================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1763 Read of size 18446744073709551540 at addr ffff88805106b870 by task syz.0.0/5324 CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1763 ext4_xattr_block_set+0x71e/0x2a80 fs/ext4/xattr.c:2032 ext4_xattr_set_handle+0xe77/0x1540 fs/ext4/xattr.c:2450 ext4_xattr_set+0x257/0x340 fs/ext4/xattr.c:2561 __vfs_setxattr+0x442/0x480 fs/xattr.c:223 __vfs_setxattr_noperm+0x12a/0x660 fs/xattr.c:257 vfs_setxattr+0x163/0x360 fs/xattr.c:344 do_setxattr fs/xattr.c:662 [inline] filename_setxattr+0x296/0x630 fs/xattr.c:690 path_setxattrat+0x408/0x450 fs/xattr.c:734 __do_sys_lsetxattr fs/xattr.c:775 [inline] __se_sys_lsetxattr fs/xattr.c:771 [inline] __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:771 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f53c0f9e019 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f53bd3f4fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007f53c1226180 RCX: 00007f53c0f9e019 RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 0000200000000100 RBP: 00007f53c103500c R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f53c1226218 R14: 00007f53c1226180 R15: 00007fff141fb548 Allocated by task 5324: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_node_track_caller_noprof+0x4c3/0x730 mm/slub.c:5471 kmemdup_noprof+0x2b/0x70 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:715 [inline] ext4_xattr_block_set+0x633/0x2a80 fs/ext4/xattr.c:1980 ext4_xattr_set_handle+0xe77/0x1540 fs/ext4/xattr.c:2450 ext4_xattr_set+0x257/0x340 fs/ext4/xattr.c:2561 __vfs_setxattr+0x442/0x480 fs/xattr.c:223 __vfs_setxattr_noperm+0x12a/0x660 fs/xattr.c:257 vfs_setxattr+0x163/0x360 fs/xattr.c:344 do_setxattr fs/xattr.c:662 [inline] filename_setxattr+0x296/0x630 fs/xattr.c:690 path_setxattrat+0x408/0x450 fs/xattr.c:734 __do_sys_lsetxattr fs/xattr.c:775 [inline] __se_sys_lsetxattr fs/xattr.c:771 [inline] __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:771 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805106b800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 112 bytes inside of 1024-byte region [ffff88805106b800, ffff88805106bc00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x51068 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 head: 04fff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 head: 04fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1112, tgid 1112 (kworker/u4:8), ts 77152155320, free_ts 77077064102 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3380 new_slab mm/slub.c:3426 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __do_kmalloc_node mm/slub.c:5333 [inline] __kmalloc_noprof+0x485/0x720 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] neigh_alloc net/core/neighbour.c:518 [inline] ___neigh_create+0x6d2/0x22b0 net/core/neighbour.c:652 ip6_finish_output2+0x6d6/0x13c0 net/ipv6/ip6_output.c:128 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x292/0x770 net/ipv6/ip6_output.c:219 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x337/0x540 net/ipv6/ip6_output.c:246 dst_output include/net/dst.h:471 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xcb2/0x1650 net/ipv6/ndisc.c:512 addrconf_dad_completed+0x911/0xe60 net/ipv6/addrconf.c:4395 addrconf_dad_work+0xcf8/0x15c0 net/ipv6/addrconf.c:-1 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 page last free pid 12 tgid 12 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950 stack_depot_save_flags+0x407/0x800 lib/stackdepot.c:735 kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4584 [inline] slab_alloc_node mm/slub.c:4917 [inline] kmem_cache_alloc_noprof+0x2a0/0x5f0 mm/slub.c:4931 ext4_init_io_end+0x29/0x130 fs/ext4/page-io.c:310 ext4_do_writepages+0xc06/0x47a0 fs/ext4/inode.c:2890 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3043 do_writepages+0x338/0x560 mm/page-writeback.c:2571 __writeback_single_inode+0x12e/0xf90 fs/fs-writeback.c:1787 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2079 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2155 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2266 wb_check_start_all fs/fs-writeback.c:2392 [inline] wb_do_writeback fs/fs-writeback.c:2439 [inline] wb_workfn+0x980/0x10f0 fs/fs-writeback.c:2477 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 Memory state around the buggy address: ffff88805106b700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805106b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805106b800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88805106b880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805106b900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================