================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: slab-out-of-bounds in dh_pack_data crypto/dh_helper.c:21 [inline] BUG: KASAN: slab-out-of-bounds in crypto_dh_encode_key+0x609/0x830 crypto/dh_helper.c:62 Write of size 440 at addr ffff8801d979e2d5 by task syz-executor6/9886 CPU: 1 PID: 9886 Comm: syz-executor6 Not tainted 4.18.0-rc7-next-20180803+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x37/0x50 mm/kasan/kasan.c:303 memcpy include/linux/string.h:345 [inline] dh_pack_data crypto/dh_helper.c:21 [inline] crypto_dh_encode_key+0x609/0x830 crypto/dh_helper.c:62 __keyctl_dh_compute+0x707/0x1c00 security/keys/dh.c:316 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456b29 Code: fd 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f17c5a75c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007f17c5a766d4 RCX: 0000000000456b29 RDX: 00000000200002c0 RSI: 0000000020000400 RDI: 0000000000000017 RBP: 00000000009300a0 R08: 0000000020000100 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d16a0 R14: 00000000004c7069 R15: 0000000000000000 Allocated by task 9886: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] __keyctl_dh_compute+0x6e1/0x1c00 security/keys/dh.c:311 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2289: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x6a4/0x880 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb+0x193/0x560 net/core/skbuff.c:701 skb_free_datagram+0x1a/0xf0 net/core/datagram.c:329 netlink_recvmsg+0x70f/0x1490 net/netlink/af_netlink.c:1987 sock_recvmsg_nosec net/socket.c:795 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:802 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2277 __sys_recvmsg+0x11a/0x290 net/socket.c:2326 __do_sys_recvmsg net/socket.c:2336 [inline] __se_sys_recvmsg net/socket.c:2333 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2333 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d979e2c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 21 bytes inside of 512-byte region [ffff8801d979e2c0, ffff8801d979e4c0) The buggy address belongs to the page: page:ffffea000765e780 count:1 mapcount:0 mapping:ffff8801dac00940 index:0xffff8801d979e040 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00072f7ec8 ffffea0006b70348 ffff8801dac00940 raw: ffff8801d979e040 ffff8801d979e040 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d979e380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801d979e400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801d979e480: 00 02 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801d979e500: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff8801d979e580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================