SS: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 ES: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 FS: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 ================================================================== GS: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 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+0x5d4/0x830 crypto/dh_helper.c:61 Write of size 268 at addr ffff8801b192b7d4 by task syz-executor4/18099 GDTR: limit=0x000007ff, base=0x0000000000001000 CPU: 0 PID: 18099 Comm: syz-executor4 Not tainted 4.18.0-rc7-next-20180803+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 LDTR: sel=0x0008, attr=0x04082, limit=0x000007ff, base=0x0000000000001800 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 IDTR: limit=0x000001ff, base=0x0000000000003800 TR: sel=0x00d0, attr=0x0008b, limit=0x000001ff, base=0x0000000000004e00 print_address_description+0x6c/0x20b mm/kasan/report.c:256 EFER = 0x0000000000000001 PAT = 0x0007040600070406 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 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 Interruptibility = 00000000 ActivityState = 00000000 memcpy include/linux/string.h:345 [inline] dh_pack_data crypto/dh_helper.c:21 [inline] crypto_dh_encode_key+0x5d4/0x830 crypto/dh_helper.c:61 *** Host State *** RIP = 0xffffffff811f4814 RSP = 0xffff8801b2f4f350 __keyctl_dh_compute+0x707/0x1c00 security/keys/dh.c:316 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 FSBase=00007fc1b1c53700 GSBase=ffff8801db100000 TRBase=fffffe0000034000 GDTBase=fffffe0000032000 IDTBase=fffffe0000000000 CR0=0000000080050033 CR3=00000001b28e1000 CR4=00000000001426e0 Sysenter RSP=fffffe0000033200 CS:RIP=0010:ffffffff86c01380 EFER = 0x0000000000000d01 PAT = 0x0000000000000000 *** Control State *** PinBased=0000003f CPUBased=b5986dfa SecondaryExec=000000ca keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 EntryControls=0000d1ff ExitControls=0023efff ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 __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 VMExit: intr_info=00000000 errcode=00000000 ilen=00000002 reason=80000021 qualification=0000000000000000 IDTVectoring: info=00000000 errcode=00000000 TSC Offset = 0xffffff7ce302e2be entry_SYSCALL_64_after_hwframe+0x49/0xbe EPT pointer = 0x00000001ae4ea01e RIP: 0033:0x456cb9 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 hfs: can't find a HFS filesystem on dev loop7 RSP: 002b:00007fbcb4706c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007fbcb47076d4 RCX: 0000000000456cb9 RDX: 0000000020002f00 RSI: 00000000200001c0 RDI: 0000000000000017 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 *** Guest State *** R10: 0000000000000084 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d1920 R14: 00000000004c72f5 R15: 0000000000000000 Allocated by task 18099: 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 CR0: actual=0x0000000080000039, shadow=0x00000000e0000019, gh_mask=fffffffffffffff7 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 CR4: actual=0x0000000000002050, shadow=0x0000000000000010, gh_mask=ffffffffffffe871 entry_SYSCALL_64_after_hwframe+0x49/0xbe CR3 = 0x0000000000004000 Freed by task 16971: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 RSP = 0x0000000000000f80 RIP = 0x0000000000009102 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 RFLAGS=0x00020002 DR7 = 0x0000000000000400 kvm_destroy_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:589 [inline] kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:732 [inline] kvm_put_kvm+0x31c/0x1060 arch/x86/kvm/../../../virt/kvm/kvm_main.c:772 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2402 Sysenter RSP=0000000000000f80 CS:RIP=0030:0000000000002810 __fput+0x376/0x8a0 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 CS: sel=0x0010, attr=0x0009b, limit=0x000fffff, base=0x0000000000000000 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 DS: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe SS: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 The buggy address belongs to the object at ffff8801b192b7c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 20 bytes inside of 512-byte region [ffff8801b192b7c0, ffff8801b192b9c0) The buggy address belongs to the page: ES: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 page:ffffea0006c64ac0 count:1 mapcount:0 mapping:ffff8801dac00940 index:0xffff8801b192b540 FS: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006d96c48 ffffea0006d968c8 ffff8801dac00940 GS: sel=0x0018, attr=0x00093, limit=0x000fffff, base=0x0000000000000000 raw: ffff8801b192b540 ffff8801b192b040 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected GDTR: limit=0x000007ff, base=0x0000000000001000 Memory state around the buggy address: ffff8801b192b780: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff8801b192b800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 LDTR: sel=0x0008, attr=0x04082, limit=0x000007ff, base=0x0000000000001800 >ffff8801b192b880: 00 00 00 00 00 00 00 00 00 00 00 06 fc fc fc fc ^ ffff8801b192b900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc IDTR: limit=0x000001ff, base=0x0000000000003800 ffff8801b192b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================