KASAN: slab-out-of-bounds in ipvlan_queue_xmit

[Jiacheng Xu]

Hello,

When using modified Syzkaller to fuzz the latest Linux kernel, the
following crash was triggered.

HEAD commit: 3d7cb6b04c3f Linux-5.19
git tree: upstream

kernel config: https://drive.google.com/file/d/1wgIUDwP5ho29AM-K7HhysSTfWFpfXYkG/view?usp=sharing
syz repro: https://drive.google.com/file/d/1GcF5GvQ2LkFCm_ij_gCwb2qOUSAbdzRT/view?usp=sharing
C reproducer: https://drive.google.com/file/d/1XcEYzdr7cGzdjP8epEUe2HMJ0DgbZRWl/view?usp=sharing

Environment:
Ubuntu 20.04 on Linux 5.4.0
QEMU 4.2.1:
qemu-system-x86_64 \
  -m 2G \
  -smp 2 \
  -kernel /home/workdir/bzImage \
  -append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
  -drive file=/home/workdir/stretch.img,format=raw \
  -net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \
  -net nic,model=e1000 \
  -enable-kvm \
  -nographic \
  -pidfile vm.pid \
  2>&1 | tee vm.log

If you fix this issue, please add the following tag to the commit:
Credits to Jiacheng Xu<stitch@xxxxxxxxxx>

==================================================================
BUG: KASAN: slab-out-of-bounds in ipvlan_queue_xmit+0x16c0/0x1950
Read of size 4 at addr ffff888042046fff by task repro/6447

CPU: 1 PID: 6447 Comm: repro Not tainted 5.19.0 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 4
Call Trace:
<TASK>
dump_stack_lvl+0xcd/0x134
print_report.cold+0xe5/0x659
? ipvlan_queue_xmit+0x16c0/0x1950
kasan_report+0x8a/0x1b0
? audit_kill_trees+0x2f0/0x300
? ipvlan_queue_xmit+0x16c0/0x1950
ipvlan_queue_xmit+0x16c0/0x1950
? ipvlan_handle_mode_l3+0x120/0x120
? skb_csum_hwoffload_help+0x1a0/0x1a0
? __sanitizer_cov_trace_pc+0x1a/0x40
? validate_xmit_xfrm+0x49d/0x10a0
? __sanitizer_cov_trace_pc+0x1a/0x40
? netif_skb_features+0x45b/0xbb0
? __sanitizer_cov_trace_pc+0x1a/0x40
? validate_xmit_skb+0x878/0xec0
? __sanitizer_cov_trace_pc+0x1a/0x40
ipvlan_start_xmit+0x45/0x190
__dev_direct_xmit+0x42d/0x630
? validate_xmit_skb_list+0x140/0x140
? packet_poll+0x4d0/0x4d0
? __sanitizer_cov_trace_pc+0x1a/0x40
? netdev_pick_tx+0x14f/0xbe0
packet_direct_xmit+0x1b8/0x2b0
packet_sendmsg+0x223e/0x4d50
? __sanitizer_cov_trace_pc+0x1a/0x40
? aa_label_sk_perm+0x89/0xe0
? __sanitizer_cov_trace_pc+0x1a/0x40
? aa_sk_perm+0x30f/0xa90
? tpacket_rcv+0x32c0/0x32c0
? aa_af_perm+0x230/0x230
? __sanitizer_cov_trace_pc+0x1a/0x40
? __sanitizer_cov_trace_pc+0x1a/0x40
? tpacket_rcv+0x32c0/0x32c0
sock_sendmsg+0xc3/0x120
__sys_sendto+0x21a/0x330
? __ia32_sys_getpeername+0xb0/0xb0
? x86_pmu_start+0x30/0x270
? syscall_enter_from_user_mode+0x1c/0x70
? rcu_read_lock_sched_held+0x9c/0xd0
? rcu_read_lock_bh_held+0xb0/0xb0
__x64_sys_sendto+0xdd/0x1b0
? lockdep_hardirqs_on+0x79/0x100
? syscall_enter_from_user_mode+0x21/0x70
do_syscall_64+0x35/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2dc0ae4469
Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 8
RSP: 002b:00007fff157b1d38 EFLAGS: 00000216 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2dc0ae4469
RDX: 000000000000000e RSI: 0000000020000100 RDI: 0000000000000005
RBP: 00007fff157b1d60 R08: 0000000020000140 R09: 0000000000000014
R10: 0000000000000000 R11: 0000000000000216 R12: 000055dc98e00f10
R13: 00007fff157b1e70 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Allocated by task 0:
(stack is not available)
The buggy address belongs to the object at ffff888042046000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 2047 bytes to the right of
2048-byte region [ffff888042046000, ffff888042046800)

The buggy address belongs to the physical page:
page:ffffea0001081000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x00
head:ffffea0001081000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000010200 0000000000000000 dead000000000122 ffff888011842000
raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_A4
prep_new_page+0x297/0x330
get_page_from_freelist+0x215f/0x3c50
__alloc_pages+0x321/0x710
alloc_pages+0x119/0x250
new_slab+0x2a9/0x3f0
___slab_alloc+0xd5a/0x1140
__slab_alloc.isra.0+0x4d/0xa0
__kmalloc_node_track_caller+0x321/0x440
kmalloc_reserve+0x32/0xd0
pskb_expand_head+0x148/0x1060
netlink_trim+0x1ea/0x240
netlink_broadcast+0x5b/0xd00
nlmsg_notify+0x8f/0x280
rtmsg_ifinfo_event.part.0+0xb6/0xe0
rtmsg_ifinfo+0x7f/0xa0
__dev_notify_flags+0x235/0x2c0
page last free stack trace:
free_pcp_prepare+0x51f/0xd00
free_unref_page+0x19/0x5b0
__unfreeze_partials+0x3d2/0x3f0
___cache_free+0x12c/0x140
qlist_free_all+0x6a/0x170
kasan_quarantine_reduce+0x13d/0x180
__kasan_slab_alloc+0xa2/0xc0
slab_post_alloc_hook+0x4d/0x4f0
kmem_cache_alloc+0x1be/0x460
getname_flags+0xd2/0x5b0
vfs_fstatat+0x73/0xb0
__do_sys_newlstat+0x8b/0x110
do_syscall_64+0x35/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
ffff888042046e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888042046f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888042046f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
ffff888042047000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888042047080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6447 Comm: repro Not tainted 5.19.0 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 4
Call Trace:
<TASK>
dump_stack_lvl+0xcd/0x134
panic+0x2d7/0x636
? panic_print_sys_info.part.0+0x10b/0x10b
? asm_sysvec_apic_timer_interrupt+0x16/0x20
? ipvlan_queue_xmit+0x16c0/0x1950
end_report.part.0+0x3f/0x7c
kasan_report.cold+0x8/0x12
? audit_kill_trees+0x2f0/0x300
? ipvlan_queue_xmit+0x16c0/0x1950
ipvlan_queue_xmit+0x16c0/0x1950
? ipvlan_handle_mode_l3+0x120/0x120
? skb_csum_hwoffload_help+0x1a0/0x1a0
? __sanitizer_cov_trace_pc+0x1a/0x40
? validate_xmit_xfrm+0x49d/0x10a0
? __sanitizer_cov_trace_pc+0x1a/0x40
? netif_skb_features+0x45b/0xbb0
? __sanitizer_cov_trace_pc+0x1a/0x40
? validate_xmit_skb+0x878/0xec0
? __sanitizer_cov_trace_pc+0x1a/0x40
ipvlan_start_xmit+0x45/0x190
__dev_direct_xmit+0x42d/0x630
? validate_xmit_skb_list+0x140/0x140
? packet_poll+0x4d0/0x4d0
? __sanitizer_cov_trace_pc+0x1a/0x40
? netdev_pick_tx+0x14f/0xbe0
packet_direct_xmit+0x1b8/0x2b0
packet_sendmsg+0x223e/0x4d50
? __sanitizer_cov_trace_pc+0x1a/0x40
? aa_label_sk_perm+0x89/0xe0
? __sanitizer_cov_trace_pc+0x1a/0x40
? aa_sk_perm+0x30f/0xa90
? tpacket_rcv+0x32c0/0x32c0
? aa_af_perm+0x230/0x230
? __sanitizer_cov_trace_pc+0x1a/0x40
? __sanitizer_cov_trace_pc+0x1a/0x40
? tpacket_rcv+0x32c0/0x32c0
sock_sendmsg+0xc3/0x120
__sys_sendto+0x21a/0x330
? __ia32_sys_getpeername+0xb0/0xb0
? x86_pmu_start+0x30/0x270
? syscall_enter_from_user_mode+0x1c/0x70
? rcu_read_lock_sched_held+0x9c/0xd0
? rcu_read_lock_bh_held+0xb0/0xb0
__x64_sys_sendto+0xdd/0x1b0
? lockdep_hardirqs_on+0x79/0x100
? syscall_enter_from_user_mode+0x21/0x70
do_syscall_64+0x35/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2dc0ae4469
Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 8
RSP: 002b:00007fff157b1d38 EFLAGS: 00000216 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2dc0ae4469
RDX: 000000000000000e RSI: 0000000020000100 RDI: 0000000000000005
RBP: 00007fff157b1d60 R08: 0000000020000140 R09: 0000000000000014
R10: 0000000000000000 R11: 0000000000000216 R12: 000055dc98e00f10
R13: 00007fff157b1e70 R14: 0000000000000000 R15: 0000000000000000
</TASK>

Best Regards,
Jiacheng