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    Subject[Part2 PATCH v5.1 12.8/31] crypto: ccp: Implement SEV_PEK_CERT_IMPORT ioctl command
    Date
    The SEV_PEK_CERT_IMPORT command can be used to import the signed PEK
    certificate. The command is defined in SEV spec section 5.8.

    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: "Radim Krčmář" <rkrcmar@redhat.com>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: Herbert Xu <herbert@gondor.apana.org.au>
    Cc: Gary Hook <gary.hook@amd.com>
    Cc: Tom Lendacky <thomas.lendacky@amd.com>
    Cc: linux-crypto@vger.kernel.org
    Cc: kvm@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    ---
    drivers/crypto/ccp/psp-dev.c | 97 ++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 97 insertions(+)

    diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
    index 8038ca7aef03..861c44bf2910 100644
    --- a/drivers/crypto/ccp/psp-dev.c
    +++ b/drivers/crypto/ccp/psp-dev.c
    @@ -380,6 +380,99 @@ static int sev_ioctl_pek_csr(struct sev_issue_cmd *argp)
    return ret;
    }

    +static void *copy_user_blob(u64 __user uaddr, u32 len)
    +{
    + void *data;
    +
    + if (!uaddr || !len)
    + return ERR_PTR(-EINVAL);
    +
    + /* verify that blob length does not exceed our limit */
    + if (len > SEV_FW_BLOB_MAX_SIZE)
    + return ERR_PTR(-EINVAL);
    +
    + data = kmalloc(len, GFP_KERNEL);
    + if (!data)
    + return ERR_PTR(-ENOMEM);
    +
    + if (copy_from_user(data, (void __user *)(uintptr_t)uaddr, len))
    + goto e_free;
    +
    + return data;
    +
    +e_free:
    + kfree(data);
    + return ERR_PTR(-EFAULT);
    +}
    +
    +static int sev_ioctl_pek_cert_import(struct sev_issue_cmd *argp)
    +{
    + struct sev_user_data_pek_cert_import input;
    + struct sev_data_pek_cert_import *data;
    + int ret, state, do_shutdown = 0;
    + void *pek_blob, *oca_blob;
    +
    + if (copy_from_user(&input, (void __user *)(uintptr_t) argp->data,
    + sizeof(struct sev_user_data_pek_cert_import)))
    + return -EFAULT;
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL);
    + if (!data)
    + return -ENOMEM;
    +
    + /* copy PEK certificate blobs from userspace */
    + pek_blob = copy_user_blob(input.pek_cert_address, input.pek_cert_len);
    + if (IS_ERR(pek_blob)) {
    + ret = PTR_ERR(pek_blob);
    + goto e_free;
    + }
    +
    + data->pek_cert_address = __psp_pa(pek_blob);
    + data->pek_cert_len = input.pek_cert_len;
    +
    + /* copy PEK certificate blobs from userspace */
    + oca_blob = copy_user_blob(input.oca_cert_address, input.oca_cert_len);
    + if (IS_ERR(oca_blob)) {
    + ret = PTR_ERR(oca_blob);
    + goto e_free_pek;
    + }
    +
    + data->oca_cert_address = __psp_pa(oca_blob);
    + data->oca_cert_len = input.oca_cert_len;
    +
    + ret = sev_platform_get_state(&state, &argp->error);
    + if (ret)
    + goto e_free_oca;
    +
    + /*
    + * PEK_CERT_IMPORT command can be issued only when platform is in INIT
    + * state. If we are in UNINIT state then transition in INIT state
    + * before issuing the command.
    + */
    + if (state == SEV_STATE_WORKING) {
    + ret = -EBUSY;
    + goto e_free_oca;
    + } else if (state == SEV_STATE_UNINIT) {
    + ret = sev_firmware_init(&argp->error);
    + if (ret)
    + goto e_free_oca;
    + do_shutdown = 1;
    + }
    +
    + ret = sev_handle_cmd(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
    +
    + if (do_shutdown)
    + sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
    +
    +e_free_oca:
    + kfree(oca_blob);
    +e_free_pek:
    + kfree(pek_blob);
    +e_free:
    + kfree(data);
    + return ret;
    +}
    +
    static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
    {
    void __user *argp = (void __user *)arg;
    @@ -417,6 +510,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
    ret = sev_ioctl_pek_csr(&input);
    break;
    }
    + case SEV_PEK_CERT_IMPORT: {
    + ret = sev_ioctl_pek_cert_import(&input);
    + break;
    + }
    default:
    ret = -EINVAL;
    break;
    --
    2.9.5
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