libsanitizer/sanitizer_common/sanitizer_signal_interceptors.inc

   1 //===-- sanitizer_signal_interceptors.inc -----------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Signal interceptors for sanitizers.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "interception/interception.h"
  14 #include "sanitizer_common.h"
  15 #include "sanitizer_internal_defs.h"
  16 #include "sanitizer_platform_interceptors.h"
  17
  18 using namespace __sanitizer;
  19
  20 #if SANITIZER_NETBSD
  21 #define sigaction_symname __sigaction14
  22 #else
  23 #define sigaction_symname sigaction
  24 #endif
  25
  26 #ifndef SIGNAL_INTERCEPTOR_SIGNAL_IMPL
  27 #define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signum, handler) \
  28   { return REAL(func)(signum, handler); }
  29 #endif
  30
  31 #ifndef SIGNAL_INTERCEPTOR_SIGACTION_IMPL
  32 #define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact) \
  33   { return REAL(sigaction_symname)(signum, act, oldact); }
  34 #endif
  35
  36 #if SANITIZER_INTERCEPT_BSD_SIGNAL
  37 INTERCEPTOR(uptr, bsd_signal, int signum, uptr handler) {
  38   if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
  39   SIGNAL_INTERCEPTOR_SIGNAL_IMPL(bsd_signal, signum, handler);
  40 }
  41 #define INIT_BSD_SIGNAL COMMON_INTERCEPT_FUNCTION(bsd_signal)
  42 #else  // SANITIZER_INTERCEPT_BSD_SIGNAL
  43 #define INIT_BSD_SIGNAL
  44 #endif  // SANITIZER_INTERCEPT_BSD_SIGNAL
  45
  46 #if SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
  47 INTERCEPTOR(uptr, signal, int signum, uptr handler) {
  48   if (GetHandleSignalMode(signum) == kHandleSignalExclusive)
  49     return (uptr) nullptr;
  50   SIGNAL_INTERCEPTOR_SIGNAL_IMPL(signal, signum, handler);
  51 }
  52 #define INIT_SIGNAL COMMON_INTERCEPT_FUNCTION(signal)
  53
  54 INTERCEPTOR(int, sigaction_symname, int signum,
  55             const __sanitizer_sigaction *act, __sanitizer_sigaction *oldact) {
  56   if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
  57   SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact);
  58 }
  59 #define INIT_SIGACTION COMMON_INTERCEPT_FUNCTION(sigaction_symname)
  60
  61 namespace __sanitizer {
  62 int real_sigaction(int signum, const void *act, void *oldact) {
  63   return REAL(sigaction_symname)(signum, (const __sanitizer_sigaction *)act,
  64                          (__sanitizer_sigaction *)oldact);
  65 }
  66 }  // namespace __sanitizer
  67 #else  // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
  68 #define INIT_SIGNAL
  69 #define INIT_SIGACTION
  70 // We need to have defined REAL(sigaction) on other systems.
  71 namespace __sanitizer {
  72 struct __sanitizer_sigaction;
  73 }
  74 DEFINE_REAL(int, sigaction, int signum, const __sanitizer_sigaction *act,
  75             __sanitizer_sigaction *oldact)
  76 #endif  // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
  77
  78 static void InitializeSignalInterceptors() {
  79   static bool was_called_once;
  80   CHECK(!was_called_once);
  81   was_called_once = true;
  82
  83   INIT_BSD_SIGNAL;
  84   INIT_SIGNAL;
  85   INIT_SIGACTION;
  86 }