// https://syzkaller.appspot.com/bug?id=945f0ebc860be1240232847ebef63d33de55aade
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include <linux/capability.h>

#ifndef __NR_fcntl
#define __NR_fcntl 25
#endif
#ifndef __NR_ftruncate
#define __NR_ftruncate 46
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 29
#endif
#ifndef __NR_madvise
#define __NR_madvise 233
#endif
#ifndef __NR_memfd_create
#define __NR_memfd_create 279
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

#define MAX_FDS 30

static void setup_gadgetfs();
static void setup_binderfs();
static void setup_fusectl();
static void sandbox_common_mount_tmpfs(void)
{
  write_file("/proc/sys/fs/mount-max", "100000");
  if (mkdir("./syz-tmp", 0777))
    exit(1);
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot", 0777))
    exit(1);
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    exit(1);
  unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    exit(1);
  if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL))
    exit(1);
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    exit(1);
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) {
    if (errno != ENOENT)
      exit(1);
    if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) &&
        errno != ENOENT)
      exit(1);
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    exit(1);
  if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL))
    exit(1);
  if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL,
            bind_mount_flags, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mount("/proc/sys/fs/binfmt_misc",
            "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags,
            NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/newroot/syz-inputs", 0700))
    exit(1);
  if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL,
            bind_mount_flags | MS_RDONLY, NULL) &&
      errno != ENOENT)
    exit(1);
  if (mkdir("./syz-tmp/pivot", 0777))
    exit(1);
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      exit(1);
  } else {
    if (chdir("/"))
      exit(1);
    if (umount2("./pivot", MNT_DETACH))
      exit(1);
  }
  if (chroot("./newroot"))
    exit(1);
  if (chdir("/"))
    exit(1);
  setup_gadgetfs();
  setup_binderfs();
  setup_fusectl();
}

static void setup_gadgetfs()
{
  if (mkdir("/dev/gadgetfs", 0777)) {
  }
  if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) {
  }
}

static void setup_fusectl()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void setup_binderfs()
{
  if (mkdir("/dev/binderfs", 0777)) {
  }
  if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) {
  }
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  if (getppid() == 1)
    exit(1);
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

static int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
  sandbox_common_mount_tmpfs();
  loop();
  exit(1);
}

static void close_fds()
{
  for (int fd = 3; fd < MAX_FDS; fd++)
    close(fd);
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$udambuf arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 75 64 6d 61 62 75 66 00} (length 0xd)
  //    }
  //    flags: const = 0x2 (4 bytes)
  //  ]
  //  returns fd_udambuf
  memcpy((void*)0x20000100, "/dev/udmabuf\000", 13);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000100ul,
                /*flags=*/2, 0);
  if (res != -1)
    r[0] = res;
  //  memfd_create arguments: [
  //    name: ptr[in, buffer] {
  //      buffer: {79 10 35 fb f7 75 83 25 3a 72 c2 b8 78 a4 71 c1 ea 5f 8c 5a
  //      37 e7 61 de 6e 4a eb 87 9b 11 78 0e a1 cf 1a 98 53 37 c9 00 00 00 00
  //      00 00 07 00 00 00 00 00 00 04 87 39 a2 34 a9 61 6d de b2 d3 cb 5a 4a
  //      6f 61 c4 1a 63 42 aa c1 fb 20 51 d4 f4 01 a5 32 e2 44 47 d4 bd 7b 9f
  //      a9 97 9b 40 db 00 62 e1 62 72 b6 00 38 e3 10 ff c2 9d 0d 32 9e 8e 04
  //      73 57 1b b7 b3 a2 c9 26 40 ca da dc e2 2f 97 58 ac 08 b0 c2 3c 80 45
  //      1a bc c7 57 da 39 56 73 41 af c6 cf e1 a1 b5 4d a2 85 a6 f7 fc 44 95
  //      e3 eb c7 bc 91 b0 00 00 00 00 00 00 00 07 01 76 52 6b aa 63 42 14 4f
  //      44 5c e8 52 e4 cd ec cc d1 0f 72 65 e8 36 cd eb c4 24 98 06 4a d6 64
  //      44 8d 5f 55 60 1e 0e f6 80 86 d4 00 33 3f 44 6a 69 7b ab 97 af 3b 6c
  //      1f af b3 38 14 cb fa b3 6a 92 0c e0 81 a0 a2 2d 67 08 99 0e 8d 8d 16
  //      99 b1 03 8a 6d b8 aa 1f 27 93 ef 1d a0 48 d9 bd d9 af 00 00 00 00 e4
  //      c2 4d 52 af 07 14 6a 1a 58 d7 19 29 6d 78 3e c2 e3 e8 ca 88 db bf 9b
  //      25 f2 35 48 61 d6 12 09 2e 64 47 6e 56 d6 8c 38 39 2e c9 b1 c7 da b1
  //      ea 37 0d f2 75 21 ad db 43 56 6e d2 0c 30 ae 88 9e 34 44 21 c1 6e 71
  //      da 40 16 00 b4 99 49 cf 8a 62 4b dc 20 29 19 b3 da 8c 15 1d c1 f7 98
  //      de 4f 40 59 38 2d e5 a3 4c 4c 6c} (length 0x178)
  //    }
  //    flags: memfd_flags = 0x2 (8 bytes)
  //  ]
  //  returns fd_memfd
  memcpy(
      (void*)0x200001c0,
      "y\0205\373\367u\203%:r\302\270x\244q\301\352_"
      "\214Z7\347a\336nJ\353\207\233\021x\016\241\317\032\230S7\311\000\000\000"
      "\000\000\000\a\000\000\000\000\000\000\004\2079\2424\251am\336\262\323"
      "\313ZJoa\304\032cB\252\301\373 "
      "Q\324\364\001\2452\342DG\324\275{\237\251\227\233@"
      "\333\000b\341br\266\0008\343\020\377\302\235\r2\236\216\004sW\033\267"
      "\263\242\311&@\312\332\334\342/"
      "\227X\254\b\260\302<"
      "\200E\032\274\307W\3329VsA\257\306\317\341\241\265M\242\205\246\367\374D"
      "\225\343\353\307\274\221\260\000\000\000\000\000\000\000\a\001vRk\252cB"
      "\024OD\\\350R\344\315\354\314\321\017re\3506\315\353\304$"
      "\230\006J\326dD\215_U`\036\016\366\200\206\324\0003?Dji{\253\227\257;"
      "l\037\257\2638\024\313\372\263j\222\f\340\201\240\242-"
      "g\b\231\016\215\215\026\231\261\003\212m\270\252\037\'\223\357\035\240H"
      "\331\275\331\257\000\000\000\000\344\302MR\257\a\024j\032X\327\031)mx>"
      "\302\343\350\312\210\333\277\233%\3625Ha\326\022\t.dGnV\326\21489."
      "\311\261\307\332\261\3527\r\362u!\255\333CVn\322\f0\256\210\2364D!"
      "\301nq\332@\026\000\264\231I\317\212bK\334 "
      ")\031\263\332\214\025\035\301\367\230\336O@Y8-\345\243LLl",
      376);
  res = syscall(__NR_memfd_create, /*name=*/0x200001c0ul,
                /*flags=MFD_ALLOW_SEALING*/ 2ul);
  if (res != -1)
    r[1] = res;
  //  ftruncate arguments: [
  //    fd: fd (resource)
  //    len: intptr = 0xffff (8 bytes)
  //  ]
  syscall(__NR_ftruncate, /*fd=*/r[1], /*len=*/0xfffful);
  //  fcntl$addseals arguments: [
  //    fd: fd (resource)
  //    cmd: const = 0x409 (8 bytes)
  //    seals: seal_types = 0x7 (8 bytes)
  //  ]
  syscall(__NR_fcntl, /*fd=*/r[1], /*cmd=*/0x409ul,
          /*seals=F_SEAL_GROW|F_SEAL_SHRINK|F_SEAL_SEAL*/ 7ul);
  //  ioctl$UDMABUF_CREATE arguments: [
  //    fd: fd_udambuf (resource)
  //    cmd: const = 0x40187542 (4 bytes)
  //    arg: ptr[in, udmabuf_create] {
  //      udmabuf_create {
  //        memfd: fd_memfd (resource)
  //        flags: int32 = 0x0 (4 bytes)
  //        offset: udmabuf_offset_size = 0x0 (8 bytes)
  //        size: udmabuf_offset_size = 0x4000 (8 bytes)
  //      }
  //    }
  //  ]
  //  returns fd_dma_buf
  *(uint32_t*)0x20000140 = r[1];
  *(uint32_t*)0x20000144 = 0;
  *(uint64_t*)0x20000148 = 0;
  *(uint64_t*)0x20000150 = 0x4000;
  res = syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40187542,
                /*arg=*/0x20000140ul);
  if (res != -1)
    r[2] = res;
  //  mmap arguments: [
  //    addr: VMA[0x3000]
  //    len: len = 0x3000 (8 bytes)
  //    prot: mmap_prot = 0x3000007 (8 bytes)
  //    flags: mmap_flags = 0x11 (8 bytes)
  //    fd: fd (resource)
  //    offset: intptr = 0x0 (8 bytes)
  //  ]
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x3000ul,
          /*prot=PROT_GROWSUP|PROT_GROWSDOWN|PROT_WRITE|PROT_READ|PROT_EXEC*/
          0x3000007ul, /*flags=MAP_FIXED|MAP_SHARED*/ 0x11ul, /*fd=*/r[2],
          /*offset=*/0ul);
  //  madvise arguments: [
  //    addr: VMA[0x800000]
  //    len: len = 0x800000 (8 bytes)
  //    advice: madvise_flags = 0x17 (8 bytes)
  //  ]
  syscall(__NR_madvise, /*addr=*/0x20000000ul, /*len=*/0x800000ul,
          /*advice=MADV_POPULATE_WRITE*/ 0x17ul);
  close_fds();
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*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=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  do_sandbox_none();
  return 0;
}