================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:447 [inline] BUG: KASAN: slab-out-of-bounds in skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] BUG: KASAN: slab-out-of-bounds in skb_segment+0x14ba/0x37a0 net/core/skbuff.c:3996 Read of size 734 at addr ffff8880303abc1e by task syz-executor.4/20348 CPU: 0 PID: 20348 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 check_memory_region_inline mm/kasan/generic.c:179 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:185 memcpy+0x20/0x60 mm/kasan/shadow.c:64 memcpy include/linux/string.h:447 [inline] skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] skb_segment+0x14ba/0x37a0 net/core/skbuff.c:3996 tcp_gso_segment+0x33d/0x17e0 net/ipv4/tcp_offload.c:98 tcp4_gso_segment net/ipv4/tcp_offload.c:51 [inline] tcp4_gso_segment+0x194/0x3a0 net/ipv4/tcp_offload.c:29 inet_gso_segment+0x502/0x1110 net/ipv4/af_inet.c:1378 skb_mac_gso_segment+0x26e/0x530 net/core/dev.c:3326 __skb_gso_segment+0x330/0x6e0 net/core/dev.c:3399 skb_gso_segment include/linux/netdevice.h:4712 [inline] cake_enqueue+0x2808/0x39f0 net/sched/sch_cake.c:1742 __dev_xmit_skb net/core/dev.c:3807 [inline] __dev_queue_xmit+0x1913/0x2dd0 net/core/dev.c:4119 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0xeb6/0x21b0 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:441 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8e9/0x1a00 net/ipv4/ip_output.c:532 __tcp_transmit_skb+0x188c/0x38f0 net/ipv4/tcp_output.c:1405 tcp_transmit_skb net/ipv4/tcp_output.c:1423 [inline] tcp_write_xmit+0xde7/0x6140 net/ipv4/tcp_output.c:2689 do_tcp_sendpages+0xb92/0xdb0 net/ipv4/tcp.c:1087 tcp_sendpage_locked net/ipv4/tcp.c:1132 [inline] tcp_sendpage_locked net/ipv4/tcp.c:1124 [inline] tcp_sendpage+0x80/0xd0 net/ipv4/tcp.c:1142 inet_sendpage+0xd0/0x140 net/ipv4/af_inet.c:831 kernel_sendpage.part.0+0x1ab/0x350 net/socket.c:3636 kernel_sendpage+0x82/0xd0 net/socket.c:3633 kcm_write_msgs+0x342/0x1920 net/kcm/kcmsock.c:645 kcm_sendmsg+0x1b6f/0x20c0 net/kcm/kcmsock.c:1034 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 sock_write_iter+0x289/0x3c0 net/socket.c:999 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x791/0xa30 fs/read_write.c:605 ksys_write+0x1ee/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f48f3c3ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc39fe508f R14: 00007f48f3c3b9c0 R15: 000000000119bf8c Allocated by task 20348: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:205 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2891 [inline] __kmalloc_node_track_caller+0x1e0/0x3f0 mm/slub.c:4495 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210 alloc_skb_fclone include/linux/skbuff.h:1150 [inline] sk_stream_alloc_skb+0x109/0xc30 net/ipv4/tcp.c:888 tcp_build_frag+0x5a5/0x1250 net/ipv4/tcp.c:981 do_tcp_sendpages+0x74e/0xdb0 net/ipv4/tcp.c:1067 tcp_sendpage_locked net/ipv4/tcp.c:1132 [inline] tcp_sendpage_locked net/ipv4/tcp.c:1124 [inline] tcp_sendpage+0x80/0xd0 net/ipv4/tcp.c:1142 inet_sendpage+0xd0/0x140 net/ipv4/af_inet.c:831 kernel_sendpage.part.0+0x1ab/0x350 net/socket.c:3636 kernel_sendpage+0x82/0xd0 net/socket.c:3633 kcm_write_msgs+0x342/0x1920 net/kcm/kcmsock.c:645 kcm_sendmsg+0x1b6f/0x20c0 net/kcm/kcmsock.c:1034 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 sock_write_iter+0x289/0x3c0 net/socket.c:999 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x791/0xa30 fs/read_write.c:605 ksys_write+0x1ee/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880303ab800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 30 bytes to the right of 1024-byte region [ffff8880303ab800, ffff8880303abc00) The buggy address belongs to the page: page:00000000d0e08b57 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x303a8 head:00000000d0e08b57 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010041140 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880303abb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880303abb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880303abc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880303abc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880303abd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================