CVE-2023-52637

In the Linux kernel, the following vulnerability has been resolved:

can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)

Lock jsk->sk to prevent UAF when setsockopt(..., SO_J1939_FILTER, ...)

modifies jsk->filters while receiving packets.

Following trace was seen on affected system:

==================================================================

BUG: KASAN: slab-use-after-free in j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

Read of size 4 at addr ffff888012144014 by task j1939/350

CPU: 0 PID: 350 Comm: j1939 Tainted: G W OE 6.5.0-rc5 #1

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014

Call Trace:

print_report+0xd3/0x620

? kasan_complete_mode_report_info+0x7d/0x200

? j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

kasan_report+0xc2/0x100

? j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

__asan_load4+0x84/0xb0

j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

j1939_sk_recv+0x20b/0x320 [can_j1939]

? __kasan_check_write+0x18/0x20

? __pfx_j1939_sk_recv+0x10/0x10 [can_j1939]

? j1939_simple_recv+0x69/0x280 [can_j1939]

? j1939_ac_recv+0x5e/0x310 [can_j1939]

j1939_can_recv+0x43f/0x580 [can_j1939]

? __pfx_j1939_can_recv+0x10/0x10 [can_j1939]

? raw_rcv+0x42/0x3c0 [can_raw]

? __pfx_j1939_can_recv+0x10/0x10 [can_j1939]

can_rcv_filter+0x11f/0x350 [can]

can_receive+0x12f/0x190 [can]

? __pfx_can_rcv+0x10/0x10 [can]

can_rcv+0xdd/0x130 [can]

? __pfx_can_rcv+0x10/0x10 [can]

__netif_receive_skb_one_core+0x13d/0x150

? __pfx___netif_receive_skb_one_core+0x10/0x10

? __kasan_check_write+0x18/0x20

? _raw_spin_lock_irq+0x8c/0xe0

__netif_receive_skb+0x23/0xb0

process_backlog+0x107/0x260

__napi_poll+0x69/0x310

net_rx_action+0x2a1/0x580

? __pfx_net_rx_action+0x10/0x10

? __pfx__raw_spin_lock+0x10/0x10

? handle_irq_event+0x7d/0xa0

__do_softirq+0xf3/0x3f8

do_softirq+0x53/0x80

</IRQ>

<TASK>

__local_bh_enable_ip+0x6e/0x70

netif_rx+0x16b/0x180

can_send+0x32b/0x520 [can]

? __pfx_can_send+0x10/0x10 [can]

? __check_object_size+0x299/0x410

raw_sendmsg+0x572/0x6d0 [can_raw]

? __pfx_raw_sendmsg+0x10/0x10 [can_raw]

? apparmor_socket_sendmsg+0x2f/0x40

? __pfx_raw_sendmsg+0x10/0x10 [can_raw]

sock_sendmsg+0xef/0x100

sock_write_iter+0x162/0x220

? __pfx_sock_write_iter+0x10/0x10

? __rtnl_unlock+0x47/0x80

? security_file_permission+0x54/0x320

vfs_write+0x6ba/0x750

? __pfx_vfs_write+0x10/0x10

? __fget_light+0x1ca/0x1f0

? __rcu_read_unlock+0x5b/0x280

ksys_write+0x143/0x170

? __pfx_ksys_write+0x10/0x10

? __kasan_check_read+0x15/0x20

? fpregs_assert_state_consistent+0x62/0x70

__x64_sys_write+0x47/0x60

do_syscall_64+0x60/0x90

? do_syscall_64+0x6d/0x90

? irqentry_exit+0x3f/0x50

? exc_page_fault+0x79/0xf0

entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Allocated by task 348:

kasan_save_stack+0x2a/0x50

kasan_set_track+0x29/0x40

kasan_save_alloc_info+0x1f/0x30

__kasan_kmalloc+0xb5/0xc0

__kmalloc_node_track_caller+0x67/0x160

j1939_sk_setsockopt+0x284/0x450 [can_j1939]

__sys_setsockopt+0x15c/0x2f0

__x64_sys_setsockopt+0x6b/0x80

do_syscall_64+0x60/0x90

entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Freed by task 349:

kasan_save_stack+0x2a/0x50

kasan_set_track+0x29/0x40

kasan_save_free_info+0x2f/0x50

__kasan_slab_free+0x12e/0x1c0

__kmem_cache_free+0x1b9/0x380

kfree+0x7a/0x120

j1939_sk_setsockopt+0x3b2/0x450 [can_j1939]

__sys_setsockopt+0x15c/0x2f0

__x64_sys_setsockopt+0x6b/0x80

do_syscall_64+0x60/0x90

entry_SYSCALL_64_after_hwframe+0x6e/0xd8