49 lines · cpp
1// Check that stores in signal handlers are not recorded in origin history.2//3// Origin tracking uses ChainedOriginDepot that is not async signal safe, so we4// do not track origins inside signal handlers.5//6// RUN: %clangxx_dfsan -gmlt -mllvm -dfsan-track-origins=1 %s -o %t && \7// RUN: %run %t >%t.out 2>&18// RUN: FileCheck %s < %t.out9//10// RUN: %clangxx_dfsan -gmlt -mllvm -dfsan-instrument-with-call-threshold=0 -mllvm -dfsan-track-origins=1 %s -o %t && \11// RUN: %run %t >%t.out 2>&112// RUN: FileCheck %s < %t.out13 14#include <sanitizer/dfsan_interface.h>15 16#include <signal.h>17#include <string.h>18#include <sys/types.h>19#include <unistd.h>20 21int x, y, u;22 23void SignalHandler(int signo) {24 y = x;25 memcpy(&u, &y, sizeof(int));26}27 28int main(int argc, char *argv[]) {29 int z = 0;30 dfsan_set_label(8, &z, sizeof(z));31 x = z;32 33 signal(SIGHUP, SignalHandler);34 kill(getpid(), SIGHUP);35 signal(SIGHUP, SIG_DFL);36 37 dfsan_print_origin_trace(&u, nullptr);38 return 0;39}40 41// CHECK: Taint value 0x8 {{.*}} origin tracking ()42// CHECK: Origin value: {{.*}}, Taint value was stored to memory at43// CHECK-NOT: {{.*}} in SignalHandler.dfsan {{.*}}origin_with_signals.cpp{{.*}}44 45// CHECK: #0 {{.*}} in main {{.*}}origin_with_signals.cpp:[[@LINE-14]]46 47// CHECK: Origin value: {{.*}}, Taint value was created at48// CHECK: #0 {{.*}} in main {{.*}}origin_with_signals.cpp:[[@LINE-18]]49