linux

iv/linux

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Claudio Imbrenda d4074324b0 KVM: s390: pv: avoid double free of sida page

If kvm_s390_pv_destroy_cpu is called more than once, we risk calling
free_page on a random page, since the sidad field is aliased with the
gbea, which is not guaranteed to be zero.

This can happen, for example, if userspace calls the KVM_PV_DISABLE
IOCTL, and it fails, and then userspace calls the same IOCTL again.
This scenario is only possible if KVM has some serious bug or if the
hardware is broken.

The solution is to simply return successfully immediately if the vCPU
was already non secure.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Fixes: 19e1227768863a1469797c13ef8fea1af7beac2c ("KVM: S390: protvirt: Introduce instruction data area bounce buffer")
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <20210920132502.36111-3-imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

2021-10-25 09:20:38 +02:00

appldata

s390/appldata: use struct_size() helper

2020-06-29 16:32:34 +02:00

boot

Kbuild updates for v5.15

2021-09-03 15:33:47 -07:00

configs

s390: update defconfigs

2021-09-15 14:29:21 +02:00

crypto

s390/archrandom: add parameter check for s390_arch_random_generate