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Date: Tue, 9 Nov 2021 21:58:16 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: Kaustubh Pandey <kapandey@...eaurora.org>, netdev@...r.kernel.org,
edumazet@...gle.com, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
davem@...emloft.net
Cc: sharathv@...eaurora.org
Subject: Re: Kernel Panic observed in tcp_v4_early_demux
On 11/9/21 9:44 PM, Kaustubh Pandey wrote:
> Hi Everyone,
>
> I observed panic in tcp_v4_early_demux with below data:
>
> Testcase details:
> No concrete steps to reproduce this.
> Observed this with and without KASAN.
> Overall testcase involves data transfer and basic multimedia usecases.
>
> Kernel Version: v5.4
Please use recent kernel for KASAN games.
Thanks !
>
> Can you pls help on how this can be resolved?
>
> dmesg:
> [406822.185272] (5) ==================================================================
> [406822.185318] (5) BUG: KASAN: use-after-free in tcp_v4_early_demux+0x1b8/0x254
> [406822.185339] (5) Read of size 2 at addr ffffff801e66db3a by task rx_thr_0/23872
> [406822.185349] (5)
> [406822.185366] (5) CPU: 5 PID: 23872 Comm: rx_thr_0 Tainted: G S W O 5.4.86-qgki-g5eb04aadbc80 #1
> [406822.185383] (5) Call trace:
> [406822.185397] (5) dump_backtrace+0x0/0x1d0
> [406822.185406] (5) show_stack+0x18/0x24
> [406822.185419] (5) dump_stack+0xe0/0x150
> [406822.185434] (5) print_address_description+0x88/0x578
> [406822.185444] (5) __kasan_report+0x1c4/0x1e0
> [406822.185454] (5) kasan_report+0x14/0x20
> [406822.185463] (5) __asan_load2+0x94/0x98
> [406822.185473] (5) tcp_v4_early_demux+0x1b8/0x254
> [406822.185484] (5) ip_rcv_finish_core+0x490/0x594
> [406822.185492] (5) ip_rcv+0x10c/0x17c
> [406822.185506] (5) __netif_receive_skb_core+0xd4c/0x1270
> [406822.185516] (5) __netif_receive_skb_list_core+0x13c/0x400
> [406822.185525] (5) __netif_receive_skb_list+0x1b8/0x220
> [406822.185535] (5) netif_receive_skb_list_internal+0x1e0/0x314
> [406822.185545] (5) netif_receive_skb_list+0x170/0x290
> [406822.188506] (5)
> [406822.188524] (5) Allocated by task 23872:
> [406822.188541] (5) __kasan_kmalloc+0x100/0x1c0
> [406822.188550] (5) kasan_slab_alloc+0x18/0x24
> [406822.188559] (5) kmem_cache_alloc+0x2c4/0x344
> [406822.188569] (5) dst_alloc+0xa8/0x100
> [406822.188580] (5) ip_route_input_rcu+0xa14/0xda4
> [406822.188590] (5) ip_route_input_noref+0x70/0xb0
> [406822.188599] (5) ip_rcv_finish_core+0xfc/0x594
> [406822.188607] (5) ip_rcv+0x10c/0x17c
> [406822.188618] (5) __netif_receive_skb_core+0xd4c/0x1270
> [406822.188627] (5) __netif_receive_skb_list_core+0x13c/0x400
> [406822.188637] (5) __netif_receive_skb_list+0x1b8/0x220
> [406822.188646] (5) netif_receive_skb_list_internal+0x1e0/0x314
> [406822.188655] (5) netif_receive_skb_list+0x170/0x290
> [406822.191579] (5)
> [406822.191592] (5) Freed by task 23:
> [406822.191606] (5) __kasan_slab_free+0x164/0x234
> [406822.191616] (5) kasan_slab_free+0x14/0x24
> [406822.191625] (5) slab_free_freelist_hook+0xe0/0x164
> [406822.191633] (5) kmem_cache_free+0xfc/0x354
> [406822.191643] (5) dst_destroy+0x170/0x1cc
> [406822.191652] (5) dst_destroy_rcu+0x14/0x20
> [406822.191663] (5) rcu_do_batch+0x29c/0x518
> [406822.191672] (5) nocb_cb_wait+0xfc/0x854
> [406822.191682] (5) rcu_nocb_cb_kthread+0x24/0x48
> [406822.191691] (5) kthread+0x228/0x240
> [406822.191700] (5) ret_from_fork+0x10/0x18
> [406822.191707] (5)
> [406822.191720] (5) The buggy address belongs to the object at ffffff801e66db00
> [406822.191720] which belongs to the cache ip_dst_cache of size 176
> [406822.191733] (5) The buggy address is located 58 bytes inside of
> [406822.191733] 176-byte region [ffffff801e66db00, ffffff801e66dbb0)
> [406822.191744] (5) The buggy address belongs to the page:
> [406822.191759] (5) page:ffffffff00599b00 refcount:1 mapcount:0 mapping:ffffff806c567480 index:0xffffff801e66cd00 compound_mapcount: 0
> [406822.191769] (5) flags: 0x10200(slab|head)
> [406822.191783] (5) raw: 0000000000010200 ffffffff06b16c00 0000000400000004 ffffff806c567480
> [406822.191794] (5) raw: ffffff801e66cd00 0000000080200008 00000001ffffffff 0000000000000000
> [406822.191801] (5) page dumped because: kasan: bad access detected
> [406822.191808] (5)
> [406822.191817] (5) Memory state around the buggy address:
> [406822.191829] (5) ffffff801e66da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [406822.191841] (5) ffffff801e66da80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
> [406822.191852] (5) >ffffff801e66db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [406822.191861] (5) ^
> [406822.191872] (5) ffffff801e66db80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
> [406822.191882] (5) ffffff801e66dc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [406822.191892] (5)
> ==================================================================
> [406822.191902] (5) Disabling lock debugging due to kernel taint
> [406822.192721] (5) Kernel panic - not syncing: panic_on_warn set ...
> [406822.192788] (5) CPU: 5 PID: 23872 Comm: rx_thr_0 Tainted: G S B W O 5.4.86-qgki-g5eb04aadbc80 #1
> [406822.192808] (5) Call trace:
> [406822.192820] (5) dump_backtrace+0x0/0x1d0
> [406822.192831] (5) show_stack+0x18/0x24
> [406822.192844] (5) dump_stack+0xe0/0x150
> [406822.192855] (5) panic+0x210/0x410
> [406822.192867] (5) __kasan_report+0x0/0x1e0
> [406822.192878] (5) tokenize_frame_descr+0x0/0x124
> [406822.192889] (5) kasan_report+0x14/0x20
> [406822.192900] (5) __asan_load2+0x94/0x98
> [406822.192912] (5) tcp_v4_early_demux+0x1b8/0x254
> [406822.192924] (5) ip_rcv_finish_core+0x490/0x594
> [406822.192934] (5) ip_rcv+0x10c/0x17c
> [406822.192946] (5) __netif_receive_skb_core+0xd4c/0x1270
> [406822.192958] (5) __netif_receive_skb_list_core+0x13c/0x400
> [406822.192969] (5) __netif_receive_skb_list+0x1b8/0x220
> [406822.192981] (5) netif_receive_skb_list_internal+0x1e0/0x314
> [406822.192991] (5) netif_receive_skb_list+0x170/0x290
>
> Thanks,
> Kaustubh
>
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