================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1785 Read of size 18446744073709551572 at addr ffff8880293b0050 by task syz.3.1684/14943 CPU: 0 UID: 0 PID: 14943 Comm: syz.3.1684 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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+0x8e9/0x1e20 fs/ext4/xattr.c:1785 ext4_xattr_block_set+0x878/0x2ad0 fs/ext4/xattr.c:2032 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2459 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2561 __vfs_setxattr+0x43c/0x480 fs/xattr.c:218 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252 vfs_setxattr+0x163/0x360 fs/xattr.c:339 do_setxattr fs/xattr.c:654 [inline] filename_setxattr+0x296/0x630 fs/xattr.c:682 path_setxattrat+0x3eb/0x440 fs/xattr.c:726 __do_sys_lsetxattr fs/xattr.c:767 [inline] __se_sys_lsetxattr fs/xattr.c:763 [inline] __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:763 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1538f9ce59 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:00007f1539e1d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007f1539215fa0 RCX: 00007f1538f9ce59 RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 0000200000000100 RBP: 00007f1539032d6f R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1539216038 R14: 00007f1539215fa0 R15: 00007ffce8a2f9a8 Allocated by task 14943: 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:5295 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5407 kmemdup_noprof+0x2b/0x70 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:763 [inline] ext4_xattr_block_set+0x787/0x2ad0 fs/ext4/xattr.c:1980 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2459 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2561 __vfs_setxattr+0x43c/0x480 fs/xattr.c:218 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252 vfs_setxattr+0x163/0x360 fs/xattr.c:339 do_setxattr fs/xattr.c:654 [inline] filename_setxattr+0x296/0x630 fs/xattr.c:682 path_setxattrat+0x3eb/0x440 fs/xattr.c:726 __do_sys_lsetxattr fs/xattr.c:767 [inline] __se_sys_lsetxattr fs/xattr.c:763 [inline] __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:763 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880293b0000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 80 bytes inside of 1024-byte region [ffff8880293b0000, ffff8880293b0400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x293b0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88813fe1adc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88813fe1adc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1022, tgid 1022 (kworker/u8:7), ts 6502925924, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab+0x77/0x660 mm/slub.c:3467 new_slab mm/slub.c:3525 [inline] refill_objects+0x339/0x3d0 mm/slub.c:7271 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 alloc_from_pcs mm/slub.c:4749 [inline] slab_alloc_node mm/slub.c:4883 [inline] __do_kmalloc_node mm/slub.c:5294 [inline] __kmalloc_node_noprof+0x577/0x7c0 mm/slub.c:5301 kmalloc_node_noprof include/linux/slab.h:1081 [inline] blk_alloc_flush_queue+0xe2/0x230 block/blk-flush.c:492 blk_mq_init_hctx block/blk-mq.c:4038 [inline] blk_mq_alloc_and_init_hctx+0x79e/0xc50 block/blk-mq.c:4577 __blk_mq_realloc_hw_ctxs+0x2bd/0x670 block/blk-mq.c:4624 blk_mq_realloc_hw_ctxs block/blk-mq.c:4661 [inline] blk_mq_init_allocated_queue+0x365/0x13e0 block/blk-mq.c:4691 blk_mq_alloc_queue+0x1ba/0x2e0 block/blk-mq.c:4473 scsi_alloc_sdev+0x7c0/0xc80 drivers/scsi/scsi_scan.c:339 scsi_probe_and_add_lun+0x200/0x48e0 drivers/scsi/scsi_scan.c:1215 __scsi_scan_target+0x1f0/0xe10 drivers/scsi/scsi_scan.c:1786 scsi_scan_channel drivers/scsi/scsi_scan.c:1874 [inline] scsi_scan_host_selected+0x3d0/0x780 drivers/scsi/scsi_scan.c:1903 page_owner free stack trace missing Memory state around the buggy address: ffff8880293aff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880293aff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880293b0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880293b0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880293b0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================