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KVM: arm64: Zero out the stack initialized data in the FFA handler

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Don't leak hypervisor stack data when using the FFA_VERSION call.
When the compiler doesn't support -ftrivial-auto-var-init=zero option
we need to zero out the stack initialized variable before returning data
to the host caller.

Closes:
https://lore.kernel.org/all/20260616160016.C62C81F000E9@smtp.kernel.org/

Reported-by: Sashiko AI <sashiko-bot@kernel.org>
Fixes: c9c012625e ("KVM: arm64: Trap FFA_VERSION host call in pKVM")
Reviewed-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/all/20260616160016.C62C81F000E9@smtp.kernel.org/
Signed-off-by: Sebastian Ene <sebastianene@google.com>
Link: https://patch.msgid.link/20260702103848.1647249-7-sebastianene@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Sebastian Ene 2026-07-02 10:38:43 +00:00 committed by Marc Zyngier
parent 6a7a181f69
commit 2bd3c6c702
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/hyp/nvhe/ffa.c
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@ -880,7 +880,7 @@ static void do_ffa_part_get(struct arm_smccc_1_2_regs *res,
bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id)
{
struct arm_smccc_1_2_regs res;
struct arm_smccc_1_2_regs res = {0};
/*
* There's no way we can tell what a non-standard SMC call might