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Diffstat (limited to 'sal/osl/unx/signal.cxx')
| -rw-r--r-- | sal/osl/unx/signal.cxx | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/sal/osl/unx/signal.cxx b/sal/osl/unx/signal.cxx new file mode 100644 index 0000000000..50c260f9d5 --- /dev/null +++ b/sal/osl/unx/signal.cxx @@ -0,0 +1,450 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <sal/config.h> + +#include <signalshared.hxx> + +#include <config_features.h> + +#include "soffice.hxx" + +#include "backtrace.h" + +#define MAX_STACK_FRAMES 256 + +#include <osl/diagnose.h> +#include <osl/signal.h> +#include <sal/log.hxx> +#include <sal/macros.h> + +#define ACT_IGNORE 1 +#define ACT_EXIT 2 +#define ACT_SYSTEM 3 +#define ACT_HIDE 4 +#define ACT_ABORT 5 + +#if defined HAVE_VALGRIND_HEADERS +#include <valgrind/memcheck.h> +#endif + +#include <signal.h> +#include <unistd.h> + +namespace +{ +extern "C" using Handler1 = void (*)(int); +extern "C" using Handler2 = void (*)(int, siginfo_t *, void *); +struct SignalAction +{ + int Signal; + int Action; + Handler1 Handler; + bool siginfo; // Handler's type is Handler2 +} Signals[] = +{ + { SIGHUP, ACT_HIDE, SIG_DFL, false }, /* hangup */ + { SIGINT, ACT_EXIT, SIG_DFL, false }, /* interrupt (rubout) */ + { SIGQUIT, ACT_EXIT, SIG_DFL, false }, /* quit (ASCII FS) */ + { SIGILL, ACT_SYSTEM, SIG_DFL, false }, /* illegal instruction (not reset when caught) */ +/* changed from ACT_ABOUT to ACT_SYSTEM to try and get collector to run*/ + { SIGTRAP, ACT_ABORT, SIG_DFL, false }, /* trace trap (not reset when caught) */ +#if ( SIGIOT != SIGABRT ) + { SIGIOT, ACT_ABORT, SIG_DFL, false }, /* IOT instruction */ +#endif +#if defined(FORCE_DEFAULT_SIGNAL) + { SIGABRT, ACT_SYSTEM, SIG_DFL, false }, /* used by abort, replace SIGIOT in the future */ +#else + { SIGABRT, ACT_ABORT, SIG_DFL, false }, /* used by abort, replace SIGIOT in the future */ +#endif +#ifdef SIGEMT + { SIGEMT, ACT_SYSTEM, SIG_DFL, false }, /* EMT instruction */ +/* changed from ACT_ABORT to ACT_SYSTEM to remove handler*/ +/* SIGEMT may also be used by the profiler - so it is probably not a good +plan to have the new handler use this signal*/ +#endif + { SIGFPE, ACT_ABORT, SIG_DFL, false }, /* floating point exception */ + { SIGKILL, ACT_SYSTEM, SIG_DFL, false }, /* kill (cannot be caught or ignored) */ + { SIGBUS, ACT_ABORT, SIG_DFL, false }, /* bus error */ +#if defined(FORCE_DEFAULT_SIGNAL) + { SIGSEGV, ACT_SYSTEM, SIG_DFL, false }, /* segmentation violation */ +#else + { SIGSEGV, ACT_ABORT, SIG_DFL, false }, /* segmentation violation */ +#endif +#ifdef SIGSYS + { SIGSYS, ACT_ABORT, SIG_DFL, false }, /* bad argument to system call */ +#endif + { SIGPIPE, ACT_HIDE, SIG_DFL, false }, /* write on a pipe with no one to read it */ +#if defined(FORCE_DEFAULT_SIGNAL) + { SIGALRM, ACT_SYSTEM, SIG_DFL, false }, /* alarm clock */ +#else + { SIGALRM, ACT_EXIT, SIG_DFL, false }, /* alarm clock */ +#endif + { SIGTERM, ACT_EXIT, SIG_DFL, false }, /* software termination signal from kill */ + { SIGUSR1, ACT_SYSTEM, SIG_DFL, false }, /* user defined signal 1 */ + { SIGUSR2, ACT_SYSTEM, SIG_DFL, false }, /* user defined signal 2 */ + { SIGCHLD, ACT_SYSTEM, SIG_DFL, false }, /* child status change */ +#ifdef SIGPWR + { SIGPWR, ACT_IGNORE, SIG_DFL, false }, /* power-fail restart */ +#endif + { SIGWINCH, ACT_IGNORE, SIG_DFL, false }, /* window size change */ + { SIGURG, ACT_EXIT, SIG_DFL, false }, /* urgent socket condition */ +#ifdef SIGPOLL + { SIGPOLL, ACT_EXIT, SIG_DFL, false }, /* pollable event occurred */ +#endif + { SIGSTOP, ACT_SYSTEM, SIG_DFL, false }, /* stop (cannot be caught or ignored) */ + { SIGTSTP, ACT_SYSTEM, SIG_DFL, false }, /* user stop requested from tty */ + { SIGCONT, ACT_SYSTEM, SIG_DFL, false }, /* stopped process has been continued */ + { SIGTTIN, ACT_SYSTEM, SIG_DFL, false }, /* background tty read attempted */ + { SIGTTOU, ACT_SYSTEM, SIG_DFL, false }, /* background tty write attempted */ + { SIGVTALRM, ACT_EXIT, SIG_DFL, false }, /* virtual timer expired */ + { SIGPROF, ACT_SYSTEM, SIG_DFL, false }, /* profiling timer expired */ +/*Change from ACT_EXIT to ACT_SYSTEM for SIGPROF is so that profiling signals do +not get taken by the new handler - the new handler does not pass on context +information which causes 'collect' to crash. This is a way of avoiding +what looks like a bug in the new handler*/ + { SIGXCPU, ACT_ABORT, SIG_DFL, false }, /* exceeded cpu limit */ + { SIGXFSZ, ACT_ABORT, SIG_DFL, false } /* exceeded file size limit */ +}; +const int NoSignals = SAL_N_ELEMENTS(Signals); + +bool bSetSEGVHandler = false; +bool bSetWINCHHandler = false; +bool bSetILLHandler = false; + +void signalHandlerFunction(int, siginfo_t *, void *); + +#if HAVE_FEATURE_BREAKPAD +bool is_unset_signal(int signal) +{ +#ifdef DBG_UTIL + return (!bSetSEGVHandler && signal == SIGSEGV) || + (!bSetWINCHHandler && signal == SIGWINCH) || + (!bSetILLHandler && signal == SIGILL); +#else + (void) signal; + return false; +#endif +} +#endif + +} + +bool onInitSignal() +{ + if (sal::detail::isSoffice()) + { + // WORKAROUND FOR SEGV HANDLER CONFLICT + // + // the java jit needs SIGSEGV for proper work + // and we need SIGSEGV for the office crashguard + // + // TEMPORARY SOLUTION: + // the office sets the signal handler during startup + // java can than overwrite it, if needed + bSetSEGVHandler = true; + + // WORKAROUND FOR WINCH HANDLER (SEE ABOVE) + bSetWINCHHandler = true; + + // WORKAROUND FOR ILLEGAL INSTRUCTION HANDLER (SEE ABOVE) + bSetILLHandler = true; + } + +#ifdef DBG_UTIL + bSetSEGVHandler = bSetWINCHHandler = bSetILLHandler = false; +#endif + + struct sigaction act; + act.sa_sigaction = signalHandlerFunction; + act.sa_flags = SA_RESTART | SA_SIGINFO; + + sigfillset(&(act.sa_mask)); + + /* Initialize the rest of the signals */ + for (SignalAction & rSignal : Signals) + { +#if defined HAVE_VALGRIND_HEADERS + if (rSignal.Signal == SIGUSR2 && RUNNING_ON_VALGRIND) + rSignal.Action = ACT_IGNORE; +#endif + + /* hack: stomcatd is attaching JavaVM which does not work with an sigaction(SEGV) */ + if ((bSetSEGVHandler || rSignal.Signal != SIGSEGV) + && (bSetWINCHHandler || rSignal.Signal != SIGWINCH) + && (bSetILLHandler || rSignal.Signal != SIGILL)) + { + if (rSignal.Action != ACT_SYSTEM) + { + if (rSignal.Action == ACT_HIDE) + { + struct sigaction ign; + + ign.sa_handler = SIG_IGN; + ign.sa_flags = 0; + sigemptyset(&ign.sa_mask); + + struct sigaction oact; + if (sigaction(rSignal.Signal, &ign, &oact) == 0) { + rSignal.siginfo = (oact.sa_flags & SA_SIGINFO) != 0; + if (rSignal.siginfo) { + rSignal.Handler = reinterpret_cast<Handler1>( + oact.sa_sigaction); + } else { + rSignal.Handler = oact.sa_handler; + } + } else { + rSignal.Handler = SIG_DFL; + rSignal.siginfo = false; + } + } + else + { + struct sigaction oact; + if (sigaction(rSignal.Signal, &act, &oact) == 0) { + rSignal.siginfo = (oact.sa_flags & SA_SIGINFO) != 0; + if (rSignal.siginfo) { + rSignal.Handler = reinterpret_cast<Handler1>( + oact.sa_sigaction); + } else { + rSignal.Handler = oact.sa_handler; + } + } else { + rSignal.Handler = SIG_DFL; + rSignal.siginfo = false; + } + } + } + } + } + + /* Clear signal mask inherited from parent process (on macOS, upon a + crash soffice re-execs itself from within the signal handler, so the + second soffice would have the guilty signal blocked and would freeze upon + encountering a similar crash again): */ + sigset_t unset; + if (sigemptyset(&unset) < 0 || + pthread_sigmask(SIG_SETMASK, &unset, nullptr) < 0) + { + SAL_WARN("sal.osl", "sigemptyset or pthread_sigmask failed"); + } + + return true; +} + +bool onDeInitSignal() +{ + struct sigaction act; + + sigemptyset(&(act.sa_mask)); + + /* Initialize the rest of the signals */ + for (int i = NoSignals - 1; i >= 0; i--) + if (Signals[i].Action != ACT_SYSTEM + && ((bSetSEGVHandler || Signals[i].Signal != SIGSEGV) + && (bSetWINCHHandler || Signals[i].Signal != SIGWINCH) + && (bSetILLHandler || Signals[i].Signal != SIGILL))) + { + if (Signals[i].siginfo) { + act.sa_sigaction = reinterpret_cast<Handler2>( + Signals[i].Handler); + act.sa_flags = SA_SIGINFO; + } else { + act.sa_handler = Signals[i].Handler; + act.sa_flags = 0; + } + + sigaction(Signals[i].Signal, &act, nullptr); + } + + return false; +} + +namespace +{ +void printStack(int sig) +{ + void *buffer[MAX_STACK_FRAMES]; + int size = backtrace( buffer, SAL_N_ELEMENTS(buffer) ); + + fprintf( stderr, "\n\nFatal exception: Signal %d\n", sig ); + +#if ! HAVE_FEATURE_BACKTRACE && defined( MACOSX ) && !defined( INTEL ) + fprintf( stderr, "Please turn on Enable Crash Reporting and\nAutomatic Display of Crashlogs in the Console application\n" ); +#endif + + if ( size > 0 ) + { + fputs( "Stack:\n", stderr ); + backtrace_symbols_fd( buffer, size, fileno(stderr) ); + } +} + +void callSystemHandler(int signal, siginfo_t * info, void * context) +{ + int i; + + for (i = 0; i < NoSignals; i++) + { + if (Signals[i].Signal == signal) + break; + } + + if (i >= NoSignals) + return; + + if ((Signals[i].Handler == SIG_DFL) || + (Signals[i].Handler == SIG_IGN) || + (Signals[i].Handler == SIG_ERR)) + { + switch (Signals[i].Action) + { + case ACT_EXIT: /* terminate */ + /* prevent dumping core on exit() */ + _exit(255); + break; + + case ACT_ABORT: /* terminate with core dump */ + struct sigaction act; + act.sa_handler = SIG_DFL; + act.sa_flags = 0; + sigemptyset(&(act.sa_mask)); + sigaction(SIGABRT, &act, nullptr); + printStack( signal ); + abort(); + break; + + case ACT_IGNORE: /* ignore */ + break; + + default: /* should never happen */ + OSL_ASSERT(false); + } + } + else if (Signals[i].siginfo) { + (*reinterpret_cast<Handler2>(Signals[i].Handler))( + signal, info, context); + } else { + (*Signals[i].Handler)(signal); + } +} + +#if defined HAVE_VALGRIND_HEADERS +void DUMPCURRENTALLOCS() +{ + VALGRIND_PRINTF( "=== start memcheck dump of active allocations ===\n" ); + +#if __GNUC__ && !defined(__clang__) +# pragma GCC diagnostic push +# pragma GCC diagnostic ignored "-Wunused-but-set-variable" +#endif + + VALGRIND_DO_LEAK_CHECK; + +#if __GNUC__ && !defined(__clang__) +# pragma GCC diagnostic pop +#endif + + VALGRIND_PRINTF( "=== end memcheck dump of active allocations ===\n" ); +} +#endif + +void signalHandlerFunction(int signal, siginfo_t * info, void * context) +{ + oslSignalInfo Info; + + Info.UserSignal = signal; + Info.UserData = nullptr; + + switch (signal) + { + case SIGBUS: + case SIGILL: + case SIGSEGV: + case SIGIOT: +#if ( SIGIOT != SIGABRT ) + case SIGABRT: +#endif + Info.Signal = osl_Signal_AccessViolation; + break; + + case -1: + Info.Signal = osl_Signal_IntegerDivideByZero; + break; + + case SIGFPE: + Info.Signal = osl_Signal_FloatDivideByZero; + break; + + case SIGINT: + case SIGTERM: + case SIGQUIT: + Info.Signal = osl_Signal_Terminate; + break; + +#if defined HAVE_VALGRIND_HEADERS + case SIGUSR2: + if (RUNNING_ON_VALGRIND) + DUMPCURRENTALLOCS(); + Info.Signal = osl_Signal_System; + break; +#endif + + default: + Info.Signal = osl_Signal_System; + break; + } + +#if HAVE_FEATURE_BREAKPAD + if ((Info.Signal == osl_Signal_AccessViolation || + Info.Signal == osl_Signal_IntegerDivideByZero || + Info.Signal == osl_Signal_FloatDivideByZero) && !is_unset_signal(signal)) + { + callSystemHandler(signal, info, context); + } +#endif + + switch (callSignalHandler(&Info)) + { + case osl_Signal_ActCallNextHdl: + callSystemHandler(signal, info, context); + break; + + case osl_Signal_ActAbortApp: + struct sigaction act; + act.sa_handler = SIG_DFL; + act.sa_flags = 0; + sigemptyset(&(act.sa_mask)); + sigaction(SIGABRT, &act, nullptr); + printStack( signal ); + abort(); + break; + + case osl_Signal_ActKillApp: + /* prevent dumping core on exit() */ + _exit(255); + break; + default: + break; + } +} + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |