KASAN: slab-out-of-bounds Read in ip6_xmit
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syzbot
Apr 11, 2019, 4:44:33 AM4/11/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: d63fdf61 Merge 4.4.120 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=174baf63800000
kernel config: https://syzkaller.appspot.com/x/.config?x=b36b3c05dfb8e06d
dashboard link: https://syzkaller.appspot.com/bug?extid=9a444eee86590da46a2a
compiler: gcc (GCC) 7.1.1 20170620
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14bbe7f3800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1235c7c3800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9a444e...@syzkaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy
available)
random: sshd: uninitialized urandom read (32 bytes read, 108 bits of
entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 112 bits of
entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 119 bits of
entropy available)
==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:141
[inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1a2c/0x1a70
net/ipv6/ip6_output.c:237
Read of size 8 at addr ffff8801cbb98658 by task syzkaller926099/3782
CPU: 1 PID: 3782 Comm: syzkaller926099 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
0000000000000000 bac76aeb48896edd ffff8800bb93f6a8 ffffffff81d0408d
ffffea00072ee600 ffff8801cbb98658 0000000000000000 ffff8801cbb98658
0000000000000040 ffff8800bb93f6e0 ffffffff814fe143 ffff8801cbb98658
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
[<ffffffff814fe7b4>] __asan_report_load8_noabort+0x14/0x20
mm/kasan/report.c:429
[<ffffffff8330649c>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
[<ffffffff8330649c>] ip6_xmit+0x1a2c/0x1a70 net/ipv6/ip6_output.c:237
[<ffffffff833c70f6>] inet6_csk_xmit+0x246/0x480
net/ipv6/inet6_connection_sock.c:176
[<ffffffff83459bef>] l2tp_xmit_core net/l2tp/l2tp_core.c:1084 [inline]
[<ffffffff83459bef>] l2tp_xmit_skb+0xc2f/0xea0 net/l2tp/l2tp_core.c:1179
[<ffffffff834666d4>] pppol2tp_sendmsg+0x584/0x7f0 net/l2tp/l2tp_ppp.c:355
[<ffffffff82deba6a>] sock_sendmsg_nosec net/socket.c:625 [inline]
[<ffffffff82deba6a>] sock_sendmsg+0xca/0x110 net/socket.c:635
[<ffffffff82ded641>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
[<ffffffff82def693>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
[<ffffffff82def77d>] SYSC_sendmsg net/socket.c:2007 [inline]
[<ffffffff82def77d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2003
[<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
Allocated by task 0:
(stack is not available)
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8801cbb98640
which belongs to the cache ip_dst_cache of size 208
The buggy address is located 24 bytes inside of
208-byte region [ffff8801cbb98640, ffff8801cbb98710)
The buggy address belongs to the page:
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: 0 PID: 0SeaBIOS (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 2143271832 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 : 21693.600 MB/sec
RTC time: 22:05:38, date: 03/06/18
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/u4:0 (45) used greatest stack depth: 27448 bytes left
raid6: sse2x1 gen() 4799 MB/s
raid6: sse2x1 xor() 2601 MB/s
raid6: sse2x2 gen() 7057 MB/s
raid6: sse2x2 xor() 4082 MB/s
raid6: sse2x4 gen() 8711 MB/s
raid6: sse2x4 xor() 5305 MB/s
raid6: avx2x1 gen() 9463 MB/s
raid6: avx2x2 gen() 14637 MB/s
raid6: avx2x4 gen() 19132 MB/s
raid6: using algorithm avx2x4 gen() 19132 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
<giom...@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
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot found the following crash on:
HEAD commit: d63fdf61 Merge 4.4.120 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=174baf63800000
kernel config: https://syzkaller.appspot.com/x/.config?x=b36b3c05dfb8e06d
dashboard link: https://syzkaller.appspot.com/bug?extid=9a444eee86590da46a2a
compiler: gcc (GCC) 7.1.1 20170620
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14bbe7f3800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1235c7c3800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9a444e...@syzkaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy
available)
random: sshd: uninitialized urandom read (32 bytes read, 108 bits of
entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 112 bits of
entropy available)
random: sshd: uninitialized urandom read (32 bytes read, 119 bits of
entropy available)
==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:141
[inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1a2c/0x1a70
net/ipv6/ip6_output.c:237
Read of size 8 at addr ffff8801cbb98658 by task syzkaller926099/3782
CPU: 1 PID: 3782 Comm: syzkaller926099 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
0000000000000000 bac76aeb48896edd ffff8800bb93f6a8 ffffffff81d0408d
ffffea00072ee600 ffff8801cbb98658 0000000000000000 ffff8801cbb98658
0000000000000040 ffff8800bb93f6e0 ffffffff814fe143 ffff8801cbb98658
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
[<ffffffff814fe7b4>] __asan_report_load8_noabort+0x14/0x20
mm/kasan/report.c:429
[<ffffffff8330649c>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
[<ffffffff8330649c>] ip6_xmit+0x1a2c/0x1a70 net/ipv6/ip6_output.c:237
[<ffffffff833c70f6>] inet6_csk_xmit+0x246/0x480
net/ipv6/inet6_connection_sock.c:176
[<ffffffff83459bef>] l2tp_xmit_core net/l2tp/l2tp_core.c:1084 [inline]
[<ffffffff83459bef>] l2tp_xmit_skb+0xc2f/0xea0 net/l2tp/l2tp_core.c:1179
[<ffffffff834666d4>] pppol2tp_sendmsg+0x584/0x7f0 net/l2tp/l2tp_ppp.c:355
[<ffffffff82deba6a>] sock_sendmsg_nosec net/socket.c:625 [inline]
[<ffffffff82deba6a>] sock_sendmsg+0xca/0x110 net/socket.c:635
[<ffffffff82ded641>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
[<ffffffff82def693>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
[<ffffffff82def77d>] SYSC_sendmsg net/socket.c:2007 [inline]
[<ffffffff82def77d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2003
[<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
Allocated by task 0:
(stack is not available)
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8801cbb98640
which belongs to the cache ip_dst_cache of size 208
The buggy address is located 24 bytes inside of
208-byte region [ffff8801cbb98640, ffff8801cbb98710)
The buggy address belongs to the page:
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: 0 PID: 0SeaBIOS (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 2143271832 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 : 21693.600 MB/sec
RTC time: 22:05:38, date: 03/06/18
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/u4:0 (45) used greatest stack depth: 27448 bytes left
raid6: sse2x1 gen() 4799 MB/s
raid6: sse2x1 xor() 2601 MB/s
raid6: sse2x2 gen() 7057 MB/s
raid6: sse2x2 xor() 4082 MB/s
raid6: sse2x4 gen() 8711 MB/s
raid6: sse2x4 xor() 5305 MB/s
raid6: avx2x1 gen() 9463 MB/s
raid6: avx2x2 gen() 14637 MB/s
raid6: avx2x4 gen() 19132 MB/s
raid6: using algorithm avx2x4 gen() 19132 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
<giom...@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
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot
Apr 11, 2019, 8:00:49 PM4/11/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 7fa8c15e UPSTREAM: socket: close race condition between so..
syzbot found the following crash on:
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=174d93bc400000
kernel config: https://syzkaller.appspot.com/x/.config?x=4440af67aeca407c
dashboard link: https://syzkaller.appspot.com/bug?extid=5e8bfcdb000c54981516
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17fe143e400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1052921e400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:141
[inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1838/0x1b80
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:141
[inline]
net/ipv6/ip6_output.c:254
Read of size 8 at addr ffff8801d57e9798 by task syz-executor153/3794
CPU: 0 PID: 3794 Comm: syz-executor153 Not tainted 4.9.123-g7fa8c15 #80
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
ffff8801bc24f540 ffffffff81eb9689 ffffea000755fa40 ffff8801d57e9798
Google 01/01/2011
0000000000000000 ffff8801d57e9798 0000000000000040 ffff8801bc24f578
ffffffff8156c3fe ffff8801d57e9798 0000000000000008 0000000000000000
Call Trace:
[<ffffffff81eb9689>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81eb9689>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff8156c3fe>] print_address_description+0x6c/0x234
mm/kasan/report.c:256
[<ffffffff8156c808>] kasan_report_error mm/kasan/report.c:355 [inline]
[<ffffffff8156c808>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
[<ffffffff8153fb94>] __asan_report_load8_noabort+0x14/0x20
mm/kasan/report.c:433
[<ffffffff835625a8>] ip6_dst_idev include/net/ip6_fib.h:141 [inline]
[<ffffffff835625a8>] ip6_xmit+0x1838/0x1b80 net/ipv6/ip6_output.c:254
[<ffffffff8362782c>] inet6_csk_xmit+0x27c/0x4d0
net/ipv6/inet6_connection_sock.c:178
[<ffffffff836c4665>] l2tp_xmit_core net/l2tp/l2tp_core.c:1178 [inline]
[<ffffffff836c4665>] l2tp_xmit_skb+0xc45/0xf30 net/l2tp/l2tp_core.c:1273
[<ffffffff836cfc30>] pppol2tp_sendmsg+0x4e0/0x790 net/l2tp/l2tp_ppp.c:339
[<ffffffff8301e0ac>] sock_sendmsg_nosec net/socket.c:648 [inline]
[<ffffffff8301e0ac>] sock_sendmsg+0xcc/0x110 net/socket.c:658
[<ffffffff8301f8ca>] ___sys_sendmsg+0x47a/0x840 net/socket.c:1982
[<ffffffff83021e31>] __sys_sendmmsg+0x161/0x3d0 net/socket.c:2072
[<ffffffff830220d5>] SYSC_sendmmsg net/socket.c:2103 [inline]
[<ffffffff830220d5>] SyS_sendmmsg+0x35/0x60 net/socket.c:2098
[<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
[<ffffffff83a01d93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Allocated by task 0:
(stack is not available)
Freed by task 0:
(stack is not available)
which belongs to the cache ip_dst_cache of size 216
The buggy address is located 24 bytes inside of
216-byte region [ffff8801d57e9780, ffff8801d57e9858)
The buggy address belongs to the page:
page:ffffea000755fa40 count:1 mapcount:0 mapping: (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801d57e9680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8801d57e9700: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801d57e9780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8801d57e9800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801d57e9880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
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