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authorThomas Huth <thuth@linux.vnet.ibm.com>2013-06-20 17:22:03 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2013-06-20 23:32:13 +0200
commit133608f392ce2e11481317e3d0b02044710a5956 (patch)
treefa39445622a2f114b18e0f1befd641d5aba5d30e /arch/s390
parent93e1750f5ee8417e015bcb0bf2c37bf07b5ff647 (diff)
downloadop-kernel-dev-133608f392ce2e11481317e3d0b02044710a5956.zip
op-kernel-dev-133608f392ce2e11481317e3d0b02044710a5956.tar.gz
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 <thuth@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/priv.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 0b19e22..4b8fb6c 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
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