From: Vasiliy Kulikov <segooon@gmail.com>
Date: Sat, 30 Oct 2010 09:04:24 +0000 (+0400)
Subject: KVM: PPC: fix information leak to userland
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d8cdddcd645766cd4d80fa222226ae6ebfb706af;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

KVM: PPC: fix information leak to userland

Structure kvm_ppc_pvinfo is copied to userland with flags and
pad fields unitialized.  It leads to leaking of contents of
kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 2f87a1627f6c..38f756f25053 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -617,6 +617,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
 	switch (ioctl) {
 	case KVM_PPC_GET_PVINFO: {
 		struct kvm_ppc_pvinfo pvinfo;
+		memset(&pvinfo, 0, sizeof(pvinfo));
 		r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
 		if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
 			r = -EFAULT;