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

Status: upstream: reported C repro on 2020/09/20 23:06
Subsystems: bfs
[Documentation on labels]
Reported-by: syzbot+4a7862ef35b29668a95a@syzkaller.appspotmail.com
First crash: 1552d, last: 656d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in find_first_zero_bit bfs C done 1 2457d 2456d 13/28 fixed on 2019/11/08 08:43
linux-4.14 KASAN: slab-out-of-bounds Read in find_first_zero_bit bfs C 1400 655d 1552d 0/1 upstream: reported C repro on 2020/09/20 22:54
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2020/12/21 03:28 24m bisect fix linux-4.19.y OK (0) job log log

Sample crash report:
BFS-fs: bfs_fill_super(): loop0 is unclean, continuing
==================================================================
BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
Read of size 8 at addr ffff8880a9fc86c0 by task syz-executor280/8110

CPU: 0 PID: 8110 Comm: syz-executor280 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 __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
 find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
 bfs_create+0xfb/0x610 fs/bfs/dir.c:91
 vfs_create+0x461/0x6c0 fs/namei.c:2913
 do_mknodat.part.0+0x2ff/0x480 fs/namei.c:3768
 do_mknodat fs/namei.c:3795 [inline]
 __do_sys_mknod fs/namei.c:3797 [inline]
 __se_sys_mknod fs/namei.c:3795 [inline]
 __x64_sys_mknod+0xf8/0x120 fs/namei.c:3795
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f4c62f637d9
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffda2fc7f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f4c62f637d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 0000000000000000 R08: 0000000000000002 R09: 00007f4c62fd0ec0
R10: 00007ffda2fc7df0 R11: 0000000000000246 R12: 00007ffda2fc7f50
R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000

Allocated by task 8110:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 bfs_fill_super+0x447/0xec0 fs/bfs/inode.c:363
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 52:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 rh_call_control drivers/usb/core/hcd.c:728 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:838 [inline]
 usb_hcd_submit_urb+0xb93/0x23c0 drivers/usb/core/hcd.c:1651
 usb_submit_urb+0xb2f/0x13b0 drivers/usb/core/urb.c:571
 usb_start_wait_urb+0x108/0x4c0 drivers/usb/core/message.c:57
 usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
 usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
 get_port_status drivers/usb/core/hub.c:577 [inline]
 hub_ext_port_status+0x112/0x4b0 drivers/usb/core/hub.c:594
 hub_port_status drivers/usb/core/hub.c:616 [inline]
 hub_activate+0x50f/0x1a40 drivers/usb/core/hub.c:1098
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

The buggy address belongs to the object at ffff8880a9fc86c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880a9fc86c0, ffff8880a9fc86e0)
The buggy address belongs to the page:
page:ffffea0002a7f200 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880a9fc8fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002a7ee48 ffffea0002a6c288 ffff88813bff01c0
raw: ffff8880a9fc8fc1 ffff8880a9fc8000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a9fc8580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a9fc8600: fb fb fb fb fc fc fc fc 00 03 fc fc fc fc fc fc
>ffff8880a9fc8680: fb fb fb fb fc fc fc fc 07 fc fc fc fc fc fc fc
                                           ^
 ffff8880a9fc8700: 00 03 fc fc fc fc fc fc 00 00 fc fc fc fc fc fc
 ffff8880a9fc8780: 00 00 fc fc fc fc fc fc 00 00 fc fc fc fc fc fc
==================================================================

Crashes (1755):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/30 08:33 linux-4.19.y 3f8a27f9e27b 2a71366b .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2022/10/21 13:45 linux-4.19.y 3f8a27f9e27b 63e790dd .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2022/08/23 07:37 linux-4.19.y 3f8a27f9e27b 26a13b38 .config console log report syz C ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2022/08/21 22:55 linux-4.19.y 3f8a27f9e27b 26a13b38 .config console log report syz C ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2022/05/13 00:54 linux-4.19.y 3f8a27f9e27b 9ad6612a .config console log report syz C ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2020/10/05 18:11 linux-4.19.y b09c34517e1a 1880b4a9 .config console log report syz C ci2-linux-4-19
2020/09/20 23:22 linux-4.19.y 015e94d0e37b 9564d2e9 .config console log report syz C ci2-linux-4-19
2023/03/06 01:33 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/05 18:22 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/05 11:22 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/04 13:21 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/04 07:27 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/04 06:13 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/04 04:37 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/04 03:01 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/03 19:02 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/03 15:40 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/03 13:51 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/03 05:47 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/03 04:45 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/02 02:33 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/01 17:18 linux-4.19.y 3f8a27f9e27b ef65e6cb .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/03/01 00:31 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/28 20:03 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/28 14:43 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/28 09:12 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/28 07:32 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/28 06:04 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/28 02:50 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/27 17:07 linux-4.19.y 3f8a27f9e27b 9189cb53 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/27 13:35 linux-4.19.y 3f8a27f9e27b 9189cb53 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/27 07:18 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/26 05:33 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/26 04:23 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/25 23:37 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/25 23:37 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/25 21:12 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/25 18:33 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/25 11:27 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/25 07:22 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/25 00:42 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/24 19:08 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/24 15:47 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/24 13:36 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/23 12:56 linux-4.19.y 3f8a27f9e27b 9e2ebb3c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/23 02:16 linux-4.19.y 3f8a27f9e27b 9f1e2cb3 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/23 02:05 linux-4.19.y 3f8a27f9e27b 9f1e2cb3 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/22 20:58 linux-4.19.y 3f8a27f9e27b 9f1e2cb3 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/22 19:05 linux-4.19.y 3f8a27f9e27b 9f1e2cb3 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/21 00:00 linux-4.19.y 3f8a27f9e27b 2414209c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/20 09:44 linux-4.19.y 3f8a27f9e27b bcdf85f8 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/18 13:49 linux-4.19.y 3f8a27f9e27b d02e9a70 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/17 19:51 linux-4.19.y 3f8a27f9e27b cf8c2d39 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/17 15:08 linux-4.19.y 3f8a27f9e27b 3e7039f4 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2023/02/16 08:45 linux-4.19.y 3f8a27f9e27b 6be0f1f5 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in find_first_zero_bit
2021/01/12 23:42 linux-4.19.y 675cc038067f 0cdd6185 .config console log report info ci2-linux-4-19
2020/09/20 23:05 linux-4.19.y 015e94d0e37b 9564d2e9 .config console log report info ci2-linux-4-19
* Struck through repros no longer work on HEAD.