ubi0: attaching mtd0 ubi0: scanning is finished ================================================================== BUG: KASAN: slab-use-after-free in notifier_chain_register+0x3ac/0x420 kernel/notifier.c:27 Read of size 4 at addr ffff88802b4e58d8 by task syz.3.3797/16619 CPU: 3 UID: 0 PID: 16619 Comm: syz.3.3797 Not tainted 6.13.0-syzkaller-09485-g72deda0abee6 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 notifier_chain_register+0x3ac/0x420 kernel/notifier.c:27 __blocking_notifier_chain_register kernel/notifier.c:264 [inline] blocking_notifier_chain_register+0x76/0xd0 kernel/notifier.c:282 ubi_wl_init+0x1018/0x17b0 drivers/mtd/ubi/wl.c:1960 ubi_attach+0x1b92/0x4c00 drivers/mtd/ubi/attach.c:1605 ubi_attach_mtd_dev+0x158f/0x3590 drivers/mtd/ubi/build.c:1004 ctrl_cdev_ioctl+0x339/0x3d0 drivers/mtd/ubi/cdev.c:1043 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fee8d78cda9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fee8e560038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fee8d9a5fa0 RCX: 00007fee8d78cda9 RDX: 0000000020000502 RSI: 0000000040186f40 RDI: 0000000000000003 RBP: 00007fee8e560090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fee8d9a5fa0 R15: 00007ffd1b41f6d8 Allocated by task 16326: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x21c/0x510 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] p9_fcall_init+0x97/0x260 net/9p/client.c:233 p9_tag_alloc+0x17a/0x660 net/9p/client.c:298 p9_client_prepare_req+0x19f/0x4d0 net/9p/client.c:644 p9_client_rpc+0x1c3/0xc10 net/9p/client.c:691 p9_client_xattrwalk+0xc0/0x290 net/9p/client.c:2048 v9fs_fid_xattr_get+0x108/0x300 fs/9p/xattr.c:30 v9fs_xattr_get fs/9p/xattr.c:76 [inline] v9fs_xattr_handler_get+0x6b/0x120 fs/9p/xattr.c:152 __vfs_getxattr+0x13b/0x1a0 fs/xattr.c:423 cap_inode_need_killpriv+0x40/0x60 security/commoncap.c:330 security_inode_need_killpriv+0x1b9/0x1e0 security/security.c:2638 dentry_needs_remove_privs fs/inode.c:2220 [inline] file_remove_privs_flags+0x333/0x590 fs/inode.c:2251 netfs_unbuffered_write_iter+0x1d6/0x6d0 fs/netfs/direct_write.c:162 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:404 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 16326: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x2c4/0x4d0 mm/slub.c:4757 p9_fcall_fini net/9p/client.c:255 [inline] p9_req_put net/9p/client.c:407 [inline] p9_req_put+0x20d/0x250 net/9p/client.c:402 p9_client_rpc+0x591/0xc10 net/9p/client.c:761 p9_client_xattrwalk+0xc0/0x290 net/9p/client.c:2048 v9fs_fid_xattr_get+0x108/0x300 fs/9p/xattr.c:30 v9fs_xattr_get fs/9p/xattr.c:76 [inline] v9fs_xattr_handler_get+0x6b/0x120 fs/9p/xattr.c:152 __vfs_getxattr+0x13b/0x1a0 fs/xattr.c:423 cap_inode_need_killpriv+0x40/0x60 security/commoncap.c:330 security_inode_need_killpriv+0x1b9/0x1e0 security/security.c:2638 dentry_needs_remove_privs fs/inode.c:2220 [inline] file_remove_privs_flags+0x333/0x590 fs/inode.c:2251 netfs_unbuffered_write_iter+0x1d6/0x6d0 fs/netfs/direct_write.c:162 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:404 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802b4e4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6360 bytes inside of freed 8192-byte region [ffff88802b4e4000, ffff88802b4e6000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b4e0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b043180 ffffea0000dd9c00 dead000000000003 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b043180 ffffea0000dd9c00 dead000000000003 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000ad3801 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7795, tgid 7794 (syz.3.631), ts 78187609530, free_ts 78135111160 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2587 [inline] new_slab+0x23d/0x330 mm/slub.c:2640 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_noprof+0x2ec/0x510 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] ops_init+0x77/0x5f0 net/core/net_namespace.c:128 setup_net+0x21f/0x860 net/core/net_namespace.c:362 copy_net_ns+0x2b4/0x6c0 net/core/net_namespace.c:516 create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x45d/0xa40 kernel/fork.c:3331 __do_sys_unshare kernel/fork.c:3402 [inline] __se_sys_unshare kernel/fork.c:3400 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3400 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 page last free pid 7795 tgid 7794 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660 __put_partials+0x14c/0x170 mm/slub.c:3153 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4171 __proc_create+0x2c0/0x8b0 fs/proc/generic.c:425 proc_create_reg+0x7d/0x180 fs/proc/generic.c:552 proc_create_net_data+0x8f/0x1b0 fs/proc/proc_net.c:120 if6_proc_net_init+0x53/0x70 net/ipv6/addrconf.c:4501 ops_init+0x1df/0x5f0 net/core/net_namespace.c:138 setup_net+0x21f/0x860 net/core/net_namespace.c:362 copy_net_ns+0x2b4/0x6c0 net/core/net_namespace.c:516 create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x45d/0xa40 kernel/fork.c:3331 Memory state around the buggy address: ffff88802b4e5780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b4e5800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802b4e5880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802b4e5900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b4e5980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================