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Revert "HV: clear memory region used by UOS before it exit"

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This reverts commit cf7a94071b.
This commit is contained in:
Zhang, wenling 2018-08-01 11:32:31 -04:00
parent 9c24c5c85d
commit cf8fd8cfbc
1 changed files with 0 additions and 14 deletions
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14
devicemodel/core/vmmapi.c
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@ -339,20 +339,6 @@ vm_setup_memory(struct vmctx *ctx, size_t memsize)
void void
vm_unsetup_memory(struct vmctx *ctx) vm_unsetup_memory(struct vmctx *ctx)
{ {
/*
* For security reason, clean the VM's memory region
* to avoid secret information leaking in below case:
* After a UOS is destroyed, the memory will be reclaimed,
* then if the new UOS starts, that memory region may be
* allocated the new UOS, the previous UOS sensitive data
* may be leaked to the new UOS if the memory is not cleared.
*
*/
bzero((void *)ctx->baseaddr, ctx->lowmem);
if (ctx->highmem > 0) {
bzero((void *)(ctx->baseaddr + 4 * GB), ctx->highmem);
}
hugetlb_unsetup_memory(ctx); hugetlb_unsetup_memory(ctx);
} }