[Part2 PATCH v6 14/38] crypto: ccp: Implement SEV_FACTORY_RESET ioctl command
From: Brijesh Singh <hidden>
Date: 2017-10-20 02:43:41
Also in:
linux-crypto, lkml
Subsystem:
amd cryptographic coprocessor (ccp) driver, crypto api, the rest · Maintainers:
Tom Lendacky, John Allen, Herbert Xu, "David S. Miller", Linus Torvalds
The SEV_FACTORY_RESET command can be used by the platform owner to reset the non-volatile SEV related data. The command is defined in SEV spec section 5.4 Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <redacted> Cc: Borislav Petkov <redacted> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Gary Hook <redacted> 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 [off-list ref] Signed-off-by: Brijesh Singh <redacted> --- drivers/crypto/ccp/psp-dev.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index e9966d5fc6c4..99f3761206da 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c@@ -176,7 +176,33 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret) static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) { - return -ENOTTY; + void __user *argp = (void __user *)arg; + struct sev_issue_cmd input; + int ret = -EFAULT; + + if (ioctl != SEV_ISSUE_CMD) + return -EINVAL; + + if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) + return -EFAULT; + + if (input.cmd > SEV_MAX) + return -EINVAL; + + switch (input.cmd) { + + case SEV_FACTORY_RESET: + ret = sev_do_cmd(SEV_CMD_FACTORY_RESET, 0, &input.error); + break; + default: + ret = -EINVAL; + goto out; + } + + if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) + ret = -EFAULT; +out: + return ret; } static const struct file_operations sev_fops = {
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2.9.5