net: can: j1939: Initialize unused data in j1939_send_one()

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

net: can: j1939: Initialize unused data in j1939_send_one()

syzbot reported kernel-infoleak in raw_recvmsg() [1]. j1939_send_one()

creates full frame including unused data, but it doesn't initialize

it. This causes the kernel-infoleak issue. Fix this by initializing

unused data.

[1]

BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]

BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline]

BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:29 [inline]

BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:245 [inline]

BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:271 [inline]

BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x366/0x2520 lib/iov_iter.c:185

instrument_copy_to_user include/linux/instrumented.h:114 [inline]

copy_to_user_iter lib/iov_iter.c:24 [inline]

iterate_ubuf include/linux/iov_iter.h:29 [inline]

iterate_and_advance2 include/linux/iov_iter.h:245 [inline]

iterate_and_advance include/linux/iov_iter.h:271 [inline]

_copy_to_iter+0x366/0x2520 lib/iov_iter.c:185

copy_to_iter include/linux/uio.h:196 [inline]

memcpy_to_msg include/linux/skbuff.h:4113 [inline]

raw_recvmsg+0x2b8/0x9e0 net/can/raw.c:1008

sock_recvmsg_nosec net/socket.c:1046 [inline]

sock_recvmsg+0x2c4/0x340 net/socket.c:1068

____sys_recvmsg+0x18a/0x620 net/socket.c:2803

___sys_recvmsg+0x223/0x840 net/socket.c:2845

do_recvmmsg+0x4fc/0xfd0 net/socket.c:2939

__sys_recvmmsg net/socket.c:3018 [inline]

__do_sys_recvmmsg net/socket.c:3041 [inline]

__se_sys_recvmmsg net/socket.c:3034 [inline]

__x64_sys_recvmmsg+0x397/0x490 net/socket.c:3034

x64_sys_call+0xf6c/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:300

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:

slab_post_alloc_hook mm/slub.c:3804 [inline]

slab_alloc_node mm/slub.c:3845 [inline]

kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888

kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577

__alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668

alloc_skb include/linux/skbuff.h:1313 [inline]

alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504

sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795

sock_alloc_send_skb include/net/sock.h:1842 [inline]

j1939_sk_alloc_skb net/can/j1939/socket.c:878 [inline]

j1939_sk_send_loop net/can/j1939/socket.c:1142 [inline]

j1939_sk_sendmsg+0xc0a/0x2730 net/can/j1939/socket.c:1277

sock_sendmsg_nosec net/socket.c:730 [inline]

__sock_sendmsg+0x30f/0x380 net/socket.c:745

____sys_sendmsg+0x877/0xb60 net/socket.c:2584

___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638

__sys_sendmsg net/socket.c:2667 [inline]

__do_sys_sendmsg net/socket.c:2676 [inline]

__se_sys_sendmsg net/socket.c:2674 [inline]

__x64_sys_sendmsg+0x307/0x4a0 net/socket.c:2674

x64_sys_call+0xc4b/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:47

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x77/0x7f

Bytes 12-15 of 16 are uninitialized

Memory access of size 16 starts at ffff888120969690

Data copied to user address 00000000200017c0

CPU: 1 PID: 5050 Comm: syz-executor198 Not tainted 6.9.0-rc5-syzkaller-00031-g71b1543c83d6 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024