// https://syzkaller.appspot.com/bug?id=cdb658d8cbeff62a4d998e94be26bd578507e32c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef __NR_renameat2
#define __NR_renameat2 316
#endif

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  getsockopt$TIPC_DEST_DROPPABLE arguments: [
  //    fd: sock_tipc (resource)
  //    level: const = 0x10f (4 bytes)
  //    opt: const = 0x81 (4 bytes)
  //    val: ptr[out, int32] {
  //      int32 = 0x0 (4 bytes)
  //    }
  //    len: ptr[inout, bytesize] {
  //      bytesize = 0x4 (4 bytes)
  //    }
  //  ]
  NONFAILING(*(uint32_t*)0x2000000000c0 = 4);
  syscall(__NR_getsockopt, /*fd=*/(intptr_t)-1, /*level=*/0x10f, /*opt=*/0x81,
          /*val=*/0x200000000080ul, /*len=*/0x2000000000c0ul);
  //  add_key$user arguments: [
  //    type: ptr[in, buffer] {
  //      buffer: {75 73 65 72 00} (length 0x5)
  //    }
  //    desc: ptr[in, key_desc] {
  //      key_desc {
  //        prefix: buffer: {73 79 7a} (length 0x3)
  //        id: proc = 0xffffffffffffffff (1 bytes)
  //        z: const = 0x0 (1 bytes)
  //      }
  //    }
  //    payload: ptr[in, buffer] {
  //      buffer: {} (length 0x0)
  //    }
  //    paylen: len = 0xc9 (8 bytes)
  //    keyring: keyring (resource)
  //  ]
  //  returns user_key
  NONFAILING(memcpy((void*)0x2000000003c0, "user\000", 5));
  NONFAILING(memcpy((void*)0x200000000440, "syz", 3));
  NONFAILING(*(uint8_t*)0x200000000443 = 0);
  NONFAILING(*(uint8_t*)0x200000000444 = 0);
  syscall(__NR_add_key, /*type=*/0x2000000003c0ul, /*desc=*/0x200000000440ul,
          /*payload=*/0x2000000000c0ul, /*paylen=*/0xc9ul,
          /*keyring=*/0xfffffffd);
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    mode: open_mode = 0x1ff (8 bytes)
  //  ]
  NONFAILING(memcpy((void*)0x200000000440, "./mnt\000", 6));
  syscall(
      __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000440ul,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1fful);
  //  mount arguments: [
  //    src: ptr[in, blockdev_filename] {
  //      union blockdev_filename {
  //        filename: buffer: {00} (length 0x1)
  //      }
  //    }
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {65 63 72 79 70 74 66 73 00} (length 0x9)
  //    }
  //    flags: mount_flags = 0x0 (8 bytes)
  //    data: ptr[in, buffer] {
  //      buffer: {65 63 72 79 70 74 66 73 5f 73 69 67 3d 73 79 7a 2c 65 63 72
  //      79 70 74 66 73 5f 66 6e 65 6b 5f 73 69 67 3d 73 79 7a 2c 65 63 72 79
  //      70 74 66 73 5f 63 69 70 68 65 72 3d 61 65 73 2c 65 63 72 79 70 74 66
  //      73 5f 6b 65 79 5f 62 79 74 65 73 3d 31 36 00} (length 0x51)
  //    }
  //  ]
  NONFAILING(memset((void*)0x200000000400, 0, 1));
  NONFAILING(memcpy((void*)0x200000000000, "./mnt\000", 6));
  NONFAILING(memcpy((void*)0x200000000480, "ecryptfs\000", 9));
  NONFAILING(memcpy((void*)0x200000000500,
                    "ecryptfs_sig=syz,ecryptfs_fnek_sig=syz,ecryptfs_cipher="
                    "aes,ecryptfs_key_bytes=16\000",
                    81));
  syscall(__NR_mount, /*src=*/0x200000000400ul, /*dst=*/0x200000000000ul,
          /*type=*/0x200000000480ul, /*flags=*/0ul, /*data=*/0x200000000500ul);
  //  setsockopt$inet_tcp_TCP_REPAIR arguments: [
  //    fd: sock_tcp (resource)
  //    level: const = 0x6 (4 bytes)
  //    optname: const = 0x2e (4 bytes)
  //    optval: nil
  //    optlen: len = 0x0 (8 bytes)
  //  ]
  syscall(__NR_setsockopt, /*fd=*/(intptr_t)-1, /*level=*/6, /*optname=*/0x2e,
          /*optval=*/0ul, /*optlen=*/0ul);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    flags: open_flags = 0x0 (4 bytes)
  //    mode: open_mode = 0x21 (2 bytes)
  //  ]
  //  returns fd
  NONFAILING(memcpy((void*)0x200000000400, "./mnt\000", 6));
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000400ul,
                /*flags=*/0, /*mode=S_IXOTH|S_IRGRP*/ 0x21);
  if (res != -1)
    r[0] = res;
  //  renameat2 arguments: [
  //    oldfd: fd_dir (resource)
  //    old: ptr[in, buffer] {
  //      buffer: {2e 2f 6d 6e 74 00} (length 0x6)
  //    }
  //    newfd: fd_dir (resource)
  //    new: ptr[in, buffer] {
  //      buffer: {2e 2f 64 65 76 00} (length 0x6)
  //    }
  //    flags: renameat2_flags = 0x4 (8 bytes)
  //  ]
  NONFAILING(memcpy((void*)0x200000000240, "./mnt\000", 6));
  NONFAILING(memcpy((void*)0x200000000280, "./dev\000", 6));
  syscall(__NR_renameat2, /*oldfd=*/r[0], /*old=*/0x200000000240ul,
          /*newfd=*/r[0], /*new=*/0x200000000280ul,
          /*flags=RENAME_WHITEOUT*/ 4ul);
  return 0;
}