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authorKalesh Singh <kaleshsingh@google.com>2022-04-21 00:42:56 +0300
committerMarc Zyngier <maz@kernel.org>2022-04-28 22:53:13 +0300
commit66de19fad9ef47c5376a99bb2b00661f1c788a94 (patch)
treee48f84b936a6cd584013bd9a2c14f077d93cc08f /scripts/kallsyms.c
parent1a919b17ef012ca0572bae759c27e5ea02bfb47f (diff)
downloadlinux-66de19fad9ef47c5376a99bb2b00661f1c788a94.tar.xz
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
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