llvm/compiler-rt/lib/gwp_asan/optional/segv_handler_posix.cpp

//===-- segv_handler_posix.cpp ----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "gwp_asan/common.h"
#include "gwp_asan/crash_handler.h"
#include "gwp_asan/guarded_pool_allocator.h"
#include "gwp_asan/optional/segv_handler.h"
#include "gwp_asan/options.h"

// RHEL creates the PRIu64 format macro (for printing uint64_t's) only when this
// macro is defined before including <inttypes.h>.
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS …
#endif

#include <assert.h>
#include <inttypes.h>
#include <signal.h>
#include <stdio.h>

AllocationMetadata;
Error;
GuardedPoolAllocator;
Printf_t;
PrintBacktrace_t;
SegvBacktrace_t;

namespace {

struct ScopedEndOfReportDecorator { … };

// Prints the provided error and metadata information.
void printHeader(Error E, uintptr_t AccessPtr,
                 const gwp_asan::AllocationMetadata *Metadata,
                 Printf_t Printf) { … }

static bool HasReportedBadPoolAccess = …;
static const char *kUnknownCrashText = …;

void dumpReport(uintptr_t ErrorPtr, const gwp_asan::AllocatorState *State,
                const gwp_asan::AllocationMetadata *Metadata,
                SegvBacktrace_t SegvBacktrace, Printf_t Printf,
                PrintBacktrace_t PrintBacktrace, void *Context) { … }

struct sigaction PreviousHandler;
bool SignalHandlerInstalled;
bool RecoverableSignal;
gwp_asan::GuardedPoolAllocator *GPAForSignalHandler;
Printf_t PrintfForSignalHandler;
PrintBacktrace_t PrintBacktraceForSignalHandler;
SegvBacktrace_t BacktraceForSignalHandler;

static void sigSegvHandler(int sig, siginfo_t *info, void *ucontext) { … }
} // anonymous namespace

namespace gwp_asan {
namespace segv_handler {

void installSignalHandlers(gwp_asan::GuardedPoolAllocator *GPA, Printf_t Printf,
                           PrintBacktrace_t PrintBacktrace,
                           SegvBacktrace_t SegvBacktrace, bool Recoverable) { … }

void uninstallSignalHandlers() { … }
} // namespace segv_handler
} // namespace gwp_asan