netlink: 'syz.2.1479': attribute type 10 has an invalid length. batman_adv: batadv0: Removing interface: team0 team0: Cannot enslave team device to itself ================================================================== BUG: KASAN: slab-out-of-bounds in btf_name_valid_section kernel/bpf/btf.c:824 [inline] BUG: KASAN: slab-out-of-bounds in btf_datasec_check_meta+0x2c9/0x9a0 kernel/bpf/btf.c:4693 Read of size 1 at addr ffff88802f992948 by task syz.2.1479/12110 CPU: 1 UID: 0 PID: 12110 Comm: syz.2.1479 Not tainted 6.11.0-rc4-syzkaller-00326-g5277d130947b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 btf_name_valid_section kernel/bpf/btf.c:824 [inline] btf_datasec_check_meta+0x2c9/0x9a0 kernel/bpf/btf.c:4693 btf_check_meta kernel/bpf/btf.c:5175 [inline] btf_check_all_metas kernel/bpf/btf.c:5199 [inline] btf_parse_type_sec+0x4d5/0x2620 kernel/bpf/btf.c:5335 btf_parse kernel/bpf/btf.c:5763 [inline] btf_new_fd+0x43f/0xd30 kernel/bpf/btf.c:7683 __sys_bpf+0x6ef/0x810 kernel/bpf/syscall.c:5762 __do_sys_bpf kernel/bpf/syscall.c:5824 [inline] __se_sys_bpf kernel/bpf/syscall.c:5822 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5822 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe0a0b7def9 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:00007fe0a19e0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fe0a0d35f80 RCX: 00007fe0a0b7def9 RDX: 0000000000000028 RSI: 00000000200002c0 RDI: 0000000000000012 RBP: 00007fe0a0bf0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe0a0d35f80 R15: 00007ffc017756b8 Allocated by task 12110: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4164 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:650 btf_parse kernel/bpf/btf.c:5739 [inline] btf_new_fd+0x265/0xd30 kernel/bpf/btf.c:7683 __sys_bpf+0x6ef/0x810 kernel/bpf/syscall.c:5762 __do_sys_bpf kernel/bpf/syscall.c:5824 [inline] __se_sys_bpf kernel/bpf/syscall.c:5822 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5822 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802f992800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes to the right of allocated 328-byte region [ffff88802f992800, ffff88802f992948) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f990 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff88801ac41c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff88801ac41c80 0000000000000000 dead000000000001 head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000 head: 00fff00000000002 ffffea0000be6401 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 20614747348, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4184 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x429/0xaa0 net/ipv6/mcast.c:936 ipv6_add_dev+0xe12/0x1220 net/ipv6/addrconf.c:471 addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3653 call_netdevice_notifier net/core/dev.c:1688 [inline] call_netdevice_register_notifiers net/core/dev.c:1696 [inline] call_netdevice_register_net_notifiers+0x187/0x5c0 net/core/dev.c:1726 register_netdevice_notifier+0x10f/0x4a0 net/core/dev.c:1777 addrconf_init+0xe4/0x330 net/ipv6/addrconf.c:7438 inet6_init+0x3ad/0x6a0 net/ipv6/af_inet6.c:1176 do_one_initcall+0x248/0x880 init/main.c:1267 page_owner free stack trace missing Memory state around the buggy address: ffff88802f992800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802f992880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802f992900: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ^ ffff88802f992980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802f992a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================