================================================================== BUG: KASAN: slab-out-of-bounds in __build_skb_around+0x235/0x340 net/core/skbuff.c:294 Write of size 32 at addr ffff88807dce8ac0 by task syz-executor.1/9010 CPU: 0 PID: 9010 Comm: syz-executor.1 Not tainted 6.1.0-rc8-next-20221207-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x45d mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 memset+0x24/0x50 mm/kasan/shadow.c:44 __build_skb_around+0x235/0x340 net/core/skbuff.c:294 __build_skb+0x4f/0x60 net/core/skbuff.c:328 build_skb+0x22/0x280 net/core/skbuff.c:340 bpf_prog_test_run_skb+0x343/0x1e10 net/bpf/test_run.c:1131 bpf_prog_test_run kernel/bpf/syscall.c:3644 [inline] __sys_bpf+0x1599/0x4ff0 kernel/bpf/syscall.c:4997 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline] __se_sys_bpf kernel/bpf/syscall.c:5081 [inline] __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fafa7c8c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fafa892d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fafa7dabf80 RCX: 00007fafa7c8c0d9 RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a RBP: 00007fafa7ce7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc8ddce7cf R14: 00007fafa892d300 R15: 0000000000022000 Allocated by task 9010: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:968 [inline] __kmalloc+0x5a/0xd0 mm/slab_common.c:981 kmalloc include/linux/slab.h:584 [inline] kzalloc include/linux/slab.h:720 [inline] bpf_test_init.isra.0+0xa5/0x150 net/bpf/test_run.c:778 bpf_prog_test_run_skb+0x22e/0x1e10 net/bpf/test_run.c:1097 bpf_prog_test_run kernel/bpf/syscall.c:3644 [inline] __sys_bpf+0x1599/0x4ff0 kernel/bpf/syscall.c:4997 __do_sys_bpf kernel/bpf/syscall.c:5083 [inline] __se_sys_bpf kernel/bpf/syscall.c:5081 [inline] __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807dce8800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 704 bytes inside of 1024-byte region [ffff88807dce8800, ffff88807dce8c00) The buggy address belongs to the physical page: page:ffffea0001f73a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7dce8 head:ffffea0001f73a00 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012441dc0 ffffea00009dec00 dead000000000002 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 0, tgid 0 (swapper/1), ts 114116902638, free_ts 114095255189 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:438 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:511 alloc_skb include/linux/skbuff.h:1269 [inline] __tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3957 __tcp_send_ack net/ipv4/tcp_output.c:3989 [inline] tcp_send_ack+0x81/0xa0 net/ipv4/tcp_output.c:3989 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5536 tcp_ack_snd_check net/ipv4/tcp_input.c:5582 [inline] tcp_rcv_established+0x992/0x2230 net/ipv4/tcp_input.c:6020 tcp_v4_do_rcv+0x670/0x9b0 net/ipv4/tcp_ipv4.c:1721 tcp_v4_rcv+0x2eab/0x3280 net/ipv4/tcp_ipv4.c:2142 ip_protocol_deliver_rcu+0x9f/0x460 net/ipv4/ip_input.c:205 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3464 skb_free_frag include/linux/skbuff.h:3192 [inline] skb_free_head+0x96/0x110 net/core/skbuff.c:766 skb_release_data+0x5f4/0x870 net/core/skbuff.c:797 skb_release_all net/core/skbuff.c:862 [inline] __kfree_skb net/core/skbuff.c:876 [inline] skb_attempt_defer_free+0x309/0x3e0 net/core/skbuff.c:6651 tcp_eat_recv_skb net/ipv4/tcp.c:1638 [inline] tcp_recvmsg_locked+0x124e/0x22b0 net/ipv4/tcp.c:2633 tcp_recvmsg+0x117/0x620 net/ipv4/tcp.c:2679 inet_recvmsg+0x114/0x5e0 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_recvmsg net/socket.c:1009 [inline] sock_read_iter+0x348/0x480 net/socket.c:1086 call_read_iter include/linux/fs.h:2180 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x87b/0x9e0 fs/read_write.c:470 ksys_read+0x1ec/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807dce8980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807dce8a00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88807dce8a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807dce8b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807dce8b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================