================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1326/0x3860 fs/ext4/xattr.c:1729 Read of size 18446744073709551600 at addr ffff88811d3312b8 by task syz.2.64/578 CPU: 0 PID: 578 Comm: syz.2.64 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1326/0x3860 fs/ext4/xattr.c:1729 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2229 ext4_destroy_inline_data_nolock+0x20f/0x5e0 fs/ext4/inline.c:464 ext4_convert_inline_data_to_extent fs/ext4/inline.c:629 [inline] ext4_try_to_write_inline_data+0x6d0/0x11f0 fs/ext4/inline.c:769 ext4_write_begin+0x246/0x1690 fs/ext4/inode.c:1192 ext4_da_write_begin+0x478/0xf10 fs/ext4/inode.c:3033 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x758/0xdc0 fs/read_write.c:605 ksys_pwrite64 fs/read_write.c:712 [inline] __do_sys_pwrite64 fs/read_write.c:722 [inline] __se_sys_pwrite64 fs/read_write.c:719 [inline] __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:719 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fc906ed1799 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:00007fc90592c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fc90714afa0 RCX: 00007fc906ed1799 RDX: 0000000000000002 RSI: 0000200000000800 RDI: 0000000000000007 RBP: 00007fc906f67c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008080c61 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc90714b038 R14: 00007fc90714afa0 R15: 00007fffc9f6aff8 The buggy address belongs to the page: page:ffffea000474cc40 refcount:3 mapcount:1 mapping:ffff88810933b9d0 index:0x2 pfn:0x11d331 aops:def_blk_aops ino:0 flags: 0x400000000032201e(referenced|uptodate|dirty|lru|private|mappedtodisk|unevictable|mlocked) raw: 400000000032201e ffffea000498aac8 ffffea0004d41ac8 ffff88810933b9d0 raw: 0000000000000002 ffff88811b434738 0000000300000000 ffff8881285f0000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8881285f0000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 642, ts 39253917275, free_ts 39252741372 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] __page_cache_alloc include/linux/pagemap.h:290 [inline] page_cache_ra_unbounded+0x2dc/0x7e0 mm/readahead.c:226 do_page_cache_ra+0xf2/0x110 mm/readahead.c:277 do_sync_mmap_readahead mm/filemap.c:2668 [inline] filemap_fault+0x1211/0x20d0 mm/filemap.c:2811 __do_fault mm/memory.c:4064 [inline] do_read_fault mm/memory.c:4399 [inline] do_fault mm/memory.c:4527 [inline] handle_pte_fault+0x1fa5/0x3750 mm/memory.c:4791 __handle_mm_fault mm/memory.c:4944 [inline] handle_mm_fault+0xf81/0x1710 mm/memory.c:5358 faultin_page mm/gup.c:902 [inline] __get_user_pages+0xbf8/0x1400 mm/gup.c:1121 populate_vma_page_range mm/gup.c:1454 [inline] __mm_populate+0x34f/0x440 mm/gup.c:1502 mm_populate include/linux/mm.h:2793 [inline] vm_mmap_pgoff+0x254/0x370 mm/util.c:548 ksys_mmap_pgoff+0x16f/0x1e0 mm/mmap.c:1712 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page mm/page_alloc.c:5443 [inline] __free_pages+0x146/0x3b0 mm/page_alloc.c:5454 free_pages+0x82/0x90 mm/page_alloc.c:5465 _pgd_free arch/x86/mm/pgtable.c:420 [inline] pgd_free+0x187/0x1a0 arch/x86/mm/pgtable.c:476 mm_free_pgd kernel/fork.c:675 [inline] __mmdrop+0xad/0x490 kernel/fork.c:726 mmdrop include/linux/sched/mm.h:49 [inline] __mmput+0x2df/0x2f0 kernel/fork.c:1164 mmput+0x4e/0x150 kernel/fork.c:1176 exit_mm kernel/exit.c:539 [inline] do_exit+0x9ec/0x2500 kernel/exit.c:859 do_group_exit+0x141/0x310 kernel/exit.c:986 get_signal+0xf7d/0x12e0 kernel/signal.c:2793 arch_do_signal_or_restart+0xe2/0x11d0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:291 Memory state around the buggy address: ffff88811d331180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811d331200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811d331280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811d331300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811d331380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop2): ext4_read_block_bitmap_nowait:485: Cannot get buffer for block bitmap - block_group = 0, block_bitmap = 48142 EXT4-fs warning (device loop2): ext4_read_block_bitmap_nowait:485: Cannot get buffer for block bitmap - block_group = 0, block_bitmap = 48142