================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xa2f/0x1e90 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff88804e9d1eb8 by task syz.2.4403/24543 CPU: 0 PID: 24543 Comm: syz.2.4403 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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+0xa2f/0x1e90 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x250/0x690 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x237/0x5e0 fs/ext4/inline.c:468 ext4_convert_inline_data_nolock+0x3c0/0x9e0 fs/ext4/inline.c:1250 ext4_convert_inline_data+0x4b9/0x5f0 fs/ext4/inline.c:2111 ext4_fallocate+0xe6/0x1f80 fs/ext4/extents.c:4812 vfs_fallocate+0x584/0x6f0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xbd/0x100 fs/open.c:352 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: 0033:0x7f2dc099c819 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:00007f2dc1867028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f2dc0c15fa0 RCX: 00007f2dc099c819 RDX: 0000000000000002 RSI: 0000000000000010 RDI: 000000000000000b RBP: 00007f2dc0a32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000007fff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2dc0c16038 R14: 00007f2dc0c15fa0 R15: 00007ffdefa0edd8 The buggy address belongs to the physical page: page:ffffea00013a7440 refcount:2 mapcount:0 mapping:ffff88801788bef8 index:0x2 pfn:0x4e9d1 memcg:ffff8880538de000 aops:def_blk_aops ino:700002 flags: 0xfff58000002052(referenced|lru|workingset|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff58000002052 ffffea0001409088 ffffea00019cad48 ffff88801788bef8 raw: 0000000000000002 ffff888050dbb2b8 00000002ffffffff ffff8880538de000 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 24543, tgid 24542 (syz.2.4403), ts 1831772451246, free_ts 1831762952332 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657 folio_alloc+0x1c/0x60 mm/mempolicy.c:2292 filemap_alloc_folio+0xdb/0x480 mm/filemap.c:999 __filemap_get_folio+0x6ab/0xdb0 mm/filemap.c:1993 pagecache_get_page+0x26/0x250 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+0x2d8/0xb20 fs/buffer.c:1333 sb_getblk include/linux/buffer_head.h:356 [inline] __ext4_get_inode_loc+0x481/0xdf0 fs/ext4/inode.c:4514 ext4_get_inode_loc+0x7e/0xf0 fs/ext4/inode.c:4642 ext4_xattr_ibody_get+0x110/0x4b0 fs/ext4/xattr.c:594 ext4_xattr_get+0x120/0x650 fs/ext4/xattr.c:655 vfs_getxattr_alloc+0x426/0x570 fs/xattr.c:380 ima_read_xattr+0x35/0x60 security/integrity/ima/ima_appraise.c:228 process_measurement+0x1025/0x1c30 security/integrity/ima/ima_main.c:333 ima_file_check+0xc8/0x110 security/integrity/ima/ima_main.c:534 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3554 release_pages+0x1fa6/0x2220 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+0x7c2/0x20c0 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1062 [inline] shmem_evict_inode+0x25b/0xa80 mm/shmem.c:1171 evict+0x4c9/0x8d0 fs/inode.c:705 __dentry_kill+0x431/0x650 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x5e0/0x920 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: ffff88804e9d1d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e9d1e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804e9d1e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88804e9d1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e9d1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================