================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1746 Read of size 18446744073709551588 at addr ffff88810d68f040 by task syz.2.80/565 CPU: 1 PID: 565 Comm: syz.2.80 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 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+0x979/0x21d0 fs/ext4/xattr.c:1746 ext4_xattr_block_set+0xad3/0x3260 fs/ext4/xattr.c:1993 ext4_xattr_set_handle+0xbc4/0x12c0 fs/ext4/xattr.c:2418 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2520 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3f2/0x440 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:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xc5/0xe0 fs/xattr.c:648 x64_sys_call+0x633/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:189 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: 0033:0x7fd731b9bf79 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:00007ffd260179b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fd731e15fa0 RCX: 00007fd731b9bf79 RDX: 0000200000000140 RSI: 00002000000001c0 RDI: 0000200000000000 RBP: 00007fd731c327e0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000841 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd731e15fac R14: 00007fd731e15fa0 R15: 00007fd731e15fa0 Allocated by task 565: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958 kmemdup+0x2b/0x60 mm/util.c:134 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x9d5/0x3260 fs/ext4/xattr.c:1941 ext4_xattr_set_handle+0xbc4/0x12c0 fs/ext4/xattr.c:2418 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2520 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3f2/0x440 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:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xc5/0xe0 fs/xattr.c:648 x64_sys_call+0x633/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:189 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 The buggy address belongs to the object at ffff88810d68f000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff88810d68f000, ffff88810d68f400) The buggy address belongs to the physical page: page:ffffea000435a200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d688 head:ffffea000435a200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100043080 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 311, tgid 311 (syz-executor), ts 26243350548, free_ts 26119604104 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643 prep_new_page+0x1c/0x110 mm/page_alloc.c:2650 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554 __alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3d0 mm/slub.c:2020 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node_track_caller+0xa0/0x1e0 mm/slab_common.c:958 kmalloc_reserve net/core/skbuff.c:449 [inline] __alloc_skb+0x236/0x4b0 net/core/skbuff.c:518 alloc_skb include/linux/skbuff.h:1290 [inline] nlmsg_new include/net/netlink.h:991 [inline] rtmsg_fib+0x60a/0xe20 net/ipv4/fib_semantics.c:522 fib_table_insert+0xf53/0x1df0 net/ipv4/fib_trie.c:1385 fib_magic net/ipv4/fib_frontend.c:1118 [inline] fib_add_ifaddr+0x937/0xf10 net/ipv4/fib_frontend.c:1155 fib_netdev_event+0x231/0x5b0 net/ipv4/fib_frontend.c:1500 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1551 [inline] free_pcp_prepare mm/page_alloc.c:1625 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3589 free_unref_page+0x95/0x540 mm/page_alloc.c:3687 free_the_page mm/page_alloc.c:836 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:5957 free_pages+0x82/0x90 mm/page_alloc.c:5968 kasan_depopulate_vmalloc_pte+0x6b/0x90 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2687 [inline] apply_to_pmd_range mm/memory.c:2731 [inline] apply_to_pud_range mm/memory.c:2767 [inline] apply_to_p4d_range mm/memory.c:2803 [inline] __apply_to_page_range+0x8de/0xc80 mm/memory.c:2839 apply_to_existing_page_range+0x38/0x50 mm/memory.c:2872 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:492 __purge_vmap_area_lazy+0xf15/0x1870 mm/vmalloc.c:1791 drain_vmap_area_work+0x3e/0xd0 mm/vmalloc.c:1820 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302 worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88810d68ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810d68ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88810d68f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88810d68f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810d68f100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================