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H A D | guestdbg.c | diff 8c4976772d9b5858b8b456e84783e089c6cfa66e Thu Nov 02 19:15:25 CET 2023 Philipp Stanner <pstanner@redhat.com> KVM: s390: Harden copying of userspace-array against overflow
guestdbg.c utilizes memdup_user() to copy a userspace array. This, currently, does not check for an overflow.
Use the new wrapper memdup_array_user() to copy the array more safely.
Note, KVM explicitly checks the number of entries before duplicating the array, i.e. adding the overflow check should be a glorified nop.
Suggested-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Philipp Stanner <pstanner@redhat.com> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com> Link: https://lore.kernel.org/r/20231102181526.43279-3-pstanner@redhat.com [sean: call out that KVM pre-checks the number of entries] Signed-off-by: Sean Christopherson <seanjc@google.com>
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