[PATCH v7 7/7] KVM: arm64: Zero out the stack initialized data in the FFA handler
Sebastian Ene via OP-TEE <[email protected]> Wed, 17 Jun 2026 14:51:30 +0000
| Newsgroups | org.trustedfirmware.lists.op-tee,dev.linux.lists.kvmarm,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
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. Reported-by: Sashiko AI <[email protected]> Closes: https://lore.kernel.org/all/[email protected]/ Fixes: c9c012625e12 ("KVM: arm64: Trap FFA_VERSION host call in pKVM") Signed-off-by: Sebastian Ene <[email protected]> --- arch/arm64/kvm/hyp/nvhe/ffa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index d7c5701d0584..b321682ead04 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -883,7 +883,7 @@ 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 -- 2.54.0.1136.gdb2ca164c4-goog