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authorXiaotian Feng <dfeng@redhat.com>2010-08-13 15:19:11 +0800
committerAvi Kivity <avi@redhat.com>2010-08-15 14:10:15 +0300
commitf45755b8346f1a089ca7957dce5f4c3c6cb26e6f (patch)
treef0b34312371aeaf88fed462857af0630a2c19af8 /fs/dlm
parent3cfc2c42c1cbc8e238bb9c0612c0df4565e3a8b4 (diff)
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KVM: fix poison overwritten caused by using wrong xstate size
fpu.state is allocated from task_xstate_cachep, the size of task_xstate_cachep is xstate_size. xstate_size is set from cpuid instruction, which is often smaller than sizeof(struct xsave_struct). kvm is using sizeof(struct xsave_struct) to fill in/out fpu.state.xsave, as what we allocated for fpu.state is xstate_size, kernel will write out of memory and caused poison/redzone/padding overwritten warnings. Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Reviewed-by: Sheng Yang <sheng@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: Avi Kivity <avi@redhat.com> Cc: Robert Richter <robert.richter@amd.com> Cc: Sheng Yang <sheng@linux.intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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