syzbot


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

Status: fixed on 2020/02/18 14:31
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+827ced406c9a1d9570ed@syzkaller.appspotmail.com
Fix commit: 32c72165dbd0 netfilter: ipset: use bitmap infrastructure completely
First crash: 1616d, last: 1600d
Discussions (8)
Title Replies (including bot) Last reply
[PATCH 4.19 00/92] 4.19.100-stable review 98 (98) 2020/01/31 13:57
[PATCH 4.9 000/271] 4.9.212-stable review 283 (283) 2020/01/29 22:35
[PATCH 5.4 000/104] 5.4.16-stable review 113 (113) 2020/01/29 15:36
[PATCH 4.14 00/46] 4.14.169-stable review 51 (51) 2020/01/29 14:42
[PATCH 4.4 000/183] 4.4.212-stable review 190 (190) 2020/01/29 13:12
[PATCH 0/7] Netfilter fixes for net 9 (9) 2020/01/25 20:40
[PATCH 1/1] netfilter: ipset: use bitmap infrastructure completely 2 (2) 2020/01/20 16:42
KASAN: slab-out-of-bounds Read in bitmap_ip_list 0 (1) 2020/01/18 07:57

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
BUG: KASAN: slab-out-of-bounds in bitmap_ip_list+0x40f/0xf20 net/netfilter/ipset/ip_set_bitmap_gen.h:222
Read of size 8 at addr ffff8880a7b3c500 by task syz-executor506/10336

CPU: 0 PID: 10336 Comm: syz-executor506 Not tainted 5.5.0-rc6-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 __kasan_check_read+0x11/0x20 mm/kasan/common.c:95
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
 bitmap_ip_list+0x40f/0xf20 net/netfilter/ipset/ip_set_bitmap_gen.h:222
 ip_set_dump_start+0x96c/0x1ca0 net/netfilter/ipset/ip_set_core.c:1632
 netlink_dump+0x558/0xfb0 net/netlink/af_netlink.c:2244
 __netlink_dump_start+0x66a/0x930 net/netlink/af_netlink.c:2352
 netlink_dump_start include/linux/netlink.h:233 [inline]
 ip_set_dump+0x15a/0x1d0 net/netfilter/ipset/ip_set_core.c:1690
 nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:659
 ____sys_sendmsg+0x753/0x880 net/socket.c:2330
 ___sys_sendmsg+0x100/0x170 net/socket.c:2384
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2417
 __do_sys_sendmsg net/socket.c:2426 [inline]
 __se_sys_sendmsg net/socket.c:2424 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440569
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffda8ba3b78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440569
RDX: 0000000000000010 RSI: 00000000200003c0 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401df0
R13: 0000000000401e80 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 10336:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x163/0x770 mm/slab.c:3665
 kmalloc include/linux/slab.h:561 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 ip_set_alloc+0x38/0x5e net/netfilter/ipset/ip_set_core.c:255
 init_map_ip net/netfilter/ipset/ip_set_bitmap_ip.c:223 [inline]
 bitmap_ip_create+0x6ec/0xc20 net/netfilter/ipset/ip_set_bitmap_ip.c:327
 ip_set_create+0x6f1/0x1500 net/netfilter/ipset/ip_set_core.c:1111
 nfnetlink_rcv_msg+0xcf2/0xfb0 net/netfilter/nfnetlink.c:229
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 nfnetlink_rcv+0x1ba/0x460 net/netfilter/nfnetlink.c:563
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:659
 ____sys_sendmsg+0x753/0x880 net/socket.c:2330
 ___sys_sendmsg+0x100/0x170 net/socket.c:2384
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2417
 __do_sys_sendmsg net/socket.c:2426 [inline]
 __se_sys_sendmsg net/socket.c:2424 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2424
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 10108:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 security_cred_free+0xa9/0x110 security/security.c:1548
 put_cred_rcu+0x129/0x4b0 kernel/cred.c:114
 __put_cred+0x1ef/0x270 kernel/cred.c:148
 put_cred include/linux/cred.h:287 [inline]
 do_faccessat+0x693/0x7f0 fs/open.c:439
 __do_sys_access fs/open.c:450 [inline]
 __se_sys_access fs/open.c:448 [inline]
 __x64_sys_access+0x59/0x80 fs/open.c:448
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a7b3c500
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880a7b3c500, ffff8880a7b3c520)
The buggy address belongs to the page:
page:ffffea00029ecf00 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a7b3cfc1
raw: 00fffe0000000200 ffffea0002623e88 ffffea000269b348 ffff8880aa4001c0
raw: ffff8880a7b3cfc1 ffff8880a7b3c000 000000010000003d 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a7b3c400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a7b3c480: 00 00 01 fc fc fc fc fc 00 00 00 04 fc fc fc fc
>ffff8880a7b3c500: 04 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8880a7b3c580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a7b3c600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================

Crashes (85):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/01/20 00:24 upstream 8f8972a3127f 0342f8c7 .config console log report syz C ci-upstream-kasan-gce-selinux-root
2020/01/19 19:08 upstream 8f8972a3127f 0342f8c7 .config console log report syz C ci-upstream-kasan-gce-selinux-root
2020/01/19 19:03 upstream 8f8972a3127f 0342f8c7 .config console log report syz C ci-upstream-kasan-gce
2020/01/19 11:40 upstream 244dc2689085 bc8bc756 .config console log report syz C ci-upstream-kasan-gce-selinux-root
2020/01/19 11:17 upstream 244dc2689085 bc8bc756 .config console log report syz C ci-upstream-kasan-gce-root
2020/01/19 09:14 upstream 244dc2689085 bc8bc756 .config console log report syz C ci-upstream-kasan-gce
2020/01/19 06:26 upstream 244dc2689085 bc8bc756 .config console log report syz C ci-upstream-kasan-gce-root
2020/01/19 03:48 upstream 244dc2689085 bc8bc756 .config console log report syz C ci-upstream-kasan-gce-smack-root
2020/01/18 21:07 upstream 25e73aadf297 3de7aabb .config console log report syz C ci-upstream-kasan-gce-smack-root
2020/01/18 20:30 upstream 25e73aadf297 3de7aabb .config console log report syz C ci-upstream-kasan-gce-root
2020/01/18 15:13 upstream 25e73aadf297 3de7aabb .config console log report syz C ci-upstream-kasan-gce-smack-root
2020/01/19 10:01 upstream 244dc2689085 bc8bc756 .config console log report syz C ci-upstream-kasan-gce-386
2020/01/19 04:02 upstream 244dc2689085 bc8bc756 .config console log report syz C ci-upstream-kasan-gce-386
2020/01/18 18:02 upstream 25e73aadf297 3de7aabb .config console log report syz C ci-upstream-kasan-gce-386
2020/01/19 09:42 net-old e02d9c4c68dc bc8bc756 .config console log report syz C ci-upstream-net-this-kasan-gce
2020/01/19 04:40 net-old e02d9c4c68dc bc8bc756 .config console log report syz C ci-upstream-net-this-kasan-gce
2020/01/18 06:05 net-old 5a9ef19454cd 3de7aabb .config console log report syz C ci-upstream-net-this-kasan-gce
2020/01/18 20:41 net-next-old 9aaa29494030 3de7aabb .config console log report syz C ci-upstream-net-kasan-gce
2020/01/18 15:11 net-next-old 56f200c78ce4 3de7aabb .config console log report syz C ci-upstream-net-kasan-gce
2020/01/18 11:01 net-next-old 56f200c78ce4 3de7aabb .config console log report syz C ci-upstream-net-kasan-gce
2020/01/30 12:51 linux-next 2747d5fdab78 5ed23f9a .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2020/01/29 09:30 linux-next 2747d5fdab78 c8e81ce4 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2020/01/27 11:01 linux-next 2747d5fdab78 dd56146d .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2020/01/24 20:40 upstream 6381b442836e 2e95ab33 .config console log report ci-upstream-kasan-gce
2020/01/23 23:18 upstream 4703d9119972 2e95ab33 .config console log report ci-upstream-kasan-gce
2020/01/23 14:17 upstream 131701c697e8 3334d684 .config console log report ci-upstream-kasan-gce-smack-root
2020/01/21 09:25 upstream d96d875ef5dd 8eda0b95 .config console log report ci-upstream-kasan-gce-root
2020/01/20 15:07 upstream def9d2780727 d2557fb5 .config console log report ci-upstream-kasan-gce-selinux-root
2020/01/19 18:54 upstream 8f8972a3127f 0342f8c7 .config console log report ci-upstream-kasan-gce
2020/01/18 09:32 upstream 25e73aadf297 3de7aabb .config console log report ci-upstream-kasan-gce-smack-root
2020/01/22 18:11 upstream d96d875ef5dd 8eda0b95 .config console log report ci-upstream-kasan-gce-386
2020/01/21 06:21 upstream d96d875ef5dd 8eda0b95 .config console log report ci-upstream-kasan-gce-386
2020/01/19 01:40 upstream 244dc2689085 bc8bc756 .config console log report ci-upstream-kasan-gce-386
2020/01/18 15:01 upstream 25e73aadf297 3de7aabb .config console log report ci-upstream-kasan-gce-386
2020/01/18 13:54 upstream 25e73aadf297 3de7aabb .config console log report ci-upstream-kasan-gce-386
2020/01/25 19:16 net-old 61b1f2aff411 2e95ab33 .config console log report ci-upstream-net-this-kasan-gce
2020/01/25 10:43 net-old 61b1f2aff411 2e95ab33 .config console log report ci-upstream-net-this-kasan-gce
2020/01/25 09:34 net-old 623c8d5c74c6 2e95ab33 .config console log report ci-upstream-net-this-kasan-gce
2020/01/24 10:55 net-old 61678d28d4a4 2e95ab33 .config console log report ci-upstream-net-this-kasan-gce
2020/01/23 06:33 net-old 5311a69aaca3 3334d684 .config console log report ci-upstream-net-this-kasan-gce
2020/01/22 22:31 net-old 5311a69aaca3 3334d684 .config console log report ci-upstream-net-this-kasan-gce
2020/01/22 14:06 net-old d0f418516022 8eda0b95 .config console log report ci-upstream-net-this-kasan-gce
2020/01/22 11:11 net-old d0f418516022 8eda0b95 .config console log report ci-upstream-net-this-kasan-gce
2020/01/19 19:07 net-old 09d4f10a5e78 0342f8c7 .config console log report ci-upstream-net-this-kasan-gce
2020/01/19 12:48 net-old e02d9c4c68dc bc8bc756 .config console log report ci-upstream-net-this-kasan-gce
2020/01/19 08:21 net-old e02d9c4c68dc bc8bc756 .config console log report ci-upstream-net-this-kasan-gce
2020/01/18 23:18 net-old e02d9c4c68dc bc8bc756 .config console log report ci-upstream-net-this-kasan-gce
2020/01/18 20:22 net-old e02d9c4c68dc 3de7aabb .config console log report ci-upstream-net-this-kasan-gce
2020/01/18 08:18 net-old 5a9ef19454cd 3de7aabb .config console log report ci-upstream-net-this-kasan-gce
2020/01/18 07:40 net-old 5a9ef19454cd 3de7aabb .config console log report ci-upstream-net-this-kasan-gce
2020/01/18 04:02 net-old 5a9ef19454cd 3de7aabb .config console log report ci-upstream-net-this-kasan-gce
2020/01/22 18:19 net-next-old 4f2c17e0f332 8eda0b95 .config console log report ci-upstream-net-kasan-gce
2020/01/22 09:56 net-next-old 4f2c17e0f332 8eda0b95 .config console log report ci-upstream-net-kasan-gce
2020/01/20 13:39 net-next-old b3f7e3f23a76 d2557fb5 .config console log report ci-upstream-net-kasan-gce
2020/01/20 12:35 net-next-old b3f7e3f23a76 0342f8c7 .config console log report ci-upstream-net-kasan-gce
2020/01/20 06:53 net-next-old 7f013edebaa4 0342f8c7 .config console log report ci-upstream-net-kasan-gce
2020/01/20 02:35 net-next-old 7f013edebaa4 0342f8c7 .config console log report ci-upstream-net-kasan-gce
2020/01/19 20:43 net-next-old 7f013edebaa4 0342f8c7 .config console log report ci-upstream-net-kasan-gce
2020/01/19 14:41 net-next-old 7f013edebaa4 bc8bc756 .config console log report ci-upstream-net-kasan-gce
2020/01/19 11:30 net-next-old 9aaa29494030 bc8bc756 .config console log report ci-upstream-net-kasan-gce
2020/01/19 11:16 net-next-old 9aaa29494030 bc8bc756 .config console log report ci-upstream-net-kasan-gce
2020/01/18 22:51 net-next-old 9aaa29494030 bc8bc756 .config console log report ci-upstream-net-kasan-gce
2020/01/18 18:24 net-next-old 9aaa29494030 3de7aabb .config console log report ci-upstream-net-kasan-gce
2020/01/18 17:52 net-next-old 9aaa29494030 3de7aabb .config console log report ci-upstream-net-kasan-gce
2020/01/18 14:30 net-next-old 56f200c78ce4 3de7aabb .config console log report ci-upstream-net-kasan-gce
2020/01/18 09:15 net-next-old 56f200c78ce4 3de7aabb .config console log report ci-upstream-net-kasan-gce
2020/01/18 07:43 net-next-old 56f200c78ce4 3de7aabb .config console log report ci-upstream-net-kasan-gce
2020/02/03 17:20 linux-next 2747d5fdab78 93e5e335 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/02/03 10:46 linux-next 2747d5fdab78 93e5e335 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.