KASAN: use-after-free Read in tcp_write_xmit
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syzbot
Apr 11, 2019, 4:44:37 AM4/11/19
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: fb7e3196 Merge 4.4.136 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=1319eddf800000
kernel config: https://syzkaller.appspot.com/x/.config?x=bb8048f8039a2281
dashboard link: https://syzkaller.appspot.com/bug?extid=8546dfd54680da72f952
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=174effef800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14db474f800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8546df...@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
==================================================================
BUG: KASAN: use-after-free in tcp_skb_pcount include/net/tcp.h:796 [inline]
BUG: KASAN: use-after-free in tcp_init_tso_segs net/ipv4/tcp_output.c:1619
[inline]
BUG: KASAN: use-after-free in tcp_write_xmit+0x3fc2/0x4cb0
net/ipv4/tcp_output.c:2056
Read of size 2 at addr ffff8801d6fc87b0 by task syz-executor408/4195
CPU: 0 PID: 4195 Comm: syz-executor408 Not tainted 4.4.136-gfb7e319 #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
0000000000000000 7d8f38ecc03be946 ffff8801d73b7710 ffffffff81e0edad
ffffea00075bf200 ffff8801d6fc87b0 0000000000000000 ffff8801d6fc87b0
dffffc0000000000 ffff8801d73b7748 ffffffff815159b6 ffff8801d6fc87b0
Call Trace:
[<ffffffff81e0edad>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81e0edad>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
[<ffffffff815159b6>] print_address_description+0x6c/0x216
mm/kasan/report.c:252
[<ffffffff81515cd5>] kasan_report_error mm/kasan/report.c:351 [inline]
[<ffffffff81515cd5>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
[<ffffffff814f9784>] __asan_report_load2_noabort+0x14/0x20
mm/kasan/report.c:427
[<ffffffff83286582>] tcp_skb_pcount include/net/tcp.h:796 [inline]
[<ffffffff83286582>] tcp_init_tso_segs net/ipv4/tcp_output.c:1619 [inline]
[<ffffffff83286582>] tcp_write_xmit+0x3fc2/0x4cb0
net/ipv4/tcp_output.c:2056
[<ffffffff83287a40>] __tcp_push_pending_frames+0xa0/0x290
net/ipv4/tcp_output.c:2307
[<ffffffff8328e966>] tcp_send_fin+0x176/0xab0 net/ipv4/tcp_output.c:2883
[<ffffffff8324c0d0>] tcp_close+0xca0/0xf70 net/ipv4/tcp.c:2112
[<ffffffff832f8d0f>] inet_release+0xff/0x1d0 net/ipv4/af_inet.c:435
[<ffffffff82f1a156>] sock_release+0x96/0x1c0 net/socket.c:586
[<ffffffff82f1a296>] sock_close+0x16/0x20 net/socket.c:1037
[<ffffffff81522da5>] __fput+0x235/0x6f0 fs/file_table.c:208
[<ffffffff815232e5>] ____fput+0x15/0x20 fs/file_table.c:244
[<ffffffff8118bd7f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
[<ffffffff81135285>] exit_task_work include/linux/task_work.h:21 [inline]
[<ffffffff81135285>] do_exit+0x9e5/0x26b0 kernel/exit.c:759
[<ffffffff8113b1d1>] do_group_exit+0x111/0x330 kernel/exit.c:889
[<ffffffff8115e5cc>] get_signal+0x4ec/0x14b0 kernel/signal.c:2321
[<ffffffff8100e02b>] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712
[<ffffffff8100360a>] exit_to_usermode_loop+0x11a/0x160
arch/x86/entry/common.c:248
[<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:283
[inline]
[<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0
arch/x86/entry/common.c:348
[<ffffffff838c29b5>] int_ret_from_sys_call+0x25/0xa3
Allocated by task 4194:
[<ffffffff810341d6>] save_stack_trace+0x26/0x50
arch/x86/kernel/stacktrace.c:63
[<ffffffff814f8873>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
[<ffffffff814f8b57>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff814f8b57>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
[<ffffffff814f9122>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
[<ffffffff814f4c1e>] slab_post_alloc_hook mm/slub.c:1349 [inline]
[<ffffffff814f4c1e>] slab_alloc_node mm/slub.c:2615 [inline]
[<ffffffff814f4c1e>] slab_alloc mm/slub.c:2623 [inline]
[<ffffffff814f4c1e>] kmem_cache_alloc+0xbe/0x2a0 mm/slub.c:2628
[<ffffffff82f380a6>] kmem_cache_alloc_node include/linux/slab.h:350
[inline]
[<ffffffff82f380a6>] __alloc_skb+0xe6/0x600 net/core/skbuff.c:218
[<ffffffff832466c3>] alloc_skb_fclone include/linux/skbuff.h:856 [inline]
[<ffffffff832466c3>] sk_stream_alloc_skb+0xa3/0x5d0 net/ipv4/tcp.c:833
[<ffffffff83249164>] tcp_sendmsg+0xd34/0x2b00 net/ipv4/tcp.c:1178
[<ffffffff83300ef3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
[<ffffffff82f1e1fc>] sock_sendmsg_nosec net/socket.c:625 [inline]
[<ffffffff82f1e1fc>] sock_sendmsg+0xcc/0x110 net/socket.c:635
[<ffffffff82f1eedc>] SYSC_sendto+0x21c/0x370 net/socket.c:1665
[<ffffffff82f21560>] SyS_sendto+0x40/0x50 net/socket.c:1633
[<ffffffff838c2825>] entry_SYSCALL_64_fastpath+0x22/0x9e
Freed by task 4194:
[<ffffffff810341d6>] save_stack_trace+0x26/0x50
arch/x86/kernel/stacktrace.c:63
[<ffffffff814f8873>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
[<ffffffff814f91a2>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff814f91a2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
[<ffffffff814f632e>] slab_free_hook mm/slub.c:1383 [inline]
[<ffffffff814f632e>] slab_free_freelist_hook mm/slub.c:1405 [inline]
[<ffffffff814f632e>] slab_free mm/slub.c:2859 [inline]
[<ffffffff814f632e>] kmem_cache_free+0xbe/0x340 mm/slub.c:2881
[<ffffffff82f3527f>] kfree_skbmem+0xcf/0x100 net/core/skbuff.c:635
[<ffffffff82f372fd>] __kfree_skb+0x1d/0x20 net/core/skbuff.c:676
[<ffffffff83288834>] sk_wmem_free_skb include/net/sock.h:1447 [inline]
[<ffffffff83288834>] tcp_write_queue_purge include/net/tcp.h:1460 [inline]
[<ffffffff83288834>] tcp_connect_init net/ipv4/tcp_output.c:3122 [inline]
[<ffffffff83288834>] tcp_connect+0xb24/0x30c0 net/ipv4/tcp_output.c:3261
[<ffffffff8329b991>] tcp_v4_connect+0xf31/0x1890 net/ipv4/tcp_ipv4.c:246
[<ffffffff832f9ca9>] __inet_stream_connect+0x2a9/0xc30
net/ipv4/af_inet.c:615
[<ffffffff832fa685>] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:676
[<ffffffff82f1eb78>] SYSC_connect+0x1b8/0x300 net/socket.c:1557
[<ffffffff82f214b4>] SyS_connect+0x24/0x30 net/socket.c:1538
[<ffffffff838c2825>] entry_SYSCALL_64_fastpath+0x22/0x9e
The buggy address belongs to the object at ffff8801d6fc8780
which belongs to the cache skbuff_fclone_cache of size 456
The buggy address is located 48 bytes inside of
456-byte region [ffff8801d6fc8780, ffff8801d6fc8948)
The buggy address belongs to the page:
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Initializing cgroup subsys cpuacct
Initializing cgroup subsys schedtune
Linux version 4.4.136-gfb7e319 (syzkaller@ci) (gcc version 8.0.1 20180413
(experimental) (GCC) ) #59 SMP PREEMPT Wed Jun 6 22:04:58 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 nopti
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
Kernel/User page tables isolation: disabled
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 0x000f22b0-0x000f22bf] mapped at
[ffff8800000f22b0]
Scanning 1 areas for low memory corruption
Using GB pages for direct mapping
ACPI: Early table checksum verification disabled
ACPI: RSDP 0x00000000000F2270 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 2315888728 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 nopti
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: 6579092K/7863876K available (41761K kernel code, 6302K rwdata,
9052K rodata, 1864K init, 23696K bss, 1284784K reserved, 0K cma-reserved)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
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 : Mitigation: Full generic retpoline
Freeing SMP alternatives memory: 48K
..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: 27920 bytes left
avx : 21737.600 MB/sec
RTC time: 17:28:06, date: 06/07/18
NET: Registered protocol family 16
schedtune: init normalization constants...
schedtune: no energy model data
schedtune: disabled!
kworker/u4:0 (29) used greatest stack depth: 27616 bytes left
kworker/u4:0 (27) used greatest stack depth: 27024 bytes left
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
raid6: sse2x1 gen() 4814 MB/s
raid6: sse2x1 xor() 2398 MB/s
raid6: sse2x2 gen() 7604 MB/s
raid6: sse2x2 xor() 4230 MB/s
raid6: sse2x4 gen() 9895 MB/s
raid6: sse2x4 xor() 5772 MB/s
raid6: avx2x1 gen() 9486 MB/s
raid6: avx2x2 gen() 14719 MB/s
raid6: avx2x4 gen() 19339 MB/s
raid6: using algorithm avx2x4 gen() 19339 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
---
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: fb7e3196 Merge 4.4.136 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=1319eddf800000
kernel config: https://syzkaller.appspot.com/x/.config?x=bb8048f8039a2281
dashboard link: https://syzkaller.appspot.com/bug?extid=8546dfd54680da72f952
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=174effef800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14db474f800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8546df...@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
==================================================================
BUG: KASAN: use-after-free in tcp_skb_pcount include/net/tcp.h:796 [inline]
BUG: KASAN: use-after-free in tcp_init_tso_segs net/ipv4/tcp_output.c:1619
[inline]
BUG: KASAN: use-after-free in tcp_write_xmit+0x3fc2/0x4cb0
net/ipv4/tcp_output.c:2056
Read of size 2 at addr ffff8801d6fc87b0 by task syz-executor408/4195
CPU: 0 PID: 4195 Comm: syz-executor408 Not tainted 4.4.136-gfb7e319 #59
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
0000000000000000 7d8f38ecc03be946 ffff8801d73b7710 ffffffff81e0edad
ffffea00075bf200 ffff8801d6fc87b0 0000000000000000 ffff8801d6fc87b0
dffffc0000000000 ffff8801d73b7748 ffffffff815159b6 ffff8801d6fc87b0
Call Trace:
[<ffffffff81e0edad>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81e0edad>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
[<ffffffff815159b6>] print_address_description+0x6c/0x216
mm/kasan/report.c:252
[<ffffffff81515cd5>] kasan_report_error mm/kasan/report.c:351 [inline]
[<ffffffff81515cd5>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
[<ffffffff814f9784>] __asan_report_load2_noabort+0x14/0x20
mm/kasan/report.c:427
[<ffffffff83286582>] tcp_skb_pcount include/net/tcp.h:796 [inline]
[<ffffffff83286582>] tcp_init_tso_segs net/ipv4/tcp_output.c:1619 [inline]
[<ffffffff83286582>] tcp_write_xmit+0x3fc2/0x4cb0
net/ipv4/tcp_output.c:2056
[<ffffffff83287a40>] __tcp_push_pending_frames+0xa0/0x290
net/ipv4/tcp_output.c:2307
[<ffffffff8328e966>] tcp_send_fin+0x176/0xab0 net/ipv4/tcp_output.c:2883
[<ffffffff8324c0d0>] tcp_close+0xca0/0xf70 net/ipv4/tcp.c:2112
[<ffffffff832f8d0f>] inet_release+0xff/0x1d0 net/ipv4/af_inet.c:435
[<ffffffff82f1a156>] sock_release+0x96/0x1c0 net/socket.c:586
[<ffffffff82f1a296>] sock_close+0x16/0x20 net/socket.c:1037
[<ffffffff81522da5>] __fput+0x235/0x6f0 fs/file_table.c:208
[<ffffffff815232e5>] ____fput+0x15/0x20 fs/file_table.c:244
[<ffffffff8118bd7f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
[<ffffffff81135285>] exit_task_work include/linux/task_work.h:21 [inline]
[<ffffffff81135285>] do_exit+0x9e5/0x26b0 kernel/exit.c:759
[<ffffffff8113b1d1>] do_group_exit+0x111/0x330 kernel/exit.c:889
[<ffffffff8115e5cc>] get_signal+0x4ec/0x14b0 kernel/signal.c:2321
[<ffffffff8100e02b>] do_signal+0x8b/0x1d30 arch/x86/kernel/signal.c:712
[<ffffffff8100360a>] exit_to_usermode_loop+0x11a/0x160
arch/x86/entry/common.c:248
[<ffffffff81006535>] prepare_exit_to_usermode arch/x86/entry/common.c:283
[inline]
[<ffffffff81006535>] syscall_return_slowpath+0x1b5/0x1f0
arch/x86/entry/common.c:348
[<ffffffff838c29b5>] int_ret_from_sys_call+0x25/0xa3
Allocated by task 4194:
[<ffffffff810341d6>] save_stack_trace+0x26/0x50
arch/x86/kernel/stacktrace.c:63
[<ffffffff814f8873>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
[<ffffffff814f8b57>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff814f8b57>] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:616
[<ffffffff814f9122>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
[<ffffffff814f4c1e>] slab_post_alloc_hook mm/slub.c:1349 [inline]
[<ffffffff814f4c1e>] slab_alloc_node mm/slub.c:2615 [inline]
[<ffffffff814f4c1e>] slab_alloc mm/slub.c:2623 [inline]
[<ffffffff814f4c1e>] kmem_cache_alloc+0xbe/0x2a0 mm/slub.c:2628
[<ffffffff82f380a6>] kmem_cache_alloc_node include/linux/slab.h:350
[inline]
[<ffffffff82f380a6>] __alloc_skb+0xe6/0x600 net/core/skbuff.c:218
[<ffffffff832466c3>] alloc_skb_fclone include/linux/skbuff.h:856 [inline]
[<ffffffff832466c3>] sk_stream_alloc_skb+0xa3/0x5d0 net/ipv4/tcp.c:833
[<ffffffff83249164>] tcp_sendmsg+0xd34/0x2b00 net/ipv4/tcp.c:1178
[<ffffffff83300ef3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
[<ffffffff82f1e1fc>] sock_sendmsg_nosec net/socket.c:625 [inline]
[<ffffffff82f1e1fc>] sock_sendmsg+0xcc/0x110 net/socket.c:635
[<ffffffff82f1eedc>] SYSC_sendto+0x21c/0x370 net/socket.c:1665
[<ffffffff82f21560>] SyS_sendto+0x40/0x50 net/socket.c:1633
[<ffffffff838c2825>] entry_SYSCALL_64_fastpath+0x22/0x9e
Freed by task 4194:
[<ffffffff810341d6>] save_stack_trace+0x26/0x50
arch/x86/kernel/stacktrace.c:63
[<ffffffff814f8873>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
[<ffffffff814f91a2>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff814f91a2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
[<ffffffff814f632e>] slab_free_hook mm/slub.c:1383 [inline]
[<ffffffff814f632e>] slab_free_freelist_hook mm/slub.c:1405 [inline]
[<ffffffff814f632e>] slab_free mm/slub.c:2859 [inline]
[<ffffffff814f632e>] kmem_cache_free+0xbe/0x340 mm/slub.c:2881
[<ffffffff82f3527f>] kfree_skbmem+0xcf/0x100 net/core/skbuff.c:635
[<ffffffff82f372fd>] __kfree_skb+0x1d/0x20 net/core/skbuff.c:676
[<ffffffff83288834>] sk_wmem_free_skb include/net/sock.h:1447 [inline]
[<ffffffff83288834>] tcp_write_queue_purge include/net/tcp.h:1460 [inline]
[<ffffffff83288834>] tcp_connect_init net/ipv4/tcp_output.c:3122 [inline]
[<ffffffff83288834>] tcp_connect+0xb24/0x30c0 net/ipv4/tcp_output.c:3261
[<ffffffff8329b991>] tcp_v4_connect+0xf31/0x1890 net/ipv4/tcp_ipv4.c:246
[<ffffffff832f9ca9>] __inet_stream_connect+0x2a9/0xc30
net/ipv4/af_inet.c:615
[<ffffffff832fa685>] inet_stream_connect+0x55/0xa0 net/ipv4/af_inet.c:676
[<ffffffff82f1eb78>] SYSC_connect+0x1b8/0x300 net/socket.c:1557
[<ffffffff82f214b4>] SyS_connect+0x24/0x30 net/socket.c:1538
[<ffffffff838c2825>] entry_SYSCALL_64_fastpath+0x22/0x9e
The buggy address belongs to the object at ffff8801d6fc8780
which belongs to the cache skbuff_fclone_cache of size 456
The buggy address is located 48 bytes inside of
456-byte region [ffff8801d6fc8780, ffff8801d6fc8948)
The buggy address belongs to the page:
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Initializing cgroup subsys cpuacct
Initializing cgroup subsys schedtune
Linux version 4.4.136-gfb7e319 (syzkaller@ci) (gcc version 8.0.1 20180413
(experimental) (GCC) ) #59 SMP PREEMPT Wed Jun 6 22:04:58 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 nopti
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
Kernel/User page tables isolation: disabled
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 0x000f22b0-0x000f22bf] mapped at
[ffff8800000f22b0]
Scanning 1 areas for low memory corruption
Using GB pages for direct mapping
ACPI: Early table checksum verification disabled
ACPI: RSDP 0x00000000000F2270 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 2315888728 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 nopti
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: 6579092K/7863876K available (41761K kernel code, 6302K rwdata,
9052K rodata, 1864K init, 23696K bss, 1284784K reserved, 0K cma-reserved)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
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 : Mitigation: Full generic retpoline
Freeing SMP alternatives memory: 48K
..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: 27920 bytes left
avx : 21737.600 MB/sec
RTC time: 17:28:06, date: 06/07/18
NET: Registered protocol family 16
schedtune: init normalization constants...
schedtune: no energy model data
schedtune: disabled!
kworker/u4:0 (29) used greatest stack depth: 27616 bytes left
kworker/u4:0 (27) used greatest stack depth: 27024 bytes left
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
raid6: sse2x1 gen() 4814 MB/s
raid6: sse2x1 xor() 2398 MB/s
raid6: sse2x2 gen() 7604 MB/s
raid6: sse2x2 xor() 4230 MB/s
raid6: sse2x4 gen() 9895 MB/s
raid6: sse2x4 xor() 5772 MB/s
raid6: avx2x1 gen() 9486 MB/s
raid6: avx2x2 gen() 14719 MB/s
raid6: avx2x4 gen() 19339 MB/s
raid6: using algorithm avx2x4 gen() 19339 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
---
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.
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