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Date: Tue, 10 Jan 2023 15:07:44 -0700
From: Kyle Zeng <zengyhkyle@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Type Confusion in Linux Kernel
Hi John,
A crash report is attached to this email. I hope this helps evaluate
the security implication of the bug.
Best,
Kyle Zeng
==================================================================
BUG: KASAN: slab-out-of-bounds in cbq_enqueue+0x9d8/0x1fc0
Read of size 1 at addr ffff88806bfd40aa by task sd-resolve/250
CPU: 2 PID: 250 Comm: sd-resolve Not tainted 5.4.188 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
dump_stack+0x19d/0x1e7
print_address_description+0xd7/0xca0
__kasan_report+0x1e0/0x270
kasan_report+0x30/0x60
cbq_enqueue+0x9d8/0x1fc0
__dev_queue_xmit+0x2238/0x49f0
ip_finish_output2+0x1529/0x2430
ip_output+0x358/0x3f0
ip_send_skb+0xec/0x220
udp_send_skb+0xd4f/0x1710
udp_sendmsg+0x3889/0x4ee0
____sys_sendmsg+0x1083/0x1240
__sys_sendmmsg+0x88d/0xe90
__x64_sys_sendmmsg+0xa1/0xb0
do_syscall_64+0x32f/0x3e0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f188612135f
Code: 89 f5 55 53 89 cd 41 89 d4 89 fb 48 83 ec 18 e8 b7 b1 00 00 44
89 e2 41 89 c0 48 63 fb 4c 63 d5 4c 89 ee b8 33 01 00 00 0f 05 <48> 3d
00 f0 ff ff 77 1b 44 89 c7 89 44 24 0c e8 ed b1 00 00 8b 44
RSP: 002b:00007f1883b5fc10 EFLAGS: 00000293 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007f188612135f
RDX: 0000000000000002 RSI: 00007f1883b5fdb0 RDI: 000000000000000d
RBP: 0000000000004000 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000004000 R11: 0000000000000293 R12: 0000000000000002
R13: 00007f1883b5fdb0 R14: 0000000008ce68e8 R15: 00007f1883b67db8
Allocated by task 1285:
__kasan_kmalloc+0x1d9/0xdf0
tc_new_tfilter+0x1f2e/0x41f0
rtnetlink_rcv_msg+0x777/0x12d0
netlink_rcv_skb+0x39b/0x870
netlink_unicast+0xb45/0xf90
netlink_sendmsg+0x1477/0x1830
____sys_sendmsg+0x1206/0x1240
__sys_sendmsg+0x48d/0x570
do_syscall_64+0x32f/0x3e0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 106:
__kasan_slab_free+0x293/0xe30
kfree+0x33e/0x1010
process_one_work+0xea3/0x17b0
worker_thread+0xecc/0x1a00
kthread+0x33b/0x3a0
ret_from_fork+0x35/0x40
The buggy address belongs to the object at ffff88806bfd4000
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 42 bytes to the right of
128-byte region [ffff88806bfd4000, ffff88806bfd4080)
The buggy address belongs to the page:
page:ffffea0001aff500 refcount:1 mapcount:0 mapping:ffff88806bc03200 index:0x0
flags: 0x100000000000200(slab)
raw: 0100000000000200 ffffea0001a50b40 0000000400000004 ffff88806bc03200
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88806bfd3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88806bfd4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
>ffff88806bfd4080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88806bfd4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806bfd4180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
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