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98 lines
3.5 KiB
C++
98 lines
3.5 KiB
C++
//===-- sanitizer_signal_interceptors.inc -----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Signal interceptors for sanitizers.
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//
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//===----------------------------------------------------------------------===//
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#include "interception/interception.h"
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#include "sanitizer_common.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_platform_interceptors.h"
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using namespace __sanitizer;
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#if SANITIZER_NETBSD
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#define sigaction_symname __sigaction14
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#else
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#define sigaction_symname sigaction
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#endif
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#ifndef SIGNAL_INTERCEPTOR_SIGNAL_IMPL
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#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signum, handler) \
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{ return REAL(func)(signum, handler); }
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#endif
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#ifndef SIGNAL_INTERCEPTOR_SIGACTION_IMPL
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# define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact) \
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{ \
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if (!REAL(sigaction_symname)) { \
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Printf( \
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"Warning: REAL(sigaction_symname) == nullptr. This may happen " \
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"if you link with ubsan statically. Sigaction will not work.\n"); \
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return -1; \
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} \
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return REAL(sigaction_symname)(signum, act, oldact); \
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}
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#endif
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#if SANITIZER_INTERCEPT_BSD_SIGNAL
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INTERCEPTOR(uptr, bsd_signal, int signum, uptr handler) {
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if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
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SIGNAL_INTERCEPTOR_SIGNAL_IMPL(bsd_signal, signum, handler);
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}
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#define INIT_BSD_SIGNAL COMMON_INTERCEPT_FUNCTION(bsd_signal)
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#else // SANITIZER_INTERCEPT_BSD_SIGNAL
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#define INIT_BSD_SIGNAL
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#endif // SANITIZER_INTERCEPT_BSD_SIGNAL
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#if SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
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INTERCEPTOR(uptr, signal, int signum, uptr handler) {
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if (GetHandleSignalMode(signum) == kHandleSignalExclusive)
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return (uptr) nullptr;
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SIGNAL_INTERCEPTOR_SIGNAL_IMPL(signal, signum, handler);
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}
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#define INIT_SIGNAL COMMON_INTERCEPT_FUNCTION(signal)
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INTERCEPTOR(int, sigaction_symname, int signum,
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const __sanitizer_sigaction *act, __sanitizer_sigaction *oldact) {
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if (GetHandleSignalMode(signum) == kHandleSignalExclusive) {
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if (!oldact) return 0;
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act = nullptr;
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}
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SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact);
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}
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#define INIT_SIGACTION COMMON_INTERCEPT_FUNCTION(sigaction_symname)
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namespace __sanitizer {
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int real_sigaction(int signum, const void *act, void *oldact) {
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return REAL(sigaction_symname)(signum, (const __sanitizer_sigaction *)act,
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(__sanitizer_sigaction *)oldact);
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}
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} // namespace __sanitizer
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#else // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
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#define INIT_SIGNAL
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#define INIT_SIGACTION
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// We need to have defined REAL(sigaction) on other systems.
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namespace __sanitizer {
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struct __sanitizer_sigaction;
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}
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DEFINE_REAL(int, sigaction, int signum, const __sanitizer_sigaction *act,
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__sanitizer_sigaction *oldact)
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#endif // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
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static void InitializeSignalInterceptors() {
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static bool was_called_once;
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CHECK(!was_called_once);
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was_called_once = true;
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INIT_BSD_SIGNAL;
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INIT_SIGNAL;
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INIT_SIGACTION;
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}
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