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 tls_write_space

Status: fixed on 2021/01/29 07:30
Reported-by: syzbot+3e993c7003fc297efdbe@syzkaller.appspotmail.com
Fix commit: d71f3fb99620 net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails
First crash: 2394d, last: 1769d
Fix bisection: fixed by (bisect log) :
commit d71f3fb99620532fee0d163bfb30f0cc7bcdbaee
Author: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Date: Mon Oct 5 13:29:58 2020 +0000

  net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails

  
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in tls_write_space net 19 C 924 2281d 2676d 0/29 closed as dup on 2019/08/19 21:22
linux-4.14 KASAN: use-after-free Read in tls_write_space 19 C error 283 1228d 2382d 0/1 upstream: reported C repro on 2019/04/26 18:51
▶ ▼ Fix bisection attempts (15)
Created Duration User Patch Repo Result
2021/01/29 01:01 5h04m bisect fix linux-4.19.y OK (1) job log
2020/12/30 00:32 28m bisect fix linux-4.19.y OK (0) job log log
2020/11/29 14:59 31m bisect fix linux-4.19.y OK (0) job log log
2020/10/30 13:16 30m bisect fix linux-4.19.y OK (0) job log log
2020/09/30 12:45 31m bisect fix linux-4.19.y OK (0) job log log
2020/08/31 12:11 34m bisect fix linux-4.19.y OK (0) job log log
2020/08/01 11:37 33m bisect fix linux-4.19.y OK (0) job log log
2020/07/02 11:07 30m bisect fix linux-4.19.y OK (0) job log log
2020/06/02 09:55 31m bisect fix linux-4.19.y OK (0) job log log
2020/05/03 09:22 32m bisect fix linux-4.19.y OK (0) job log log
2020/04/03 08:52 30m bisect fix linux-4.19.y OK (0) job log log
2020/03/04 08:18 33m bisect fix linux-4.19.y OK (0) job log log
2020/02/03 07:39 32m bisect fix linux-4.19.y OK (0) job log log
2020/01/04 07:07 31m bisect fix linux-4.19.y OK (0) job log log
2019/12/05 06:36 31m bisect fix linux-4.19.y OK (0) job log log

Sample crash report:
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000001 R09: 00007fff6d160033
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ec0
R13: 0000000000401f50 R14: 0000000000000000 R15: 0000000000000000
==================================================================
BUG: KASAN: use-after-free in tls_write_space+0x2b2/0x310 net/tls/tls_main.c:220
Read of size 1 at addr ffff88809ecae8a0 by task syz-executor758/8044

CPU: 1 PID: 8044 Comm: syz-executor758 Not tainted 4.19.48 #20
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 tls_write_space+0x2b2/0x310 net/tls/tls_main.c:220
 tcp_new_space net/ipv4/tcp_input.c:5141 [inline]
 tcp_check_space+0x430/0x720 net/ipv4/tcp_input.c:5152
 tcp_data_snd_check net/ipv4/tcp_input.c:5162 [inline]
 tcp_rcv_established+0x9e9/0x1f10 net/ipv4/tcp_input.c:5653
 tcp_v4_do_rcv+0x616/0x8d0 net/ipv4/tcp_ipv4.c:1535
 sk_backlog_rcv include/net/sock.h:941 [inline]
 __release_sock+0x129/0x3a0 net/core/sock.c:2337
 release_sock+0x59/0x1c0 net/core/sock.c:2853
 tls_sk_proto_close+0x691/0xa20 net/tls/tls_main.c:309
 inet_release+0xff/0x1e0 net/ipv4/af_inet.c:428
 __sock_release+0x1f4/0x2a0 net/socket.c:579
 sock_release+0x18/0x20 net/socket.c:599
 smc_release+0x2c1/0x810 net/smc/af_smc.c:156
 __sock_release+0xce/0x2a0 net/socket.c:579
 sock_close+0x1b/0x30 net/socket.c:1140
 __fput+0x2dd/0x8b0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x933/0x2fa0 kernel/exit.c:876
 do_group_exit+0x135/0x370 kernel/exit.c:979
 __do_sys_exit_group kernel/exit.c:990 [inline]
 __se_sys_exit_group kernel/exit.c:988 [inline]
 __x64_sys_exit_group+0x44/0x50 kernel/exit.c:988
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x43f298
Code: Bad RIP value.
RSP: 002b:00007fff6d16b188 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f298
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004bf068 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8044:
 save_stack+0x45/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc mm/kasan/kasan.c:553 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
 kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 create_ctx+0x46/0x1f0 net/tls/tls_main.c:550
 tls_init+0x158/0x7a0 net/tls/tls_main.c:683
 tcp_set_ulp+0x216/0x5f0 net/ipv4/tcp_ulp.c:155
 do_tcp_setsockopt.isra.0+0x321/0x2320 net/ipv4/tcp.c:2750
 tcp_setsockopt+0xbe/0xe0 net/ipv4/tcp.c:3064
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3044
 smc_setsockopt+0xcb/0x790 net/smc/af_smc.c:1652
 __sys_setsockopt+0x17a/0x280 net/socket.c:1901
 __do_sys_setsockopt net/socket.c:1912 [inline]
 __se_sys_setsockopt net/socket.c:1909 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1909
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8044:
 save_stack+0x45/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcf/0x220 mm/slab.c:3822
 tls_ctx_free.part.0+0x32/0x40 net/tls/tls_main.c:251
 tls_ctx_free net/tls/tls_main.c:246 [inline]
 tls_sk_proto_close+0x684/0xa20 net/tls/tls_main.c:304
 inet_release+0xff/0x1e0 net/ipv4/af_inet.c:428
 __sock_release+0x1f4/0x2a0 net/socket.c:579
 sock_release+0x18/0x20 net/socket.c:599
 smc_release+0x2c1/0x810 net/smc/af_smc.c:156
 __sock_release+0xce/0x2a0 net/socket.c:579
 sock_close+0x1b/0x30 net/socket.c:1140
 __fput+0x2dd/0x8b0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x933/0x2fa0 kernel/exit.c:876
 do_group_exit+0x135/0x370 kernel/exit.c:979
 __do_sys_exit_group kernel/exit.c:990 [inline]
 __se_sys_exit_group kernel/exit.c:988 [inline]
 __x64_sys_exit_group+0x44/0x50 kernel/exit.c:988
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809ecae7c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 224 bytes inside of
 512-byte region [ffff88809ecae7c0, ffff88809ecae9c0)
The buggy address belongs to the page:
page:ffffea00027b2b80 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffffea00026d1a08 ffffea00027c1748 ffff88812c3f0940
raw: 0000000000000000 ffff88809ecae040 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809ecae780: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff88809ecae800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809ecae880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88809ecae900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809ecae980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================

Crashes (25):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/06/05 18:48 linux-4.19.y e109a984cf38 bfb4a51e .config console log report syz C ci2-linux-4-19
2019/08/03 15:10 linux-4.19.y 9a9de33a9dfa 6affd8e8 .config console log report syz ci2-linux-4-19
2019/04/14 20:25 linux-4.19.y 4d552acf3370 505ab413 .config console log report syz ci2-linux-4-19
2019/09/05 09:58 linux-4.19.y 97ab07e11fbf 040fda58 .config console log report ci2-linux-4-19
2019/09/02 17:02 linux-4.19.y 97ab07e11fbf 14544a56 .config console log report ci2-linux-4-19
2019/09/02 16:53 linux-4.19.y 97ab07e11fbf 14544a56 .config console log report ci2-linux-4-19
2019/09/02 16:15 linux-4.19.y 97ab07e11fbf 14544a56 .config console log report ci2-linux-4-19
2019/09/02 03:06 linux-4.19.y 97ab07e11fbf bad3cce2 .config console log report ci2-linux-4-19
2019/08/30 20:17 linux-4.19.y 97ab07e11fbf 9adfa876 .config console log report ci2-linux-4-19
2019/08/28 17:46 linux-4.19.y def4c11b3131 1eb076e9 .config console log report ci2-linux-4-19
2019/08/28 06:25 linux-4.19.y def4c11b3131 fd37b39e .config console log report ci2-linux-4-19
2019/08/27 05:44 linux-4.19.y def4c11b3131 d21c5d9d .config console log report ci2-linux-4-19
2019/08/26 08:35 linux-4.19.y def4c11b3131 d21c5d9d .config console log report ci2-linux-4-19
2019/08/23 01:57 linux-4.19.y a5aa80588fcd ca6f3cfa .config console log report ci2-linux-4-19
2019/08/21 23:05 linux-4.19.y a5aa80588fcd 4ea67ff8 .config console log report ci2-linux-4-19
2019/08/21 12:32 linux-4.19.y a5aa80588fcd 4ea67ff8 .config console log report ci2-linux-4-19
2019/08/19 08:00 linux-4.19.y a5aa80588fcd b8ceabfc .config console log report ci2-linux-4-19
2019/07/29 20:24 linux-4.19.y 64f4694072aa f67095ee .config console log report ci2-linux-4-19
2019/07/24 05:02 linux-4.19.y be9b6782a9eb de453f34 .config console log report ci2-linux-4-19
2019/06/27 10:04 linux-4.19.y aec3002d07fd 7509bf36 .config console log report ci2-linux-4-19
2019/06/19 02:17 linux-4.19.y 6500aa436df4 34bf9440 .config console log report ci2-linux-4-19
2019/06/11 06:17 linux-4.19.y bb7b450e61a1 0159583c .config console log report ci2-linux-4-19
2019/06/09 20:53 linux-4.19.y bb7b450e61a1 0159583c .config console log report ci2-linux-4-19
2019/06/09 16:00 linux-4.19.y bb7b450e61a1 0159583c .config console log report ci2-linux-4-19
2019/06/05 18:16 linux-4.19.y e109a984cf38 bfb4a51e .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.