1 // RUN: %clangxx_msan -O0 -g %s -o %t && %run %t 2 // RUN: %clangxx_msan -O3 -g %s -o %t && %run %t 3 4 // RUN: %clangxx_msan -DPOSITIVE -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s 5 // RUN: %clangxx_msan -DPOSITIVE -O3 -g %s -o %t && not %run %t 2>&1 | FileCheck %s 6 7 #include <assert.h> 8 #include <stdlib.h> 9 #include <net/if.h> 10 #include <stdio.h> 11 #include <string.h> 12 #include <sys/ioctl.h> 13 #include <sys/socket.h> 14 #include <unistd.h> 15 16 int main(int argc, char **argv) { 17 int fd = socket(AF_INET, SOCK_STREAM, 0); 18 19 struct ifreq ifreqs[20]; 20 struct ifconf ifc; 21 ifc.ifc_ifcu.ifcu_req = ifreqs; 22 #ifndef POSITIVE 23 ifc.ifc_len = sizeof(ifreqs); 24 #endif 25 int res = ioctl(fd, SIOCGIFCONF, (void *)&ifc); 26 // CHECK: Uninitialized bytes in ioctl{{.*}} at offset 0 inside [0x{{.*}}, 4) 27 // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value 28 // CHECK: #{{.*}} in main {{.*}}ioctl_custom.cc:[[@LINE-3]] 29 assert(res == 0); 30 for (int i = 0; i < ifc.ifc_len / sizeof(*ifc.ifc_ifcu.ifcu_req); ++i) 31 printf("%d %zu %s\n", i, strlen(ifreqs[i].ifr_name), ifreqs[i].ifr_name); 32 return 0; 33 } 34
