Ubuntu: (Multiple Advisories) (CVE-2024-38610): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: drivers/virt/acrn: fix PFNMAP PTE checks in acrn_vm_ram_map() Patch series "mm: follow_pte() improvements and acrn follow_pte() fixes". Patch #1 fixes a bunch of issues I spotted in the acrn driver. It compiles, that's all I know. I'll appreciate some review and testing from acrn folks. Patch #2+#3 improve follow_pte(), passing a VMA instead of the MM, adding more sanity checks, and improving the documentation. Gave it a quick test on x86-64 using VM_PAT that ends up using follow_pte(). This patch (of 3): We currently miss handling various cases, resulting in a dangerous follow_pte() (previously follow_pfn()) usage. (1) We're not checking PTE write permissions. Maybe we should simply always require pte_write() like we do for pin_user_pages_fast(FOLL_WRITE)? Hard to tell, so let's check for ACRN_MEM_ACCESS_WRITE for now. (2) We're not rejecting refcounted pages. As we are not using MMU notifiers, messing with refcounted pages is dangerous and can result in use-after-free. Let's make sure to reject them. (3) We are only looking at the first PTE of a bigger range. We only lookup a single PTE, but memmap->len may span a larger area. Let's loop over all involved PTEs and make sure the PFN range is actually contiguous. Reject everything else: it couldn't have worked either way, and rather made use access PFNs we shouldn't be accessing.
Solution(s)
- ubuntu-upgrade-linux-image-6-8-0-1008-gke
- ubuntu-upgrade-linux-image-6-8-0-1009-raspi
- ubuntu-upgrade-linux-image-6-8-0-1010-ibm
- ubuntu-upgrade-linux-image-6-8-0-1010-oem
- ubuntu-upgrade-linux-image-6-8-0-1010-oracle
- ubuntu-upgrade-linux-image-6-8-0-1010-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1011-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1012-gcp
- ubuntu-upgrade-linux-image-6-8-0-1013-aws
- ubuntu-upgrade-linux-image-6-8-0-40-generic
- ubuntu-upgrade-linux-image-6-8-0-40-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-40-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-40-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-24-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-6-8
- ubuntu-upgrade-linux-image-nvidia-64k
- ubuntu-upgrade-linux-image-nvidia-64k-6-8
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-oem-24-04
- ubuntu-upgrade-linux-image-oem-24-04a
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
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