crypto: ccp: Implement SEV_PEK_CERT_IMPORT ioctl command
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 Improvements-by: Borislav Petkov <bp@suse.de> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Acked-by: Gary R Hook <gary.hook@amd.com> Reviewed-by: Borislav Petkov <bp@suse.de>
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@ -365,6 +365,84 @@ e_free:
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return ret;
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}
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void *psp_copy_user_blob(u64 __user uaddr, u32 len)
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{
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void *data;
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if (!uaddr || !len)
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return ERR_PTR(-EINVAL);
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/* verify that blob length does not exceed our limit */
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if (len > SEV_FW_BLOB_MAX_SIZE)
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return ERR_PTR(-EINVAL);
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data = kmalloc(len, GFP_KERNEL);
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if (!data)
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return ERR_PTR(-ENOMEM);
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if (copy_from_user(data, (void __user *)(uintptr_t)uaddr, len))
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goto e_free;
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return data;
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e_free:
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kfree(data);
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return ERR_PTR(-EFAULT);
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}
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EXPORT_SYMBOL_GPL(psp_copy_user_blob);
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static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp)
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{
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struct sev_user_data_pek_cert_import input;
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struct sev_data_pek_cert_import *data;
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void *pek_blob, *oca_blob;
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int ret;
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if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
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return -EFAULT;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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/* copy PEK certificate blobs from userspace */
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pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
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if (IS_ERR(pek_blob)) {
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ret = PTR_ERR(pek_blob);
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goto e_free;
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}
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data->pek_cert_address = __psp_pa(pek_blob);
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data->pek_cert_len = input.pek_cert_len;
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/* copy PEK certificate blobs from userspace */
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oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
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if (IS_ERR(oca_blob)) {
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ret = PTR_ERR(oca_blob);
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goto e_free_pek;
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}
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data->oca_cert_address = __psp_pa(oca_blob);
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data->oca_cert_len = input.oca_cert_len;
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/* If platform is not in INIT state then transition it to INIT */
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if (psp_master->sev_state != SEV_STATE_INIT) {
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ret = __sev_platform_init_locked(&argp->error);
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if (ret)
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goto e_free_oca;
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}
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ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
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e_free_oca:
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kfree(oca_blob);
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e_free_pek:
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kfree(pek_blob);
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e_free:
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kfree(data);
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return ret;
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}
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static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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@ -402,6 +480,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
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case SEV_PEK_CSR:
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ret = sev_ioctl_do_pek_csr(&input);
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break;
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case SEV_PEK_CERT_IMPORT:
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ret = sev_ioctl_do_pek_import(&input);
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break;
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default:
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ret = -EINVAL;
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goto out;
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@ -576,6 +576,8 @@ int sev_guest_df_flush(int *error);
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*/
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int sev_guest_decommission(struct sev_data_decommission *data, int *error);
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void *psp_copy_user_blob(u64 __user uaddr, u32 len);
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#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
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static inline int
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@ -597,6 +599,8 @@ static inline int sev_guest_df_flush(int *error) { return -ENODEV; }
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static inline int
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sev_issue_cmd_external_user(struct file *filep, unsigned int id, void *data, int *error) { return -ENODEV; }
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static inline void *psp_copy_user_blob(u64 __user uaddr, u32 len) { return ERR_PTR(-EINVAL); }
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#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
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#endif /* __PSP_SEV_H__ */
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