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* [syzbot] KASAN: invalid-free in bdev_free_inode (2)
@ 2021-08-06 11:45 syzbot
  2021-08-11 11:16 ` syzbot
  2021-08-21  2:29 ` syzbot
  0 siblings, 2 replies; 3+ messages in thread
From: syzbot @ 2021-08-06 11:45 UTC (permalink / raw)
  To: axboe, linux-block, linux-fsdevel, linux-kernel, syzkaller-bugs, viro

Hello,

syzbot found the following issue on:

HEAD commit:    c500bee1c5b2 Linux 5.14-rc4
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1415477a300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=343fd21f6f4da2d6
dashboard link: https://syzkaller.appspot.com/bug?extid=5fa698422954b6b9307b
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5fa698422954b6b9307b@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3210 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xe4/0x530 mm/slub.c:4264

CPU: 1 PID: 813 Comm: syz-executor.2 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:358
 ____kasan_slab_free mm/kasan/common.c:346 [inline]
 __kasan_slab_free+0x120/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1625 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650
 slab_free mm/slub.c:3210 [inline]
 kfree+0xe4/0x530 mm/slub.c:4264
 bdev_free_inode+0xe0/0x110 fs/block_dev.c:816
 i_callback+0x3f/0x70 fs/inode.c:222
 rcu_do_batch kernel/rcu/tree.c:2550 [inline]
 rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2785
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode+0x2c/0x40 kernel/kcov.c:174
Code: 05 a9 5c 8c 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 34 15 00 00 85 d2 74 0b 8b 86 10 15 00 00 <39> f8 0f 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0
RSP: 0018:ffffc9000941f590 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000009 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88801b691c40 RDI: 0000000000000003
RBP: ffff888036020580 R08: 0000000000000000 R09: 0000000000000009
R10: ffffffff839f2957 R11: 0000000000000010 R12: 0000000000000010
R13: 00000000000003af R14: dffffc0000000000 R15: 0000000000000000
 write_comp_data kernel/kcov.c:218 [inline]
 __sanitizer_cov_trace_const_cmp4+0x1c/0x70 kernel/kcov.c:284
 tomoyo_domain_quota_is_ok+0x307/0x550 security/tomoyo/util.c:1093
 tomoyo_supervisor+0x2f2/0xf00 security/tomoyo/common.c:2089
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573
 tomoyo_check_open_permission+0x33e/0x380 security/tomoyo/file.c:777
 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline]
 tomoyo_file_open+0xa3/0xd0 security/tomoyo/tomoyo.c:306
 security_file_open+0x52/0x4f0 security/security.c:1633
 do_dentry_open+0x353/0x11d0 fs/open.c:813
 do_open fs/namei.c:3374 [inline]
 path_openat+0x1c23/0x27f0 fs/namei.c:3507
 do_filp_open+0x1aa/0x400 fs/namei.c:3534
 do_sys_openat2+0x16d/0x420 fs/open.c:1204
 do_sys_open fs/open.c:1220 [inline]
 __do_sys_openat fs/open.c:1236 [inline]
 __se_sys_openat fs/open.c:1231 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1231
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4196d4
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44
RSP: 002b:00007f69595e9060 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004196d4
RDX: 0000000000000002 RSI: 00007f69595e90f0 RDI: 00000000ffffff9c
RBP: 00007f69595e90f0 R08: 0000000000000000 R09: 00007f69595e8f70
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000a9fb1f R14: 00007f69595e9300 R15: 0000000000022000

Allocated by task 802:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522
 kmalloc_node include/linux/slab.h:609 [inline]
 kzalloc_node include/linux/slab.h:732 [inline]
 __alloc_disk_node+0x4e/0x380 block/genhd.c:1246
 __blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145
 loop_add+0x324/0x8c0 drivers/block/loop.c:2345
 loop_control_ioctl+0x130/0x450 drivers/block/loop.c:2492
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 802:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1625 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650
 slab_free mm/slub.c:3210 [inline]
 kfree+0xe4/0x530 mm/slub.c:4264
 __alloc_disk_node+0x2e8/0x380 block/genhd.c:1271
 __blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145
 loop_add+0x324/0x8c0 drivers/block/loop.c:2345
 loop_control_ioctl+0x130/0x450 drivers/block/loop.c:2492
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3029 [inline]
 call_rcu+0xb1/0x750 kernel/rcu/tree.c:3109
 put_ctx kernel/events/core.c:1273 [inline]
 put_ctx+0x116/0x1e0 kernel/events/core.c:1266
 perf_event_exit_task_context kernel/events/core.c:12664 [inline]
 perf_event_exit_task+0x528/0x740 kernel/events/core.c:12693
 do_exit+0xbe4/0x2a60 kernel/exit.c:834
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2160 kernel/signal.c:2808
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348
 insert_work+0x48/0x370 kernel/workqueue.c:1332
 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1419
 expire_timers kernel/time/timer.c:1459 [inline]
 __run_timers.part.0+0x49f/0xa50 kernel/time/timer.c:1732
 __run_timers kernel/time/timer.c:1713 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1745
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

The buggy address belongs to the object at ffff88802ac59400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88802ac59400, ffff88802ac59600)
The buggy address belongs to the page:
page:ffffea0000ab1600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ac58
head:ffffea0000ab1600 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010841c80
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 18483051698, free_ts 0
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
 alloc_slab_page mm/slub.c:1688 [inline]
 allocate_slab+0x32e/0x4b0 mm/slub.c:1828
 new_slab mm/slub.c:1891 [inline]
 new_slab_objects mm/slub.c:2637 [inline]
 ___slab_alloc+0x4ba/0x820 mm/slub.c:2800
 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2840
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc_trace+0x30f/0x3c0 mm/slub.c:2981
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 devcgroup_css_alloc+0x3d/0x120 security/device_cgroup.c:214
 css_create kernel/cgroup/cgroup.c:5229 [inline]
 cgroup_apply_control_enable+0x4b8/0xc00 kernel/cgroup/cgroup.c:3085
 cgroup_mkdir+0x5ac/0x10f0 kernel/cgroup/cgroup.c:5447
 kernfs_iop_mkdir+0x146/0x1d0 fs/kernfs/dir.c:1127
 vfs_mkdir+0x52e/0x760 fs/namei.c:3823
 do_mkdirat+0x284/0x310 fs/namei.c:3848
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802ac59300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802ac59380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802ac59400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88802ac59480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802ac59500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [syzbot] KASAN: invalid-free in bdev_free_inode (2)
  2021-08-06 11:45 [syzbot] KASAN: invalid-free in bdev_free_inode (2) syzbot
@ 2021-08-11 11:16 ` syzbot
  2021-08-21  2:29 ` syzbot
  1 sibling, 0 replies; 3+ messages in thread
From: syzbot @ 2021-08-11 11:16 UTC (permalink / raw)
  To: axboe, linux-block, linux-fsdevel, linux-kernel, netdev,
	syzkaller-bugs, viro

syzbot has found a reproducer for the following issue on:

HEAD commit:    d3432bf10f17 net: Support filtering interfaces on no master
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14fd894e300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8075b2614f3db143
dashboard link: https://syzkaller.appspot.com/bug?extid=5fa698422954b6b9307b
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=174ebaf6300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5fa698422954b6b9307b@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3210 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xe4/0x530 mm/slub.c:4264

CPU: 1 PID: 11043 Comm: syz-executor.1 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:358
 ____kasan_slab_free mm/kasan/common.c:346 [inline]
 __kasan_slab_free+0x120/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1625 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650
 slab_free mm/slub.c:3210 [inline]
 kfree+0xe4/0x530 mm/slub.c:4264
 bdev_free_inode+0xe0/0x110 fs/block_dev.c:816
 i_callback+0x3f/0x70 fs/inode.c:222
 rcu_do_batch kernel/rcu/tree.c:2550 [inline]
 rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2785
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197
Code: 01 f0 4d 89 03 e9 63 fd ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 <65> 8b 05 f9 41 8c 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc9000dccf1d8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801c27d4c0 RSI: ffffffff815d5923 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fceb8a7
R10: ffffffff815d5919 R11: 0000000000000000 R12: ffffffff84c5a900
R13: 0000000000000200 R14: dffffc0000000000 R15: ffffc9000dccf238
 console_unlock+0x7c9/0xc40 kernel/printk/printk.c:2653
 vprintk_emit+0x1ca/0x560 kernel/printk/printk.c:2174
 vprintk+0x8d/0x260 kernel/printk/printk_safe.c:392
 printk+0xba/0xed kernel/printk/printk.c:2216
 nbd_genl_connect.cold+0x157/0x16f drivers/block/nbd.c:1852
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69709a7188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000020000540 RDI: 0000000000000006
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffca6ecd5bf R14: 00007f69709a7300 R15: 0000000000022000

Allocated by task 11042:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522
 kmalloc_node include/linux/slab.h:609 [inline]
 kzalloc_node include/linux/slab.h:732 [inline]
 __alloc_disk_node+0x4e/0x380 block/genhd.c:1246
 __blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145
 nbd_dev_add+0x2a9/0x940 drivers/block/nbd.c:1703
 nbd_genl_connect+0x551/0x1820 drivers/block/nbd.c:1842
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 11042:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1625 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650
 slab_free mm/slub.c:3210 [inline]
 kfree+0xe4/0x530 mm/slub.c:4264
 __alloc_disk_node+0x2e8/0x380 block/genhd.c:1271
 __blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145
 nbd_dev_add+0x2a9/0x940 drivers/block/nbd.c:1703
 nbd_genl_connect+0x551/0x1820 drivers/block/nbd.c:1842
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888016977000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff888016977000, ffff888016977200)
The buggy address belongs to the page:
page:ffffea00005a5d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16974
head:ffffea00005a5d00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001164f00 0000000500000005 ffff888010841c80
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 824, ts 2603409140, free_ts 0
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
 alloc_slab_page mm/slub.c:1688 [inline]
 allocate_slab+0x32e/0x4b0 mm/slub.c:1828
 new_slab mm/slub.c:1891 [inline]
 new_slab_objects mm/slub.c:2637 [inline]
 ___slab_alloc+0x473/0x7b0 mm/slub.c:2800
 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2840
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc_trace+0x30f/0x3c0 mm/slub.c:2981
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 alloc_bprm+0x51/0x8f0 fs/exec.c:1501
 kernel_execve+0x55/0x460 fs/exec.c:1941
 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888016976f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888016976f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888016977000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888016977080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888016977100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [syzbot] KASAN: invalid-free in bdev_free_inode (2)
  2021-08-06 11:45 [syzbot] KASAN: invalid-free in bdev_free_inode (2) syzbot
  2021-08-11 11:16 ` syzbot
@ 2021-08-21  2:29 ` syzbot
  1 sibling, 0 replies; 3+ messages in thread
From: syzbot @ 2021-08-21  2:29 UTC (permalink / raw)
  To: axboe, balbi, corbet, gregkh, linux-block, linux-doc,
	linux-fsdevel, linux-kernel, linux-usb, lorenzo, manish.narani,
	maze, netdev, phind.uet, syzkaller-bugs, viro

syzbot has bisected this issue to:

commit 63d152149b2d0860ccf8c4e6596b6175b2b7ace6
Author: Lorenzo Colitti <lorenzo@google.com>
Date:   Wed Jan 13 23:42:22 2021 +0000

    usb: gadget: u_ether: support configuring interface names.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=155abcc1300000
start commit:   d3432bf10f17 net: Support filtering interfaces on no master
git tree:       net-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=175abcc1300000
console output: https://syzkaller.appspot.com/x/log.txt?x=135abcc1300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8075b2614f3db143
dashboard link: https://syzkaller.appspot.com/bug?extid=5fa698422954b6b9307b
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=174ebaf6300000

Reported-by: syzbot+5fa698422954b6b9307b@syzkaller.appspotmail.com
Fixes: 63d152149b2d ("usb: gadget: u_ether: support configuring interface names.")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2021-08-21  2:29 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-06 11:45 [syzbot] KASAN: invalid-free in bdev_free_inode (2) syzbot
2021-08-11 11:16 ` syzbot
2021-08-21  2:29 ` syzbot

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