syzbot

 sign-in | mailing list | source | docs
🐞 Open [712]
🐞 Fixed [297]
🐞 Invalid [838]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

KASAN: use-after-free Read in geneve_xmit

Status: auto-obsoleted due to no activity on 2023/01/16 22:54
Reported-by: syzbot+16dc7fc7b73d33497fad@syzkaller.appspotmail.com
First crash: 814d, last: 814d
▶ ▼ Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: slab-out-of-bounds Read in geneve_xmit 3 34d 41d 0/3 upstream: reported on 2024/10/31 02:05
upstream KMSAN: kernel-infoleak in copyout (2) net C 6723 552d 1721d 22/28 fixed on 2023/06/08 14:41
upstream KMSAN: uninit-value in geneve_xmit (3) net C 14 244d 252d 25/28 fixed on 2024/05/23 00:06
upstream KASAN: slab-out-of-bounds Read in geneve_xmit net 1 1130d 1130d 0/28 auto-closed as invalid on 2022/02/05 16:18
upstream KMSAN: kernel-infoleak in _copy_to_iter (7) net C 138977 656d 1008d 22/28 fixed on 2023/02/24 13:50
upstream KMSAN: uninit-value in geneve_xmit (2) net C 12 265d 342d 25/28 fixed on 2024/03/26 00:54

Sample crash report:
netlink: 'syz-executor.1': attribute type 1 has an invalid length.
IPVS: ftp: loaded support on port[0] = 21
IPv6: ADDRCONF(NETDEV_UP): bond38: link is not ready
8021q: adding VLAN 0 to HW filter on device bond38
==================================================================
BUG: KASAN: use-after-free in geneve6_xmit_skb drivers/net/geneve.c:911 [inline]
BUG: KASAN: use-after-free in geneve_xmit+0x27d4/0x2e60 drivers/net/geneve.c:940
Read of size 8 at addr ffff88803e870a20 by task syz-executor.2/30431

CPU: 1 PID: 30431 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 geneve6_xmit_skb drivers/net/geneve.c:911 [inline]
 geneve_xmit+0x27d4/0x2e60 drivers/net/geneve.c:940
 __netdev_start_xmit include/linux/netdevice.h:4349 [inline]
 netdev_start_xmit include/linux/netdevice.h:4363 [inline]
 xmit_one net/core/dev.c:3256 [inline]
 dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272
 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838
 neigh_hh_output include/net/neighbour.h:491 [inline]
 neigh_output include/net/neighbour.h:499 [inline]
 ip6_finish_output2+0xde7/0x2290 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x89b/0x10f0 net/ipv6/ip6_output.c:192
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209
 dst_output include/net/dst.h:455 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 mld_sendpack+0x674/0x1060 net/ipv6/mcast.c:1681
 mld_send_initial_cr.part.0+0x106/0x150 net/ipv6/mcast.c:2098
 mld_send_initial_cr net/ipv6/mcast.c:1196 [inline]
 mld_dad_timer_expire+0x183/0x5e0 net/ipv6/mcast.c:2117
 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338
 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375
 __run_timers kernel/time/timer.c:1696 [inline]
 run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709
 __do_softirq+0x265/0x980 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:263 [inline]
RIP: 0010:__rcu_read_unlock+0xcc/0x160 kernel/rcu/tree_plugin.h:427
Code: 8c 00 00 00 c7 83 70 03 00 00 00 00 00 80 48 8d bb 74 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 62 8b 83 74 03 00
RSP: 0018:ffff88809db2fa30 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8880987cc280 RCX: ffffc90007677000
RDX: 0000000000000000 RSI: ffffffff81d86cc1 RDI: ffff8880987cc5f4
RBP: ffff8880987cc5f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ae237a80
R13: 0000000000000000 R14: ffff8880a3d3ebc0 R15: 0000000000000000
 rcu_read_unlock include/linux/rcupdate.h:680 [inline]
 ext4_get_group_desc+0x1d6/0x4e0 fs/ext4/balloc.c:284
 recently_deleted fs/ext4/ialloc.c:680 [inline]
 find_inode_bit+0x1a0/0x520 fs/ext4/ialloc.c:724
 __ext4_new_inode+0x160c/0x5a20 fs/ext4/ialloc.c:916
 ext4_mkdir+0x396/0xe10 fs/ext4/namei.c:2696
 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819
 do_mkdirat+0x262/0x2d0 fs/namei.c:3842
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ff87069c409
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff86f011168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ff8707aef80 RCX: 00007ff87069c409
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'.
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 00000000200005c0
RBP: 00007ff8706f7367 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca85e6d7f R14: 00007ff86f011300 R15: 0000000000022000

Allocated by task 30350:
 kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
 sock_alloc_inode+0x19/0x250 net/socket.c:244
 alloc_inode+0x5d/0x180 fs/inode.c:211
 new_inode_pseudo+0x14/0xe0 fs/inode.c:911
 sock_alloc+0x3c/0x260 net/socket.c:567
 __sock_create+0xba/0x740 net/socket.c:1329
 udp_sock_create6+0xd1/0x550 net/ipv6/ip6_udp_tunnel.c:22
 udp_sock_create include/net/udp_tunnel.h:61 [inline]
 geneve_create_sock drivers/net/geneve.c:409 [inline]
 geneve_socket_create drivers/net/geneve.c:524 [inline]
 geneve_sock_add+0x883/0xee0 drivers/net/geneve.c:610
 geneve_open+0x9a/0x1c0 drivers/net/geneve.c:646
 __dev_open+0x207/0x3a0 net/core/dev.c:1402
 __dev_change_flags+0x501/0x660 net/core/dev.c:7679
 dev_change_flags+0x7e/0x140 net/core/dev.c:7748
 devinet_ioctl+0x13c9/0x1b40 net/ipv4/devinet.c:1106
 inet_ioctl+0x1ea/0x360 net/ipv4/af_inet.c:954
 sock_do_ioctl+0xce/0x300 net/socket.c:1015
 sock_ioctl+0x2ef/0x5d0 net/socket.c:1135
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 30427:
 __cache_free mm/slab.c:3503 [inline]
 kmem_cache_free+0x7f/0x260 mm/slab.c:3765
 destroy_inode+0xb9/0x110 fs/inode.c:268
 iput_final fs/inode.c:1555 [inline]
 iput+0x4f1/0x860 fs/inode.c:1581
 __sock_release net/socket.c:611 [inline]
 sock_release+0x174/0x1d0 net/socket.c:619
 __geneve_sock_release.part.0+0x15d/0x1e0 drivers/net/geneve.c:558
 __geneve_sock_release drivers/net/geneve.c:578 [inline]
 geneve_sock_release+0x1bf/0x290 drivers/net/geneve.c:576
 geneve_stop+0x198/0x200 drivers/net/geneve.c:667
 __dev_close_many+0x1ab/0x2e0 net/core/dev.c:1485
 __dev_close net/core/dev.c:1497 [inline]
 __dev_change_flags+0x273/0x660 net/core/dev.c:7677
 dev_change_flags+0x7e/0x140 net/core/dev.c:7748
 devinet_ioctl+0x13c9/0x1b40 net/ipv4/devinet.c:1106
 inet_ioctl+0x1ea/0x360 net/ipv4/af_inet.c:954
 sock_do_ioctl+0xce/0x300 net/socket.c:1015
 sock_ioctl+0x2ef/0x5d0 net/socket.c:1135
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88803e870a00
 which belongs to the cache sock_inode_cache of size 992
The buggy address is located 32 bytes inside of
 992-byte region [ffff88803e870a00, ffff88803e870de0)
The buggy address belongs to the page:
page:ffffea0000fa1c00 count:1 mapcount:0 mapping:ffff8880b59c3240 index:0xffff88803e870ffd
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002266448 ffffea000139bac8 ffff8880b59c3240
raw: ffff88803e870ffd ffff88803e870100 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88803e870900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88803e870980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803e870a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88803e870a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803e870b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	8c 00                	mov    %es,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	c7 83 70 03 00 00 00 	movl   $0x80000000,0x370(%rbx)
   b:	00 00 80
   e:	48 8d bb 74 03 00 00 	lea    0x374(%rbx),%rdi
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	48 89 fa             	mov    %rdi,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
* 2a:	48 89 f8             	mov    %rdi,%rax <-- trapping instruction
  2d:	83 e0 07             	and    $0x7,%eax
  30:	83 c0 03             	add    $0x3,%eax
  33:	38 d0                	cmp    %dl,%al
  35:	7c 04                	jl     0x3b
  37:	84 d2                	test   %dl,%dl
  39:	75 62                	jne    0x9d
  3b:	8b                   	.byte 0x8b
  3c:	83                   	.byte 0x83
  3d:	74 03                	je     0x42

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/09/18 22:53 linux-4.19.y 3f8a27f9e27b dd9a85ff .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: use-after-free Read in geneve_xmit
* Struck through repros no longer work on HEAD.