================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1783 Read of size 18446744073709551572 at addr ffff8880284b6850 by task syz.3.8019/28019 CPU: 1 UID: 0 PID: 28019 Comm: syz.3.8019 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 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:1783 ext4_xattr_block_set+0x878/0x2ad0 fs/ext4/xattr.c:2030 ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline] ext4_expand_extra_isize_ea+0x12cf/0x1ea0 fs/ext4/xattr.c:2832 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6297 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6340 [inline] __ext4_mark_inode_dirty+0x45c/0x730 fs/ext4/inode.c:6418 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6450 __mark_inode_dirty+0x3a4/0x1470 fs/fs-writeback.c:2609 mark_inode_dirty include/linux/fs.h:2212 [inline] ext4_setattr+0xaea/0x1c60 fs/ext4/inode.c:5968 notify_change+0xc1a/0xf40 fs/attr.c:556 chmod_common+0x273/0x4a0 fs/open.c:639 do_fchmodat+0x12d/0x230 fs/open.c:684 __do_sys_chmod fs/open.c:708 [inline] __se_sys_chmod fs/open.c:706 [inline] __x64_sys_chmod+0x62/0x70 fs/open.c:706 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f04fe39c799 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:00007f04ff2df028 EFLAGS: 00000246 ORIG_RAX: 000000000000005a RAX: ffffffffffffffda RBX: 00007f04fe615fa0 RCX: 00007f04fe39c799 RDX: 0000000000000000 RSI: 0000000000000122 RDI: 0000200000000380 RBP: 00007f04fe432bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f04fe616038 R14: 00007f04fe615fa0 R15: 00007fffc54d6308 Allocated by task 28019: 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:5238 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5346 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:1978 ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline] ext4_expand_extra_isize_ea+0x12cf/0x1ea0 fs/ext4/xattr.c:2832 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6297 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6340 [inline] __ext4_mark_inode_dirty+0x45c/0x730 fs/ext4/inode.c:6418 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6450 __mark_inode_dirty+0x3a4/0x1470 fs/fs-writeback.c:2609 mark_inode_dirty include/linux/fs.h:2212 [inline] ext4_setattr+0xaea/0x1c60 fs/ext4/inode.c:5968 notify_change+0xc1a/0xf40 fs/attr.c:556 chmod_common+0x273/0x4a0 fs/open.c:639 do_fchmodat+0x12d/0x230 fs/open.c:684 __do_sys_chmod fs/open.c:708 [inline] __se_sys_chmod fs/open.c:706 [inline] __x64_sys_chmod+0x62/0x70 fs/open.c:706 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880284b6800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 80 bytes inside of 1024-byte region [ffff8880284b6800, ffff8880284b6c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880284b4800 pfn:0x284b0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88813fea8dc0 ffff88813fea3888 ffffea0000d45a10 raw: ffff8880284b4800 000000080010000f 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88813fea8dc0 ffff88813fea3888 ffffea0000d45a10 head: ffff8880284b4800 000000080010000f 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000a12c01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 7041592779, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3269 [inline] allocate_slab+0x77/0x660 mm/slub.c:3458 new_slab mm/slub.c:3516 [inline] refill_objects+0x331/0x3c0 mm/slub.c:7153 refill_sheaf mm/slub.c:2818 [inline] __pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4592 alloc_from_pcs mm/slub.c:4695 [inline] slab_alloc_node mm/slub.c:4829 [inline] __kmalloc_cache_node_noprof+0x465/0x6b0 mm/slub.c:5366 kmalloc_node_noprof include/linux/slab.h:1077 [inline] alloc_desc+0x63/0x6f0 kernel/irq/irqdesc.c:440 alloc_descs kernel/irq/irqdesc.c:527 [inline] __irq_alloc_descs+0x3d0/0x840 kernel/irq/irqdesc.c:918 irq_domain_alloc_descs kernel/irq/irqdomain.c:-1 [inline] irq_domain_alloc_irqs_locked+0x8d/0xcb0 kernel/irq/irqdomain.c:1636 __irq_domain_alloc_irqs+0xa5/0x100 kernel/irq/irqdomain.c:1708 __msi_domain_alloc_irqs+0x81b/0x1450 kernel/irq/msi.c:1336 __msi_domain_alloc_locked kernel/irq/msi.c:1393 [inline] msi_domain_alloc_locked+0x4af/0xb40 kernel/irq/msi.c:1398 msi_domain_alloc_irqs_all_locked+0xab/0xf0 kernel/irq/msi.c:1474 __msix_setup_interrupts drivers/pci/msi/msi.c:679 [inline] msix_setup_interrupts drivers/pci/msi/msi.c:700 [inline] msix_capability_init+0x767/0xea0 drivers/pci/msi/msi.c:740 __pci_enable_msix_range+0x505/0x5f0 drivers/pci/msi/msi.c:850 page_owner free stack trace missing Memory state around the buggy address: ffff8880284b6700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880284b6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880284b6800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880284b6880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880284b6900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================