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2a8dfab266
Fixes a security bug due to mismatched attributes between S1 and S2 mapping. Currently, it is possible for a region to be cacheable in the userspace VMA, but mapped non cached in S2. This creates a potential issue where the VMM may sanitize cacheable memory across VMs using cacheable stores, ensuring it is zeroed. However, if KVM subsequently assigns this memory to a VM as uncached, the VM could end up accessing stale, non-zeroed data from a previous VM, leading to unintended data exposure. This is a security risk. Block such mismatch attributes case by returning EINVAL when userspace try to map PFNMAP cacheable. Only allow NORMAL_NC and DEVICE_*. CC: Oliver Upton <oliver.upton@linux.dev> CC: Catalin Marinas <catalin.marinas@arm.com> CC: Sean Christopherson <seanjc@google.com> Suggested-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: David Hildenbrand <david@redhat.com> Tested-by: Donald Dutile <ddutile@redhat.com> Signed-off-by: Ankit Agrawal <ankita@nvidia.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20250705071717.5062-4-ankita@nvidia.com Signed-off-by: Oliver Upton <oliver.upton@linux.dev> |
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| drivers | ||
| fs | ||
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| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
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| security | ||
| sound | ||
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| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
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| Kbuild | ||
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| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.