================================================================== BUG: KASAN: slab-out-of-bounds in pfkey_msg2xfrm_state net/key/af_key.c:1188 [inline] BUG: KASAN: slab-out-of-bounds in pfkey_add+0x2537/0x3220 net/key/af_key.c:1506 Read of size 8189 at addr ffff8801d1b96a18 by task syz-executor2/7788 CPU: 0 PID: 7788 Comm: syz-executor2 Not tainted 4.4.132-g1d92c59 #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 7d284090c8f25aa4 ffff8800a128f740[ 82.125407] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready ffffffff81e0dfad ffffea000746e580 ffff8801d1b96a18 0000000000000000 ffff8801d1b96c00 ffff8801d1b96a00 ffff8800a128f778 ffffffff8151527c ffff8801d1b96a18 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x6c/0x216 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408 [] check_memory_region_inline mm/kasan/kasan.c:325 [inline] [] check_memory_region+0x14f/0x1b0 mm/kasan/kasan.c:332 [] memcpy+0x23/0x50 mm/kasan/kasan.c:367 [] pfkey_msg2xfrm_state net/key/af_key.c:1188 [inline] [] pfkey_add+0x2537/0x3220 net/key/af_key.c:1506 [] pfkey_process+0x671/0x740 net/key/af_key.c:2834 [] pfkey_sendmsg+0x346/0xae0 net/key/af_key.c:3678 [] sock_sendmsg_nosec net/socket.c:625 [inline] [] sock_sendmsg+0xcc/0x110 net/socket.c:635 [] ___sys_sendmsg+0x745/0x880 net/socket.c:1962 [] __sys_sendmsg+0xd6/0x190 net/socket.c:1996 [] SYSC_sendmsg net/socket.c:2007 [inline] [] SyS_sendmsg+0x2d/0x50 net/socket.c:2003 [] entry_SYSCALL_64_fastpath+0x22/0x9e Allocated by task 7788: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616 [] kasan_krealloc+0x64/0x80 mm/kasan/kasan.c:654 [] ksize+0x8a/0xf0 mm/slub.c:3727 [] __alloc_skb+0x133/0x600 net/core/skbuff.c:237 [] alloc_skb include/linux/skbuff.h:815 [inline] [] pfkey_sendmsg+0xfe/0xae0 net/key/af_key.c:3665 [] sock_sendmsg_nosec net/socket.c:625 [inline] [] sock_sendmsg+0xcc/0x110 net/socket.c:635 [] ___sys_sendmsg+0x745/0x880 net/socket.c:1962 [] __sys_sendmsg+0xd6/0x190 net/socket.c:1996 [] SYSC_sendmsg net/socket.c:2007 [inline] [] SyS_sendmsg+0x2d/0x50 net/socket.c:2003 [] entry_SYSCALL_64_fastpath+0x22/0x9e Freed by task 2025: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589 [] slab_free_hook mm/slub.c:1383 [inline] [] slab_free_freelist_hook mm/slub.c:1405 [inline] [] slab_free mm/slub.c:2859 [inline] [] kfree+0xf4/0x310 mm/slub.c:3749 [] skb_free_head net/core/skbuff.c:571 [inline] [] skb_release_data+0x304/0x3b0 net/core/skbuff.c:602 [] skb_release_all+0x4a/0x60 net/core/skbuff.c:661 [] __kfree_skb net/core/skbuff.c:675 [inline] [] consume_skb+0xf3/0x3d0 net/core/skbuff.c:748 [] netlink_broadcast_filtered+0x2b2/0x9c0 net/netlink/af_netlink.c:1479 [] kobject_uevent_env+0x6d8/0xb80 lib/kobject_uevent.c:316 [] kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374 [] uevent_store+0x8a/0xe0 drivers/base/core.c:420 [] dev_attr_store+0x5e/0x90 drivers/base/core.c:137 [] sysfs_kf_write+0x114/0x180 fs/sysfs/file.c:141 [] kernfs_fop_write+0x2b3/0x400 fs/kernfs/file.c:312 [] __vfs_write+0x11c/0x3f0 fs/read_write.c:489 [] vfs_write+0x191/0x4e0 fs/read_write.c:538 [] SYSC_write fs/read_write.c:585 [inline] [] SyS_write+0xd9/0x1c0 fs/read_write.c:577 [] entry_SYSCALL_64_fastpath+0x22/0x9e The buggy address belongs to the object at ffff8801d1b96a00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of 512-byte region [ffff8801d1b96a00, ffff8801d1b96c00) The buggy address belongs to the page: BUG: Bad page map in process syz-executor7 pte:8000000004a28205 pmd:1d3ca7067 addr:00007ffd71284000 vm_flags:00000000 anon_vma:ffffea000746e580 mapping: (null) index:ffffffff8daf4af3 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 7805 Comm: syz-executor7 Not tainted 4.4.132-g1d92c59 #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d378e000 task.stack: ffff8800b4518000 RIP: 0010:[] [] print_bad_pte.cold.105+0x143/0x242 mm/memory.c:694 RSP: 0018:ffff8800b451f680 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 1ffff100168a3ed5 RCX: 0000000000000000 RDX: 000000000000000a RSI: ffffffff81513bea RDI: 0000000000000050 RBP: ffff8800b451f730 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff8801d1b96a00 R13: ffff8800a12189b0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f5d25970700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd62f0bfac CR3: 00000000a21fd000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8daf4af3 ffff8800a1218a00 ffff8800a1218a50 00000001d41a4067 0000000000000000 0000000041b58ab3 ffffffff841de570 ffffffff81490eb0 ffffea0006fabc60 8000000004a28205 0000000041b58ab3 ffff8800b5a72858 Call Trace: [] vm_normal_page+0x246/0x290 mm/memory.c:763 [] zap_pte_range mm/memory.c:1141 [inline] [] zap_pmd_range mm/memory.c:1262 [inline] [] zap_pud_range mm/memory.c:1283 [inline] [] unmap_page_range mm/memory.c:1307 [inline] [] unmap_single_vma+0x9fb/0x1250 mm/memory.c:1352 [] unmap_vmas+0x81/0xd0 mm/memory.c:1382 [] exit_mmap+0x1c9/0x3a0 mm/mmap.c:2926 [] __mmput kernel/fork.c:715 [inline] [] mmput+0xf8/0x2d0 kernel/fork.c:735 [] exit_mm kernel/exit.c:444 [inline] [] do_exit+0x8d8/0x26b0 kernel/exit.c:746 [] do_group_exit+0x111/0x330 kernel/exit.c:889 [] get_signal+0x4ec/0x14b0 kernel/signal.c:2317 [] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712 [] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:248 [] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline] [] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:348 [] int_ret_from_sys_call+0x25/0xa3 Code: c1 e0 2a 48 c1 ea 03 80 3c 02 00 74 05 e8 76 54 fe ff 4d 8b 7c 24 28 b8 ff ff 37 00 48 c1 e0 2a 49 8d 7f 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 74 05 e8 52 54 fe ff 4d 8b 7f 50 e8 b9 d5 e3 ff 49 RIP [] print_bad_pte.cold.105+0x143/0x242 mm/memory.c:694 RSP ---[ end trace 10e4daaba732eedb ]---