audit: type=1400 audit(1578326945.404:36): avc: denied { map } for pid=7198 comm="syz-executor245" path="/root/syz-executor245898594" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 netlink: 20 bytes leftover after parsing attributes in process `syz-executor245'. ================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in radix_tree_load_root lib/radix-tree.c:602 [inline] BUG: KASAN: use-after-free in radix_tree_next_chunk+0x953/0x9a0 lib/radix-tree.c:1736 Read of size 8 at addr ffff8880991ee988 by task syz-executor245/7198 CPU: 1 PID: 7198 Comm: syz-executor245 Not tainted 4.14.162-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:183 [inline] radix_tree_load_root lib/radix-tree.c:602 [inline] radix_tree_next_chunk+0x953/0x9a0 lib/radix-tree.c:1736 radix_tree_iter_lookup include/linux/radix-tree.h:440 [inline] ida_remove+0xaa/0x230 lib/idr.c:377 ida_simple_remove+0x39/0x60 lib/idr.c:503 ipvlan_link_new+0x515/0xfe0 drivers/net/ipvlan/ipvlan_main.c:633 rtnl_newlink+0xecb/0x1700 net/core/rtnetlink.c:2719 rtnetlink_rcv_msg+0x3da/0xb70 net/core/rtnetlink.c:4306 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4318 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x440609 RSP: 002b:00007ffe8cec3d88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440609 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00000000006ca018 R08: 0000000000000004 R09: 00000000004002c8 R10: 0000000000006e61 R11: 0000000000000246 R12: 0000000000401e90 R13: 0000000000401f20 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7198: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] ipvlan_port_create drivers/net/ipvlan/ipvlan_main.c:140 [inline] ipvlan_link_new+0x657/0xfe0 drivers/net/ipvlan/ipvlan_main.c:562 rtnl_newlink+0xecb/0x1700 net/core/rtnetlink.c:2719 rtnetlink_rcv_msg+0x3da/0xb70 net/core/rtnetlink.c:4306 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4318 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 7198: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 ipvlan_port_destroy+0x285/0x400 drivers/net/ipvlan/ipvlan_main.c:187 ipvlan_uninit+0xc1/0xf0 drivers/net/ipvlan/ipvlan_main.c:233 register_netdevice+0x79b/0xca0 net/core/dev.c:7719 ipvlan_link_new+0x49f/0xfe0 drivers/net/ipvlan/ipvlan_main.c:611 rtnl_newlink+0xecb/0x1700 net/core/rtnetlink.c:2719 rtnetlink_rcv_msg+0x3da/0xb70 net/core/rtnetlink.c:4306 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4318 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880991ee0c0 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2248 bytes inside of 4096-byte region [ffff8880991ee0c0, ffff8880991ef0c0) The buggy address belongs to the page: page:ffffea0002647b80 count:1 mapcount:0 mapping:ffff8880991ee0c0 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff8880991ee0c0 0000000000000000 0000000100000001 raw: ffffea00020dfd20 ffffea0002092ca0 ffff8880aa800dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880991ee880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880991ee900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880991ee980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880991eea00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880991eea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================