================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff8881834b6eb8 by task syz.1.292/1484 CPU: 1 PID: 1484 Comm: syz.1.292 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 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+0x13ba/0x3940 fs/ext4/xattr.c:1736 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2238 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:633 [inline] ext4_try_to_write_inline_data+0x6ef/0x1190 fs/ext4/inline.c:774 ext4_write_begin+0x243/0x12e0 fs/ext4/inode.c:1192 ext4_da_write_begin+0x321/0xbf0 fs/ext4/inode.c:2988 generic_perform_write+0x2b7/0x690 mm/filemap.c:3870 ext4_buffered_write_iter+0x4ed/0x670 fs/ext4/file.c:270 ext4_file_write_iter+0x440/0x1540 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x835/0xfd0 fs/read_write.c:594 ksys_write+0x149/0x250 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f3bcedd4819 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:00007f3bcd80e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f3bcf04e090 RCX: 00007f3bcedd4819 RDX: 0000000000001006 RSI: 0000200000001680 RDI: 0000000000000004 RBP: 00007f3bcee6ac91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3bcf04e128 R14: 00007f3bcf04e090 R15: 00007ffd3cd8f468 The buggy address belongs to the page: page:ffffea00060d2d80 refcount:7 mapcount:1 mapping:ffff888109289d18 index:0x10 pfn:0x1834b6 memcg:ffff88810df72280 aops:def_blk_aops ino:700001 flags: 0x4000000000022014(uptodate|lru|private|mappedtodisk|zone=1) raw: 4000000000022014 ffffea00060d2dc8 ffffea00060d2d48 ffff888109289d18 raw: 0000000000000010 ffff888129a51b28 0000000700000000 ffff88810df72280 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 1482, ts 77997547802, free_ts 77839319560 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] page_cache_ra_unbounded+0x2d5/0x9a0 mm/readahead.c:227 do_page_cache_ra+0xf2/0x110 mm/readahead.c:280 do_sync_mmap_readahead+0x699/0x960 mm/filemap.c:3018 filemap_fault+0xb32/0x1770 mm/filemap.c:3161 __do_fault+0x264/0x2f0 mm/memory.c:4192 do_read_fault mm/memory.c:4556 [inline] do_fault mm/memory.c:4697 [inline] handle_pte_fault+0x187d/0x2710 mm/memory.c:4911 __handle_mm_fault mm/memory.c:-1 [inline] do_handle_mm_fault+0x1af9/0x1de0 mm/memory.c:5333 handle_mm_fault include/linux/mm.h:1847 [inline] faultin_page mm/gup.c:976 [inline] __get_user_pages+0x80e/0x10c0 mm/gup.c:1197 populate_vma_page_range mm/gup.c:1529 [inline] __mm_populate+0x324/0x470 mm/gup.c:1638 mm_populate include/linux/mm.h:2704 [inline] vm_mmap_pgoff+0x262/0x430 mm/util.c:560 ksys_mmap_pgoff+0x161/0x1d0 mm/mmap.c:1647 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [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 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xae/0x540 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5898 __vunmap+0x86d/0xa00 mm/vmalloc.c:2660 __vfree mm/vmalloc.c:2709 [inline] vfree+0x8b/0xc0 mm/vmalloc.c:2740 kvfree+0x26/0x40 mm/util.c:659 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:345 queue_stack_map_free+0x15/0x20 kernel/bpf/queue_stack_maps.c:96 map_create+0x1266/0x21b0 kernel/bpf/syscall.c:938 __sys_bpf+0x2ff/0x7d0 kernel/bpf/syscall.c:4615 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff8881834b6d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881834b6e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881834b6e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881834b6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881834b6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================