audit: type=1400 audit(1513208945.828:7): avc: denied { map } for pid=3148 comm="syzkaller114896" path="/root/syzkaller114896418" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline] BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1173 [inline] BUG: KASAN: slab-out-of-bounds in pfkey_add+0x25a1/0x3270 net/key/af_key.c:1491 Read of size 2048 at addr ffff8801c4adf5d8 by task syzkaller114896/3148 CPU: 0 PID: 3148 Comm: syzkaller114896 Not tainted 4.15.0-rc2-mm1+ #39 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+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x137/0x190 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:344 [inline] pfkey_msg2xfrm_state net/key/af_key.c:1173 [inline] pfkey_add+0x25a1/0x3270 net/key/af_key.c:1491 pfkey_process+0x60b/0x720 net/key/af_key.c:2809 pfkey_sendmsg+0x4d6/0x9f0 net/key/af_key.c:3648 sock_sendmsg_nosec net/socket.c:636 [inline] sock_sendmsg+0xca/0x110 net/socket.c:646 ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2026 __sys_sendmsg+0xe5/0x210 net/socket.c:2060 SYSC_sendmsg net/socket.c:2071 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2067 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x43ff59 RSP: 002b:00007ffe6e10fad8 EFLAGS: 00000203 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043ff59 RDX: 0000000000000000 RSI: 00000000205f5000 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004018c0 R13: 0000000000401950 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 3148: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3676 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3690 __kmalloc_reserve.isra.41+0x41/0xd0 net/core/skbuff.c:137 __alloc_skb+0x13b/0x780 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:983 [inline] pfkey_sendmsg+0x20f/0x9f0 net/key/af_key.c:3635 sock_sendmsg_nosec net/socket.c:636 [inline] sock_sendmsg+0xca/0x110 net/socket.c:646 ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2026 __sys_sendmsg+0xe5/0x210 net/socket.c:2060 SYSC_sendmsg net/socket.c:2071 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2067 entry_SYSCALL_64_fastpath+0x1f/0x96 Freed by task 1635: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3492 [inline] kfree+0xca/0x250 mm/slab.c:3807 kernfs_fop_release+0x13f/0x180 fs/kernfs/file.c:783 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x275/0x2f0 arch/x86/entry/common.c:165 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 entry_SYSCALL_64_fastpath+0x94/0x96 The buggy address belongs to the object at ffff8801c4adf5c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of 512-byte region [ffff8801c4adf5c0, ffff8801c4adf7c0) The buggy address belongs to the page: page:000000000c6fa9a4 count:1 mapcount:0 mapping:0000000053f9abe5 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801c4adf0c0 0000000000000000 0000000100000006 raw: ffffea0007120520 ffffea000715f820 ffff8801dac00940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c4adf680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c4adf700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801c4adf780: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8801c4adf800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801c4adf880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================