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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>
This commit is contained in:
Thomas Huth 2013-06-20 17:22:03 +02:00 committed by Paolo Bonzini
parent 93e1750f5e
commit 133608f392
1 changed files with 4 additions and 3 deletions
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7
arch/s390/kvm/priv.c
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@ -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