In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Immediately reset the MMU context when the SMM flag is cleared Immediately reset the MMU context when the vCPU's SMM flag is cleared so that the SMM flag in the MMU role is always synchronized with the vCPU's flag. If RSM fails (which isn't correctly emulated), KVM will bail without calling postleavesmm() and leave the MMU in a bad state. The bad MMU role can lead to a NULL pointer dereference when grabbing a shadow page's rmap for a page fault as the initial lookups for the gfn will happen with the vCPU's SMM flag (=0), whereas the rmap lookup will use the shadow page's SMM flag, which comes from the MMU (=1). SMM has an entirely different set of memslots, and so the initial lookup can find a memslot (SMM=0) and then explode on the rmap memslot lookup (SMM=1). general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 8410 Comm: syz-executor382 Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:_gfntormap arch/x86/kvm/mmu/mmu.c:935 [inline] RIP: 0010:gfntormap+0x2b0/0x4d0 arch/x86/kvm/mmu/mmu.c:947 Code: <42> 80 3c 20 00 74 08 4c 89 ff e8 f1 79 a9 00 4c 89 fb 4d 8b 37 44 RSP: 0018:ffffc90000ffef98 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888015b9f414 RCX: ffff888019669c40 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff811d9cdb R09: ffffed10065a6002 R10: ffffed10065a6002 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000003 R14: 0000000000000001 R15: 0000000000000000 FS: 000000000124b300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000028e31000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rmapadd arch/x86/kvm/mmu/mmu.c:965 [inline] mmusetspte+0x862/0xe60 arch/x86/kvm/mmu/mmu.c:2604 _directmap arch/x86/kvm/mmu/mmu.c:2862 [inline] directpagefault+0x1f74/0x2b70 arch/x86/kvm/mmu/mmu.c:3769 kvmmmudopagefault arch/x86/kvm/mmu.h:124 [inline] kvmmmupagefault+0x199/0x1440 arch/x86/kvm/mmu/mmu.c:5065 vmxhandleexit+0x26/0x160 arch/x86/kvm/vmx/vmx.c:6122 vcpuenterguest+0x3bdd/0x9630 arch/x86/kvm/x86.c:9428 vcpurun+0x416/0xc20 arch/x86/kvm/x86.c:9494 kvmarchvcpuioctlrun+0x4e8/0xa40 arch/x86/kvm/x86.c:9722 kvmvcpuioctl+0x70f/0xbb0 arch/x86/kvm/../../../virt/kvm/kvmmain.c:3460 vfsioctl fs/ioctl.c:51 [inline] _dosysioctl fs/ioctl.c:1069 [inline] _sesysioctl+0xfb/0x170 fs/ioctl.c:1055 dosyscall64+0x3f/0xb0 arch/x86/entry/common.c:47 entrySYSCALL64afterhwframe+0x44/0xae RIP: 0033:0x440ce9
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{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "binaries": [ { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-aws-fips-headers-5.4.0-1069" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-aws-fips-tools-5.4.0-1069" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-buildinfo-5.4.0-1069-aws-fips" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-headers-5.4.0-1069-aws-fips" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-image-unsigned-5.4.0-1069-aws-fips" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-image-unsigned-5.4.0-1069-aws-fips-dbgsym" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-image-unsigned-hmac-5.4.0-1069-aws-fips" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-modules-5.4.0-1069-aws-fips" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-modules-extra-5.4.0-1069-aws-fips" }, { "binary_version": "5.4.0-1069.73+fips2", "binary_name": "linux-tools-5.4.0-1069-aws-fips" } ] }
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "binaries": [ { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-azure-fips-cloud-tools-5.4.0-1073" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-azure-fips-headers-5.4.0-1073" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-azure-fips-tools-5.4.0-1073" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-buildinfo-5.4.0-1073-azure-fips" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-cloud-tools-5.4.0-1073-azure-fips" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-headers-5.4.0-1073-azure-fips" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-image-unsigned-5.4.0-1073-azure-fips" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-image-unsigned-5.4.0-1073-azure-fips-dbgsym" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-image-unsigned-hmac-5.4.0-1073-azure-fips" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-modules-5.4.0-1073-azure-fips" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-modules-extra-5.4.0-1073-azure-fips" }, { "binary_version": "5.4.0-1073.76+fips1", "binary_name": "linux-tools-5.4.0-1073-azure-fips" } ] }
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "binaries": [ { "binary_version": "5.4.0-1032.37", "binary_name": "linux-buildinfo-5.4.0-1032-fips" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-fips-headers-5.4.0-1032" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-fips-tools-5.4.0-1032" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-fips-tools-host" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-headers-5.4.0-1032-fips" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-image-unsigned-5.4.0-1032-fips" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-image-unsigned-5.4.0-1032-fips-dbgsym" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-image-unsigned-hmac-5.4.0-1032-fips" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-modules-5.4.0-1032-fips" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-modules-extra-5.4.0-1032-fips" }, { "binary_version": "5.4.0-1032.37", "binary_name": "linux-tools-5.4.0-1032-fips" } ] }
{ "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro", "binaries": [ { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-buildinfo-5.4.0-1067-gcp-fips" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-gcp-fips-headers-5.4.0-1067" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-gcp-fips-tools-5.4.0-1067" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-headers-5.4.0-1067-gcp-fips" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-image-unsigned-5.4.0-1067-gcp-fips" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-image-unsigned-5.4.0-1067-gcp-fips-dbgsym" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-image-unsigned-hmac-5.4.0-1067-gcp-fips" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-modules-5.4.0-1067-gcp-fips" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-modules-extra-5.4.0-1067-gcp-fips" }, { "binary_version": "5.4.0-1067.71~20.04.1", "binary_name": "linux-tools-5.4.0-1067-gcp-fips" } ] }