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authorPaolo Bonzini <pbonzini@redhat.com>2021-11-22 18:20:16 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2021-11-26 06:43:28 -0500
commit8503fea6761de32b72585001ac94e5f81ce8ca44 (patch)
treef96061abbabe1d65115ea53ebfafa431b26d64e3 /virt
parentd5d1cf47d17d33bc958c6f2fd6fa586e17c08509 (diff)
KVM: VMX: do not use uninitialized gfn_to_hva_cache
An uninitialized gfn_to_hva_cache has ghc->len == 0, which causes the accessors to croak very loudly. While a BUG_ON is definitely _too_ loud and a bug on its own, there is indeed an issue of using the caches in such a way that they could not have been initialized, because ghc->gpa == 0 might match and thus kvm_gfn_to_hva_cache_init would not be called. For the vmcs12_cache, the solution is simply to invoke kvm_gfn_to_hva_cache_init unconditionally: we already know that the cache does not match the current VMCS pointer. For the shadow_vmcs12_cache, there is no similar condition that checks the VMCS link pointer, so invalidate the cache on VMXON. Fixes: cee66664dcd6 ("KVM: nVMX: Use a gfn_to_hva_cache for vmptrld") Acked-by: David Woodhouse <dwmw@amazon.co.uk> Reported-by: syzbot+7b7db8bb4db6fd5e157b@syzkaller.appspotmail.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
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