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fune/toolkit/xre/nsSigHandlers.cpp
Emilio Cobos Álvarez 81a6ef4402 Bug 1759785 - Intercept crashy GTK messages that we don't have visibility into. r=stransky 
This should get us crash reports for Wayland errors that otherwise we're
blind to, see comments.

Some of those might be expected / not our fault (if the Wayland
compositor crashes altogether for example), but in that case we're
unlikely to even be able to pop up the crash reporter window.

Worst case we can always revert this I guess.

Differential Revision: https://phabricator.services.mozilla.com/D141173
2022-04-11 13:03:22 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 module is supposed to abstract signal handling away from the other
* platforms that do not support it.
*/
#include "nsSigHandlers.h"
#ifdef XP_UNIX
# include <signal.h>
# include <stdio.h>
# include <string.h>
# include "prthread.h"
# include "prenv.h"
# include "nsDebug.h"
# include "nsString.h"
# include "nsXULAppAPI.h"
# if defined(LINUX)
# include <sys/time.h>
# include <sys/resource.h>
# include <unistd.h>
# include <stdlib.h> // atoi
# include <sys/prctl.h>
# ifndef ANDROID // no Android impl
# include <ucontext.h>
# endif
# endif
# if defined(SOLARIS)
# include <sys/resource.h>
# include <ucontext.h>
# endif
// Note: some tests manipulate this value.
unsigned int _gdb_sleep_duration = 300;
# if defined(LINUX) && !defined(ANDROID) && defined(DEBUG) && \
(defined(__i386) || defined(__x86_64) || defined(PPC))
# define CRAWL_STACK_ON_SIGSEGV
# endif
# ifndef PR_SET_PTRACER
# define PR_SET_PTRACER 0x59616d61
# endif
# ifndef PR_SET_PTRACER_ANY
# define PR_SET_PTRACER_ANY ((unsigned long)-1)
# endif
# if defined(CRAWL_STACK_ON_SIGSEGV)
# include <unistd.h>
# include "nsISupportsUtils.h"
# include "mozilla/Attributes.h"
# include "mozilla/StackWalk.h"
static const char* gProgname = "huh?";
// NB: keep me up to date with the same variable in
// ipc/chromium/chrome/common/ipc_channel_posix.cc
static const int kClientChannelFd = 3;
extern "C" {
static void PrintStackFrame(uint32_t aFrameNumber, void* aPC, void* aSP,
void* aClosure) {
char buf[1024];
MozCodeAddressDetails details;
MozDescribeCodeAddress(aPC, &details);
MozFormatCodeAddressDetails(buf, sizeof(buf), aFrameNumber, aPC, &details);
fprintf(stdout, "%s\n", buf);
fflush(stdout);
}
}
void common_crap_handler(int signum, const void* aFirstFramePC) {
printf("\nProgram %s (pid = %d) received signal %d.\n", gProgname, getpid(),
signum);
printf("Stack:\n");
MozStackWalk(PrintStackFrame, aFirstFramePC, /* maxFrames */ 0, nullptr);
printf("Sleeping for %d seconds.\n", _gdb_sleep_duration);
printf("Type 'gdb %s %d' to attach your debugger to this thread.\n",
gProgname, getpid());
// Allow us to be ptraced by gdb on Linux with Yama restrictions enabled.
prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY);
sleep(_gdb_sleep_duration);
printf("Done sleeping...\n");
_exit(signum);
}
MOZ_NEVER_INLINE void ah_crap_handler(int signum) {
common_crap_handler(signum, CallerPC());
}
MOZ_NEVER_INLINE void child_ah_crap_handler(int signum) {
if (!getenv("MOZ_DONT_UNBLOCK_PARENT_ON_CHILD_CRASH"))
close(kClientChannelFd);
common_crap_handler(signum, CallerPC());
}
# endif // CRAWL_STACK_ON_SIGSEGV
# ifdef MOZ_WIDGET_GTK
// Need this include for version test below.
# include <glib.h>
# endif
# if defined(MOZ_WIDGET_GTK) && \
(GLIB_MAJOR_VERSION > 2 || \
(GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
static GLogFunc orig_log_func = nullptr;
extern "C" {
static void glib_log_func(const gchar* log_domain, GLogLevelFlags log_level,
const gchar* message, gpointer user_data);
}
// GDK sometimes avoids calling exit handlers, but we still want to know when we
// crash, see https://gitlab.gnome.org/GNOME/gtk/-/issues/4514 and bug 1743144.
static bool IsCrashyGtkMessage(const nsACString& aMessage) {
if (aMessage.EqualsLiteral("Lost connection to Wayland compositor.")) {
// https://gitlab.gnome.org/GNOME/gtk/-/blob/gtk-3-24/gdk/wayland/gdkeventsource.c#L210
return true;
}
if (StringBeginsWith(aMessage, "Error flushing display: "_ns)) {
// https://gitlab.gnome.org/GNOME/gtk/-/blob/gtk-3-24/gdk/wayland/gdkeventsource.c#L68
return true;
}
if (StringBeginsWith(aMessage, "Error reading events from display: "_ns)) {
// https://gitlab.gnome.org/GNOME/gtk/-/blob/gtk-3-24/gdk/wayland/gdkeventsource.c#L97
return true;
}
if (StringBeginsWith(aMessage, "Error "_ns) &&
StringEndsWith(aMessage, " dispatching to Wayland display."_ns)) {
// https://gitlab.gnome.org/GNOME/gtk/-/blob/gtk-3-24/gdk/wayland/gdkeventsource.c#L205
return true;
}
return false;
}
/* static */ void glib_log_func(const gchar* log_domain,
GLogLevelFlags log_level, const gchar* message,
gpointer user_data) {
if (MOZ_UNLIKELY(IsCrashyGtkMessage(nsDependentCString(message)))) {
MOZ_CRASH_UNSAFE(strdup(message));
}
if (log_level &
(G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION)) {
NS_DebugBreak(NS_DEBUG_ASSERTION, message, "glib assertion", __FILE__,
__LINE__);
} else if (log_level & (G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING)) {
NS_DebugBreak(NS_DEBUG_WARNING, message, "glib warning", __FILE__,
__LINE__);
}
orig_log_func(log_domain, log_level, message, nullptr);
}
# endif
# ifdef SA_SIGINFO
static void fpehandler(int signum, siginfo_t* si, void* context) {
/* Integer divide by zero or integer overflow. */
/* Note: FPE_INTOVF is ignored on Intel, PowerPC and SPARC systems. */
if (si->si_code == FPE_INTDIV || si->si_code == FPE_INTOVF) {
NS_DebugBreak(NS_DEBUG_ABORT, "Divide by zero", nullptr, __FILE__,
__LINE__);
}
# ifdef XP_MACOSX
# if defined(__i386__) || defined(__amd64__)
ucontext_t* uc = (ucontext_t*)context;
_STRUCT_FP_CONTROL* ctrl = &uc->uc_mcontext->__fs.__fpu_fcw;
ctrl->__invalid = ctrl->__denorm = ctrl->__zdiv = ctrl->__ovrfl =
ctrl->__undfl = ctrl->__precis = 1;
_STRUCT_FP_STATUS* status = &uc->uc_mcontext->__fs.__fpu_fsw;
status->__invalid = status->__denorm = status->__zdiv = status->__ovrfl =
status->__undfl = status->__precis = status->__stkflt =
status->__errsumm = 0;
uint32_t* mxcsr = &uc->uc_mcontext->__fs.__fpu_mxcsr;
*mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
*mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
# endif
# endif
# if defined(LINUX) && !defined(ANDROID)
# if defined(__i386__)
ucontext_t* uc = (ucontext_t*)context;
/*
* It seems that we have no access to mxcsr on Linux. libc
* seems to be translating cw/sw to mxcsr.
*/
unsigned long int* cw = &uc->uc_mcontext.fpregs->cw;
*cw |= FPU_EXCEPTION_MASK;
unsigned long int* sw = &uc->uc_mcontext.fpregs->sw;
*sw &= ~FPU_STATUS_FLAGS;
# endif
# if defined(__amd64__)
ucontext_t* uc = (ucontext_t*)context;
uint16_t* cw = &uc->uc_mcontext.fpregs->cwd;
*cw |= FPU_EXCEPTION_MASK;
uint16_t* sw = &uc->uc_mcontext.fpregs->swd;
*sw &= ~FPU_STATUS_FLAGS;
uint32_t* mxcsr = &uc->uc_mcontext.fpregs->mxcsr;
*mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
*mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
# endif
# endif
# ifdef SOLARIS
ucontext_t* uc = (ucontext_t*)context;
# if defined(__i386)
uint32_t* cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[0];
*cw |= FPU_EXCEPTION_MASK;
uint32_t* sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[1];
*sw &= ~FPU_STATUS_FLAGS;
/* address of the instruction that caused the exception */
uint32_t* ip = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.state[3];
uc->uc_mcontext.gregs[REG_PC] = *ip;
# endif
# if defined(__amd64__)
uint16_t* cw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.cw;
*cw |= FPU_EXCEPTION_MASK;
uint16_t* sw = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.sw;
*sw &= ~FPU_STATUS_FLAGS;
uint32_t* mxcsr = &uc->uc_mcontext.fpregs.fp_reg_set.fpchip_state.mxcsr;
*mxcsr |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
*mxcsr &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
# endif
# endif
}
# endif
void InstallSignalHandlers(const char* aProgname) {
# if defined(CRAWL_STACK_ON_SIGSEGV)
if (aProgname) {
const char* tmp = strdup(aProgname);
if (tmp) {
gProgname = tmp;
}
}
# endif // CRAWL_STACK_ON_SIGSEGV
const char* gdbSleep = PR_GetEnv("MOZ_GDB_SLEEP");
if (gdbSleep && *gdbSleep) {
unsigned int s;
if (1 == sscanf(gdbSleep, "%u", &s)) {
_gdb_sleep_duration = s;
}
}
# if defined(CRAWL_STACK_ON_SIGSEGV)
if (!getenv("XRE_NO_WINDOWS_CRASH_DIALOG")) {
void (*crap_handler)(int) = GeckoProcessType_Default != XRE_GetProcessType()
? child_ah_crap_handler
: ah_crap_handler;
signal(SIGSEGV, crap_handler);
signal(SIGILL, crap_handler);
signal(SIGABRT, crap_handler);
}
# endif // CRAWL_STACK_ON_SIGSEGV
# ifdef SA_SIGINFO
/* Install a handler for floating point exceptions and disable them if they
* occur. */
struct sigaction sa, osa;
sa.sa_flags = SA_ONSTACK | SA_RESTART | SA_SIGINFO;
sa.sa_sigaction = fpehandler;
sigemptyset(&sa.sa_mask);
sigaction(SIGFPE, &sa, &osa);
# endif
if (!XRE_IsParentProcess()) {
/*
* If the user is debugging a Gecko parent process in gdb and hits ^C to
* suspend, a SIGINT signal will be sent to the child. We ignore this signal
* so the child isn't killed.
*/
signal(SIGINT, SIG_IGN);
}
# if defined(DEBUG) && defined(LINUX)
const char* memLimit = PR_GetEnv("MOZ_MEM_LIMIT");
if (memLimit && *memLimit) {
long m = atoi(memLimit);
m *= (1024 * 1024);
struct rlimit r;
r.rlim_cur = m;
r.rlim_max = m;
setrlimit(RLIMIT_AS, &r);
}
# endif
# if defined(MOZ_WIDGET_GTK) && \
(GLIB_MAJOR_VERSION > 2 || \
(GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
// Override the default glib logging function to intercept some crashes that
// are uninterceptable otherwise.
// Also, when XPCOM_DEBUG_BREAK is set, we can also get stacks for them.
// so we get stacks for it too.
orig_log_func = g_log_set_default_handler(glib_log_func, nullptr);
# endif
}
#elif XP_WIN
# include <windows.h>
# ifdef _M_IX86
/*
* WinNT.h prior to SDK7 does not expose the structure of the ExtendedRegisters
* for ia86. We known that MxCsr is at offset 0x18 and is a DWORD.
*/
# define MXCSR(ctx) (*(DWORD*)(((BYTE*)(ctx)->ExtendedRegisters) + 0x18))
# endif
# ifdef _M_X64
# define MXCSR(ctx) (ctx)->MxCsr
# endif
# if defined(_M_IX86) || defined(_M_X64)
# ifdef _M_X64
# define X87CW(ctx) (ctx)->FltSave.ControlWord
# define X87SW(ctx) (ctx)->FltSave.StatusWord
# else
# define X87CW(ctx) (ctx)->FloatSave.ControlWord
# define X87SW(ctx) (ctx)->FloatSave.StatusWord
# endif
static LPTOP_LEVEL_EXCEPTION_FILTER gFPEPreviousFilter;
LONG __stdcall FpeHandler(PEXCEPTION_POINTERS pe) {
PEXCEPTION_RECORD e = (PEXCEPTION_RECORD)pe->ExceptionRecord;
CONTEXT* c = (CONTEXT*)pe->ContextRecord;
switch (e->ExceptionCode) {
case STATUS_FLOAT_DENORMAL_OPERAND:
case STATUS_FLOAT_DIVIDE_BY_ZERO:
case STATUS_FLOAT_INEXACT_RESULT:
case STATUS_FLOAT_INVALID_OPERATION:
case STATUS_FLOAT_OVERFLOW:
case STATUS_FLOAT_STACK_CHECK:
case STATUS_FLOAT_UNDERFLOW:
case STATUS_FLOAT_MULTIPLE_FAULTS:
case STATUS_FLOAT_MULTIPLE_TRAPS:
X87CW(c) |= FPU_EXCEPTION_MASK; /* disable all FPU exceptions */
X87SW(c) &= ~FPU_STATUS_FLAGS; /* clear all pending FPU exceptions */
# ifdef _M_IX86
if (c->ContextFlags & CONTEXT_EXTENDED_REGISTERS) {
# endif
MXCSR(c) |= SSE_EXCEPTION_MASK; /* disable all SSE exceptions */
MXCSR(c) &= ~SSE_STATUS_FLAGS; /* clear all pending SSE exceptions */
# ifdef _M_IX86
}
# endif
return EXCEPTION_CONTINUE_EXECUTION;
}
LONG action = EXCEPTION_CONTINUE_SEARCH;
if (gFPEPreviousFilter) action = gFPEPreviousFilter(pe);
return action;
}
void InstallSignalHandlers(const char* aProgname) {
gFPEPreviousFilter = SetUnhandledExceptionFilter(FpeHandler);
}
# else
void InstallSignalHandlers(const char* aProgname) {}
# endif
#else
# error No signal handling implementation for this platform.
#endif
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