https://github.com/raspberrypi/linux
Revision 3dc5666baf2a135f250e4101d41d5959ac2c2e1f authored by Maxim Levitsky on 19 July 2021, 13:05:00 UTC, committed by Greg Kroah-Hartman on 18 August 2021, 06:59:18 UTC
commit c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc upstream.
If L1 disables VMLOAD/VMSAVE intercepts, and doesn't enable
Virtual VMLOAD/VMSAVE (currently not supported for the nested hypervisor),
then VMLOAD/VMSAVE must operate on the L1 physical memory, which is only
possible by making L0 intercept these instructions.
Failure to do so allowed the nested guest to run VMLOAD/VMSAVE unintercepted,
and thus read/write portions of the host physical memory.
Fixes: 89c8a4984fc9 ("KVM: SVM: Enable Virtual VMLOAD VMSAVE feature")
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 parent c0883f6
Tip revision: 3dc5666baf2a135f250e4101d41d5959ac2c2e1f authored by Maxim Levitsky on 19 July 2021, 13:05:00 UTC
KVM: nSVM: always intercept VMLOAD/VMSAVE when nested (CVE-2021-3656)
KVM: nSVM: always intercept VMLOAD/VMSAVE when nested (CVE-2021-3656)
Tip revision: 3dc5666
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | -rw-r--r-- | 16.3 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 71 bytes |
| .gitattributes | -rw-r--r-- | 62 bytes |
| .gitignore | -rw-r--r-- | 1.9 KB |
| .mailmap | -rw-r--r-- | 17.8 KB |
| COPYING | -rw-r--r-- | 496 bytes |
| CREDITS | -rw-r--r-- | 98.1 KB |
| Kbuild | -rw-r--r-- | 1.3 KB |
| Kconfig | -rw-r--r-- | 555 bytes |
| MAINTAINERS | -rw-r--r-- | 563.2 KB |
| Makefile | -rw-r--r-- | 63.7 KB |
| README | -rw-r--r-- | 727 bytes |
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