1 // Regression test for 2 // https://code.google.com/p/address-sanitizer/issues/detail?id=180 3 4 // RUN: %clangxx -O0 %s -o %t 5 6 // RUN: %env_tool_opts=handle_segv=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK0 7 // RUN: %env_tool_opts=handle_segv=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK1 8 // RUN: %env_tool_opts=handle_segv=2 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2 9 10 // RUN: %env_tool_opts=handle_segv=0:allow_user_segv_handler=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK0 11 // RUN: %env_tool_opts=handle_segv=1:allow_user_segv_handler=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2 12 // RUN: %env_tool_opts=handle_segv=2:allow_user_segv_handler=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2 13 14 // RUN: %env_tool_opts=handle_segv=0:allow_user_segv_handler=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK0 15 // RUN: %env_tool_opts=handle_segv=1:allow_user_segv_handler=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK1 16 // RUN: %env_tool_opts=handle_segv=2:allow_user_segv_handler=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK2 17 18 // Flaky errors in debuggerd with "waitpid returned unexpected pid (0)" in logcat. 19 // UNSUPPORTED: android && i386-target-arch 20 21 #include <signal.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 25 struct sigaction original_sigaction_sigbus; 26 struct sigaction original_sigaction_sigsegv; 27 28 void User_OnSIGSEGV(int signum, siginfo_t *siginfo, void *context) { 29 fprintf(stderr, "User sigaction called\n"); 30 struct sigaction original_sigaction = {}; 31 if (signum == SIGBUS) 32 original_sigaction = original_sigaction_sigbus; 33 else if (signum == SIGSEGV) 34 original_sigaction = original_sigaction_sigsegv; 35 else { 36 printf("Invalid signum"); 37 exit(1); 38 } 39 if (original_sigaction.sa_flags | SA_SIGINFO) { 40 if (original_sigaction.sa_sigaction) 41 original_sigaction.sa_sigaction(signum, siginfo, context); 42 } else { 43 if (original_sigaction.sa_handler) 44 original_sigaction.sa_handler(signum); 45 } 46 exit(1); 47 } 48 49 int DoSEGV() { 50 volatile int *x = 0; 51 return *x; 52 } 53 54 bool InstallHandler(int signum, struct sigaction *original_sigaction) { 55 struct sigaction user_sigaction = {}; 56 user_sigaction.sa_sigaction = User_OnSIGSEGV; 57 user_sigaction.sa_flags = SA_SIGINFO; 58 if (sigaction(signum, &user_sigaction, original_sigaction)) { 59 perror("sigaction"); 60 return false; 61 } 62 return true; 63 } 64 65 int main() { 66 // Let's install handlers for both SIGSEGV and SIGBUS, since pre-Yosemite 67 // 32-bit Darwin triggers SIGBUS instead. 68 if (InstallHandler(SIGSEGV, &original_sigaction_sigsegv) && 69 InstallHandler(SIGBUS, &original_sigaction_sigbus)) { 70 fprintf(stderr, "User sigaction installed\n"); 71 } 72 return DoSEGV(); 73 } 74 75 // CHECK0-NOT: Sanitizer:DEADLYSIGNAL 76 // CHECK0-NOT: Sanitizer: SEGV on unknown address 77 // CHECK0: User sigaction installed 78 // CHECK0-NEXT: User sigaction called 79 80 // CHECK1: User sigaction installed 81 // CHECK1-NEXT: User sigaction called 82 // CHECK1-NEXT: Sanitizer:DEADLYSIGNAL 83 // CHECK1: Sanitizer: SEGV on unknown address 84 85 // CHECK2-NOT: User sigaction called 86 // CHECK2: User sigaction installed 87 // CHECK2-NEXT: Sanitizer:DEADLYSIGNAL 88 // CHECK2: Sanitizer: SEGV on unknown address 89