netlink: 20 bytes leftover after parsing attributes in process `syz.3.1027'. ubi0: attaching mtd0 ubi0: scanning is finished ================================================================== BUG: KASAN: slab-out-of-bounds in notifier_chain_register+0x3ac/0x420 kernel/notifier.c:27 Read of size 4 at addr ffff88804da198d8 by task syz.3.1027/9265 CPU: 2 UID: 0 PID: 9265 Comm: syz.3.1027 Not tainted 6.13.0-syzkaller-08291-g805ba04cb7cc #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: 0033:0x7fc41d38cda9 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:00007fc41e141038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc41d5a5fa0 RCX: 00007fc41d38cda9 RDX: 0000000020000502 RSI: 0000000040186f40 RDI: 0000000000000004 RBP: 00007fc41d40e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc41d5a5fa0 R15: 00007ffe3494eae8 Allocated by task 8136: 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 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] mr_table_alloc+0x5f/0x2e0 net/ipv4/ipmr_base.c:41 ipmr_new_table net/ipv4/ipmr.c:432 [inline] ipmr_new_table net/ipv4/ipmr.c:420 [inline] ipmr_rules_init net/ipv4/ipmr.c:266 [inline] ipmr_net_init net/ipv4/ipmr.c:3116 [inline] ipmr_net_init+0x3c4/0x4e0 net/ipv4/ipmr.c:3108 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 __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 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88804da18000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2240 bytes to the right of allocated 4120-byte region [ffff88804da18000, ffff88804da19018) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4da18 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b043180 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b043180 0000000000000000 0000000000000001 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001368601 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 7075, tgid 7074 (syz.2.392), ts 62753932343, free_ts 62743386440 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] __kmalloc_cache_noprof+0xfa/0x410 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] audit_log_d_path+0xce/0x1e0 kernel/audit.c:2149 audit_log_d_path_exe+0x46/0x70 kernel/audit.c:2219 audit_log_task+0x31e/0x3f0 kernel/auditsc.c:2959 audit_seccomp+0x7a/0x280 kernel/auditsc.c:3006 seccomp_log kernel/seccomp.c:1016 [inline] __seccomp_filter+0x670/0xf40 kernel/seccomp.c:1337 __secure_computing+0x26c/0x3f0 kernel/seccomp.c:1367 syscall_trace_enter+0x8b/0x260 kernel/entry/common.c:52 syscall_enter_from_user_mode_work include/linux/entry-common.h:169 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline] do_syscall_64+0x1ee/0x250 arch/x86/entry/common.c:79 page last free pid 7075 tgid 7074 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 audit_buffer_alloc kernel/audit.c:1791 [inline] audit_log_start+0x2bc/0x7e0 kernel/audit.c:1913 audit_seccomp+0x61/0x280 kernel/auditsc.c:3003 seccomp_log kernel/seccomp.c:1016 [inline] __seccomp_filter+0x670/0xf40 kernel/seccomp.c:1337 __secure_computing+0x26c/0x3f0 kernel/seccomp.c:1367 syscall_trace_enter+0x8b/0x260 kernel/entry/common.c:52 syscall_enter_from_user_mode_work include/linux/entry-common.h:169 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline] do_syscall_64+0x1ee/0x250 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88804da19780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804da19800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804da19880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88804da19900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804da19980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================