================================================================== BUG: KASAN: use-after-free in dev_map_enqueue+0x3c/0x340 kernel/bpf/devmap.c:529 Read of size 8 at addr ffff88805beaf680 by task syz.1.1189/7579 CPU: 0 PID: 7579 Comm: syz.1.1189 Not tainted 6.1.114-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 dev_map_enqueue+0x3c/0x340 kernel/bpf/devmap.c:529 __xdp_do_redirect_frame net/core/filter.c:4294 [inline] xdp_do_redirect_frame+0x323/0x660 net/core/filter.c:4356 xdp_test_run_batch net/bpf/test_run.c:314 [inline] bpf_test_run_xdp_live+0xbf4/0x1ea0 net/bpf/test_run.c:362 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3685 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5038 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline] __se_sys_bpf kernel/bpf/syscall.c:5122 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5122 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f572397e719 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:00007f5724823038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5723b35f80 RCX: 00007f572397e719 RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a RBP: 00007f57239f12be R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5723b35f80 R15: 00007ffdd088f618 Allocated by task 6633: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xb3/0x230 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:583 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:710 [inline] alloc_fdtable+0x154/0x280 fs/file.c:137 dup_fd+0x95c/0xca0 fs/file.c:336 copy_files+0x72/0xe0 kernel/fork.c:1635 copy_process+0x1873/0x4060 kernel/fork.c:2252 kernel_clone+0x222/0x920 kernel/fork.c:2679 __do_sys_clone kernel/fork.c:2820 [inline] __se_sys_clone kernel/fork.c:2804 [inline] __x64_sys_clone+0x231/0x280 kernel/fork.c:2804 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 7513: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 __free_fdtable fs/file.c:37 [inline] put_files_struct+0x2d9/0x350 fs/file.c:432 do_exit+0xa54/0x26a0 kernel/exit.c:866 do_group_exit+0x202/0x2b0 kernel/exit.c:1021 __do_sys_exit_group kernel/exit.c:1032 [inline] __se_sys_exit_group kernel/exit.c:1030 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2845 nf_hook_entries_free net/netfilter/core.c:88 [inline] __nf_register_net_hook+0x788/0x930 net/netfilter/core.c:445 nf_register_net_hook+0xac/0x180 net/netfilter/core.c:566 nf_register_net_hooks+0x3d/0x1a0 net/netfilter/core.c:582 ipt_register_table+0x4ca/0x7a0 net/ipv4/netfilter/ip_tables.c:1783 iptable_security_table_init+0x3e/0x60 net/ipv4/netfilter/iptable_security.c:46 xt_find_table_lock+0x2cc/0x3a0 net/netfilter/x_tables.c:1259 xt_request_find_table_lock+0x22/0xf0 net/netfilter/x_tables.c:1284 get_info net/ipv4/netfilter/ip_tables.c:965 [inline] do_ipt_get_ctl+0x872/0x1890 net/ipv4/netfilter/ip_tables.c:1661 nf_getsockopt+0x28e/0x2b0 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x21a/0x2d0 net/ipv4/ip_sockglue.c:1826 tcp_getsockopt+0x15c/0x1c0 net/ipv4/tcp.c:4450 __sys_getsockopt+0x2b2/0x5d0 net/socket.c:2332 __do_sys_getsockopt net/socket.c:2347 [inline] __se_sys_getsockopt net/socket.c:2344 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2344 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88805beaf680 which belongs to the cache kmalloc-cg-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff88805beaf680, ffff88805beaf6e0) The buggy address belongs to the physical page: page:ffffea00016fabc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5beaf memcg:ffff88802fca6001 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888017c428c0 raw: 0000000000000000 0000000000200020 00000001ffffffff ffff88802fca6001 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4244, tgid 4244 (syz-executor), ts 58179303080, free_ts 12981518368 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2517 prep_new_page mm/page_alloc.c:2524 [inline] get_page_from_freelist+0x322e/0x33b0 mm/page_alloc.c:4290 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5558 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa2/0x230 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:583 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:710 [inline] kvzalloc include/linux/slab.h:718 [inline] allocate_hook_entries_size net/netfilter/core.c:61 [inline] nf_hook_entries_grow+0x331/0x760 net/netfilter/core.c:128 __nf_register_net_hook+0x29c/0x930 net/netfilter/core.c:423 nf_register_net_hook+0xac/0x180 net/netfilter/core.c:566 nf_register_net_hooks+0x3d/0x1a0 net/netfilter/core.c:582 nf_ct_netns_do_get+0x206/0x630 net/netfilter/nf_conntrack_proto.c:500 nf_ct_netns_inet_get+0x3b/0x150 net/netfilter/nf_conntrack_proto.c:595 nf_conncount_init+0x12a/0x390 net/netfilter/nf_conncount.c:542 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1444 [inline] free_pcp_prepare mm/page_alloc.c:1494 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3369 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3464 free_contig_range+0x9a/0x150 mm/page_alloc.c:9518 destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354 do_one_initcall+0x265/0x8f0 init/main.c:1298 do_initcall_level+0x157/0x207 init/main.c:1371 do_initcalls+0x49/0x86 init/main.c:1387 kernel_init_freeable+0x45c/0x60f init/main.c:1626 kernel_init+0x19/0x290 init/main.c:1514 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88805beaf580: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff88805beaf600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88805beaf680: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88805beaf700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88805beaf780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================