mirror of
https://github.com/OpenMW/openmw.git
synced 2025-10-31 17:56:42 +00:00
570 lines
16 KiB
C++
570 lines
16 KiB
C++
#include <cstring>
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#include <errno.h>
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#include <filesystem>
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#include <fstream>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <sys/wait.h>
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#include <unistd.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 <components/debug/debuglog.hpp>
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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 <cassert>
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#include <libproc.h>
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#include <sys/sysctl.h>
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#endif
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#if defined(__FreeBSD__)
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#endif
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#include "crashcatcher.hpp"
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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 struct
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{
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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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{
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const char* name;
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int signum;
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} signals[] = { { "Segmentation fault", SIGSEGV }, { "Illegal instruction", SIGILL }, { "FPU exception", SIGFPE },
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{ "System BUS error", SIGBUS }, { nullptr, 0 } };
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static const struct
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{
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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" }, { ILL_ILLOPN, "Illegal operand" }, { ILL_ILLADR, "Illegal addressing mode" },
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{ ILL_ILLTRP, "Illegal trap" }, { ILL_PRVOPC, "Privileged opcode" }, { ILL_PRVREG, "Privileged register" },
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{ ILL_COPROC, "Coprocessor error" }, { ILL_BADSTK, "Internal stack error" },
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#endif
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{ 0, nullptr }
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};
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static const struct
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{
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int code;
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const char* name;
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} sigfpe_codes[] = { { FPE_INTDIV, "Integer divide by zero" }, { FPE_INTOVF, "Integer overflow" },
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{ FPE_FLTDIV, "Floating point divide by zero" }, { FPE_FLTOVF, "Floating point overflow" },
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{ FPE_FLTUND, "Floating point underflow" }, { FPE_FLTRES, "Floating point inexact result" },
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{ FPE_FLTINV, "Floating point invalid operation" }, { FPE_FLTSUB, "Subscript out of range" }, { 0, nullptr } };
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static const struct
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{
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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" }, { SEGV_ACCERR, "Invalid permissions for mapped object" },
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#endif
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{ 0, nullptr }
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};
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static const struct
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{
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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" }, { 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, nullptr }
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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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/*
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* Create a temp file to put gdb commands into.
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* Note: POSIX.1-2008 declares that the file should be already created with mode 0600 by default.
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* Modern systems implement it and suggest to do not touch masks in multithreaded applications.
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* So CoverityScan warning is valid only for ancient versions of stdlib.
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*/
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strcpy(respfile, "/tmp/gdb-respfile-XXXXXX");
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#ifdef __COVERITY__
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umask(0600);
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#endif
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if ((fd = mkstemp(respfile)) >= 0 && (f = fdopen(fd, "w")) != nullptr)
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{
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fprintf(f,
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"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",
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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(
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"\nFailed to create a crash report. Please make sure that 'gdb' is installed and present in PATH then "
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"crash again."
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"\nCurrent PATH: %s\n",
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getenv("PATH"));
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fflush(stdout);
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/* Clean up */
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if (remove(respfile) != 0)
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Log(Debug::Warning) << "Warning: can not remove file '" << respfile
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<< "': " << std::generic_category().message(errno);
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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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if (close(fd) != 0)
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Log(Debug::Warning) << "Warning: can not close file '" << respfile
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<< "': " << std::generic_category().message(errno);
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else if (remove(respfile) != 0)
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Log(Debug::Warning) << "Warning: can not remove file '" << respfile
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<< "': " << std::generic_category().message(errno);
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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", 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, nullptr);
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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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{
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int status;
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if (waitpid(dbg_pid, &status, 0) == dbg_pid && (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(
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"*** Fatal Error ***\n"
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"%s (signal %i)\n",
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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)
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+ "'.\n Please report this to https://gitlab.com/OpenMW/openmw/issues !";
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SDL_ShowSimpleMessageBox(0, "Fatal Error", message.c_str(), nullptr);
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}
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exit(0);
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}
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static void getExecPath(char** argv)
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{
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#if defined(__FreeBSD__)
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int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
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size_t size = sizeof(argv0);
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if (sysctl(mib, 4, argv0, &size, nullptr, 0) == 0)
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return;
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#endif
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#if defined(__APPLE__)
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if (proc_pidpath(getpid(), argv0, sizeof(argv0)) > 0)
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return;
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#endif
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int cwdlen;
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const char* statusPaths[] = { "/proc/self/exe", "/proc/self/file", "/proc/curproc/exe", "/proc/curproc/file" };
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memset(argv0, 0, sizeof(argv0));
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for (const char* path : statusPaths)
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{
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if (readlink(path, argv0, sizeof(argv0)) != -1)
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return;
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}
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if (argv[0][0] == '/')
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snprintf(argv0, sizeof(argv0), "%s", argv[0]);
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else if (getcwd(argv0, sizeof(argv0)) != nullptr)
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{
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cwdlen = strlen(argv0);
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snprintf(argv0 + cwdlen, sizeof(argv0) - cwdlen, "/%s", argv[0]);
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}
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}
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int crashCatcherInstallHandlers(
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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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getExecPath(argv);
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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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static char* altstack = new char[SIGSTKSZ];
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altss.ss_sp = altstack;
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altss.ss_flags = 0;
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altss.ss_size = SIGSTKSZ;
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sigaltstack(&altss, nullptr);
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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)
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|| sigaction(*signals, &sa, nullptr) == -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(__linux__)
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std::filesystem::path procstatus = std::filesystem::path("/proc/self/status");
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if (std::filesystem::exists(procstatus))
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{
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std::ifstream file((procstatus));
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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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}
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return false;
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#elif defined(__APPLE__)
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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;
|
|
mib[3] = getpid();
|
|
|
|
// Call sysctl.
|
|
|
|
size = sizeof(info);
|
|
junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, nullptr, 0);
|
|
assert(junk == 0);
|
|
|
|
// We're being debugged if the P_TRACED flag is set.
|
|
|
|
return (info.kp_proc.p_flag & P_TRACED) != 0;
|
|
#elif defined(__FreeBSD__)
|
|
struct kinfo_proc info;
|
|
size_t size = sizeof(info);
|
|
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid() };
|
|
|
|
if (sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, nullptr, 0) == 0)
|
|
return (info.ki_flag & P_TRACED) != 0;
|
|
else
|
|
perror("Failed to retrieve process info");
|
|
return false;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
void crashCatcherInstall(int argc, char** argv, const std::filesystem::path& crashLogPath)
|
|
{
|
|
if ((argc == 2 && strcmp(argv[1], crash_switch) == 0) || !is_debugger_present())
|
|
{
|
|
int s[5] = { SIGSEGV, SIGILL, SIGFPE, SIGBUS, SIGABRT };
|
|
if (crashCatcherInstallHandlers(argc, argv, 5, s, crashLogPath.c_str(), nullptr) == -1)
|
|
{
|
|
Log(Debug::Warning) << "Installing crash handler failed";
|
|
}
|
|
else
|
|
Log(Debug::Info) << "Crash handler installed";
|
|
}
|
|
}
|