On 07/10/19 14:36, Jack Wang wrote:
> From: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxx>
>
> During backport f7eea636c3d5 ("KVM: nVMX: handle page fault in vmread"),
> there was a mistake the exception reference should be passed to function
> kvm_write_guest_virt_system, instead of NULL, other wise, we will get
> NULL pointer deref, eg
>
> kvm-unit-test triggered a NULL pointer deref below:
> [ 948.518437] kvm [24114]: vcpu0, guest rIP: 0x407ef9 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR 0x3, nop
> [ 949.106464] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> [ 949.106707] PGD 0 P4D 0
> [ 949.106872] Oops: 0002 [#1] SMP
> [ 949.107038] CPU: 2 PID: 24126 Comm: qemu-2.7 Not tainted 4.19.77-pserver #4.19.77-1+feature+daily+update+20191005.1625+a4168bb~deb9
> [ 949.107283] Hardware name: Dell Inc. Precision Tower 3620/09WH54, BIOS 2.7.3 01/31/2018
> [ 949.107549] RIP: 0010:kvm_write_guest_virt_system+0x12/0x40 [kvm]
> [ 949.107719] Code: c0 5d 41 5c 41 5d 41 5e 83 f8 03 41 0f 94 c0 41 c1 e0 02 e9 b0 ed ff ff 0f 1f 44 00 00 48 89 f0 c6 87 59 56 00 00 01 48 89 d6 <49> c7 00 00 00 00 00 89 ca 49 c7 40 08 00 00 00 00 49 c7 40 10 00
> [ 949.108044] RSP: 0018:ffffb31b0a953cb0 EFLAGS: 00010202
> [ 949.108216] RAX: 000000000046b4d8 RBX: ffff9e9f415b0000 RCX: 0000000000000008
> [ 949.108389] RDX: ffffb31b0a953cc0 RSI: ffffb31b0a953cc0 RDI: ffff9e9f415b0000
> [ 949.108562] RBP: 00000000d2e14928 R08: 0000000000000000 R09: 0000000000000000
> [ 949.108733] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffffffffc8
> [ 949.108907] R13: 0000000000000002 R14: ffff9e9f4f26f2e8 R15: 0000000000000000
> [ 949.109079] FS: 00007eff8694c700(0000) GS:ffff9e9f51a80000(0000) knlGS:0000000031415928
> [ 949.109318] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 949.109495] CR2: 0000000000000000 CR3: 00000003be53b002 CR4: 00000000003626e0
> [ 949.109671] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 949.109845] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 949.110017] Call Trace:
> [ 949.110186] handle_vmread+0x22b/0x2f0 [kvm_intel]
> [ 949.110356] ? vmexit_fill_RSB+0xc/0x30 [kvm_intel]
> [ 949.110549] kvm_arch_vcpu_ioctl_run+0xa98/0x1b30 [kvm]
> [ 949.110725] ? kvm_vcpu_ioctl+0x388/0x5d0 [kvm]
> [ 949.110901] kvm_vcpu_ioctl+0x388/0x5d0 [kvm]
> [ 949.111072] do_vfs_ioctl+0xa2/0x620
>
> Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxx>
> ---
> arch/x86/kvm/vmx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index f6b0f5c01546..3bfdbb5fced5 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -8026,7 +8026,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
> /* _system ok, nested_vmx_check_permission has verified cpl=0 */
> if (kvm_write_guest_virt_system(vcpu, gva, &field_value,
> (is_long_mode(vcpu) ? 8 : 4),
> - NULL))
> + &e))
> kvm_inject_page_fault(vcpu, &e);
> }
>
>
Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Thanks,
Paolo
