lib/msan/lit_tests/ioctl_custom.cc

   1 // RUN: %clangxx_msan -m64 -O0 -g %s -o %t && %t
   2 // RUN: %clangxx_msan -m64 -O3 -g %s -o %t && %t
   3
   4 // RUN: %clangxx_msan -DPOSITIVE -m64 -O0 -g %s -o %t && not %t 2>&1 | FileCheck %s
   5 // RUN: %clangxx_msan -DPOSITIVE -m64 -O3 -g %s -o %t && not %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: UMR in ioctl{{.*}} at offset 0
  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 }