From: Thomas Huth Date: Thu, 20 Jun 2013 15:22:03 +0000 (+0200) Subject: KVM: s390: Check for access exceptions during TPI X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=133608f392ce2e11481317e3d0b02044710a5956;p=linux-beck.git KVM: s390: Check for access exceptions during TPI When a guest calls the TPI instruction, the second operand address could point to an invalid location. In this case the problem should be signaled to the guest by throwing an access exception. Signed-off-by: Thomas Huth Acked-by: Cornelia Huck Signed-off-by: Cornelia Huck Signed-off-by: Paolo Bonzini --- diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 0b19e2226955..4b8fb6cc3c45 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -146,9 +146,10 @@ static int handle_tpi(struct kvm_vcpu *vcpu) * Store the two-word I/O interruption code into the * provided area. */ - put_guest(vcpu, inti->io.subchannel_id, (u16 __user *) addr); - put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *) (addr + 2)); - put_guest(vcpu, inti->io.io_int_parm, (u32 __user *) (addr + 4)); + if (put_guest(vcpu, inti->io.subchannel_id, (u16 __user *)addr) + || put_guest(vcpu, inti->io.subchannel_nr, (u16 __user *)(addr + 2)) + || put_guest(vcpu, inti->io.io_int_parm, (u32 __user *)(addr + 4))) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); } else { /* * Store the three-word I/O interruption code into