KVM: arm: plug potential guest hardware debug leakage

Hardware debugging in guests is not intercepted currently, it means
that a malicious guest can bring down the entire machine by writing
to the debug registers.

This patch enable trapping of all debug registers, preventing the
guests to access the debug registers. This includes access to the
debug mode(DBGDSCR) in the guest world all the time which could
otherwise mess with the host state. Reads return 0 and writes are
ignored (RAZ_WI).

The result is the guest cannot detect any working hardware based debug
support. As debug exceptions are still routed to the guest normal
debug using software based breakpoints still works.

To support debugging using hardware registers we need to implement a
debug register aware world switch as well as special trapping for
registers that may affect the host state.

Cc: stable@vger.kernel.org
Signed-off-by: Zhichao Huang <zhichao.huang@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>

diff --git a/arch/arm/include/asm/kvm_coproc.h b/arch/arm/include/asm/kvm_coproc.h
index 4917c2f7e45955919509727640b9e54edd940b01..e74ab0fbab79091105dd1e5026c1e3e1e1347ead 100644 (file)
--- a/arch/arm/include/asm/kvm_coproc.h
+++ b/arch/arm/include/asm/kvm_coproc.h
@@ -31,7 +31,8 @@ void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table);
 int kvm_handle_cp10_id(struct kvm_vcpu *vcpu, struct kvm_run *run);
 int kvm_handle_cp_0_13_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
 int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run);
-int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
+int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run);
+int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run);
 int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run);
 int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run);
 

diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index ac8d36da4d08fe21c97cadcdcfeaccc44e60cd6c..1403ffb1916bed8824dc2c901c3b59e3734c5ecc 100644 (file)
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -112,12 +112,6 @@ int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run)
        return 1;
 }
 
-int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
-       kvm_inject_undefined(vcpu);
-       return 1;
-}
-
 static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
 {
        /*
@@ -533,12 +527,7 @@ static int emulate_cp15(struct kvm_vcpu *vcpu,
        return 1;
 }
 
-/**
- * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
- * @vcpu: The VCPU pointer
- * @run:  The kvm_run struct
- */
-int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
+static struct coproc_params decode_64bit_hsr(struct kvm_vcpu *vcpu)
 {
        struct coproc_params params;
 
@@ -552,9 +541,38 @@ int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
        params.Rt2 = (kvm_vcpu_get_hsr(vcpu) >> 10) & 0xf;
        params.CRm = 0;
 
+       return params;
+}
+
+/**
+ * kvm_handle_cp15_64 -- handles a mrrc/mcrr trap on a guest CP15 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+       struct coproc_params params = decode_64bit_hsr(vcpu);
+
        return emulate_cp15(vcpu, &params);
 }
 
+/**
+ * kvm_handle_cp14_64 -- handles a mrrc/mcrr trap on a guest CP14 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+       struct coproc_params params = decode_64bit_hsr(vcpu);
+
+       /* raz_wi cp14 */
+       pm_fake(vcpu, &params, NULL);
+
+       /* handled */
+       kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+       return 1;
+}
+
 static void reset_coproc_regs(struct kvm_vcpu *vcpu,
                              const struct coproc_reg *table, size_t num)
 {
@@ -565,12 +583,7 @@ static void reset_coproc_regs(struct kvm_vcpu *vcpu,
                        table[i].reset(vcpu, &table[i]);
 }
 
-/**
- * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
- * @vcpu: The VCPU pointer
- * @run:  The kvm_run struct
- */
-int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
+static struct coproc_params decode_32bit_hsr(struct kvm_vcpu *vcpu)
 {
        struct coproc_params params;
 
@@ -584,9 +597,37 @@ int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
        params.Op2 = (kvm_vcpu_get_hsr(vcpu) >> 17) & 0x7;
        params.Rt2 = 0;
 
+       return params;
+}
+
+/**
+ * kvm_handle_cp15_32 -- handles a mrc/mcr trap on a guest CP15 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+       struct coproc_params params = decode_32bit_hsr(vcpu);
        return emulate_cp15(vcpu, &params);
 }
 
+/**
+ * kvm_handle_cp14_32 -- handles a mrc/mcr trap on a guest CP14 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+       struct coproc_params params = decode_32bit_hsr(vcpu);
+
+       /* raz_wi cp14 */
+       pm_fake(vcpu, &params, NULL);
+
+       /* handled */
+       kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
+       return 1;
+}
+
 /******************************************************************************
  * Userspace API
  *****************************************************************************/

diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index 5fd7968cdae9efb4f68968eca13afebffb8c0be4..f86a9aaef462c6d861a80ae60bb26492ddb28d66 100644 (file)
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -95,9 +95,9 @@ static exit_handle_fn arm_exit_handlers[] = {
        [HSR_EC_WFI]            = kvm_handle_wfx,
        [HSR_EC_CP15_32]        = kvm_handle_cp15_32,
        [HSR_EC_CP15_64]        = kvm_handle_cp15_64,
-       [HSR_EC_CP14_MR]        = kvm_handle_cp14_access,
+       [HSR_EC_CP14_MR]        = kvm_handle_cp14_32,
        [HSR_EC_CP14_LS]        = kvm_handle_cp14_load_store,
-       [HSR_EC_CP14_64]        = kvm_handle_cp14_access,
+       [HSR_EC_CP14_64]        = kvm_handle_cp14_64,
        [HSR_EC_CP_0_13]        = kvm_handle_cp_0_13_access,
        [HSR_EC_CP10_ID]        = kvm_handle_cp10_id,
        [HSR_EC_HVC]            = handle_hvc,

diff --git a/arch/arm/kvm/hyp/switch.c b/arch/arm/kvm/hyp/switch.c
index 92678b7bd046d74b2cb0ad6df34978c3a9e1c112..624a510d31df4095701387da09b4b9a27bd09a17 100644 (file)
--- a/arch/arm/kvm/hyp/switch.c
+++ b/arch/arm/kvm/hyp/switch.c
@@ -48,7 +48,9 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu, u32 *fpexc_host)
        write_sysreg(HSTR_T(15), HSTR);
        write_sysreg(HCPTR_TTA | HCPTR_TCP(10) | HCPTR_TCP(11), HCPTR);
        val = read_sysreg(HDCR);
-       write_sysreg(val | HDCR_TPM | HDCR_TPMCR, HDCR);
+       val |= HDCR_TPM | HDCR_TPMCR; /* trap performance monitors */
+       val |= HDCR_TDRA | HDCR_TDOSA | HDCR_TDA; /* trap debug regs */
+       write_sysreg(val, HDCR);
 }
 
 static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)