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Wed, 17 Jun 2026 07:51:52 -0700 (PDT) Date: Wed, 17 Jun 2026 14:51:30 +0000 In-Reply-To: <20260617145130.3729015-1-sebastianene@google.com> Mime-Version: 1.0 References: <20260617145130.3729015-1-sebastianene@google.com> X-Mailer: git-send-email 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260617145130.3729015-8-sebastianene@google.com> Subject: [PATCH v7 7/7] KVM: arm64: Zero out the stack initialized data in the FFA handler From: Sebastian Ene To: catalin.marinas@arm.com, oupton@kernel.org, sudeep.holla@kernel.org, will@kernel.org Cc: jens.wiklander@linaro.org, joey.gouly@arm.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, android-kvm@google.com, maz@kernel.org, mrigendra.chaubey@gmail.com, op-tee@lists.trustedfirmware.org, perlarsen@google.com, sebastianene@google.com, seiden@linux.ibm.com, smostafa@google.com, sumit.garg@kernel.org, suzuki.poulose@arm.com, vdonnefort@google.com, yuzenghui@huawei.com, Sashiko AI Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260617_075155_839535_C86B6015 X-CRM114-Status: GOOD ( 12.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 Closes: https://lore.kernel.org/all/20260616160016.C62C81F000E9@smtp.kernel.org/ Fixes: c9c012625e12 ("KVM: arm64: Trap FFA_VERSION host call in pKVM") Signed-off-by: Sebastian Ene --- 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