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KASAN: use-after-free Read in sock_def_write_space (2)

Status: fixed on 2020/09/16 22:51
Subsystems: net arm-msm
[Documentation on labels]
Reported-by: syzbot+6720d64f31c081c2f708@syzkaller.appspotmail.com
Fix commit: af9f691f0f5b qrtr: orphan socket in qrtr_release()
First crash: 1929d, last: 1871d
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (6)
Title Replies (including bot) Last reply
[PATCH 5.4 00/19] 5.4.55-rc1 review 24 (24) 2020/07/31 17:15
[PATCH 5.7 00/20] 5.7.12-rc1 review 24 (24) 2020/07/31 17:15
[PATCH 4.19 00/17] 4.19.136-rc1 review 20 (20) 2020/07/31 12:00
[Patch net v2] qrtr: orphan socket in qrtr_release() 3 (3) 2020/07/25 00:31
[Patch net] qrtr: orphan skb before queuing in xmit 5 (5) 2020/07/24 06:10
KASAN: use-after-free Read in sock_def_write_space (2) 0 (1) 2020/07/21 04:41
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in sock_def_write_space (3) intel-wired-lan 19 21 1625d 1862d 0/29 auto-closed as invalid on 2021/08/18 10:16
linux-5.15 KASAN: use-after-free Read in sock_def_write_space (2) 19 1 695d 695d 0/3 auto-obsoleted due to no activity on 2024/03/15 00:45
upstream KASAN: use-after-free Read in sock_def_write_space (4) net virt 19 7 1274d 1442d 0/29 auto-closed as invalid on 2022/08/04 16:53
linux-5.15 KASAN: use-after-free Read in sock_def_write_space 19 1 828d 828d 0/3 auto-obsoleted due to no activity on 2023/11/03 11:19
upstream KASAN: use-after-free Read in sock_def_write_space net arm-msm 19 C done 67 1929d 2295d 15/29 fixed on 2020/07/20 08:03
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2020/07/24 14:18 16m xiyou.wangcong@gmail.com https://github.com/congwang/linux.git net OK
2020/07/24 02:40 16m xiyou.wangcong@gmail.com https://github.com/congwang/linux.git net OK

Sample crash report:
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: use-after-free in list_empty include/linux/list.h:282 [inline]
BUG: KASAN: use-after-free in waitqueue_active include/linux/wait.h:127 [inline]
BUG: KASAN: use-after-free in wq_has_sleeper include/linux/wait.h:161 [inline]
BUG: KASAN: use-after-free in skwq_has_sleeper include/net/sock.h:2143 [inline]
BUG: KASAN: use-after-free in sock_def_write_space+0x609/0x630 net/core/sock.c:2926
Read of size 8 at addr ffff8880866ed5c0 by task syz-executor525/6922

CPU: 1 PID: 6922 Comm: syz-executor525 Not tainted 5.8.0-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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 list_empty include/linux/list.h:282 [inline]
 waitqueue_active include/linux/wait.h:127 [inline]
 wq_has_sleeper include/linux/wait.h:161 [inline]
 skwq_has_sleeper include/net/sock.h:2143 [inline]
 sock_def_write_space+0x609/0x630 net/core/sock.c:2926
 sock_wfree+0x1cc/0x240 net/core/sock.c:2060
 skb_release_head_state+0x9f/0x250 net/core/skbuff.c:651
 skb_release_all net/core/skbuff.c:662 [inline]
 __kfree_skb net/core/skbuff.c:678 [inline]
 kfree_skb.part.0+0x89/0x350 net/core/skbuff.c:696
 kfree_skb+0x7d/0x100 include/linux/refcount.h:270
 skb_queue_purge+0x14/0x30 net/core/skbuff.c:3077
 qrtr_tun_release+0x40/0x60 net/qrtr/tun.c:118
 __fput+0x33c/0x880 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:135
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:239 [inline]
 __prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:269
 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x401040
Code: Bad RIP value.
RSP: 002b:00007ffdd92190e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 0000000000401040
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000006
RBP: 00007ffdd92190f0 R08: 0000000120080522 R09: 0000000120080522
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a5ff0
R13: 0000000000402150 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 6922:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x12c/0x3b0 mm/slab.c:3484
 sock_alloc_inode+0x18/0x1c0 net/socket.c:253
 alloc_inode+0x61/0x230 fs/inode.c:232
 new_inode_pseudo+0x14/0xe0 fs/inode.c:928
 sock_alloc+0x3c/0x260 net/socket.c:573
 __sock_create+0xb9/0x740 net/socket.c:1392
 sock_create net/socket.c:1479 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1521
 __do_sys_socket net/socket.c:1530 [inline]
 __se_sys_socket net/socket.c:1528 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1528
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 0:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kmem_cache_free+0x7f/0x310 mm/slab.c:3694
 i_callback+0x3f/0x70 fs/inode.c:221
 rcu_do_batch kernel/rcu/tree.c:2414 [inline]
 rcu_core+0x5c7/0x1160 kernel/rcu/tree.c:2641
 __do_softirq+0x34c/0xa60 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880866ed540
 which belongs to the cache sock_inode_cache of size 1216
The buggy address is located 128 bytes inside of
 1216-byte region [ffff8880866ed540, ffff8880866eda00)
The buggy address belongs to the page:
page:ffffea000219bb40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880866edffd
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000219bb08 ffff8880a9751d50 ffff88821b77f700
raw: ffff8880866edffd ffff8880866ed000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880866ed480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880866ed500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8880866ed580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8880866ed600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880866ed680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/07/25 00:43 upstream f37e99aca03f 554af388 .config console log report syz C ci-upstream-kasan-gce-root
2020/07/24 19:04 upstream f37e99aca03f 554af388 .config console log report syz C ci-upstream-kasan-gce-selinux-root
2020/07/23 06:27 upstream 8c26c87b0532 340ea530 .config console log report syz C ci-upstream-kasan-gce-smack-root
2020/07/22 20:26 upstream 4fa640dc5230 128cd85f .config console log report syz C ci-upstream-kasan-gce
2020/07/20 18:56 upstream 5714ee50bb43 4285ffa3 .config console log report syz C ci-upstream-kasan-gce-386
2020/07/24 23:36 linux-next 26027945c94a 554af388 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2020/09/16 09:06 upstream fc4f28bb3daf 18d7d030 .config console log report info ci-qemu-upstream
2020/09/12 10:46 upstream 729e3d091984 21d289c2 .config console log report ci-qemu-upstream
2020/09/11 20:31 upstream e8878ab82545 79fb24e2 .config console log report ci-qemu-upstream
2020/09/09 06:19 upstream fffe3ae0ee84 0ea7a887 .config console log report ci-qemu-upstream
2020/09/08 07:26 upstream fffe3ae0ee84 abf9ba4f .config console log report ci-qemu-upstream
2020/09/08 06:39 upstream fffe3ae0ee84 abf9ba4f .config console log report ci-qemu-upstream
2020/09/06 23:59 upstream fffe3ae0ee84 abf9ba4f .config console log report ci-qemu-upstream
2020/09/05 16:29 upstream fffe3ae0ee84 abf9ba4f .config console log report ci-qemu-upstream
2020/09/03 23:59 upstream fffe3ae0ee84 abf9ba4f .config console log report ci-qemu-upstream
2020/08/07 02:35 upstream fffe3ae0ee84 cb436c69 .config console log report ci-qemu-upstream
2020/07/25 07:06 upstream 68845a55c31b 1f7cc1ca .config console log report ci-upstream-kasan-gce-root
2020/07/23 17:47 upstream d15be546031c 70c104a1 .config console log report ci-upstream-kasan-gce
2020/07/23 16:35 upstream d15be546031c 70c104a1 .config console log report ci-qemu-upstream
2020/09/07 11:45 upstream f4d51dffc6c0 abf9ba4f .config console log report ci-qemu-upstream-386
2020/08/19 03:47 upstream 00e4db51259a e1c29030 .config console log report ci-qemu-upstream-386
2020/07/20 18:33 upstream 5714ee50bb43 4285ffa3 .config console log report ci-upstream-kasan-gce-386
2020/09/05 21:28 net-old cc8e58f8325c abf9ba4f .config console log report ci-upstream-net-this-kasan-gce
2020/09/01 03:45 net-old bb8872a1e6bc d5a3ae1f .config console log report ci-upstream-net-this-kasan-gce
2020/08/01 03:25 net-old 85496a292241 d895b3be .config console log report ci-upstream-net-this-kasan-gce
2020/09/12 16:21 net-next-old 5a6bd84f8154 ce441f06 .config console log report ci-upstream-net-kasan-gce
2020/09/01 08:39 net-next-old c30a3c957c88 d5a3ae1f .config console log report ci-upstream-net-kasan-gce
2020/08/11 00:28 net-next-old bfdd5aaa54b0 7adc7b65 .config console log report ci-upstream-net-kasan-gce
2020/08/04 00:48 net-next-old bd0b33b24897 196277c4 .config console log report ci-upstream-net-kasan-gce
* Struck through repros no longer work on HEAD.