lkml.org 
[lkml]   [2018]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.14 136/195] arm: KVM: Fix SMCCC handling of unimplemented SMC/HVC calls
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Marc Zyngier <marc.zyngier@arm.com>

    commit 20e8175d246e9f9deb377f2784b3e7dfb2ad3e86 upstream.

    KVM doesn't follow the SMCCC when it comes to unimplemented calls,
    and inject an UNDEF instead of returning an error. Since firmware
    calls are now used for security mitigation, they are becoming more
    common, and the undef is counter productive.

    Instead, let's follow the SMCCC which states that -1 must be returned
    to the caller when getting an unknown function number.

    Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    arch/arm/kvm/handle_exit.c | 13 +++++++++++--
    1 file changed, 11 insertions(+), 2 deletions(-)

    --- a/arch/arm/kvm/handle_exit.c
    +++ b/arch/arm/kvm/handle_exit.c
    @@ -38,7 +38,7 @@ static int handle_hvc(struct kvm_vcpu *v

    ret = kvm_hvc_call_handler(vcpu);
    if (ret < 0) {
    - kvm_inject_undefined(vcpu);
    + vcpu_set_reg(vcpu, 0, ~0UL);
    return 1;
    }

    @@ -47,7 +47,16 @@ static int handle_hvc(struct kvm_vcpu *v

    static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
    {
    - kvm_inject_undefined(vcpu);
    + /*
    + * "If an SMC instruction executed at Non-secure EL1 is
    + * trapped to EL2 because HCR_EL2.TSC is 1, the exception is a
    + * Trap exception, not a Secure Monitor Call exception [...]"
    + *
    + * We need to advance the PC after the trap, as it would
    + * otherwise return to the same address...
    + */
    + vcpu_set_reg(vcpu, 0, ~0UL);
    + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
    return 1;
    }


    \
     
     \ /
      Last update: 2018-02-15 18:20    [W:4.046 / U:0.064 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site