Hello,
syzbot found the following issue on:
HEAD commit: 42234a752679 Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1351201b280000
kernel config: https://syzkaller.appspot.com/x/.config?x=e95897d034d60fb8
dashboard link: https://syzkaller.appspot.com/bug?extid=c689847e27e0fa3e7a5d
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f608eaee38d2/disk-42234a75.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/266fc376435a/vmlinux-42234a75.xz
kernel image: https://storage.googleapis.com/syzbot-assets/464f23f26a65/Image-42234a75.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 7887 at lib/refcount.c:25 refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25
Modules linked in:
CPU: 0 PID: 7887 Comm: kworker/0:9 Not tainted 6.4.0-rc7-syzkaller-g42234a752679 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events sco_sock_timeout
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25
lr : refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25
sp : ffff800099ca7af0
x29: ffff800099ca7af0 x28: ffff0001b423c600 x27: ffff0000d2d42218
x26: ffff0000cb783250 x25: 1fffe0001a5a8443 x24: dfff800000000000
x23: dfff800000000000 x22: 0000000000000000 x21: 0000000000000002
x20: ffff0000dd30a080 x19: ffff800090b09000 x18: ffff800099ca6fc0
x17: 0000000000000000 x16: ffff80008a443320 x15: 0000000000000003
x14: 0000000000000000 x13: fffffffffffdc038 x12: 0000000000000001
x11: 0000000000000001 x10: 0000000000000000 x9 : fd2dea7152733000
x8 : fd2dea7152733000 x7 : fffffffffffdc038 x6 : fffffffffffdbfe8
x5 : ffff800099ca73d8 x4 : ffff80008df78f00 x3 : ffff800080597614
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000
Call trace:
refcount_warn_saturate+0x1a8/0x20c lib/refcount.c:25
__refcount_inc include/linux/refcount.h:250 [inline]
refcount_inc include/linux/refcount.h:267 [inline]
sock_hold include/net/sock.h:777 [inline]
sco_sock_timeout+0x19c/0x25c net/bluetooth/sco.c:89
process_one_work+0x788/0x12d4 kernel/workqueue.c:2405
worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552
kthread+0x288/0x310 kernel/kthread.c:379
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853
irq event stamp: 183728
hardirqs last enabled at (183727): [<ffff800080351108>] __up_console_sem+0x60/0xb4 kernel/printk/printk.c:347
hardirqs last disabled at (183728): [<ffff80008a43ed34>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:407
softirqs last enabled at (183698): [<ffff8000803a4f6c>] local_bh_enable+0xc/0x2c include/linux/bottom_half.h:32
softirqs last disabled at (183694): [<ffff8000803a4f40>] local_bh_disable+0xc/0x2c include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 PID: 7887 Comm: kworker/0:9 Tainted: G W 6.4.0-rc7-syzkaller-g42234a752679 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events sco_sock_timeout
Call trace:
dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
dump_stack+0x1c/0x28 lib/dump_stack.c:113
assign_lock_key+0x234/0x268 kernel/locking/lockdep.c:982
register_lock_class+0x144/0x6a4 kernel/locking/lockdep.c:1295
__lock_acquire+0x184/0x7604 kernel/locking/lockdep.c:4965
lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5705
lock_sock_nested+0x5c/0x11c net/core/sock.c:3469
lock_sock include/net/sock.h:1709 [inline]
sco_sock_timeout+0xbc/0x25c net/bluetooth/sco.c:97
process_one_work+0x788/0x12d4 kernel/workqueue.c:2405
worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552
kthread+0x288/0x310 kernel/kthread.c:379
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853
==================================================================
BUG: KASAN: slab-out-of-bounds in sco_sock_timeout+0xe8/0x25c net/bluetooth/sco.c:99
Read of size 8 at addr ffff0000dd30a4a0 by task kworker/0:9/7887
CPU: 0 PID: 7887 Comm: kworker/0:9 Tainted: G W 6.4.0-rc7-syzkaller-g42234a752679 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events sco_sock_timeout
Call trace:
dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:351 [inline]
print_report+0x174/0x514 mm/kasan/report.c:462
kasan_report+0xd4/0x130 mm/kasan/report.c:572
__asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
sco_sock_timeout+0xe8/0x25c net/bluetooth/sco.c:99
process_one_work+0x788/0x12d4 kernel/workqueue.c:2405
worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552
kthread+0x288/0x310 kernel/kthread.c:379
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853
Allocated by task 25544:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4c/0x7c mm/kasan/common.c:52
kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:510
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:196 [inline]
__do_kmalloc_node mm/slab_common.c:966 [inline]
__kmalloc+0xcc/0x1b8 mm/slab_common.c:979
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:680 [inline]
ops_init+0x90/0x548 net/core/net_namespace.c:126
setup_net+0x424/0xaac net/core/net_namespace.c:339
copy_net_ns+0x3c4/0x644 net/core/net_namespace.c:491
create_new_namespaces+0x344/0x614 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x108/0x158 kernel/nsproxy.c:228
ksys_unshare+0x45c/0x874 kernel/fork.c:3441
__do_sys_unshare kernel/fork.c:3512 [inline]
__se_sys_unshare kernel/fork.c:3510 [inline]
__arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3510
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191
el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
Last potentially related work creation:
kasan_save_stack+0x40/0x6c mm/kasan/common.c:45
__kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:491
kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:501
__call_rcu_common kernel/rcu/tree.c:2627 [inline]
call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2741
netlink_release+0x12c0/0x1818 net/netlink/af_netlink.c:828
__sock_release net/socket.c:653 [inline]
sock_release+0x84/0x140 net/socket.c:681
netlink_kernel_release+0x50/0x70 net/netlink/af_netlink.c:2098
nfnetlink_net_exit_batch+0x6c/0xb4 net/netfilter/nfnetlink.c:782
ops_exit_list net/core/net_namespace.c:175 [inline]
cleanup_net+0x5dc/0x8d0 net/core/net_namespace.c:614
process_one_work+0x788/0x12d4 kernel/workqueue.c:2405
worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552
kthread+0x288/0x310 kernel/kthread.c:379
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853
Second to last potentially related work creation:
kasan_save_stack+0x40/0x6c mm/kasan/common.c:45
__kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:491
kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:501
__call_rcu_common kernel/rcu/tree.c:2627 [inline]
call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2741
netlink_release+0x12c0/0x1818 net/netlink/af_netlink.c:828
__sock_release net/socket.c:653 [inline]
sock_close+0xb8/0x1fc net/socket.c:1397
__fput+0x30c/0x7bc fs/file_table.c:321
____fput+0x20/0x30 fs/file_table.c:349
task_work_run+0x230/0x2e0 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x63c/0x1f58 kernel/exit.c:874
do_group_exit+0x194/0x22c kernel/exit.c:1024
get_signal+0x14b0/0x159c kernel/signal.c:2876
do_signal arch/arm64/kernel/signal.c:1249 [inline]
do_notify_resume+0x3cc/0x3c90 arch/arm64/kernel/signal.c:1302
exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline]
el0_svc+0x94/0x160 arch/arm64/kernel/entry-common.c:648
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
The buggy address belongs to the object at ffff0000dd30a000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes to the right of
allocated 1056-byte region [ffff0000dd30a000, ffff0000dd30a420)
The buggy address belongs to the physical page:
page:0000000078acc899 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11d308
head:0000000078acc899 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000010200 ffff0000c0002900 fffffc00035a2400 dead000000000002
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000dd30a380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff0000dd30a400: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000dd30a480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff0000dd30a500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000dd30a580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Mem abort info:
ESR = 0x0000000086000006
EC = 0x21: IABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
user pgtable: 4k pages, 48-bit VAs, pgdp=00000001662e9000
[0000000000000000] pgd=080000011715b003, p4d=080000011715b003, pud=0000000000000000
Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 7887 Comm: kworker/0:9 Tainted: G B W 6.4.0-rc7-syzkaller-g42234a752679 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events sco_sock_timeout
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0x0
lr : sco_sock_timeout+0xf4/0x25c net/bluetooth/sco.c:99
sp : ffff800099ca7b20
x29: ffff800099ca7b20 x28: ffff0001b423c600 x27: ffff0000d2d42218
x26: ffff0000cb783250 x25: 1fffe0001a5a8443 x24: dfff800000000000
x23: dfff800000000000 x22: 0000000000000000 x21: ffff0000cb783208
x20: ffff0000dd30a000 x19: ffff0000dd30a080 x18: 1fffe000368447c6
x17: ffff80008debd000 x16: ffff80008a441e20 x15: 0000000000000002
x14: 0000000000000000 x13: 0000000040000002 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 1fffe000368447c7 x6 : ffff80008028cc04
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000801b9aec
x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffff0000dd30a000
Call trace:
0x0
process_one_work+0x788/0x12d4 kernel/workqueue.c:2405
worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552
kthread+0x288/0x310 kernel/kthread.c:379
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853
Code: ???????? ???????? ???????? ???????? (????????)
---[ end trace 0000000000000000 ]---
---
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Hello.
Notice this bug haven’t reproduce, I try my efforts reproduce this
with repro.c and repro.txt and I confirmed it crashed in the lastest
net tree.
kernel commit: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=e307b5a845c5951dabafc48d00b6424ee64716c4
kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=f8715b6ede5c4b90
However, this repro.c executed in the lastest net tree crashed titled
KASAN: slab-use-after-free Write in sco_sock_timeout
https://syzkaller.appspot.com/bug?extid=4c0d0c4cde787116d465
However, I submit 3 repro.c maybe related to this bug:
https://lore.kernel.org/all/CABOYnLwbz-Es5A+aa28yv-ApQ-X8Dr0E8FzCpLWm-4Vt4DKS1Q@mail.gmail.com/T/
This repro.c seems different from the above three and so I feel it is
necessary to inform.
I don’t analysis deeply and I also don’t know if these two bugs are
the same or related or not.
Hope it helps.
=* repro.c =*
#define _GNU_SOURCE
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/capability.h>
#include <linux/futex.h>
#include <linux/rfkill.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#ifndef __NR_finit_module
#define __NR_finit_module 313
#endif
#ifndef __NR_landlock_create_ruleset
#define __NR_landlock_create_ruleset 444
#endif
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 void thread_start(void* (*fn)(void*), void* arg) {
pthread_t th;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, 128 << 10);
int i = 0;
for (; i < 100; i++) {
if (pthread_create(&th, &attr, fn, arg) == 0) {
pthread_attr_destroy(&attr);
return;
}
if (errno == EAGAIN) {
usleep(50);
continue;
}
break;
}
exit(1);
}
typedef struct {
int state;
} event_t;
static void event_init(event_t* ev) { ev->state = 0; }
static void event_reset(event_t* ev) { ev->state = 0; }
static void event_set(event_t* ev) {
if (ev->state) exit(1);
__atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}
static void event_wait(event_t* ev) {
while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}
static int event_isset(event_t* ev) {
return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}
static int event_timedwait(event_t* ev, uint64_t timeout) {
uint64_t start = current_time_ms();
uint64_t now = start;
for (;;) {
uint64_t remain = timeout - (now - start);
struct timespec ts;
ts.tv_sec = remain / 1000;
ts.tv_nsec = (remain % 1000) * 1000 * 1000;
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1;
now = current_time_ms();
if (now - start > timeout) return 0;
}
}
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;
}
const int kInitNetNsFd = 201;
#define MAX_FDS 30
static long syz_init_net_socket(volatile long domain, volatile long type,
volatile long proto) {
int netns = open("/proc/self/ns/net", O_RDONLY);
if (netns == -1) return netns;
if (setns(kInitNetNsFd, 0)) return -1;
int sock = syscall(__NR_socket, domain, type, proto);
int err = errno;
if (setns(netns, 0)) exit(1);
close(netns);
errno = err;
return sock;
}
#define BTPROTO_HCI 1
#define ACL_LINK 1
#define SCAN_PAGE 2
typedef struct {
uint8_t b[6];
} __attribute__((packed)) bdaddr_t;
#define HCI_COMMAND_PKT 1
#define HCI_EVENT_PKT 4
#define HCI_VENDOR_PKT 0xff
struct hci_command_hdr {
uint16_t opcode;
uint8_t plen;
} __attribute__((packed));
struct hci_event_hdr {
uint8_t evt;
uint8_t plen;
} __attribute__((packed));
#define HCI_EV_CONN_COMPLETE 0x03
struct hci_ev_conn_complete {
uint8_t status;
uint16_t handle;
bdaddr_t bdaddr;
uint8_t link_type;
uint8_t encr_mode;
} __attribute__((packed));
#define HCI_EV_CONN_REQUEST 0x04
struct hci_ev_conn_request {
bdaddr_t bdaddr;
uint8_t dev_class[3];
uint8_t link_type;
} __attribute__((packed));
#define HCI_EV_REMOTE_FEATURES 0x0b
struct hci_ev_remote_features {
uint8_t status;
uint16_t handle;
uint8_t features[8];
} __attribute__((packed));
#define HCI_EV_CMD_COMPLETE 0x0e
struct hci_ev_cmd_complete {
uint8_t ncmd;
uint16_t opcode;
} __attribute__((packed));
#define HCI_OP_WRITE_SCAN_ENABLE 0x0c1a
#define HCI_OP_READ_BUFFER_SIZE 0x1005
struct hci_rp_read_buffer_size {
uint8_t status;
uint16_t acl_mtu;
uint8_t sco_mtu;
uint16_t acl_max_pkt;
uint16_t sco_max_pkt;
} __attribute__((packed));
#define HCI_OP_READ_BD_ADDR 0x1009
struct hci_rp_read_bd_addr {
uint8_t status;
bdaddr_t bdaddr;
} __attribute__((packed));
#define HCI_EV_LE_META 0x3e
struct hci_ev_le_meta {
uint8_t subevent;
} __attribute__((packed));
#define HCI_EV_LE_CONN_COMPLETE 0x01
struct hci_ev_le_conn_complete {
uint8_t status;
uint16_t handle;
uint8_t role;
uint8_t bdaddr_type;
bdaddr_t bdaddr;
uint16_t interval;
uint16_t latency;
uint16_t supervision_timeout;
uint8_t clk_accurancy;
} __attribute__((packed));
struct hci_dev_req {
uint16_t dev_id;
uint32_t dev_opt;
};
struct vhci_vendor_pkt_request {
uint8_t type;
uint8_t opcode;
} __attribute__((packed));
struct vhci_pkt {
uint8_t type;
union {
struct {
uint8_t opcode;
uint16_t id;
} __attribute__((packed)) vendor_pkt;
struct hci_command_hdr command_hdr;
};
} __attribute__((packed));
#define HCIDEVUP _IOW('H', 201, int)
#define HCISETSCAN _IOW('H', 221, int)
static int vhci_fd = -1;
static void rfkill_unblock_all() {
int fd = open("/dev/rfkill", O_WRONLY);
if (fd < 0) exit(1);
struct rfkill_event event = {0};
event.idx = 0;
event.type = RFKILL_TYPE_ALL;
event.op = RFKILL_OP_CHANGE_ALL;
event.soft = 0;
event.hard = 0;
if (write(fd, &event, sizeof(event)) < 0) exit(1);
close(fd);
}
static void hci_send_event_packet(int fd, uint8_t evt, void* data,
size_t data_len) {
struct iovec iv[3];
struct hci_event_hdr hdr;
hdr.evt = evt;
hdr.plen = data_len;
uint8_t type = HCI_EVENT_PKT;
iv[0].iov_base = &type;
iv[0].iov_len = sizeof(type);
iv[1].iov_base = &hdr;
iv[1].iov_len = sizeof(hdr);
iv[2].iov_base = data;
iv[2].iov_len = data_len;
if (writev(fd, iv, sizeof(iv) / sizeof(struct iovec)) < 0) exit(1);
}
static void hci_send_event_cmd_complete(int fd, uint16_t opcode, void* data,
size_t data_len) {
struct iovec iv[4];
struct hci_event_hdr hdr;
hdr.evt = HCI_EV_CMD_COMPLETE;
hdr.plen = sizeof(struct hci_ev_cmd_complete) + data_len;
struct hci_ev_cmd_complete evt_hdr;
evt_hdr.ncmd = 1;
evt_hdr.opcode = opcode;
uint8_t type = HCI_EVENT_PKT;
iv[0].iov_base = &type;
iv[0].iov_len = sizeof(type);
iv[1].iov_base = &hdr;
iv[1].iov_len = sizeof(hdr);
iv[2].iov_base = &evt_hdr;
iv[2].iov_len = sizeof(evt_hdr);
iv[3].iov_base = data;
iv[3].iov_len = data_len;
if (writev(fd, iv, sizeof(iv) / sizeof(struct iovec)) < 0) exit(1);
}
static bool process_command_pkt(int fd, char* buf, ssize_t buf_size) {
struct hci_command_hdr* hdr = (struct hci_command_hdr*)buf;
if (buf_size < (ssize_t)sizeof(struct hci_command_hdr) ||
hdr->plen != buf_size - sizeof(struct hci_command_hdr))
exit(1);
switch (hdr->opcode) {
case HCI_OP_WRITE_SCAN_ENABLE: {
uint8_t status = 0;
hci_send_event_cmd_complete(fd, hdr->opcode, &status, sizeof(status));
return true;
}
case HCI_OP_READ_BD_ADDR: {
struct hci_rp_read_bd_addr rp = {0};
rp.status = 0;
memset(&rp.bdaddr, 0xaa, 6);
hci_send_event_cmd_complete(fd, hdr->opcode, &rp, sizeof(rp));
return false;
}
case HCI_OP_READ_BUFFER_SIZE: {
struct hci_rp_read_buffer_size rp = {0};
rp.status = 0;
rp.acl_mtu = 1021;
rp.sco_mtu = 96;
rp.acl_max_pkt = 4;
rp.sco_max_pkt = 6;
hci_send_event_cmd_complete(fd, hdr->opcode, &rp, sizeof(rp));
return false;
}
}
char dummy[0xf9] = {0};
hci_send_event_cmd_complete(fd, hdr->opcode, dummy, sizeof(dummy));
return false;
}
static void* event_thread(void* arg) {
while (1) {
char buf[1024] = {0};
ssize_t buf_size = read(vhci_fd, buf, sizeof(buf));
if (buf_size < 0) exit(1);
if (buf_size > 0 && buf[0] == HCI_COMMAND_PKT) {
if (process_command_pkt(vhci_fd, buf + 1, buf_size - 1)) break;
}
}
return NULL;
}
#define HCI_HANDLE_1 200
#define HCI_HANDLE_2 201
#define HCI_PRIMARY 0
#define HCI_OP_RESET 0x0c03
static void initialize_vhci() {
int hci_sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
if (hci_sock < 0) exit(1);
vhci_fd = open("/dev/vhci", O_RDWR);
if (vhci_fd == -1) exit(1);
const int kVhciFd = 202;
if (dup2(vhci_fd, kVhciFd) < 0) exit(1);
close(vhci_fd);
vhci_fd = kVhciFd;
struct vhci_vendor_pkt_request vendor_pkt_req = {HCI_VENDOR_PKT, HCI_PRIMARY};
if (write(vhci_fd, &vendor_pkt_req, sizeof(vendor_pkt_req)) !=
sizeof(vendor_pkt_req))
exit(1);
struct vhci_pkt vhci_pkt;
if (read(vhci_fd, &vhci_pkt, sizeof(vhci_pkt)) != sizeof(vhci_pkt)) exit(1);
if (vhci_pkt.type == HCI_COMMAND_PKT &&
vhci_pkt.command_hdr.opcode == HCI_OP_RESET) {
char response[1] = {0};
hci_send_event_cmd_complete(vhci_fd, HCI_OP_RESET, response,
sizeof(response));
if (read(vhci_fd, &vhci_pkt, sizeof(vhci_pkt)) != sizeof(vhci_pkt)) exit(1);
}
if (vhci_pkt.type != HCI_VENDOR_PKT) exit(1);
int dev_id = vhci_pkt.vendor_pkt.id;
pthread_t th;
if (pthread_create(&th, NULL, event_thread, NULL)) exit(1);
int ret = ioctl(hci_sock, HCIDEVUP, dev_id);
if (ret) {
if (errno == ERFKILL) {
rfkill_unblock_all();
ret = ioctl(hci_sock, HCIDEVUP, dev_id);
}
if (ret && errno != EALREADY) exit(1);
}
struct hci_dev_req dr = {0};
dr.dev_id = dev_id;
dr.dev_opt = SCAN_PAGE;
if (ioctl(hci_sock, HCISETSCAN, &dr)) exit(1);
struct hci_ev_conn_request request;
memset(&request, 0, sizeof(request));
memset(&request.bdaddr, 0xaa, 6);
*(uint8_t*)&request.bdaddr.b[5] = 0x10;
request.link_type = ACL_LINK;
hci_send_event_packet(vhci_fd, HCI_EV_CONN_REQUEST, &request,
sizeof(request));
struct hci_ev_conn_complete complete;
memset(&complete, 0, sizeof(complete));
complete.status = 0;
complete.handle = HCI_HANDLE_1;
memset(&complete.bdaddr, 0xaa, 6);
*(uint8_t*)&complete.bdaddr.b[5] = 0x10;
complete.link_type = ACL_LINK;
complete.encr_mode = 0;
hci_send_event_packet(vhci_fd, HCI_EV_CONN_COMPLETE, &complete,
sizeof(complete));
struct hci_ev_remote_features features;
memset(&features, 0, sizeof(features));
features.status = 0;
features.handle = HCI_HANDLE_1;
hci_send_event_packet(vhci_fd, HCI_EV_REMOTE_FEATURES, &features,
sizeof(features));
struct {
struct hci_ev_le_meta le_meta;
struct hci_ev_le_conn_complete le_conn;
} le_conn;
memset(&le_conn, 0, sizeof(le_conn));
le_conn.le_meta.subevent = HCI_EV_LE_CONN_COMPLETE;
memset(&le_conn.le_conn.bdaddr, 0xaa, 6);
*(uint8_t*)&le_conn.le_conn.bdaddr.b[5] = 0x11;
le_conn.le_conn.role = 1;
le_conn.le_conn.handle = HCI_HANDLE_2;
hci_send_event_packet(vhci_fd, HCI_EV_LE_META, &le_conn, sizeof(le_conn));
pthread_join(th, NULL);
close(hci_sock);
}
static void setup_common() {
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);
setsid();
int netns = open("/proc/self/ns/net", O_RDONLY);
if (netns == -1) exit(1);
if (dup2(netns, kInitNetNsFd) < 0) exit(1);
close(netns);
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);
setup_common();
initialize_vhci();
sandbox_common();
drop_caps();
if (unshare(CLONE_NEWNET)) {
}
write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535");
setup_binderfs();
loop();
exit(1);
}
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 void close_fds() {
for (int fd = 3; fd < MAX_FDS; fd++) close(fd);
}
struct thread_t {
int created, call;
event_t ready, done;
};
static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static void* thr(void* arg) {
struct thread_t* th = (struct thread_t*)arg;
for (;;) {
event_wait(&th->ready);
event_reset(&th->ready);
execute_call(th->call);
__atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
event_set(&th->done);
}
return 0;
}
static void execute_one(void) {
int i, call, thread;
for (call = 0; call < 15; call++) {
for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
thread++) {
struct thread_t* th = &threads[thread];
if (!th->created) {
th->created = 1;
event_init(&th->ready);
event_init(&th->done);
event_set(&th->done);
thread_start(thr, th);
}
if (!event_isset(&th->done)) continue;
event_reset(&th->done);
th->call = call;
__atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
event_set(&th->ready);
if (call == 1 || call == 4 || call == 5) break;
event_timedwait(&th->done, 50);
break;
}
}
for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
sleep_ms(1);
close_fds();
}
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 (;;) {
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break;
sleep_ms(1);
if (current_time_ms() - start < 5000) continue;
kill_and_wait(pid, &status);
break;
}
}
}
uint64_t r[1] = {0xffffffffffffffff};
void execute_call(int call) {
intptr_t res = 0;
switch (call) {
case 0:
res = -1;
res = syz_init_net_socket(/*fam=*/0x1f, /*type=*/5, /*proto=*/2);
if (res != -1) r[0] = res;
break;
case 1:
*(uint16_t*)0x200002c0 = 0x1f;
memset((void*)0x200002c2, 0, 6);
syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200002c0ul,
/*addrlen=*/8ul);
break;
case 2:
*(uint16_t*)0x20000500 = 0x1f;
memset((void*)0x20000502, 170, 5);
*(uint8_t*)0x20000507 = 0x11;
syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x20000500ul,
/*addrlen=*/8ul);
break;
case 3:
syscall(__NR_shutdown, /*fd=*/-1, /*how=*/0ul);
break;
case 4:
syscall(__NR_open, /*file=*/0ul, /*flags=*/0x6143c2ul, /*mode=*/0x19ul);
break;
case 5:
syscall(__NR_mkdirat, /*fd=*/-1, /*path=*/0ul, /*mode=*/8ul);
{
int i;
for (i = 0; i < 32; i++) {
syscall(__NR_mkdirat, /*fd=*/-1, /*path=*/0ul, /*mode=*/8ul);
}
}
break;
case 6:
*(uint64_t*)0x20000400 = 0x2081;
*(uint64_t*)0x20000408 = 1;
syscall(__NR_landlock_create_ruleset, /*attr=*/0x20000400ul,
/*size=*/0x10ul, /*flags=*/0ul);
break;
case 7:
syscall(__NR_ioctl, /*fd=*/-1, /*cmd=*/0x708, /*arg=*/0ul);
break;
case 8:
syscall(__NR_getsockopt, /*fd=*/-1, /*level=*/1, /*optname=*/0x11,
/*optval=*/0ul, /*optlen=*/0ul);
break;
case 9:
syscall(__NR_getsockopt, /*fd=*/-1, /*level=*/0x10f, /*opt=*/0x84,
/*val=*/0ul, /*len=*/0ul);
break;
case 10:
syscall(__NR_accept, /*fd=*/-1, /*peer=*/0ul, /*peerlen=*/0ul);
break;
case 11:
syscall(__NR_write, /*fd=*/-1, /*buf=*/0x20000a00ul, /*count=*/0ul);
break;
case 12:
syscall(__NR_sendfile, /*fdout=*/-1, /*fdin=*/-1, /*off=*/0ul,
/*count=*/0xef82ul);
break;
case 13:
*(uint16_t*)0x20000080 = 0x1f;
memset((void*)0x20000082, 255, 6);
syscall(__NR_connect, /*fd=*/-1, /*addr=*/0x20000080ul, /*addrlen=*/8ul);
break;
case 14:
syscall(__NR_finit_module, /*fd=*/-1, /*args=*/0ul, /*flags=*/1ul);
break;
}
}
int main(void) {
syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
do_sandbox_none();
return 0;
}
=* repro.txt =*
r0 = syz_init_net_socket$bt_sco(0x1f, 0x5, 0x2)
connect$bt_sco(r0, &(0x7f00000002c0), 0x8) (async)
connect$bt_sco(r0, &(0x7f0000000500)={0x1f,
@fixed={'\xaa\xaa\xaa\xaa\xaa', 0x11}}, 0x8)
shutdown(0xffffffffffffffff, 0x0)
open(0x0, 0x6143c2, 0x19) (async)
mkdirat(0xffffffffffffffff, 0x0, 0x8) (async, rerun: 32)
landlock_create_ruleset(&(0x7f0000000400)={0x2081, 0x1}, 0x10, 0x0)
ioctl$I2C_RDWR(0xffffffffffffffff, 0x708, 0x0)
getsockopt$sock_cred(0xffffffffffffffff, 0x1, 0x11, 0x0, 0x0)
getsockopt$TIPC_SOCK_RECVQ_DEPTH(0xffffffffffffffff, 0x10f, 0x84, 0x0, 0x0)
accept$alg(0xffffffffffffffff, 0x0, 0x0)
write(0xffffffffffffffff, &(0x7f0000000a00), 0x0)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xef82)
connect$bt_sco(0xffffffffffffffff, &(0x7f0000000080)={0x1f, @none}, 0x8)
finit_module(0xffffffffffffffff, 0x0, 0x1)
and see also https://gist.github.com/xrivendell7/c42e214061ed917254f0725d5564cec6
Best regards
xingwei Lee