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| author | Quentin Perret <[email protected]> | 2025-02-13 15:36:14 +0000 |
|---|---|---|
| committer | Marc Zyngier <[email protected]> | 2025-02-13 17:57:27 +0000 |
| commit | b938731ed2d4eea8e268a27bfc600581fedae2a9 (patch) | |
| tree | 51f03a7fb0c8fd13a2c27783dfc1e9b6b8fe8f59 /lib/test_bitmap.c | |
| parent | KVM: arm64: Convert timer offset VA when accessed in HYP code (diff) | |
| download | kernel-b938731ed2d4eea8e268a27bfc600581fedae2a9.tar.gz kernel-b938731ed2d4eea8e268a27bfc600581fedae2a9.zip | |
KVM: arm64: Fix alignment of kvm_hyp_memcache allocations
When allocating guest stage-2 page-table pages at EL2, pKVM can consume
pages from the host-provided kvm_hyp_memcache. As pgtable.c expects
zeroed pages, guest_s2_zalloc_page() actively implements this zeroing
with a PAGE_SIZE memset. Unfortunately, we don't check the page
alignment of the host-provided address before doing so, which could
lead to the memset overrunning the page if the host was malicious.
Fix this by simply force-aligning all kvm_hyp_memcache allocations to
page boundaries.
Fixes: 60dfe093ec13 ("KVM: arm64: Instantiate guest stage-2 page-tables at EL2")
Reported-by: Ben Simner <[email protected]>
Signed-off-by: Quentin Perret <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Marc Zyngier <[email protected]>
Diffstat (limited to 'lib/test_bitmap.c')
0 files changed, 0 insertions, 0 deletions