From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- toolkit/xre/nsSigHandlers.cpp | 450 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 450 insertions(+) create mode 100644 toolkit/xre/nsSigHandlers.cpp (limited to 'toolkit/xre/nsSigHandlers.cpp') diff --git a/toolkit/xre/nsSigHandlers.cpp b/toolkit/xre/nsSigHandlers.cpp new file mode 100644 index 0000000000..a9679eab75 --- /dev/null +++ b/toolkit/xre/nsSigHandlers.cpp @@ -0,0 +1,450 @@ +/* -*- 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 +# include +# include +# include "prthread.h" +# include "prenv.h" +# include "nsDebug.h" +# include "nsString.h" +# include "nsXULAppAPI.h" + +# if defined(LINUX) +# include +# include +# include +# include // atoi +# include +# ifndef ANDROID // no Android impl +# include +# endif +# endif + +# if defined(SOLARIS) +# include +# include +# endif + +# ifdef MOZ_WIDGET_GTK +# include +# 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 +# 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 +# endif + +# if defined(MOZ_WIDGET_GTK) + +# if GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION < 50 +// These types are only available in glib 2.50+ +typedef enum { + G_LOG_WRITER_HANDLED = 1, + G_LOG_WRITER_UNHANDLED = 0, +} GLogWriterOutput; +typedef struct _GLogField GLogField; +struct _GLogField { + const gchar* key; + gconstpointer value; + gssize length; +}; +typedef GLogWriterOutput (*GLogWriterFunc)(GLogLevelFlags log_level, + const GLogField* fields, + gsize n_fields, gpointer user_data); +# endif + +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); +static GLogWriterOutput glib_log_writer_func(GLogLevelFlags, const GLogField*, + gsize, gpointer); +} + +// 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 HandleGLibMessage(GLogLevelFlags aLogLevel, + const nsDependentCString& aMessage) { + if (MOZ_UNLIKELY(IsCrashyGtkMessage(aMessage))) { + MOZ_CRASH_UNSAFE(strdup(aMessage.get())); + } + + if (aLogLevel & + (G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION)) { + NS_DebugBreak(NS_DEBUG_ASSERTION, aMessage.get(), "glib assertion", + __FILE__, __LINE__); + } else if (aLogLevel & (G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_WARNING)) { + NS_DebugBreak(NS_DEBUG_WARNING, aMessage.get(), "glib warning", __FILE__, + __LINE__); + } +} + +/* static */ void glib_log_func(const gchar* log_domain, + GLogLevelFlags log_level, const gchar* message, + gpointer user_data) { + HandleGLibMessage(log_level, nsDependentCString(message)); + orig_log_func(log_domain, log_level, message, nullptr); +} + +GLogWriterOutput glib_log_writer_func(GLogLevelFlags flags, + const GLogField* fields, gsize n_fields, + gpointer user_data) { + static const GLogWriterFunc sLogWriterDefault = + (GLogWriterFunc)dlsym(RTLD_DEFAULT, "g_log_writer_default"); + for (gsize i = 0; i < n_fields; ++i) { + if (!strcmp(fields[i].key, "MESSAGE") && fields[i].length < 0) { + HandleGLibMessage(flags, + nsDependentCString((const char*)fields[i].value)); + break; + } + } + return sLogWriterDefault(flags, fields, n_fields, user_data); +} + +# 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 + +# ifdef MOZ_WIDGET_GTK + // 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. + // + // If we can hook via g_log_set_writer_func, then we don't need to hook via + // g_log_set_default_handler, because the GTK default handler uses structured + // logging and thus will end up in our log writer function anyways. + static const auto sSetLogWriter = + (void (*)(GLogWriterFunc, gpointer, GDestroyNotify))dlsym( + RTLD_DEFAULT, "g_log_set_writer_func"); + if (sSetLogWriter) { + sSetLogWriter(glib_log_writer_func, nullptr, nullptr); + } else { + orig_log_func = g_log_set_default_handler(glib_log_func, nullptr); + } +# endif +} + +#elif XP_WIN + +# include + +# 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 -- cgit v1.2.3