1377179396
Currently if a program calls sigaction very early (before non-lazy sanitizer initialization, in particular if .preinit_array initialization is not enabled), then sigaction will wrongly fail since the interceptor is not initialized yet. In all other interceptors we do lazy runtime initialization for this reason, but we don't do it in the signal interceptors. Do lazy runtime initialization in signal interceptors as well. Reviewed By: melver Differential Revision: https://reviews.llvm.org/D155188
101 lines
3.6 KiB
C++
101 lines
3.6 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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SIGNAL_INTERCEPTOR_ENTER();
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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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SIGNAL_INTERCEPTOR_ENTER();
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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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SIGNAL_INTERCEPTOR_ENTER();
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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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