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| author | Kalesh Singh <kaleshsingh@google.com> | 2022-04-20 14:42:56 -0700 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-04-28 20:53:13 +0100 |
| commit | 66de19fad9ef47c5376a99bb2b00661f1c788a94 (patch) | |
| tree | e48f84b936a6cd584013bd9a2c14f077d93cc08f /arch/arm64/kvm/handle_exit.c | |
| parent | 1a919b17ef012ca0572bae759c27e5ea02bfb47f (diff) | |
| download | lwn-66de19fad9ef47c5376a99bb2b00661f1c788a94.tar.gz lwn-66de19fad9ef47c5376a99bb2b00661f1c788a94.zip | |
KVM: arm64: Detect and handle hypervisor stack overflows
The hypervisor stacks (for both nVHE Hyp mode and nVHE protected mode)
are aligned such that any valid stack address has PAGE_SHIFT bit as 1.
This allows us to conveniently check for overflow in the exception entry
without corrupting any GPRs. We won't recover from a stack overflow so
panic the hypervisor.
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220420214317.3303360-6-kaleshsingh@google.com
Diffstat (limited to 'arch/arm64/kvm/handle_exit.c')
0 files changed, 0 insertions, 0 deletions