[BUG] KASAN: null-ptr-deref Read in vidtv_psi_ts_psi_write_into

[Jie Zhu]

Hi,

While running a syzkaller fuzzing campaign against Linux mainline I hit
the following crash. I checked syzbot upstream (open / moderation / fixed,
snapshot 2026-06-06) and could not find a matching entry, so I am reporting
it here.

The underlying syzkaller program is also available; happy to send it on
request.

Thanks,
Jie Zhu

Build / environment:

  Tree:      Linus mainline
  HEAD:      27d128c1cff6
             (Linux 7.0.0-g27d128c1cff6)
  Arch:      x86_64
  Compiler:  gcc 12+ (Debian)
  Userspace: Debian bullseye (syzkaller image)
  VM:        QEMU 8.2, 2 vCPU, 4 GB RAM, KVM acceleration

The kernel .config and the full kernel console log are large, so they are
not inlined here per Documentation/admin-guide/reporting-issues.rst. I will
send them in a follow-up reply, or can paste them to a public service if
preferred.

Crash report (symbolicated):

==================================================================
BUG: KASAN: null-ptr-deref in vidtv_psi_ts_psi_write_into+0x2d1/0x5e0
drivers/media/test-drivers/vidtv/vidtv_psi.c:142
Read of size 1 at addr 0000000000000002 by task kworker/0:0/9

CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 7.0.0-g27d128c1cff6
#5 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix,
1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events vidtv_mux_tick
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x10e/0x1f0 lib/dump_stack.c:120
 kasan_report+0xe4/0x120 mm/kasan/report.c:595
 vidtv_psi_ts_psi_write_into+0x2d1/0x5e0
drivers/media/test-drivers/vidtv/vidtv_psi.c:142
 vidtv_psi_table_header_write_into.isra.0+0xde/0x120
drivers/media/test-drivers/vidtv/vidtv_psi.c:744
 vidtv_psi_pmt_write_into+0x244/0x4a0
drivers/media/test-drivers/vidtv/vidtv_psi.c:1176
 vidtv_mux_push_si+0x837/0x8a0 drivers/media/test-drivers/vidtv/vidtv_mux.c:196
 vidtv_mux_tick+0xb0b/0xba0 drivers/media/test-drivers/vidtv/vidtv_mux.c:408
 process_one_work+0x62b/0xfd0 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x3fd/0x7e0 kernel/workqueue.c:3466
 kthread+0x221/0x280 kernel/kthread.c:436
 ret_from_fork+0x899/0x9b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000002
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8000000115a6e067 P4D 8000000115a6e067 PUD 10e6cd067 PMD 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Tainted: G    B
7.0.0-g27d128c1cff6 #5 PREEMPT(full)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix,
1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events vidtv_mux_tick
RIP: 0010:vidtv_psi_ts_psi_write_into+0x2e9/0x5e0
drivers/media/test-drivers/vidtv/vidtv_psi.c:142
Code: fc 48 8b 43 20 48 89 c7 48 89 44 24 30 e8 7f c8 59 fc 48 8b 44
24 30 0f b6 4c 24 6b 4c 89 ee 48 8b 7c 24 08 41 b8 04 00 00 00 <0f> b6
10 89 c8 88 4c 24 30 48 8d 4c 24 68 83 e0 f0 83 e2 0f 09 d0
RSP: 0018:ffffc9000009f428 EFLAGS: 00010286
RAX: 0000000000000002 RBX: ffffc9000009f538 RCX: 0000000000000010
RDX: ffff888101ebd880 RSI: 0000000000000178 RDI: ffffc9000be10000
RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000000 R11: fffffffffffd22f0 R12: ffffc9000009f558
R13: 0000000000000178 R14: 0000000000000000 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8881891d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000116036000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 vidtv_psi_table_header_write_into.isra.0+0xde/0x120
drivers/media/test-drivers/vidtv/vidtv_psi.c:744
 vidtv_psi_pmt_write_into+0x244/0x4a0
drivers/media/test-drivers/vidtv/vidtv_psi.c:1176
 vidtv_mux_push_si+0x837/0x8a0 drivers/media/test-drivers/vidtv/vidtv_mux.c:196
 vidtv_mux_tick+0xb0b/0xba0 drivers/media/test-drivers/vidtv/vidtv_mux.c:408
 process_one_work+0x62b/0xfd0 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x3fd/0x7e0 kernel/workqueue.c:3466
 kthread+0x221/0x280 kernel/kthread.c:436
 ret_from_fork+0x899/0x9b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
CR2: 0000000000000002
---[ end trace 0000000000000000 ]---
RIP: 0010:vidtv_psi_ts_psi_write_into+0x2e9/0x5e0
drivers/media/test-drivers/vidtv/vidtv_psi.c:142
Code: fc 48 8b 43 20 48 89 c7 48 89 44 24 30 e8 7f c8 59 fc 48 8b 44
24 30 0f b6 4c 24 6b 4c 89 ee 48 8b 7c 24 08 41 b8 04 00 00 00 <0f> b6
10 89 c8 88 4c 24 30 48 8d 4c 24 68 83 e0 f0 83 e2 0f 09 d0
RSP: 0018:ffffc9000009f428 EFLAGS: 00010286
RAX: 0000000000000002 RBX: ffffc9000009f538 RCX: 0000000000000010
RDX: ffff888101ebd880 RSI: 0000000000000178 RDI: ffffc9000be10000
RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000000 R11: fffffffffffd22f0 R12: ffffc9000009f558
R13: 0000000000000178 R14: 0000000000000000 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8881891d4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000116036000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
   0: fc                    cld
   1: 48 8b 43 20          mov    0x20(%rbx),%rax
   5: 48 89 c7              mov    %rax,%rdi
   8: 48 89 44 24 30        mov    %rax,0x30(%rsp)
   d: e8 7f c8 59 fc        call   0xfc59c891
  12: 48 8b 44 24 30        mov    0x30(%rsp),%rax
  17: 0f b6 4c 24 6b        movzbl 0x6b(%rsp),%ecx
  1c: 4c 89 ee              mov    %r13,%rsi
  1f: 48 8b 7c 24 08        mov    0x8(%rsp),%rdi
  24: 41 b8 04 00 00 00    mov    $0x4,%r8d
* 2a: 0f b6 10              movzbl (%rax),%edx <-- trapping instruction
  2d: 89 c8                mov    %ecx,%eax
  2f: 88 4c 24 30          mov    %cl,0x30(%rsp)
  33: 48 8d 4c 24 68        lea    0x68(%rsp),%rcx
  38: 83 e0 f0              and    $0xfffffff0,%eax
  3b: 83 e2 0f              and    $0xf,%edx
  3e: 09 d0                or     %edx,%eax

C reproducer:

// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.h>

static void sleep_ms(uint64_t ms)
{
usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
exit(1);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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;
}

struct nlmsg {
char* pos;
int nesting;
struct nlattr* nested[8];
char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
const void* data, int size)
{
memset(nlmsg, 0, sizeof(*nlmsg));
struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
hdr->nlmsg_type = typ;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
memcpy(hdr + 1, data, size);
nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ,
const void* data, int size)
{
struct nlattr* attr = (struct nlattr*)nlmsg->pos;
attr->nla_len = sizeof(*attr) + size;
attr->nla_type = typ;
if (size > 0)
memcpy(attr + 1, data, size);
nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static void netlink_nest(struct nlmsg* nlmsg, int typ)
{
struct nlattr* attr = (struct nlattr*)nlmsg->pos;
attr->nla_type = typ;
nlmsg->pos += sizeof(*attr);
nlmsg->nested[nlmsg->nesting++] = attr;
}

static void netlink_done(struct nlmsg* nlmsg)
{
struct nlattr* attr = nlmsg->nested[--nlmsg->nesting];
attr->nla_len = nlmsg->pos - (char*)attr;
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock,
    uint16_t reply_type, int* reply_len, bool dofail)
{
if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
exit(1);
struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
struct sockaddr_nl addr;
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, (struct
sockaddr*)&addr, sizeof(addr));
if (n != (ssize_t)hdr->nlmsg_len) {
if (dofail)
exit(1);
return -1;
}
n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
if (reply_len)
*reply_len = 0;
if (n < 0) {
if (dofail)
exit(1);
return -1;
}
if (n < (ssize_t)sizeof(struct nlmsghdr)) {
errno = EINVAL;
if (dofail)
exit(1);
return -1;
}
if (hdr->nlmsg_type == NLMSG_DONE)
return 0;
if (reply_len && hdr->nlmsg_type == reply_type) {
*reply_len = n;
return 0;
}
if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
errno = EINVAL;
if (dofail)
exit(1);
return -1;
}
if (hdr->nlmsg_type != NLMSG_ERROR) {
errno = EINVAL;
if (dofail)
exit(1);
return -1;
}
errno = -((struct nlmsgerr*)(hdr + 1))->error;
return -errno;
}

static int netlink_send(struct nlmsg* nlmsg, int sock)
{
return netlink_send_ext(nlmsg, sock, 0, NULL, true);
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock,
const char* family_name, bool dofail)
{
struct genlmsghdr genlhdr;
memset(&genlhdr, 0, sizeof(genlhdr));
genlhdr.cmd = CTRL_CMD_GETFAMILY;
netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name,
strnlen(family_name, GENL_NAMSIZ - 1) + 1);
int n = 0;
int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
if (err < 0) {
return -1;
}
uint16_t id = 0;
struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
NLMSG_ALIGN(sizeof(genlhdr)));
for (; (char*)attr < nlmsg->buf + n; attr = (struct
nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
id = *(uint16_t*)(attr + 1);
break;
}
}
if (!id) {
errno = EINVAL;
return -1;
}
recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
return id;
}

static unsigned int queue_count = 2;

static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
    const char* name, bool up)
{
struct ifinfomsg hdr;
memset(&hdr, 0, sizeof(hdr));
if (up)
hdr.ifi_flags = hdr.ifi_change = IFF_UP;
netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr));
if (name)
netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));
netlink_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count));
netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count));
netlink_nest(nlmsg, IFLA_LINKINFO);
netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
}

static void netlink_device_change(struct nlmsg* nlmsg, int sock, const
char* name, bool up,
  const char* master, const void* mac, int macsize,
  const char* new_name)
{
struct ifinfomsg hdr;
memset(&hdr, 0, sizeof(hdr));
if (up)
hdr.ifi_flags = hdr.ifi_change = IFF_UP;
hdr.ifi_index = if_nametoindex(name);
netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
if (new_name)
netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
if (master) {
int ifindex = if_nametoindex(master);
netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
}
if (macsize)
netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
int err = netlink_send(nlmsg, sock);
if (err < 0) {
}
}

static struct nlmsg nlmsg;

static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
if (a0 == 0xc || a0 == 0xb) {
char buf[128];
sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block",
(uint8_t)a1, (uint8_t)a2);
return open(buf, O_RDWR, 0);
} else {
unsigned long nb = a1;
char buf[1024];
char* hash;
strncpy(buf, (char*)a0, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = 0;
while ((hash = strchr(buf, '#'))) {
*hash = '0' + (char)(nb % 10);
nb /= 10;
}
return open(buf, a2 & ~O_CREAT, 0);
}
}

static int inject_fault(int nth)
{
int fd;
fd = open("/proc/thread-self/fail-nth", O_RDWR);
if (fd == -1)
exit(1);
char buf[16];
sprintf(buf, "%d", nth);
if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
exit(1);
return fd;
}

static void kill_and_wait(int pid, int* status)
{
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
for (int i = 0; i < 100; i++) {
if (waitpid(-1, status, WNOHANG | __WALL) == pid)
return;
usleep(1000);
}
DIR* dir = opendir("/sys/fs/fuse/connections");
if (dir) {
for (;;) {
struct dirent* ent = readdir(dir);
if (!ent)
break;
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
continue;
char abort[300];
snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
ent->d_name);
int fd = open(abort, O_WRONLY);
if (fd == -1) {
continue;
}
if (write(fd, abort, 1) < 0) {
}
close(fd);
}
closedir(dir);
} else {
}
while (waitpid(-1, status, __WALL) != pid) {
}
}

static void setup_test()
{
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
write_file("/proc/self/oom_score_adj", "1000");
}

static const char* setup_fault()
{
int fd = open("/proc/self/make-it-fail", O_WRONLY);
if (fd == -1)
return "CONFIG_FAULT_INJECTION is not enabled";
close(fd);
fd = open("/proc/thread-self/fail-nth", O_WRONLY);
if (fd == -1)
return "kernel does not have systematic fault injection support";
close(fd);
static struct {
const char* file;
const char* val;
bool fatal;
} files[] = {
    {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
    {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
    {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
    {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
    {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
};
unsigned i;
for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
if (!write_file(files[i].file, files[i].val)) {
if (files[i].fatal)
return "failed to write fault injection file";
}
}
return NULL;
}

#define NL802154_CMD_SET_SHORT_ADDR 11
#define NL802154_ATTR_IFINDEX 3
#define NL802154_ATTR_SHORT_ADDR 10

static const char* setup_802154()
{
const char* error = NULL;
int sock_generic = -1;
int sock_route = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (sock_route == -1) {
error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) failed";
goto fail;
}
sock_generic = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
if (sock_generic == -1) {
error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) failed";
goto fail;
}
{
int nl802154_family_id = netlink_query_family_id(&nlmsg, sock_generic,
"nl802154", true);
if (nl802154_family_id < 0) {
error = "netlink_query_family_id failed";
goto fail;
}
for (int i = 0; i < 2; i++) {
char devname[] = "wpan0";
devname[strlen(devname) - 1] += i;
uint64_t hwaddr = 0xaaaaaaaaaaaa0002 + (i << 8);
uint16_t shortaddr = 0xaaa0 + i;
int ifindex = if_nametoindex(devname);
struct genlmsghdr genlhdr;
memset(&genlhdr, 0, sizeof(genlhdr));
genlhdr.cmd = NL802154_CMD_SET_SHORT_ADDR;
netlink_init(&nlmsg, nl802154_family_id, 0, &genlhdr, sizeof(genlhdr));
netlink_attr(&nlmsg, NL802154_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
netlink_attr(&nlmsg, NL802154_ATTR_SHORT_ADDR, &shortaddr, sizeof(shortaddr));
if (netlink_send(&nlmsg, sock_generic) < 0) {
error = "NL802154_CMD_SET_SHORT_ADDR failed";
goto fail;
}
netlink_device_change(&nlmsg, sock_route, devname, true, 0, &hwaddr,
sizeof(hwaddr), 0);
if (i == 0) {
netlink_add_device_impl(&nlmsg, "lowpan", "lowpan0", false);
netlink_done(&nlmsg);
netlink_attr(&nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
if (netlink_send(&nlmsg, sock_route) < 0) {
error = "netlink: adding device lowpan0 type lowpan link wpan0";
goto fail;
}
}
}
}
fail:
close(sock_route);
close(sock_generic);
return error;
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
int iter = 0;
for (;; iter++) {
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
setup_test();
execute_one();
exit(0);
}
int status = 0;
uint64_t start = current_time_ms();
for (;;) {
sleep_ms(10);
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
break;
if (current_time_ms() - start < 5000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
intptr_t res = 0;
if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {}
//  syz_open_dev$dvb_demux arguments: [
//    dev: ptr[in, buffer] {
//      buffer: {2f 64 65 76 2f 64 76 62 2f 61 64 61 70 74 65 72 23 2f
64 65 6d 75 78 23 00} (length 0x19)
//    }
//    id: intptr = 0x0 (8 bytes)
//    flags: open_flags = 0x20000 (8 bytes)
//  ]
//  returns fd_dvb_demux
memcpy((void*)0x200000000000, "/dev/dvb/adapter#/demux#\000", 25);
res = -1;
res = syz_open_dev(/*dev=*/0x200000000000, /*id=*/0,
/*flags=O_NOFOLLOW*/0x20000);
if (res != -1)
r[0] = res;
//  ioctl$DVB_DEMUX_DMX_SET_FILTER arguments: [
//    fd: fd_dvb_demux (resource)
//    cmd: const = 0x403c6f2b (4 bytes)
//    arg: ptr[in, dmx_sct_filter_params] {
//      dmx_sct_filter_params {
//        pid: int16 = 0x81 (2 bytes)
//        filter: dmx_filter {
//          filter: buffer: {45 d8 98 5d f0 f8 8f c7 19 b5 28 4d 86 2d
a1 94} (length 0x10)
//          mask: buffer: {f4 f3 12 a2 c0 81 eb 50 6a 3b a3 bb 2a 62
29 99} (length 0x10)
//          mode: buffer: {e8 00 00 00 40 00 00 00 00 00 00 00 00 00
00 00} (length 0x10)
//        }
//        pad = 0x0 (2 bytes)
//        timeout: int32 = 0x5 (4 bytes)
//        flags: dmx_sct_filter_flags = 0x4 (4 bytes)
//      }
//    }
//  ]
*(uint16_t*)0x200000000080 = 0x81;
memcpy((void*)0x200000000082,
"\x45\xd8\x98\x5d\xf0\xf8\x8f\xc7\x19\xb5\x28\x4d\x86\x2d\xa1\x94",
16);
memcpy((void*)0x200000000092,
"\xf4\xf3\x12\xa2\xc0\x81\xeb\x50\x6a\x3b\xa3\xbb\x2a\x62\x29\x99",
16);
memcpy((void*)0x2000000000a2,
"\xe8\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
16);
*(uint32_t*)0x2000000000b4 = 5;
*(uint32_t*)0x2000000000b8 = 4;
inject_fault(77);
syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x403c6f2b, /*arg=*/0x200000000080ul);

}
int main(void)
{
syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul,
/*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul,
/*fd=*/(intptr_t)-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*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=*/0x200001000000ul, /*len=*/0x1000ul,
/*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul,
/*fd=*/(intptr_t)-1, /*offset=*/0ul);
const char* reason;
(void)reason;
if ((reason = setup_fault()))
printf("the reproducer may not work as expected: fault injection setup
failed: %s\n", reason);
if ((reason = setup_802154()))
printf("the reproducer may not work as expected: 802154 injection
setup failed: %s\n", reason);
loop();
return 0;
}