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//===-- sanitizer_signal_interceptors.inc -----------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// Signal interceptors for sanitizers.
//
//===----------------------------------------------------------------------===//
#include "interception/interception.h"
#include "sanitizer_common.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_platform_interceptors.h"
using namespace __sanitizer;
#if SANITIZER_NETBSD
#define sigaction_symname __sigaction14
#else
#define sigaction_symname sigaction
#endif
#ifndef SIGNAL_INTERCEPTOR_SIGNAL_IMPL
#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signum, handler) \
{ return REAL(func)(signum, handler); }
#endif
#ifndef SIGNAL_INTERCEPTOR_SIGACTION_IMPL
# define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact) \
{ \
if (!REAL(sigaction_symname)) { \
Printf( \
"Warning: REAL(sigaction_symname) == nullptr. This may happen " \
"if you link with ubsan statically. Sigaction will not work.\n"); \
return -1; \
} \
return REAL(sigaction_symname)(signum, act, oldact); \
}
#endif
#if SANITIZER_INTERCEPT_BSD_SIGNAL
INTERCEPTOR(uptr, bsd_signal, int signum, uptr handler) {
if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
SIGNAL_INTERCEPTOR_SIGNAL_IMPL(bsd_signal, signum, handler);
}
#define INIT_BSD_SIGNAL COMMON_INTERCEPT_FUNCTION(bsd_signal)
#else // SANITIZER_INTERCEPT_BSD_SIGNAL
#define INIT_BSD_SIGNAL
#endif // SANITIZER_INTERCEPT_BSD_SIGNAL
#if SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
INTERCEPTOR(uptr, signal, int signum, uptr handler) {
if (GetHandleSignalMode(signum) == kHandleSignalExclusive)
return (uptr) nullptr;
SIGNAL_INTERCEPTOR_SIGNAL_IMPL(signal, signum, handler);
}
#define INIT_SIGNAL COMMON_INTERCEPT_FUNCTION(signal)
INTERCEPTOR(int, sigaction_symname, int signum,
const __sanitizer_sigaction *act, __sanitizer_sigaction *oldact) {
if (GetHandleSignalMode(signum) == kHandleSignalExclusive) {
if (!oldact) return 0;
act = nullptr;
}
SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact);
}
#define INIT_SIGACTION COMMON_INTERCEPT_FUNCTION(sigaction_symname)
namespace __sanitizer {
int real_sigaction(int signum, const void *act, void *oldact) {
return REAL(sigaction_symname)(signum, (const __sanitizer_sigaction *)act,
(__sanitizer_sigaction *)oldact);
}
} // namespace __sanitizer
#else // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
#define INIT_SIGNAL
#define INIT_SIGACTION
// We need to have defined REAL(sigaction) on other systems.
namespace __sanitizer {
struct __sanitizer_sigaction;
}
DEFINE_REAL(int, sigaction, int signum, const __sanitizer_sigaction *act,
__sanitizer_sigaction *oldact)
#endif // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
static void InitializeSignalInterceptors() {
static bool was_called_once;
CHECK(!was_called_once);
was_called_once = true;
INIT_BSD_SIGNAL;
INIT_SIGNAL;
INIT_SIGACTION;
}
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