From 42aa12e74e91f790d239bfb852260d07573ce83f Mon Sep 17 00:00:00 2001 From: James Hogan Date: Wed, 15 Jun 2016 19:29:57 +0100 Subject: [PATCH] MIPS: KVM: Move commpage so 0x0 is unmapped MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The comm page which is mapped into the guest kernel address space at 0x0 has the unfortunate side effect of allowing guest kernel NULL pointer dereferences to succeed. The only constraint on this address is that it must be within 32KiB of 0x0, so that single lw/sw instructions (which have 16-bit signed offset fields) can be used to access it, using the zero register as a base. So lets move the comm page as high as possible within that constraint so that 0x0 can be left unmapped, at least for page sizes < 32KiB. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini --- arch/mips/include/asm/kvm_host.h | 10 ++++++++-- arch/mips/kvm/commpage.c | 2 +- arch/mips/kvm/dyntrans.c | 4 ++-- arch/mips/kvm/tlb.c | 18 +++++++++--------- 4 files changed, 20 insertions(+), 14 deletions(-) diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 5e9da2a31fde..6c43c782bdfa 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -74,8 +74,14 @@ -/* Special address that contains the comm page, used for reducing # of traps */ -#define KVM_GUEST_COMMPAGE_ADDR 0x0 +/* + * Special address that contains the comm page, used for reducing # of traps + * This needs to be within 32Kb of 0x0 (so the zero register can be used), but + * preferably not at 0x0 so that most kernel NULL pointer dereferences can be + * caught. + */ +#define KVM_GUEST_COMMPAGE_ADDR ((PAGE_SIZE > 0x8000) ? 0 : \ + (0x8000 - PAGE_SIZE)) #define KVM_GUEST_KERNEL_MODE(vcpu) ((kvm_read_c0_guest_status(vcpu->arch.cop0) & (ST0_EXL | ST0_ERL)) || \ ((kvm_read_c0_guest_status(vcpu->arch.cop0) & KSU_USER) == 0)) diff --git a/arch/mips/kvm/commpage.c b/arch/mips/kvm/commpage.c index 2d6e976d1add..a36b77e1705c 100644 --- a/arch/mips/kvm/commpage.c +++ b/arch/mips/kvm/commpage.c @@ -4,7 +4,7 @@ * for more details. * * commpage, currently used for Virtual COP0 registers. - * Mapped into the guest kernel @ 0x0. + * Mapped into the guest kernel @ KVM_GUEST_COMMPAGE_ADDR. * * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. * Authors: Sanjay Lal diff --git a/arch/mips/kvm/dyntrans.c b/arch/mips/kvm/dyntrans.c index a3031dae8d1b..8a1833b9eb38 100644 --- a/arch/mips/kvm/dyntrans.c +++ b/arch/mips/kvm/dyntrans.c @@ -93,7 +93,7 @@ int kvm_mips_trans_mfc0(union mips_instruction inst, u32 *opc, } else { mfc0_inst.i_format.opcode = lw_op; mfc0_inst.i_format.rt = inst.c0r_format.rt; - mfc0_inst.i_format.simmediate = + mfc0_inst.i_format.simmediate = KVM_GUEST_COMMPAGE_ADDR | offsetof(struct kvm_mips_commpage, cop0.reg[rd][sel]); } @@ -111,7 +111,7 @@ int kvm_mips_trans_mtc0(union mips_instruction inst, u32 *opc, mtc0_inst.i_format.opcode = sw_op; mtc0_inst.i_format.rt = inst.c0r_format.rt; - mtc0_inst.i_format.simmediate = + mtc0_inst.i_format.simmediate = KVM_GUEST_COMMPAGE_ADDR | offsetof(struct kvm_mips_commpage, cop0.reg[rd][sel]); return kvm_mips_trans_replace(vcpu, opc, mtc0_inst); diff --git a/arch/mips/kvm/tlb.c b/arch/mips/kvm/tlb.c index 8012e686d4ae..385fbd34e77d 100644 --- a/arch/mips/kvm/tlb.c +++ b/arch/mips/kvm/tlb.c @@ -171,23 +171,23 @@ EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_write); int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, struct kvm_vcpu *vcpu) { - kvm_pfn_t pfn0, pfn1; + kvm_pfn_t pfn; unsigned long flags, old_entryhi = 0, vaddr = 0; - unsigned long entrylo0 = 0, entrylo1 = 0; + unsigned long entrylo[2] = { 0, 0 }; + unsigned int pair_idx; - pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; - pfn1 = 0; - entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | - (0x3 << ENTRYLO_C_SHIFT) | ENTRYLO_D | ENTRYLO_V; - entrylo1 = 0; + pfn = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; + pair_idx = (badvaddr >> PAGE_SHIFT) & 1; + entrylo[pair_idx] = mips3_paddr_to_tlbpfn(pfn << PAGE_SHIFT) | + (0x3 << ENTRYLO_C_SHIFT) | ENTRYLO_D | ENTRYLO_V; local_irq_save(flags); old_entryhi = read_c0_entryhi(); vaddr = badvaddr & (PAGE_MASK << 1); write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu)); - write_c0_entrylo0(entrylo0); - write_c0_entrylo1(entrylo1); + write_c0_entrylo0(entrylo[0]); + write_c0_entrylo1(entrylo[1]); write_c0_index(kvm_mips_get_commpage_asid(vcpu)); mtc0_tlbw_hazard(); tlb_write_indexed();