KVM: TDX: Check size of user's kvm_tdx_capabilities array before allocating

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When userspace is getting TDX capabilities, retrieve and check the number
of user entries before allocating kernel scratch space to avoid having to
unwind the allocation if get_user() fails or if 'user_caps' is too small
to fit 'caps'.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Tested-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Link: https://patch.msgid.link/20251017213914.167301-1-thorsten.blum@linux.dev
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Thorsten Blum 2025-10-17 23:39:14 +02:00 • committed by Sean Christopherson

parent 27376465e9

commit 11b79f8318

1 changed files with 7 additions and 11 deletions

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arch/x86/kvm/vmx/tdx.c

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