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KASAN: slab-out-of-bounds Read in ipvlan_queue_xmit

Status: upstream: reported C repro on 2020/11/30 08:36
Reported-by: syzbot+3aad963f7947d9c5911f@syzkaller.appspotmail.com
First crash: 1026d, last: 226d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 KASAN: slab-out-of-bounds Read in ipvlan_queue_xmit C error 1 388d 388d 0/1 upstream: reported C repro on 2022/08/30 13:48
upstream KASAN: slab-out-of-bounds Read in ipvlan_queue_xmit net C error error 8 573d 1050d 24/25 fixed on 2023/02/24 13:50
upstream KMSAN: uninit-value in ipvlan_queue_xmit net C 2 388d 971d 24/25 fixed on 2023/02/24 13:50
linux-4.19 KASAN: use-after-free Read in ipvlan_queue_xmit (2) C error 2 388d 857d 0/1 upstream: reported C repro on 2021/05/18 15:37
upstream KASAN: use-after-free Read in ipvlan_queue_xmit (3) net C error error 8 414d 1011d 24/25 fixed on 2023/02/24 13:51
▶ ▼ Fix bisection attempts (12)
Created Duration User Patch Repo Result
2021/11/07 19:49 12m bisect fix linux-4.19.y error job log (0)
2021/10/08 19:20 28m bisect fix linux-4.19.y job log (0) log
2021/09/08 18:04 27m bisect fix linux-4.19.y job log (0) log
2021/07/23 01:42 25m bisect fix linux-4.19.y job log (0) log
2021/06/22 18:37 23m bisect fix linux-4.19.y job log (0) log
2021/05/23 12:03 28m bisect fix linux-4.19.y job log (0) log
2021/04/23 10:17 22m bisect fix linux-4.19.y job log (0) log
2021/03/24 09:55 22m bisect fix linux-4.19.y job log (0) log
2021/02/22 05:58 23m bisect fix linux-4.19.y job log (0) log
2021/02/18 15:23 19m bisect fix linux-4.19.y error job log (0)
2021/02/12 04:56 0m bisect fix linux-4.19.y error job log (0)
2021/01/13 04:33 22m bisect fix linux-4.19.y job log (0) log

Sample crash report:
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
==================================================================
BUG: KASAN: slab-out-of-bounds in ether_addr_equal include/linux/etherdevice.h:321 [inline]
BUG: KASAN: slab-out-of-bounds in ipvlan_xmit_mode_l2 drivers/net/ipvlan/ipvlan_core.c:605 [inline]
BUG: KASAN: slab-out-of-bounds in ipvlan_queue_xmit+0x9d2/0x18e0 drivers/net/ipvlan/ipvlan_core.c:651
Read of size 4 at addr ffff8880aaf6d4ff by task syz-executor370/8107

CPU: 1 PID: 8107 Comm: syz-executor370 Not tainted 4.19.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load4_noabort+0x88/0x90 mm/kasan/report.c:432
 ether_addr_equal include/linux/etherdevice.h:321 [inline]
 ipvlan_xmit_mode_l2 drivers/net/ipvlan/ipvlan_core.c:605 [inline]
 ipvlan_queue_xmit+0x9d2/0x18e0 drivers/net/ipvlan/ipvlan_core.c:651
 ipvlan_start_xmit+0x4f/0x190 drivers/net/ipvlan/ipvlan_main.c:290
 __netdev_start_xmit include/linux/netdevice.h:4333 [inline]
 netdev_start_xmit include/linux/netdevice.h:4347 [inline]
 dev_direct_xmit+0x3f9/0x6d0 net/core/dev.c:3905
 packet_snd net/packet/af_packet.c:2988 [inline]
 packet_sendmsg+0x2474/0x6aff net/packet/af_packet.c:3013
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:632
 sock_write_iter+0x287/0x3c0 net/socket.c:901
 call_write_iter include/linux/fs.h:1821 [inline]
 aio_write+0x37f/0x5c0 fs/aio.c:1574
 __io_submit_one fs/aio.c:1858 [inline]
 io_submit_one+0xecd/0x20c0 fs/aio.c:1909
 __do_sys_io_submit fs/aio.c:1953 [inline]
 __se_sys_io_submit+0x11b/0x4a0 fs/aio.c:1924
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x443ea9
Code: e8 5c 0b 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdb3402108 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000443ea9
RDX: 0000000020000080 RSI: 0000000000000001 RDI: 00007fc68ccd8000
RBP: 00316e616c767069 R08: 0000001e00000140 R09: 0000001e00000140
R10: 0000001e00000140 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000040 R15: 0000000000000004

Allocated by task 1:
 kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
 kmem_cache_zalloc include/linux/slab.h:699 [inline]
 __alloc_file+0x21/0x330 fs/file_table.c:100
 alloc_empty_file+0x6d/0x170 fs/file_table.c:150
 path_openat+0xe9/0x2df0 fs/namei.c:3526
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_sys_open+0x3b3/0x520 fs/open.c:1085
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9:
 __cache_free mm/slab.c:3503 [inline]
 kmem_cache_free+0x7f/0x260 mm/slab.c:3765
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2584 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
 rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881
 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880aaf6d300
 which belongs to the cache filp of size 456
The buggy address is located 55 bytes to the right of
 456-byte region [ffff8880aaf6d300, ffff8880aaf6d4c8)
The buggy address belongs to the page:
page:ffffea0002abdb40 count:1 mapcount:0 mapping:ffff88823b846200 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002acc108 ffffea0002aba008 ffff88823b846200
raw: 0000000000000000 ffff8880aaf6d080 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880aaf6d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880aaf6d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880aaf6d480: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
                                                                ^
 ffff8880aaf6d500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880aaf6d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/12/14 04:33 linux-4.19.y 13d2ce42de8c 8f160dd5 .config console log report syz C ci2-linux-4-19
2020/11/30 08:35 linux-4.19.y 0c88e405c97e a0092f9d .config console log report syz C ci2-linux-4-19
2023/02/08 09:12 linux-4.19.y 3f8a27f9e27b 15c3d445 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in ipvlan_queue_xmit
2021/08/09 18:04 linux-4.19.y 5c66974a6304 6972b106 .config console log report info ci2-linux-4-19 KASAN: slab-out-of-bounds Read in ipvlan_queue_xmit
* Struck through repros no longer work on HEAD.