src/fuzz/fuzz-journald-native-fd.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "fd-util.h"
   4 #include "fs-util.h"
   5 #include "fuzz-journald.h"
   6 #include "fuzz.h"
   7 #include "journald-native.h"
   8 #include "memfd-util.h"
   9 #include "process-util.h"
  10 #include "tmpfile-util.h"
  11
  12 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  13         Server s;
  14         _cleanup_close_ int sealed_fd = -1, unsealed_fd = -1;
  15         _cleanup_(unlink_tempfilep) char name[] = "/tmp/fuzz-journald-native-fd.XXXXXX";
  16         char *label = NULL;
  17         size_t label_len = 0;
  18         struct ucred ucred;
  19         struct timeval *tv = NULL;
  20
  21         if (!getenv("SYSTEMD_LOG_LEVEL"))
  22                 log_set_max_level(LOG_CRIT);
  23
  24         dummy_server_init(&s, NULL, 0);
  25
  26         sealed_fd = memfd_new(NULL);
  27         assert_se(sealed_fd >= 0);
  28         assert_se(write(sealed_fd, data, size) == (ssize_t) size);
  29         assert_se(memfd_set_sealed(sealed_fd) >= 0);
  30         assert_se(lseek(sealed_fd, 0, SEEK_SET) == 0);
  31         ucred = (struct ucred) {
  32                 .pid = getpid_cached(),
  33                 .uid = geteuid(),
  34                 .gid = getegid(),
  35         };
  36         server_process_native_file(&s, sealed_fd, &ucred, tv, label, label_len);
  37
  38         unsealed_fd = mkostemp_safe(name);
  39         assert_se(unsealed_fd >= 0);
  40         assert_se(write(unsealed_fd, data, size) == (ssize_t) size);
  41         assert_se(lseek(unsealed_fd, 0, SEEK_SET) == 0);
  42         server_process_native_file(&s, unsealed_fd, &ucred, tv, label, label_len);
  43
  44         server_done(&s);
  45
  46         return 0;
  47 }