compiler-rt/test/asan/TestCases/Linux/preinstalled_signal.cpp

   1 // RUN: %clangxx -std=c++11 %s -o %t
   2 // RUN: %env_asan_opts=handle_segv=1 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
   3 // RUN: %env_asan_opts=handle_segv=2 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
   4
   5 // RUN: %clangxx -std=c++11 -DTEST_INSTALL_SIG_HANDLER %s -o %t
   6 // RUN: %env_asan_opts=handle_segv=0 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-HANDLER
   7 // RUN: %env_asan_opts=handle_segv=1 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
   8 // RUN: %env_asan_opts=handle_segv=2 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
   9
  10 // RUN: %clangxx -std=c++11 -DTEST_INSTALL_SIG_ACTION %s -o %t
  11 // RUN: %env_asan_opts=handle_segv=0 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-ACTION
  12 // RUN: %env_asan_opts=handle_segv=1 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
  13 // RUN: %env_asan_opts=handle_segv=2 LD_PRELOAD=%shared_libasan not %run %t 2>&1 | FileCheck %s
  14
  15 // REQUIRES: asan-dynamic-runtime
  16
  17 // This way of setting LD_PRELOAD does not work with Android test runner.
  18 // REQUIRES: !android
  19
  20 #include <assert.h>
  21 #include <signal.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/syscall.h>
  26 #include <unistd.h>
  27
  28 const char *handler = nullptr;
  29 void SigHandler(int signum) { handler = "TestSigHandler"; }
  30 void SigAction(int, siginfo_t *, void *) { handler = "TestSigAction"; }
  31
  32 struct KernelSigaction {
  33
  34 #if defined(__mips__)
  35   unsigned long flags;
  36   __sighandler_t handler;
  37 #else
  38   __sighandler_t handler;
  39   unsigned long flags;
  40 #endif
  41   void (*restorer)();
  42   char unused[1024];
  43 };
  44
  45 #if defined(__x86_64__)
  46 extern "C" void restorer();
  47 asm("restorer:mov $15,%rax\nsyscall");
  48 #endif
  49
  50 int InternalSigaction(int sig, KernelSigaction *act, KernelSigaction *oact) {
  51   if (act) {
  52 #if defined(__x86_64__)
  53     act->flags |= 0x04000000;
  54     act->restorer = &restorer;
  55 #endif
  56   }
  57   return syscall(__NR_rt_sigaction, sig, act, oact, NSIG / 8);
  58 }
  59
  60 struct KernelSigaction pre_asan = {};
  61
  62 static void Init() {
  63   int res = InternalSigaction(SIGSEGV, nullptr, &pre_asan);
  64   assert(res >= 0);
  65   assert(pre_asan.handler == SIG_DFL || pre_asan.handler == SIG_IGN);
  66 #if defined(TEST_INSTALL_SIG_HANDLER)
  67   pre_asan = {};
  68   pre_asan.handler = &SigHandler;
  69   res = InternalSigaction(SIGSEGV, &pre_asan, nullptr);
  70   assert(res >= 0);
  71 #elif defined(TEST_INSTALL_SIG_ACTION)
  72   pre_asan = {};
  73   pre_asan.flags = SA_SIGINFO | SA_NODEFER;
  74   pre_asan.handler = (__sighandler_t)&SigAction;
  75   res = InternalSigaction(SIGSEGV, &pre_asan, nullptr);
  76   assert(res >= 0);
  77 #endif
  78 }
  79
  80 __attribute__((section(".preinit_array"), used))
  81 void (*__local_test_preinit)(void) = Init;
  82
  83 bool ExpectUserHandler() {
  84 #if defined(TEST_INSTALL_SIG_HANDLER) || defined(TEST_INSTALL_SIG_ACTION)
  85   return !strcmp(getenv("ASAN_OPTIONS"), "handle_segv=0");
  86 #endif
  87   return false;
  88 }
  89
  90 int main(int argc, char *argv[]) {
  91   KernelSigaction post_asan = {};
  92   InternalSigaction(SIGSEGV, nullptr, &post_asan);
  93
  94   assert(post_asan.handler != SIG_DFL);
  95   assert(post_asan.handler != SIG_IGN);
  96   assert(ExpectUserHandler() ==
  97          (post_asan.handler == pre_asan.handler));
  98
  99   raise(SIGSEGV);
 100   printf("%s\n", handler);
 101   return 1;
 102 }
 103
 104 // CHECK-NOT: TestSig
 105 // CHECK: AddressSanitizer:DEADLYSIGNAL
 106
 107 // CHECK-HANDLER-NOT: AddressSanitizer:DEADLYSIGNAL
 108 // CHECK-HANDLER: TestSigHandler
 109
 110 // CHECK-ACTION-NOT: AddressSanitizer:DEADLYSIGNAL
 111 // CHECK-ACTION: TestSigAction