================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1741 Read of size 18446744073709551588 at addr ffff88811467c040 by task syz.1.3426/13048 CPU: 0 PID: 13048 Comm: syz.1.3426 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x71/0x210 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:427 kasan_report+0x122/0x150 mm/kasan/report.c:531 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1741 ext4_xattr_block_set+0xada/0x3270 fs/ext4/xattr.c:1988 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2515 ext4_xattr_security_set+0x3c/0x50 fs/ext4/xattr_security.c:31 __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+0x168/0x2f0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x2b2/0x2d0 fs/xattr.c:617 path_setxattr+0x142/0x280 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:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2bd558ebe9 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:00007f2bd6481038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007f2bd57b6090 RCX: 00007f2bd558ebe9 RDX: 00002000000013c0 RSI: 0000200000000140 RDI: 0000200000000100 RBP: 00007f2bd5611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2bd57b6128 R14: 00007f2bd57b6090 R15: 00007ffcb3e1acb8 Allocated by task 13048: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:388 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+0x9dc/0x3270 fs/ext4/xattr.c:1936 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2515 ext4_xattr_security_set+0x3c/0x50 fs/ext4/xattr_security.c:31 __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+0x168/0x2f0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x2b2/0x2d0 fs/xattr.c:617 path_setxattr+0x142/0x280 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:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88811467c000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff88811467c000, ffff88811467c400) The buggy address belongs to the physical page: page:ffffea0004519e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114678 head:ffffea0004519e00 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 3297, tgid 3297 (udevd), ts 954742643511, free_ts 954731760017 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637 prep_new_page+0x1c/0x110 mm/page_alloc.c:2644 get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4544 __alloc_pages+0x1c3/0x450 mm/page_alloc.c:5858 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1962 [inline] new_slab+0x98/0x3d0 mm/slub.c:2015 ___slab_alloc+0x6f6/0xb50 mm/slub.c:3203 __slab_alloc+0x5e/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3462 __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] netlink_alloc_large_skb net/netlink/af_netlink.c:1184 [inline] netlink_sendmsg+0x626/0xbc0 net/netlink/af_netlink.c:1835 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x5a9/0x990 net/socket.c:2509 ___sys_sendmsg+0x21c/0x290 net/socket.c:2563 __sys_sendmsg net/socket.c:2592 [inline] __do_sys_sendmsg net/socket.c:2601 [inline] __se_sys_sendmsg net/socket.c:2599 [inline] __x64_sys_sendmsg+0x1f0/0x2c0 net/socket.c:2599 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1545 [inline] free_pcp_prepare mm/page_alloc.c:1619 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3581 free_unref_page+0x8f/0x530 mm/page_alloc.c:3677 free_the_page mm/page_alloc.c:830 [inline] free_compound_page+0x99/0xd0 mm/page_alloc.c:853 destroy_large_folio+0x68/0xa0 mm/page_alloc.c:890 __folio_put_large mm/swap.c:110 [inline] __folio_put+0xd1/0xe0 mm/swap.c:118 folio_put include/linux/mm.h:1431 [inline] put_page include/linux/mm.h:1483 [inline] __skb_frag_unref include/linux/skbuff.h:3455 [inline] skb_release_data+0x47f/0x890 net/core/skbuff.c:788 skb_release_all net/core/skbuff.c:859 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:873 tcp_wmem_free_skb include/net/tcp.h:308 [inline] tcp_rtx_queue_unlink_and_free+0x400/0x640 include/net/tcp.h:1979 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3415 [inline] tcp_ack+0x1e6f/0x5cd0 net/ipv4/tcp_input.c:3974 tcp_rcv_established+0x72d/0x1a20 net/ipv4/tcp_input.c:6106 tcp_v4_do_rcv+0x446/0xa10 net/ipv4/tcp_ipv4.c:1683 tcp_v4_rcv+0x233c/0x2a80 net/ipv4/tcp_ipv4.c:2114 ip_protocol_deliver_rcu+0x325/0x6e0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x24e/0x410 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x1d8/0x320 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:463 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0x773/0x880 net/ipv4/ip_input.c:639 Memory state around the buggy address: ffff88811467bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811467bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811467c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811467c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811467c100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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