compiler-rt/test/msan/ioctl_custom.cpp

   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 // Reports different report (not analyzed)
   8 // XFAIL: target={{.*netbsd.*}}
   9
  10 #include <assert.h>
  11 #include <stdlib.h>
  12 #include <net/if.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/socket.h>
  17 #include <unistd.h>
  18
  19 int main(int argc, char **argv) {
  20   int fd = socket(AF_UNIX, SOCK_STREAM, 0);
  21
  22   struct ifreq ifreqs[20];
  23   struct ifconf ifc;
  24   ifc.ifc_ifcu.ifcu_req = ifreqs;
  25 #ifndef POSITIVE
  26   ifc.ifc_len = sizeof(ifreqs);
  27 #endif
  28   int res = ioctl(fd, SIOCGIFCONF, (void *)&ifc);
  29   // CHECK: Uninitialized bytes in ioctl{{.*}} at offset 0 inside [0x{{.*}}, 4)
  30   // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
  31   // CHECK: #{{.*}} in main {{.*}}ioctl_custom.cpp:[[@LINE-3]]
  32   assert(res == 0);
  33   for (int i = 0; i < ifc.ifc_len / sizeof(*ifc.ifc_ifcu.ifcu_req); ++i)
  34     printf("%d  %zu  %s\n", i, strlen(ifreqs[i].ifr_name), ifreqs[i].ifr_name);
  35   return 0;
  36 }