================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xa27/0x1eb0 fs/ext4/xattr.c:1710 Read of size 18446744073709551600 at addr ffff8880704b3eb8 by task syz.1.60/4672 CPU: 1 PID: 4672 Comm: syz.1.60 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0xa27/0x1eb0 fs/ext4/xattr.c:1710 ext4_xattr_ibody_set+0x25e/0x700 fs/ext4/xattr.c:2217 ext4_destroy_inline_data_nolock+0x237/0x5f0 fs/ext4/inline.c:468 ext4_destroy_inline_data+0x7f/0xe0 fs/ext4/inline.c:1931 ext4_writepages+0x599/0x2e70 fs/ext4/inode.c:2763 do_writepages+0x3c6/0x640 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] __filemap_fdatawrite mm/filemap.c:427 [inline] filemap_flush+0xe0/0x140 mm/filemap.c:454 ext4_convert_inline_data+0x186/0x5b0 fs/ext4/inline.c:2105 ext4_setattr+0xe91/0x1bc0 fs/ext4/inode.c:5572 notify_change+0xca0/0xf90 fs/attr.c:499 do_truncate+0x1ac/0x240 fs/open.c:65 vfs_truncate+0x262/0x2f0 fs/open.c:111 do_sys_truncate+0xf2/0x1c0 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f4b5af9e0d9 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:00007f4b5be14028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f4b5b225fa0 RCX: 00007f4b5af9e0d9 RDX: 0000000000000000 RSI: 000000000000ffff RDI: 0000200000000280 RBP: 00007f4b5b035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4b5b226038 R14: 00007f4b5b225fa0 R15: 00007ffd2508cc48 The buggy address belongs to the physical page: page:ffffea0001c12cc0 refcount:2 mapcount:0 mapping:ffff888148c90800 index:0x2 pfn:0x704b3 memcg:ffff88807b0ae000 aops:def_blk_aops ino:700001 flags: 0xfff5800000205a(referenced|dirty|lru|workingset|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff5800000205a ffffea000148cd08 ffffea0000a4de48 ffff888148c90800 raw: 0000000000000002 ffff888054309000 00000002ffffffff ffff88807b0ae000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 4672, tgid 4671 (syz.1.60), ts 105720601132, free_ts 105610560301 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 folio_alloc+0x1c/0x60 mm/mempolicy.c:2292 filemap_alloc_folio+0xdb/0x480 mm/filemap.c:999 __filemap_get_folio+0x6ba/0xde0 mm/filemap.c:1993 pagecache_get_page+0x26/0x260 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:648 [inline] grow_dev_page fs/buffer.c:946 [inline] grow_buffers fs/buffer.c:1011 [inline] __getblk_slow fs/buffer.c:1038 [inline] __getblk_gfp+0x2a0/0xa80 fs/buffer.c:1333 sb_getblk include/linux/buffer_head.h:356 [inline] __ext4_get_inode_loc+0x45f/0xd60 fs/ext4/inode.c:4525 ext4_get_inode_loc fs/ext4/inode.c:4653 [inline] ext4_reserve_inode_write+0x10a/0x290 fs/ext4/inode.c:5942 __ext4_mark_inode_dirty+0x161/0x760 fs/ext4/inode.c:6119 ext4_dirty_inode+0xbf/0x100 fs/ext4/inode.c:6156 __mark_inode_dirty+0x2e7/0xe80 fs/fs-writeback.c:2500 generic_update_time fs/inode.c:1946 [inline] inode_update_time fs/inode.c:1959 [inline] __file_update_time+0x21d/0x240 fs/inode.c:2147 file_modified_flags+0x390/0x440 fs/inode.c:2220 ext4_write_checks+0x23b/0x2c0 fs/ext4/file.c:264 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3555 release_pages+0x20d1/0x2340 mm/swap.c:1035 __pagevec_release+0x6d/0xe0 mm/swap.c:1055 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x808/0x21d0 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1062 [inline] shmem_evict_inode+0x225/0x9f0 mm/shmem.c:1171 evict+0x4b6/0x8b0 fs/inode.c:705 __dentry_kill+0x412/0x630 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x597/0x8b0 fs/file_table.c:328 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 Memory state around the buggy address: ffff8880704b3d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880704b3e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880704b3e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880704b3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880704b3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================