| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49154: KVM: SVM: fix panic on out-of-bounds guest IRQ |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| KVM: SVM: fix panic on out-of-bounds guest IRQ |
| |
| As guest_irq is coming from KVM_IRQFD API call, it may trigger |
| crash in svm_update_pi_irte() due to out-of-bounds: |
| |
| crash> bt |
| PID: 22218 TASK: ffff951a6ad74980 CPU: 73 COMMAND: "vcpu8" |
| #0 [ffffb1ba6707fa40] machine_kexec at ffffffff8565b397 |
| #1 [ffffb1ba6707fa90] __crash_kexec at ffffffff85788a6d |
| #2 [ffffb1ba6707fb58] crash_kexec at ffffffff8578995d |
| #3 [ffffb1ba6707fb70] oops_end at ffffffff85623c0d |
| #4 [ffffb1ba6707fb90] no_context at ffffffff856692c9 |
| #5 [ffffb1ba6707fbf8] exc_page_fault at ffffffff85f95b51 |
| #6 [ffffb1ba6707fc50] asm_exc_page_fault at ffffffff86000ace |
| [exception RIP: svm_update_pi_irte+227] |
| RIP: ffffffffc0761b53 RSP: ffffb1ba6707fd08 RFLAGS: 00010086 |
| RAX: ffffb1ba6707fd78 RBX: ffffb1ba66d91000 RCX: 0000000000000001 |
| RDX: 00003c803f63f1c0 RSI: 000000000000019a RDI: ffffb1ba66db2ab8 |
| RBP: 000000000000019a R8: 0000000000000040 R9: ffff94ca41b82200 |
| R10: ffffffffffffffcf R11: 0000000000000001 R12: 0000000000000001 |
| R13: 0000000000000001 R14: ffffffffffffffcf R15: 000000000000005f |
| ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 |
| #7 [ffffb1ba6707fdb8] kvm_irq_routing_update at ffffffffc09f19a1 [kvm] |
| #8 [ffffb1ba6707fde0] kvm_set_irq_routing at ffffffffc09f2133 [kvm] |
| #9 [ffffb1ba6707fe18] kvm_vm_ioctl at ffffffffc09ef544 [kvm] |
| RIP: 00007f143c36488b RSP: 00007f143a4e04b8 RFLAGS: 00000246 |
| RAX: ffffffffffffffda RBX: 00007f05780041d0 RCX: 00007f143c36488b |
| RDX: 00007f05780041d0 RSI: 000000004008ae6a RDI: 0000000000000020 |
| RBP: 00000000000004e8 R8: 0000000000000008 R9: 00007f05780041e0 |
| R10: 00007f0578004560 R11: 0000000000000246 R12: 00000000000004e0 |
| R13: 000000000000001a R14: 00007f1424001c60 R15: 00007f0578003bc0 |
| ORIG_RAX: 0000000000000010 CS: 0033 SS: 002b |
| |
| Vmx have been fix this in commit 3a8b0677fc61 (KVM: VMX: Do not BUG() on |
| out-of-bounds guest IRQ), so we can just copy source from that to fix |
| this. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49154 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.110 with commit 0fb470eb48892e131d10aa3be6915239e65758f3 |
| Fixed in 5.15.33 with commit 3fa2d747960521a646fc1aad7aea82e95e139a68 |
| Fixed in 5.16.19 with commit e4d153d53d9648513481eb4ef8c212e7f1f8173d |
| Fixed in 5.17.2 with commit a6ffdebfb6a9c2ffeed902b544b96fe67498210e |
| Fixed in 5.18 with commit a80ced6ea514000d34bf1239d47553de0d1ee89e |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49154 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| arch/x86/kvm/svm/avic.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/0fb470eb48892e131d10aa3be6915239e65758f3 |
| https://git.kernel.org/stable/c/3fa2d747960521a646fc1aad7aea82e95e139a68 |
| https://git.kernel.org/stable/c/e4d153d53d9648513481eb4ef8c212e7f1f8173d |
| https://git.kernel.org/stable/c/a6ffdebfb6a9c2ffeed902b544b96fe67498210e |
| https://git.kernel.org/stable/c/a80ced6ea514000d34bf1239d47553de0d1ee89e |
