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authorDavid Matlack <dmatlack@google.com>2024-05-03 20:17:32 +0200
committerSean Christopherson <seanjc@google.com>2024-06-18 18:20:01 +0200
commita6816314af5749cd88944bfdceb270c627cdf348 (patch)
treee082018db936c3d3be6219608524d8a508b1c259 /mm/show_mem.c
parentKVM: selftests: Test vCPU boot IDs above 2^32 and MAX_VCPU_ID (diff)
downloadlinux-a6816314af5749cd88944bfdceb270c627cdf348.tar.xz
linux-a6816314af5749cd88944bfdceb270c627cdf348.zip
KVM: Introduce vcpu->wants_to_run
Introduce vcpu->wants_to_run to indicate when a vCPU is in its core run loop, i.e. when the vCPU is running the KVM_RUN ioctl and immediate_exit was not set. Replace all references to vcpu->run->immediate_exit with !vcpu->wants_to_run to avoid TOCTOU races with userspace. For example, a malicious userspace could invoked KVM_RUN with immediate_exit=true and then after KVM reads it to set wants_to_run=false, flip it to false. This would result in the vCPU running in KVM_RUN with wants_to_run=false. This wouldn't cause any real bugs today but is a dangerous landmine. Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20240503181734.1467938-2-dmatlack@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'mm/show_mem.c')
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