags so that, if sysctl fails for some bizarre
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// reason, we get a predictable result.
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info.kp_proc.p_flag = 0;
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// Initialize mib, which tells sysctl the info we want, in this case
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// we're looking for information about a specific process ID.
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PID;
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mib[3] = getpid();
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// Call sysctl.
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size = sizeof(info);
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junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);
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assert(junk == 0);
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// We're being debugged if the P_TRACED flag is set.
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return (info.kp_proc.p_flag & P_TRACED) != 0;
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#endif
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}
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void crashCatcherInstall(int argc, char **argv, const std::string &crashLogPath)
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{
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if ((argc == 2 && strcmp(argv[1], "--cc-handle-crash") == 0) || !is_debugger_present())
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{
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int s[5] = { SIGSEGV, SIGILL, SIGFPE, SIGBUS, SIGABRT };
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if (crashCatcherInstallHandlers(argc, argv, 5, s, crashLogPath.c_str(), NULL) == -1)
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{
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std::cerr << "Installing crash handler failed" << std::endl;
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} else
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std::cout << "Crash handler installed" << std::endl;
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}
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}
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