This is a note to let you know that I've just added the patch titled
KVM: s390: Fix user triggerable bug in dead code
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-s390-fix-user-triggerable-bug-in-dead-code.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 614a80e474b227cace52fd6e3c790554db8a396e Mon Sep 17 00:00:00 2001
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Date: Wed, 6 Aug 2014 16:17:58 +0200
Subject: KVM: s390: Fix user triggerable bug in dead code
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
commit 614a80e474b227cace52fd6e3c790554db8a396e upstream.
In the early days, we had some special handling for the
KVM_EXIT_S390_SIEIC exit, but this was gone in 2009 with commit
d7b0b5eb3000 (KVM: s390: Make psw available on all exits, not
just a subset).
Now this switch statement is just a sanity check for userspace
not messing with the kvm_run structure. Unfortunately, this
allows userspace to trigger a kernel BUG. Let's just remove
this switch statement.
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kvm/kvm-s390.c | 13 -------------
1 file changed, 13 deletions(-)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1286,19 +1286,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_v
kvm_s390_vcpu_start(vcpu);
- switch (kvm_run->exit_reason) {
- case KVM_EXIT_S390_SIEIC:
- case KVM_EXIT_UNKNOWN:
- case KVM_EXIT_INTR:
- case KVM_EXIT_S390_RESET:
- case KVM_EXIT_S390_UCONTROL:
- case KVM_EXIT_S390_TSCH:
- case KVM_EXIT_DEBUG:
- break;
- default:
- BUG();
- }
-
vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) {
Patches currently in stable-queue which might be from borntraeger@xxxxxxxxxx are
queue-3.16/kvm-s390-fix-user-triggerable-bug-in-dead-code.patch
queue-3.16/kvm-s390-mm-try-a-cow-on-read-only-pages-for-key-ops.patch
queue-3.16/kvm-s390-mm-fix-storage-key-corruption-during-swapping.patch
queue-3.16/kvm-s390-mm-fix-guest-storage-key-corruption-in-ptep_set_access_flags.patch
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