1. 14 Sep, 2014 1 commit
  2. 03 Sep, 2014 1 commit
    • Laurent Dufour's avatar
      powerpc/kvm/cma: Fix panic introduces by signed shift operation · 02a68d05
      Laurent Dufour authored
      fc95ca72 introduces a memset in
      kvmppc_alloc_hpt since the general CMA doesn't clear the memory it
      allocates.
      
      However, the size argument passed to memset is computed from a signed value
      and its signed bit is extended by the cast the compiler is doing. This lead
      to extremely large size value when dealing with order value >= 31, and
      almost all the memory following the allocated space is cleaned. As a
      consequence, the system is panicing and may even fail spawning the kdump
      kernel.
      
      This fix makes use of an unsigned value for the memset's size argument to
      avoid sign extension. Among this fix, another shift operation which may
      lead to signed extended value too is also fixed.
      
      Cc: Alexey Kardashevskiy <aik@ozlabs.ru>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Alexander Graf <agraf@suse.de>
      Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      02a68d05
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