================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1e04/0x3940 fs/ext4/xattr.c:1715 Read of size 18446744073709550624 at addr ffff8881169bf7e0 by task syz.3.215/1182 CPU: 1 PID: 1182 Comm: syz.3.215 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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+0x1e04/0x3940 fs/ext4/xattr.c:1715 ext4_xattr_block_set+0x4f8/0x2d10 fs/ext4/xattr.c:1924 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2407 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2508 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x36c/0x390 fs/xattr.c:611 path_setxattr+0x147/0x290 fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:649 x64_sys_call+0x8cc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190 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: 0033:0x7f0971f9a799 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:00007f09709d4028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007f0972214090 RCX: 00007f0971f9a799 RDX: 0000200000000440 RSI: 00002000000000c0 RDI: 0000200000000100 RBP: 00007f0972030bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0972214128 R14: 00007f0972214090 R15: 00007fff7e358778 The buggy address belongs to the page: page:ffffea00045a6fc0 refcount:2 mapcount:0 mapping:ffff888109288d98 index:0x1c pfn:0x1169bf memcg:ffff88810d7a9140 aops:def_blk_aops ino:700003 flags: 0x400000000000203a(referenced|dirty|lru|active|private|zone=1) raw: 400000000000203a ffffea000479fc48 ffffea0004d73c48 ffff888109288d98 raw: 000000000000001c ffff8881296095e8 00000002ffffffff ffff88810d7a9140 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 1135, ts 56742367782, free_ts 56507297723 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:5808 __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] pagecache_get_page+0xac6/0xde0 mm/filemap.c:1955 find_or_create_page include/linux/pagemap.h:418 [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+0x238/0x7d0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] ext4_xattr_block_set+0x1d7c/0x2d10 fs/ext4/xattr.c:2105 ext4_xattr_set_handle+0xbc4/0x12b0 fs/ext4/xattr.c:2407 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2508 ext4_xattr_user_set+0xc4/0xf0 fs/ext4/xattr_user.c:41 __vfs_setxattr+0x3e1/0x430 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x36c/0x390 fs/xattr.c:611 path_setxattr+0x147/0x290 fs/xattr.c:630 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 __put_single_page mm/swap.c:98 [inline] __put_page+0xad/0xe0 mm/swap.c:129 put_page include/linux/mm.h:1306 [inline] __try_to_reclaim_swap+0x262/0x2b0 mm/swapfile.c:150 free_swap_and_cache+0x254/0x5a0 mm/swapfile.c:1787 zap_pte_range mm/memory.c:1504 [inline] zap_pmd_range mm/memory.c:1575 [inline] zap_pud_range mm/memory.c:1604 [inline] zap_p4d_range mm/memory.c:1625 [inline] unmap_page_range+0x13b2/0x1d80 mm/memory.c:1646 unmap_single_vma mm/memory.c:1691 [inline] unmap_vmas+0x26d/0x380 mm/memory.c:1723 exit_mmap+0x412/0x8b0 mm/mmap.c:3245 __mmput+0x93/0x320 kernel/fork.c:1180 mmput+0x50/0x150 kernel/fork.c:1203 exit_mm kernel/exit.c:554 [inline] do_exit+0x9f2/0x27e0 kernel/exit.c:876 do_group_exit+0x141/0x310 kernel/exit.c:1003 __do_sys_exit_group kernel/exit.c:1014 [inline] __se_sys_exit_group kernel/exit.c:1012 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1012 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 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: ffff8881169bf680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881169bf700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881169bf780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881169bf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881169bf880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================