// Copyright 2019 Google LLC // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // A binary that crashes, either directly or by copying and re-executing, // to test the stack tracing symbolizer. #include #include #include #include #include #include #include "absl/base/attributes.h" #include "absl/strings/numbers.h" #include "sandboxed_api/util/raw_logging.h" #include "sandboxed_api/util/temp_file.h" ABSL_ATTRIBUTE_NOINLINE void CrashMe() { char* null = reinterpret_cast(0); *null = 0; } void RunWritable() { int exe_fd = open("/proc/self/exe", O_RDONLY); SAPI_RAW_PCHECK(exe_fd >= 0, "Opening /proc/self/exe"); std::string tmpname; int tmp_fd; std::tie(tmpname, tmp_fd) = sapi::CreateNamedTempFile("tmp").value(); SAPI_RAW_PCHECK(fchmod(tmp_fd, S_IRWXU) == 0, "Fchmod on temporary file"); char buf[4096]; while (true) { ssize_t read_cnt = read(exe_fd, buf, sizeof(buf)); SAPI_RAW_PCHECK(read_cnt >= 0, "Reading /proc/self/exe"); if (read_cnt == 0) { break; } SAPI_RAW_PCHECK(write(tmp_fd, buf, read_cnt) == read_cnt, "Writing temporary file"); } SAPI_RAW_PCHECK(close(tmp_fd) == 0, "Closing temporary file"); tmp_fd = open(tmpname.c_str(), O_RDONLY); SAPI_RAW_PCHECK(tmp_fd >= 0, "Reopening temporary file"); char prog_name[] = "crashme"; char testno[] = "1"; char* argv[] = {prog_name, testno, nullptr}; SAPI_RAW_PCHECK(execv(tmpname.c_str(), argv) == 0, "Executing copied binary"); } int main(int argc, char** argv) { if (argc < 2) { printf("argc < 3\n"); return EXIT_FAILURE; } int testno; SAPI_RAW_CHECK(absl::SimpleAtoi(argv[1], &testno), "testno not a number"); switch (testno) { case 1: CrashMe(); break; case 2: RunWritable(); break; default: printf("Unknown test: %d\n", testno); return EXIT_FAILURE; } printf("OK: All tests went OK\n"); return EXIT_SUCCESS; }