================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1c28/0x3d30 fs/ext4/xattr.c:1727 Read of size 18446744073709550624 at addr ffff8880589ba7e0 by task syz.0.61/4677 CPU: 0 PID: 4677 Comm: syz.0.61 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1c28/0x3d30 fs/ext4/xattr.c:1727 ext4_xattr_block_set+0x4f7/0x2d30 fs/ext4/xattr.c:1936 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2422 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2523 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:649 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: 0033:0x7fc404df0749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc403036038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fc405047090 RCX: 00007fc404df0749 RDX: 0000200000000440 RSI: 0000200000000a00 RDI: 0000200000000100 RBP: 00007fc404e74f91 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc405047128 R14: 00007fc405047090 R15: 00007ffdc5156f48 The buggy address belongs to the page: page:ffffea0001626e80 refcount:2 mapcount:0 mapping:ffff888140892030 index:0x1c pfn:0x589ba memcg:ffff88802aaec000 aops:def_blk_aops ino:700000 flags: 0xfff0000000203a(referenced|dirty|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff0000000203a ffffea000161fa48 ffffea0001600688 ffff888140892030 raw: 000000000000001c ffff88805f07fcb0 00000002ffffffff ffff88802aaec000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 4666, ts 73577456522, free_ts 73569563060 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 __page_cache_alloc+0xd2/0x3f0 mm/filemap.c:1022 pagecache_get_page+0x986/0xef0 mm/filemap.c:1940 find_or_create_page include/linux/pagemap.h:420 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x249/0xb70 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] ext4_xattr_block_set+0x1d85/0x2d30 fs/ext4/xattr.c:2117 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2422 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2523 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x168/0x2f0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2da/0x300 fs/xattr.c:611 path_setxattr+0x142/0x280 fs/xattr.c:630 __do_sys_setxattr fs/xattr.c:646 [inline] __se_sys_setxattr fs/xattr.c:642 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page_list+0x122/0x7e0 mm/page_alloc.c:3433 release_pages+0x184b/0x1bb0 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x164/0x2e0 mm/mmu_gather.c:338 unmap_region+0x315/0x360 mm/mmap.c:2669 __do_munmap+0x9d3/0xdc0 mm/mmap.c:2899 __vm_munmap+0x137/0x230 mm/mmap.c:2952 __do_sys_munmap mm/mmap.c:2978 [inline] __se_sys_munmap mm/mmap.c:2974 [inline] __x64_sys_munmap+0x67/0x70 mm/mmap.c:2974 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: ffff8880589ba680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880589ba700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880589ba780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880589ba800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880589ba880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================