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  1. 27 11月, 2018 19 次提交
    • K
      nVMX x86: Check VMX-preemption timer controls on vmentry of L2 guests · 14aa61d0
      由 Krish Sadhukhan 提交于 
      According to section "Checks on VMX Controls" in Intel SDM vol 3C, the
following check needs to be enforced on vmentry of L2 guests:

    If the "activate VMX-preemption timer" VM-execution control is 0, the
    the "save VMX-preemption timer value" VM-exit control must also be 0.
Signed-off-by: NKrish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: NMihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: NLiran Alon <liran.alon@oracle.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      14aa61d0
    • U
      KVM/nVMX: Remove unneeded forward jump in nested_vmx_check_vmentry_hw asm · 00df9181
      由 Uros Bizjak 提交于 
      There is no need to jump just after the jump insn itself. Also, make
code similar to entering guest mode in vmx_vcpu_run.
Signed-off-by: NUros Bizjak <ubizjak@gmail.com>
Reviewed-by: NJim Mattson <jmattson@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      00df9181
    • J
      KVM: nVMX: Unrestricted guest mode requires EPT · 88656040
      由 Jim Mattson 提交于 
      As specified in Intel's SDM, do not allow the L1 hypervisor to launch
an L2 guest with the VM-execution controls for "unrestricted guest" or
"mode-based execute control for EPT" set and the VM-execution control
for "enable EPT" clear.

Note that the VM-execution control for "mode-based execute control for
EPT" is not yet virtualized by kvm.
Reported-by: NAndrew Thornton <andrewth@google.com>
Signed-off-by: NJim Mattson <jmattson@google.com>
Reviewed-by: NPeter Shier <pshier@google.com>
Reviewed-by: NSean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: NWanpeng Li <wanpengli@tencent.com>
Reviewed-by: NLiran Alon <liran.alon@oracle.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      88656040
    • S
      tools/kvm_stat: switch to python3 · 09f70c3b
      由 Stefan Raspl 提交于 
      The current shebang does not work in environments that only support python3
and have no python2 installed. Plus there does not seem to be a way to
support python2 and python3 at the same time. Since all known python3 issues
were fixed, and as python3 is the way to go, let's switch over.
Note that the code is still python2 compliant, so folks in bad use can
simply revert the shebang.
Suggested-by: NChristian Ehrhardt <christian.ehrhardt@canonical.com>
Signed-off-by: NStefan Raspl <raspl@linux.ibm.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      09f70c3b
    • P
      KVM: x86: Trace changes to active TSC offset regardless if vCPU in guest-mode · 45c3af97
      由 Paolo Bonzini 提交于 
      For some reason, kvm_x86_ops->write_l1_tsc_offset() skipped trace
of change to active TSC offset in case vCPU is in guest-mode.
This patch changes write_l1_tsc_offset() behavior to trace any change
to active TSC offset to aid debugging.  The VMX code is changed to
look more similar to SVM, which is in my opinion nicer.

Based on a patch by Liran Alon.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      45c3af97
    • J
      kvm: svm: Ensure an IBPB on all affected CPUs when freeing a vmcb · fd65d314
      由 Jim Mattson 提交于 
      Previously, we only called indirect_branch_prediction_barrier on the
logical CPU that freed a vmcb. This function should be called on all
logical CPUs that last loaded the vmcb in question.

Fixes: 15d45071 ("KVM/x86: Add IBPB support")
Reported-by: NNeel Natu <neelnatu@google.com>
Signed-off-by: NJim Mattson <jmattson@google.com>
Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      fd65d314
    • J
      kvm: mmu: Fix race in emulated page table writes · 0e0fee5c
      由 Junaid Shahid 提交于 
      When a guest page table is updated via an emulated write,
kvm_mmu_pte_write() is called to update the shadow PTE using the just
written guest PTE value. But if two emulated guest PTE writes happened
concurrently, it is possible that the guest PTE and the shadow PTE end
up being out of sync. Emulated writes do not mark the shadow page as
unsync-ed, so this inconsistency will not be resolved even by a guest TLB
flush (unless the page was marked as unsync-ed at some other point).

This is fixed by re-reading the current value of the guest PTE after the
MMU lock has been acquired instead of just using the value that was
written prior to calling kvm_mmu_pte_write().
Signed-off-by: NJunaid Shahid <junaids@google.com>
Reviewed-by: NWanpeng Li <wanpengli@tencent.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      0e0fee5c
    • L
      KVM: nVMX: vmcs12 revision_id is always VMCS12_REVISION even when copied from eVMCS · 52ad7eb3
      由 Liran Alon 提交于 
      vmcs12 represents the per-CPU cache of L1 active vmcs12.

This cache can be loaded by one of the following:
1) Guest making a vmcs12 active by exeucting VMPTRLD
2) Guest specifying eVMCS in VP assist page and executing
VMLAUNCH/VMRESUME.

Either way, vmcs12 should have revision_id of VMCS12_REVISION.
Which is not equal to eVMCS revision_id which specifies used
VersionNumber of eVMCS struct (e.g. KVM_EVMCS_VERSION).

Specifically, this causes an issue in restoring a nested VM state
because vmx_set_nested_state() verifies that vmcs12->revision_id
is equal to VMCS12_REVISION which was not true in case vmcs12
was populated from an eVMCS by vmx_get_nested_state() which calls
copy_enlightened_to_vmcs12().
Reviewed-by: NDarren Kenny <darren.kenny@oracle.com>
Signed-off-by: NLiran Alon <liran.alon@oracle.com>
Reviewed-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      52ad7eb3
    • L
      KVM: nVMX: Verify eVMCS revision id match supported eVMCS version on eVMCS VMPTRLD · 72aeb60c
      由 Liran Alon 提交于 
      According to TLFS section 16.11.2 Enlightened VMCS, the first u32
field of eVMCS should specify eVMCS VersionNumber.

This version should be in the range of supported eVMCS versions exposed
to guest via CPUID.0x4000000A.EAX[0:15].
The range which KVM expose to guest in this CPUID field should be the
same as the value returned in vmcs_version by nested_enable_evmcs().

According to the above, eVMCS VMPTRLD should verify that version specified
in given eVMCS is in the supported range. However, current code
mistakenly verfies this field against VMCS12_REVISION.

One can also see that when KVM use eVMCS, it makes sure that
alloc_vmcs_cpu() sets allocated eVMCS revision_id to KVM_EVMCS_VERSION.

Obvious fix should just change eVMCS VMPTRLD to verify first u32 field
of eVMCS is equal to KVM_EVMCS_VERSION.
However, it turns out that Microsoft Hyper-V fails to comply to their
own invented interface: When Hyper-V use eVMCS, it just sets first u32
field of eVMCS to revision_id specified in MSR_IA32_VMX_BASIC (In our
case: VMCS12_REVISION). Instead of used eVMCS version number which is
one of the supported versions specified in CPUID.0x4000000A.EAX[0:15].
To overcome Hyper-V bug, we accept either a supported eVMCS version
or VMCS12_REVISION as valid values for first u32 field of eVMCS.

Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: NNikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: NMark Kanda <mark.kanda@oracle.com>
Signed-off-by: NLiran Alon <liran.alon@oracle.com>
Reviewed-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      72aeb60c
    • L
      KVM: nVMX/nSVM: Fix bug which sets vcpu->arch.tsc_offset to L1 tsc_offset · 326e7425
      由 Leonid Shatz 提交于 
      Since commit e79f245d ("X86/KVM: Properly update 'tsc_offset' to
represent the running guest"), vcpu->arch.tsc_offset meaning was
changed to always reflect the tsc_offset value set on active VMCS.
Regardless if vCPU is currently running L1 or L2.

However, above mentioned commit failed to also change
kvm_vcpu_write_tsc_offset() to set vcpu->arch.tsc_offset correctly.
This is because vmx_write_tsc_offset() could set the tsc_offset value
in active VMCS to given offset parameter *plus vmcs12->tsc_offset*.
However, kvm_vcpu_write_tsc_offset() just sets vcpu->arch.tsc_offset
to given offset parameter. Without taking into account the possible
addition of vmcs12->tsc_offset. (Same is true for SVM case).

Fix this issue by changing kvm_x86_ops->write_tsc_offset() to return
actually set tsc_offset in active VMCS and modify
kvm_vcpu_write_tsc_offset() to set returned value in
vcpu->arch.tsc_offset.
In addition, rename write_tsc_offset() callback to write_l1_tsc_offset()
to make it clear that it is meant to set L1 TSC offset.

Fixes: e79f245d ("X86/KVM: Properly update 'tsc_offset' to represent the running guest")
Reviewed-by: NLiran Alon <liran.alon@oracle.com>
Reviewed-by: NMihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: NKrish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: NLeonid Shatz <leonid.shatz@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      326e7425
    • Y
      x86/kvm/vmx: fix old-style function declaration · 1e4329ee
      由 Yi Wang 提交于 
      The inline keyword which is not at the beginning of the function
declaration may trigger the following build warnings, so let's fix it:

arch/x86/kvm/vmx.c:1309:1: warning: ‘inline’ is not at beginning of declaration [-Wold-style-declaration]
arch/x86/kvm/vmx.c:5947:1: warning: ‘inline’ is not at beginning of declaration [-Wold-style-declaration]
arch/x86/kvm/vmx.c:5985:1: warning: ‘inline’ is not at beginning of declaration [-Wold-style-declaration]
arch/x86/kvm/vmx.c:6023:1: warning: ‘inline’ is not at beginning of declaration [-Wold-style-declaration]
Signed-off-by: NYi Wang <wang.yi59@zte.com.cn>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      1e4329ee
    • Y
      KVM: x86: fix empty-body warnings · 354cb410
      由 Yi Wang 提交于 
      We get the following warnings about empty statements when building
with 'W=1':

arch/x86/kvm/lapic.c:632:53: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
arch/x86/kvm/lapic.c:1907:42: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
arch/x86/kvm/lapic.c:1936:65: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
arch/x86/kvm/lapic.c:1975:44: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]

Rework the debug helper macro to get rid of these warnings.
Signed-off-by: NYi Wang <wang.yi59@zte.com.cn>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      354cb410
    • L
      KVM: VMX: Update shared MSRs to be saved/restored on MSR_EFER.LMA changes · f48b4711
      由 Liran Alon 提交于 
      When guest transitions from/to long-mode by modifying MSR_EFER.LMA,
the list of shared MSRs to be saved/restored on guest<->host
transitions is updated (See vmx_set_efer() call to setup_msrs()).

On every entry to guest, vcpu_enter_guest() calls
vmx_prepare_switch_to_guest(). This function should also take care
of setting the shared MSRs to be saved/restored. However, the
function does nothing in case we are already running with loaded
guest state (vmx->loaded_cpu_state != NULL).

This means that even when guest modifies MSR_EFER.LMA which results
in updating the list of shared MSRs, it isn't being taken into account
by vmx_prepare_switch_to_guest() because it happens while we are
running with loaded guest state.

To fix above mentioned issue, add a flag to mark that the list of
shared MSRs has been updated and modify vmx_prepare_switch_to_guest()
to set shared MSRs when running with host state *OR* list of shared
MSRs has been updated.

Note that this issue was mistakenly introduced by commit
678e315e ("KVM: vmx: add dedicated utility to access guest's
kernel_gs_base") because previously vmx_set_efer() always called
vmx_load_host_state() which resulted in vmx_prepare_switch_to_guest() to
set shared MSRs.

Fixes: 678e315e ("KVM: vmx: add dedicated utility to access guest's kernel_gs_base")
Reported-by: NEyal Moscovici <eyal.moscovici@oracle.com>
Reviewed-by: NMihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: NLiam Merwick <liam.merwick@oracle.com>
Reviewed-by: NJim Mattson <jmattson@google.com>
Signed-off-by: NLiran Alon <liran.alon@oracle.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      f48b4711
    • L
      KVM: x86: Fix kernel info-leak in KVM_HC_CLOCK_PAIRING hypercall · bcbfbd8e
      由 Liran Alon 提交于 
      kvm_pv_clock_pairing() allocates local var
"struct kvm_clock_pairing clock_pairing" on stack and initializes
all it's fields besides padding (clock_pairing.pad[]).

Because clock_pairing var is written completely (including padding)
to guest memory, failure to init struct padding results in kernel
info-leak.

Fix the issue by making sure to also init the padding with zeroes.

Fixes: 55dd00a7 ("KVM: x86: add KVM_HC_CLOCK_PAIRING hypercall")
Reported-by: syzbot+a8ef68d71211ba264f56@syzkaller.appspotmail.com
Reviewed-by: NMark Kanda <mark.kanda@oracle.com>
Signed-off-by: NLiran Alon <liran.alon@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      bcbfbd8e
    • L
      KVM: nVMX: Fix kernel info-leak when enabling KVM_CAP_HYPERV_ENLIGHTENED_VMCS more than once · 7f9ad1df
      由 Liran Alon 提交于 
      Consider the case that userspace enables KVM_CAP_HYPERV_ENLIGHTENED_VMCS twice:
1) kvm_vcpu_ioctl_enable_cap() is called to enable
KVM_CAP_HYPERV_ENLIGHTENED_VMCS which calls nested_enable_evmcs().
2) nested_enable_evmcs() sets enlightened_vmcs_enabled to true and fills
vmcs_version which is then copied to userspace.
3) kvm_vcpu_ioctl_enable_cap() is called again to enable
KVM_CAP_HYPERV_ENLIGHTENED_VMCS which calls nested_enable_evmcs().
4) This time nested_enable_evmcs() just returns 0 as
enlightened_vmcs_enabled is already true. *Without filling
vmcs_version*.
5) kvm_vcpu_ioctl_enable_cap() continues as usual and copies
*uninitialized* vmcs_version to userspace which leads to kernel info-leak.

Fix this issue by simply changing nested_enable_evmcs() to always fill
vmcs_version output argument. Even when enlightened_vmcs_enabled is
already set to true.

Note that SVM's nested_enable_evmcs() should not be modified because it
always returns a non-zero value (-ENODEV) which results in
kvm_vcpu_ioctl_enable_cap() skipping the copy of vmcs_version to
userspace (as it should).

Fixes: 57b119da ("KVM: nVMX: add KVM_CAP_HYPERV_ENLIGHTENED_VMCS capability")
Reported-by: syzbot+cfbc368e283d381f8cef@syzkaller.appspotmail.com
Reviewed-by: NKrish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: NLiran Alon <liran.alon@oracle.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      7f9ad1df
    • W
      svm: Add mutex_lock to protect apic_access_page_done on AMD systems · 30510387
      由 Wei Wang 提交于 
      There is a race condition when accessing kvm->arch.apic_access_page_done.
Due to it, x86_set_memory_region will fail when creating the second vcpu
for a svm guest.

Add a mutex_lock to serialize the accesses to apic_access_page_done.
This lock is also used by vmx for the same purpose.
Signed-off-by: NWei Wang <wawei@amazon.de>
Signed-off-by: NAmadeusz Juskowiak <ajusk@amazon.de>
Signed-off-by: NJulian Stecklina <jsteckli@amazon.de>
Signed-off-by: NSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: NJoerg Roedel <jroedel@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      30510387
    • W
      KVM: X86: Fix scan ioapic use-before-initialization · e97f852f
      由 Wanpeng Li 提交于 
      Reported by syzkaller:

 BUG: unable to handle kernel NULL pointer dereference at 00000000000001c8
 PGD 80000003ec4da067 P4D 80000003ec4da067 PUD 3f7bfa067 PMD 0
 Oops: 0000 [#1] PREEMPT SMP PTI
 CPU: 7 PID: 5059 Comm: debug Tainted: G           OE     4.19.0-rc5 #16
 RIP: 0010:__lock_acquire+0x1a6/0x1990
 Call Trace:
  lock_acquire+0xdb/0x210
  _raw_spin_lock+0x38/0x70
  kvm_ioapic_scan_entry+0x3e/0x110 [kvm]
  vcpu_enter_guest+0x167e/0x1910 [kvm]
  kvm_arch_vcpu_ioctl_run+0x35c/0x610 [kvm]
  kvm_vcpu_ioctl+0x3e9/0x6d0 [kvm]
  do_vfs_ioctl+0xa5/0x690
  ksys_ioctl+0x6d/0x80
  __x64_sys_ioctl+0x1a/0x20
  do_syscall_64+0x83/0x6e0
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The reason is that the testcase writes hyperv synic HV_X64_MSR_SINT6 msr
and triggers scan ioapic logic to load synic vectors into EOI exit bitmap.
However, irqchip is not initialized by this simple testcase, ioapic/apic
objects should not be accessed.
This can be triggered by the following program:

    #define _GNU_SOURCE

    #include <endian.h>
    #include <stdint.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <sys/syscall.h>
    #include <sys/types.h>
    #include <unistd.h>

    uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

    int main(void)
    {
    	syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
    	long res = 0;
    	memcpy((void*)0x20000040, "/dev/kvm", 9);
    	res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0, 0);
    	if (res != -1)
    		r[0] = res;
    	res = syscall(__NR_ioctl, r[0], 0xae01, 0);
    	if (res != -1)
    		r[1] = res;
    	res = syscall(__NR_ioctl, r[1], 0xae41, 0);
    	if (res != -1)
    		r[2] = res;
    	memcpy(
    			(void*)0x20000080,
    			"\x01\x00\x00\x00\x00\x5b\x61\xbb\x96\x00\x00\x40\x00\x00\x00\x00\x01\x00"
    			"\x08\x00\x00\x00\x00\x00\x0b\x77\xd1\x78\x4d\xd8\x3a\xed\xb1\x5c\x2e\x43"
    			"\xaa\x43\x39\xd6\xff\xf5\xf0\xa8\x98\xf2\x3e\x37\x29\x89\xde\x88\xc6\x33"
    			"\xfc\x2a\xdb\xb7\xe1\x4c\xac\x28\x61\x7b\x9c\xa9\xbc\x0d\xa0\x63\xfe\xfe"
    			"\xe8\x75\xde\xdd\x19\x38\xdc\x34\xf5\xec\x05\xfd\xeb\x5d\xed\x2e\xaf\x22"
    			"\xfa\xab\xb7\xe4\x42\x67\xd0\xaf\x06\x1c\x6a\x35\x67\x10\x55\xcb",
    			106);
    	syscall(__NR_ioctl, r[2], 0x4008ae89, 0x20000080);
    	syscall(__NR_ioctl, r[2], 0xae80, 0);
    	return 0;
    }

This patch fixes it by bailing out scan ioapic if ioapic is not initialized in
kernel.
Reported-by: NWei Wu <ww9210@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Wei Wu <ww9210@gmail.com>
Signed-off-by: NWanpeng Li <wanpengli@tencent.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      e97f852f
    • W
      KVM: LAPIC: Fix pv ipis use-before-initialization · 38ab012f
      由 Wanpeng Li 提交于 
      Reported by syzkaller:

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000014
 PGD 800000040410c067 P4D 800000040410c067 PUD 40410d067 PMD 0
 Oops: 0000 [#1] PREEMPT SMP PTI
 CPU: 3 PID: 2567 Comm: poc Tainted: G           OE     4.19.0-rc5 #16
 RIP: 0010:kvm_pv_send_ipi+0x94/0x350 [kvm]
 Call Trace:
  kvm_emulate_hypercall+0x3cc/0x700 [kvm]
  handle_vmcall+0xe/0x10 [kvm_intel]
  vmx_handle_exit+0xc1/0x11b0 [kvm_intel]
  vcpu_enter_guest+0x9fb/0x1910 [kvm]
  kvm_arch_vcpu_ioctl_run+0x35c/0x610 [kvm]
  kvm_vcpu_ioctl+0x3e9/0x6d0 [kvm]
  do_vfs_ioctl+0xa5/0x690
  ksys_ioctl+0x6d/0x80
  __x64_sys_ioctl+0x1a/0x20
  do_syscall_64+0x83/0x6e0
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The reason is that the apic map has not yet been initialized, the testcase
triggers pv_send_ipi interface by vmcall which results in kvm->arch.apic_map
is dereferenced. This patch fixes it by checking whether or not apic map is
NULL and bailing out immediately if that is the case.

Fixes: 4180bf1b (KVM: X86: Implement "send IPI" hypercall)
Reported-by: NWei Wu <ww9210@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Wei Wu <ww9210@gmail.com>
Signed-off-by: NWanpeng Li <wanpengli@tencent.com>
Cc: stable@vger.kernel.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      38ab012f
    • L
      KVM: VMX: re-add ple_gap module parameter · a87c99e6
      由 Luiz Capitulino 提交于 
      Apparently, the ple_gap parameter was accidentally removed
by commit c8e88717. Add it
back.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Cc: stable@vger.kernel.org
Fixes: c8e88717Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      a87c99e6
  3. 26 11月, 2018 1 次提交
  5. 19 11月, 2018 20 次提交