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 ffff8880578c98d8 by task syz.1.324/7103 CPU: 2 UID: 0 PID: 7103 Comm: syz.1.324 Not tainted 6.13.0-syzkaller-08265-g9c5968db9e62 #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: 0033:0x7f7ca198cd29 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:00007f7ca274d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7ca1ba5fa0 RCX: 00007f7ca198cd29 RDX: 0000000020000502 RSI: 0000000040186f40 RDI: 0000000000000005 RBP: 00007f7ca1a0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7ca1ba5fa0 R15: 00007ffd3098fd88 Allocated by task 7044: 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_node_noprof+0x21f/0x510 mm/slub.c:4300 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:662 seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x82a/0x12b0 fs/seq_file.c:210 kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x886/0xbf0 fs/read_write.c:565 ksys_read+0x12b/0x250 fs/read_write.c:708 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 7044: 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 kvfree+0x47/0x50 mm/util.c:705 seq_release+0x4b/0x80 fs/seq_file.c:355 kernfs_fop_release+0xf4/0x1e0 fs/kernfs/file.c:766 __fput+0x3ff/0xb70 fs/file_table.c:450 __fput_sync+0xa1/0xc0 fs/file_table.c:536 __do_sys_close fs/open.c:1579 [inline] __se_sys_close fs/open.c:1564 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1564 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 ffff8880578c8000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 2264 bytes to the right of allocated 4096-byte region [ffff8880578c8000, ffff8880578c9000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x578c8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88801eebd681 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b050280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000000f5000000 ffff88801eebd681 head: 00fff00000000040 ffff88801b050280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000040004 00000000f5000000 ffff88801eebd681 head: 00fff00000000003 ffffea00015e3201 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 7044, tgid 7044 (udevd), ts 69521634838, free_ts 69509580582 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_node_noprof+0x2f0/0x510 mm/slub.c:4300 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:662 seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x82a/0x12b0 fs/seq_file.c:210 kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x886/0xbf0 fs/read_write.c:565 ksys_read+0x12b/0x250 fs/read_write.c:708 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 page last free pid 5350 tgid 5350 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 ptlock_alloc+0x1f/0x70 mm/memory.c:7044 ptlock_init include/linux/mm.h:2972 [inline] pagetable_pte_ctor include/linux/mm.h:3020 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0x74/0x390 arch/x86/mm/pgtable.c:44 __pte_alloc+0x6e/0x3d0 mm/memory.c:447 copy_pte_range mm/memory.c:1107 [inline] copy_pmd_range mm/memory.c:1262 [inline] copy_pud_range mm/memory.c:1299 [inline] copy_p4d_range mm/memory.c:1323 [inline] copy_page_range+0x3737/0x5690 mm/memory.c:1421 dup_mmap kernel/fork.c:748 [inline] dup_mm kernel/fork.c:1689 [inline] copy_mm kernel/fork.c:1741 [inline] copy_process+0x7df0/0x8d60 kernel/fork.c:2392 kernel_clone+0xfd/0x960 kernel/fork.c:2804 __do_sys_clone+0xba/0x100 kernel/fork.c:2947 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 Memory state around the buggy address: ffff8880578c9780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880578c9800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880578c9880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880578c9900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880578c9980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================