l2tp_core: tunl 3: fd 3 wrong protocol, got 1, expected 17
==================================================================
BUG: KASAN: use-after-free in l2tp_session_create+0xf94/0x10f0 net/l2tp/l2tp_core.c:1824
Read of size 4 at addr ffff8801d4fd4790 by task syzkaller191668/16513
CPU: 0 PID: 16513 Comm: syzkaller191668 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
0000000000000000 777f71efbf8b844b ffff8801d252faa8 ffffffff81d0408d
ffffea000753f500 ffff8801d4fd4790 0000000000000000 ffff8801d4fd4790
ffff8801d4fd4780 ffff8801d252fae0 ffffffff814fe143 ffff8801d4fd4790
Call Trace:
[<ffffffff81d0408d>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81d0408d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
[<ffffffff814fe143>] print_address_description+0x73/0x260 mm/kasan/report.c:252
[<ffffffff814fe655>] kasan_report_error mm/kasan/report.c:351 [inline]
[<ffffffff814fe655>] kasan_report+0x285/0x370 mm/kasan/report.c:408
[<ffffffff814fe794>] __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:428
[<ffffffff8345fe14>] l2tp_session_create+0xf94/0x10f0 net/l2tp/l2tp_core.c:1824
[<ffffffff8346354c>] pppol2tp_connect+0x10fc/0x1930 net/l2tp/l2tp_ppp.c:718
[<ffffffff82dec596>] SYSC_connect+0x1b6/0x310 net/socket.c:1557
[<ffffffff82deee04>] SyS_connect+0x24/0x30 net/socket.c:1538
[<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
Allocated by task 16513:
[<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
[<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
[<ffffffff814fd47d>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff814fd47d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
[<ffffffff814f9764>] __kmalloc+0x124/0x320 mm/slub.c:3613
[<ffffffff8345eeb9>] kmalloc include/linux/slab.h:481 [inline]
[<ffffffff8345eeb9>] kzalloc include/linux/slab.h:620 [inline]
[<ffffffff8345eeb9>] l2tp_session_create+0x39/0x10f0 net/l2tp/l2tp_core.c:1744
[<ffffffff8346354c>] pppol2tp_connect+0x10fc/0x1930 net/l2tp/l2tp_ppp.c:718
[<ffffffff82dec596>] SYSC_connect+0x1b6/0x310 net/socket.c:1557
[<ffffffff82deee04>] SyS_connect+0x24/0x30 net/socket.c:1538
[<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
Freed by task 16524:
[<ffffffff81035d96>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
[<ffffffff814fd1b3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
[<ffffffff814fdad2>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff814fdad2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
[<ffffffff814fa56c>] slab_free_hook mm/slub.c:1383 [inline]
[<ffffffff814fa56c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
[<ffffffff814fa56c>] slab_free mm/slub.c:2859 [inline]
[<ffffffff814fa56c>] kfree+0xfc/0x300 mm/slub.c:3749
[<ffffffff8345b440>] l2tp_session_free+0x170/0x200 net/l2tp/l2tp_core.c:1672
[<ffffffff8345dcf1>] l2tp_session_dec_refcount_1 net/l2tp/l2tp_core.h:293 [inline]
[<ffffffff8345dcf1>] l2tp_tunnel_closeall+0x2d1/0x3b0 net/l2tp/l2tp_core.c:1279
[<ffffffff8345e85b>] l2tp_udp_encap_destroy+0x8b/0xf0 net/l2tp/l2tp_core.c:1300
[<ffffffff8336cc51>] udpv6_destroy_sock+0xb1/0xd0 net/ipv6/udp.c:1421
[<ffffffff82dfecdb>] sk_common_release+0x6b/0x300 net/core/sock.c:2680
[<ffffffff8336bc05>] udp_lib_close+0x15/0x20 include/net/udp.h:190
[<ffffffff831cfdda>] inet_release+0xfa/0x1d0 net/ipv4/af_inet.c:435
[<ffffffff832f55a0>] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:424
[<ffffffff82de7bdd>] sock_release+0x8d/0x1e0 net/socket.c:586
[<ffffffff82de7d46>] sock_close+0x16/0x20 net/socket.c:1037
[<ffffffff81523603>] __fput+0x233/0x6d0 fs/file_table.c:208
[<ffffffff81523b25>] ____fput+0x15/0x20 fs/file_table.c:244
[<ffffffff8118b984>] task_work_run+0x104/0x180 kernel/task_work.c:115
[<ffffffff8100361d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
[<ffffffff8100361d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252
[<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
[<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:348
[<ffffffff83773ae9>] int_ret_from_sys_call+0x25/0xa3
The buggy address belongs to the object at ffff8801d4fd4780
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 16 bytes inside of
512-byte region [ffff8801d4fd4780, ffff8801d4fd4980)
The buggy address belongs to the page:
PANIC: double fault, error_code: 0x0
CPU: 1 PID: 3805 Comm: syzkaller191668 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google SeaBIOS (version 1.8.2-20171120_144221-google)
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Initializing cgroup subsys cpuacct
Initializing cgroup subsys schedtune
Linux version 4.4.120-gd63fdf6 (syzkaller@ci) (gcc version 7.1.1 20170620 (GCC) ) #28 SMP PREEMPT Tue Mar 6 13:16:06 UTC 2018
Command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0 earlyprintk=serial vsyscall=native rodata=n ftrace_dump_on_oops=orig_cpu oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 workqueue.watchdog_thresh=120
KERNEL supported cpus:
Intel GenuineIntel
AMD AuthenticAMD
Centaur CentaurHauls
x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
x86/fpu: Supporting XSAVE feature 0x01: 'x87 floating point registers'
x86/fpu: Supporting XSAVE feature 0x02: 'SSE registers'
x86/fpu: Supporting XSAVE feature 0x04: 'AVX registers'
x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
x86/fpu: Using 'eager' FPU context switches.
e820: BIOS-provided physical RAM map:
BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
BIOS-e820: [mem 0x0000000000100000-0x00000000bfff2fff] usable
BIOS-e820: [mem 0x00000000bfff3000-0x00000000bfffffff] reserved
BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] reserved
BIOS-e820: [mem 0x0000000100000000-0x000000021fffffff] usable
bootconsole [earlyser0] enabled
NX (Execute Disable) protection: active
SMBIOS 2.4 present.
Hypervisor detected: KVM
e820: last_pfn = 0x220000 max_arch_pfn = 0x400000000
x86/PAT: Configuration [0-7]: WB WC UC- UC WB WC UC- WT
e820: last_pfn = 0xbfff3 max_arch_pfn = 0x400000000
found SMP MP-table at [mem 0x000f23e0-0x000f23ef] mapped at [ffff8800000f23e0]
Scanning 1 areas for low memory corruption
Using GB pages for direct mapping
ACPI: Early table checksum verification disabled
ACPI: RSDP 0x00000000000F23A0 000014 (v00 Google)
ACPI: RSDT 0x00000000BFFF3430 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001)
ACPI: FACP 0x00000000BFFFCF60 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001)
ACPI: DSDT 0x00000000BFFF3470 0017B2 (v01 Google GOOGDSDT 00000001 GOOG 00000001)
ACPI: FACS 0x00000000BFFFCF00 000040
ACPI: FACS 0x00000000BFFFCF00 000040
ACPI: SSDT 0x00000000BFFF65F0 00690D (v01 Google GOOGSSDT 00000001 GOOG 00000001)
ACPI: APIC 0x00000000BFFF5D10 000076 (v01 Google GOOGAPIC 00000001 GOOG 00000001)
ACPI: WAET 0x00000000BFFF5CE0 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001)
ACPI: SRAT 0x00000000BFFF4C30 0000C8 (v01 Google GOOGSRAT 00000001 GOOG 00000001)
kvm-clock: Using msrs 4b564d01 and 4b564d00
kvm-clock: cpu 0, msr 2:1fffd001, primary cpu clock
kvm-clock: using sched offset of 2508049068 cycles
clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
Zone ranges:
DMA [mem 0x0000000000001000-0x0000000000ffffff]
DMA32 [mem 0x0000000001000000-0x00000000ffffffff]
Normal [mem 0x0000000100000000-0x000000021fffffff]
Movable zone start for each node
Early memory node ranges
node 0: [mem 0x0000000000001000-0x000000000009efff]
node 0: [mem 0x0000000000100000-0x00000000bfff2fff]
node 0: [mem 0x0000000100000000-0x000000021fffffff]
Initmem setup node 0 [mem 0x0000000000001000-0x000000021fffffff]
kasan: KernelAddressSanitizer initialized
ACPI: PM-Timer IO Port: 0xb008
ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
Using ACPI (MADT) for SMP configuration information
smpboot: Allowing 2 CPUs, 0 hotplug CPUs
PM: Registered nosave memory: [mem 0x00000000-0x00000fff]
PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
PM: Registered nosave memory: [mem 0x000a0000-0x000effff]
PM: Registered nosave memory: [mem 0x000f0000-0x000fffff]
PM: Registered nosave memory: [mem 0xbfff3000-0xbfffffff]
PM: Registered nosave memory: [mem 0xc0000000-0xfffbbfff]
PM: Registered nosave memory: [mem 0xfffbc000-0xffffffff]
e820: [mem 0xc0000000-0xfffbbfff] available for PCI devices
Booting paravirtualized kernel on KVM
clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:2 nr_node_ids:1
PERCPU: Embedded 42 pages/cpu @ffff8801db200000 s134024 r8192 d29816 u1048576
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 1935227
Kernel command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0 earlyprintk=serial vsyscall=native rodata=n ftrace_dump_on_oops=orig_cpu oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 workqueue.watchdog_thresh=120
PID hash table entries: 4096 (order: 3, 32768 bytes)
Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes)
Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes)
Memory: 6581404K/7863876K available (40422K kernel code, 6136K rwdata, 8808K rodata, 1848K init, 23616K bss, 1282472K reserved, 0K cma-reserved)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
Kernel/User page tables isolation: enabled
Running RCU self tests
Preemptible hierarchical RCU implementation.
RCU lockdep checking is enabled.
Build-time adjustment of leaf fanout to 64.
RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=2.
RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=2
NR_IRQS:4352 nr_irqs:440 16
console [ttyS0] enabled
console [ttyS0] enabled
bootconsole [earlyser0] disabled
bootconsole [earlyser0] disabled
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES: 8
... MAX_LOCK_DEPTH: 48
... MAX_LOCKDEP_KEYS: 8191
... CLASSHASH_SIZE: 4096
... MAX_LOCKDEP_ENTRIES: 32768
... MAX_LOCKDEP_CHAINS: 65536
... CHAINHASH_SIZE: 32768
memory used by lock dependency info: 8159 kB
per task-struct memory footprint: 1920 bytes
tsc: Detected 2300.000 MHz processor
Calibrating delay loop (skipped) preset value.. 4600.00 BogoMIPS (lpj=23000000)
pid_max: default: 32768 minimum: 301
ACPI: Core revision 20150930
ACPI: 2 ACPI AML tables successfully acquired and loaded
Security Framework initialized
SELinux: Initializing.
AppArmor: AppArmor disabled by boot time parameter
Mount-cache hash table entries: 16384 (order: 5, 131072 bytes)
Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes)
Initializing cgroup subsys io
Initializing cgroup subsys freezer
Initializing cgroup subsys hugetlb
Initializing cgroup subsys debug
CPU: Physical Processor ID: 0
mce: CPU supports 32 MCE banks
Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024
Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4
Spectre V2 : Vulnerable: Minimal generic ASM retpoline
Freeing SMP alternatives memory: 44K
..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1
smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.30GHz (family: 0x6, model: 0x3f, stepping: 0x0)
Performance Events: unsupported p6 CPU model 63 no PMU driver, software events only.
x86: Booting SMP configuration:
.... node #0, CPUs: #1
kvm-clock: cpu 1, msr 2:1fffd041, secondary cpu clock
x86: Booted up 1 node, 2 CPUs
smpboot: Total of 2 processors activated (9200.00 BogoMIPS)
devtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
futex hash table entries: 512 (order: 4, 65536 bytes)
xor: automatically using best checksumming function:
kworker/u4:0 (21) used greatest stack depth: 27944 bytes left
avx : 21690.000 MB/sec
RTC time: 19:55:59, date: 03/14/18
NET: Registered protocol family 16
schedtune: init normalization constants...
schedtune: no energy model data
schedtune: disabled!
cpuidle: using governor ladder
cpuidle: using governor menu
ACPI: bus type PCI registered
acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
PCI: Using configuration type 1 for base access
kworker/u4:1 (46) used greatest stack depth: 27448 bytes left
raid6: sse2x1 gen() 4691 MB/s
raid6: sse2x1 xor() 2641 MB/s
raid6: sse2x2 gen() 7591 MB/s
raid6: sse2x2 xor() 4327 MB/s
raid6: sse2x4 gen() 9838 MB/s
raid6: sse2x4 xor() 5665 MB/s
raid6: avx2x1 gen() 9453 MB/s
raid6: avx2x2 gen() 14446 MB/s
raid6: avx2x4 gen() 19253 MB/s
raid6: using algorithm avx2x4 gen() 19253 MB/s
raid6: using avx2x2 recovery algorithm
ACPI: Added _OSI(Module Device)
ACPI: Added _OSI(Processor Device)
ACPI: Added _OSI(3.0 _SCP Extensions)
ACPI: Added _OSI(Processor Aggregator Device)
ACPI: Executed 2 blocks of module-level executable AML code
ACPI: Interpreter enabled
ACPI: (supports S0 S3 S4 S5)
ACPI: Using IOAPIC for interrupt routing
PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI]
acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window]
pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window]
pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window]
pci_bus 0000:00: root bus resource [bus 00-ff]
pci 0000:00:01.3: quirk: [io 0xb000-0xb03f] claimed by PIIX4 ACPI
ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
ACPI: Enabled 16 GPEs in block 00 to 0F
vgaarb: loaded
SCSI subsystem initialized
ACPI: bus type USB registered
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
PTP clock support registered
ioremap error for 0xbfffd000-0xc0000000, requested 0x2, got 0x0
dmi: Firmware registration failed.
Advanced Linux Sound Architecture Driver Initialized.
PCI: Using ACPI for IRQ routing
NetLabel: Initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4
NetLabel: unlabeled traffic allowed by default
amd_nb: Cannot enumerate AMD northbridges
clocksource: Switched to clocksource kvm-clock
pnp: PnP ACPI init
pnp: PnP ACPI: found 7 devices
clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
NET: Registered protocol family 2
TCP established hash table entries: 65536 (order: 7, 524288 bytes)
TCP bind hash table entries: 65536 (order: 10, 4194304 bytes)
TCP: Hash tables configured (established 65536 bind 65536)
UDP hash table entries: 4096 (order: 7, 655360 bytes)
UDP-Lite hash table entries: 4096 (order: 7, 655360 bytes)
NET: Registered protocol family 1
pci 0000:00:00.0: Limiting direct PCI/PCI transfers
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
software IO TLB [mem 0xbbff3000-0xbfff3000] (64MB) mapped at [ffff8800bbff3000-ffff8800bfff2fff]
RAPL PMU detected, API unit is 2^-32 Joules, 3 fixed counters 10737418240 ms ovfl timer
hw unit of domain pp0-core 2^-0 Joules
hw unit of domain package 2^-0 Joules
hw unit of domain dram 2^-16 Joules
Scanning for low memory corruption every 60 seconds
audit: initializing netlink subsys (disabled)
audit: type=2000 audit(1521057364.485:1): initialized
HugeTLB registered 2 MB page size, pre-allocated 0 pages