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KASAN: use-after-free Read in bpf_test_finish

Status: fixed on 2018/08/07 13:43
Subsystems: net bpf
[Documentation on labels]
Reported-by: syzbot+709412e651e55ed96498@syzkaller.appspotmail.com
Fix commit: 6e6fddc78323 bpf: fix panic due to oob in bpf_prog_test_run_skb
First crash: 2671d, last: 2656d
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH 4.14 00/45] 4.14.259-rc1 review 48 (48) 2021/12/21 23:12
[PATCH bpf] bpf: fix panic due to oob in bpf_prog_test_run_skb 2 (2) 2018/07/11 23:16
KASAN: use-after-free Read in bpf_test_finish 0 (1) 2018/07/09 06:19
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 KASAN: use-after-free Read in bpf_test_finish 19 C inconclusive 4 1977d 2280d 0/1 upstream: reported C repro on 2019/08/03 11:31
android-414 KASAN: use-after-free Read in bpf_test_finish 19 C 388 2250d 2395d 0/1 public: reported C repro on 2019/04/11 00:00

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KASAN: use-after-free in _copy_to_user+0xe9/0x110 lib/usercopy.c:27
Read of size 924 at addr ffff8801ab7ffff2 by task syz-executor173/4509

CPU: 1 PID: 4509 Comm: syz-executor173 Not tainted 4.18.0-rc4+ #144
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+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272
 _copy_to_user+0xe9/0x110 lib/usercopy.c:27
 copy_to_user include/linux/uaccess.h:155 [inline]
 bpf_test_finish.isra.7+0xee/0x1f0 net/bpf/test_run.c:59
 bpf_prog_test_run_skb+0x7d7/0xa30 net/bpf/test_run.c:144
 bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1686
 __do_sys_bpf kernel/bpf/syscall.c:2323 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:2267 [inline]
 __x64_sys_bpf+0x3d8/0x510 kernel/bpf/syscall.c:2267
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440269
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:00007ffe962cae98 EFLAGS: 00000213 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269
RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401af0
R13: 0000000000401b80 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0006adffc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 ffffea0006adffc8 ffffea0006adffc8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ab7ffe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801ab7fff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8801ab7fff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff8801ab800000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801ab800080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (1211):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/13 10:21 upstream 63f047771621 06c33b3a .config console log report syz C ci-upstream-kasan-gce-root
2018/07/13 04:58 upstream 63f047771621 06c33b3a .config console log report syz C ci-upstream-kasan-gce-root
2018/07/11 18:14 upstream 1e09177acae3 2e0e3130 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/11 12:02 upstream 1e09177acae3 2e0e3130 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/11 11:19 upstream 1e09177acae3 2e0e3130 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/10 13:21 upstream 092150a25cb7 9fa03fa5 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/10 12:58 upstream 092150a25cb7 9fa03fa5 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/10 12:29 upstream 092150a25cb7 9fa03fa5 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/10 09:46 upstream 092150a25cb7 9fa03fa5 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/09 05:45 upstream ca04b3cca11a f25e5770 .config console log report syz C ci-upstream-kasan-gce-root
2018/07/11 12:12 bpf 59ee4129a279 2e0e3130 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/11 03:13 bpf 59ee4129a279 2e0e3130 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 22:04 bpf f292b87d3ac0 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 13:56 bpf f292b87d3ac0 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 11:59 bpf f292b87d3ac0 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 10:52 bpf f292b87d3ac0 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 10:34 bpf f292b87d3ac0 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 06:42 bpf 7f93d1295131 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 05:33 bpf 7f93d1295131 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/09 05:11 bpf 7f93d1295131 f25e5770 .config console log report syz C ci-upstream-bpf-kasan-gce
2018/07/11 12:27 bpf-next d90c936fb318 2e0e3130 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/11 11:53 bpf-next d90c936fb318 2e0e3130 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/11 02:54 bpf-next d90c936fb318 2e0e3130 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 22:18 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 13:39 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 11:41 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 05:29 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 05:15 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 04:55 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 04:38 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/09 04:22 bpf-next d90c936fb318 f25e5770 .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/07/11 18:23 linux-next 98be45067040 2e0e3130 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2018/07/11 13:27 linux-next 98be45067040 2e0e3130 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2018/07/11 02:58 linux-next 3951bd9fe3e2 2e0e3130 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2018/07/11 01:00 linux-next 3951bd9fe3e2 2e0e3130 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2018/07/09 04:00 linux-next 526674536360 f25e5770 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2018/07/10 08:13 bpf-next d90c936fb318 f25e5770 .config console log report syz ci-upstream-bpf-next-kasan-gce
2018/07/09 03:44 upstream ca04b3cca11a f25e5770 .config console log report ci-upstream-kasan-gce-root
2018/07/12 04:19 bpf 61d769807f27 2e0e3130 .config console log report ci-upstream-bpf-kasan-gce
2018/07/23 16:57 bpf-next 8ae71e76cf1f f69c5fcd .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 15:30 bpf-next 8ae71e76cf1f f69c5fcd .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 12:45 bpf-next 8ae71e76cf1f f69c5fcd .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 11:37 bpf-next 8ae71e76cf1f f69c5fcd .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 09:39 bpf-next 8ae71e76cf1f f69c5fcd .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 08:04 bpf-next 8ae71e76cf1f f69c5fcd .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 07:01 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 03:59 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 02:49 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/23 01:13 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 23:53 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 22:30 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 20:00 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 17:57 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 17:06 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 15:06 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 13:51 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 12:30 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 10:06 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 08:50 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 07:38 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 03:54 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 02:50 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 02:47 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/22 00:10 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 21:10 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 19:38 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 18:13 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 15:45 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 14:41 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 12:52 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 11:36 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/21 03:38 net-next-old eecd6857709e af255b09 .config console log report ci-upstream-net-kasan-gce
2018/07/21 03:05 bpf-next 8ae71e76cf1f af255b09 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/20 21:37 bpf-next 8ae71e76cf1f af255b09 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/20 20:09 bpf-next 8ae71e76cf1f af255b09 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/20 17:52 bpf-next 8ae71e76cf1f 49f35839 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/20 16:51 bpf-next 8ae71e76cf1f 49f35839 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/20 15:39 bpf-next 8ae71e76cf1f 49f35839 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/20 14:37 bpf-next 8ae71e76cf1f 49f35839 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/20 14:17 bpf-next 8ae71e76cf1f 49f35839 .config console log report ci-upstream-bpf-next-kasan-gce
2018/07/09 11:12 linux-next d00d6d9a339d f25e5770 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.