[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v02 6/7] arm: introduce do_translate_pagetable hypercall
Hi Andrii, On 26/06/14 12:07, Andrii Tseglytskyi wrote: +long do_translate_pagetable(int cmd, XEN_GUEST_HANDLE_PARAM(xen_pagetable_addr_t) pgt_addr) +{ + struct xen_pagetable_addr pgt; + struct mmu_info *mmu = NULL; + + if ( copy_from_guest(&pgt, pgt_addr, 1) ) + return -EFAULT; + + mmu = mmu_lookup(pgt.reg); + if ( !mmu ) + { + pr_mmu("can't get mmu for addr 0x%08x", pgt.reg); + return -EINVAL; + } + + pgt.maddr = mmu_translate_pagetable(mmu, pgt.paddr); + + return copy_to_guest(pgt_addr, &pgt, 1); +} + AFAIU, nothing prevents a malicious guest to call this hypercall and screw the pagetable of the MMU. Regards, -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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