This is a note to let you know that I've just added the patch titled crypto: ccp: Use the stack and common buffer for status commands to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: crypto-ccp-use-the-stack-and-common-buffer-for-statu.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 7127a1ef88e7ea3baa2cc56d15610c16002c53e0 Author: Sean Christopherson <seanjc@xxxxxxxxxx> Date: Tue Apr 6 15:49:50 2021 -0700 crypto: ccp: Use the stack and common buffer for status commands [ Upstream commit 38103671aad38e888743dd26c767869cfc15adca ] Drop the dedicated status_cmd_buf and instead use a local variable for PLATFORM_STATUS. Now that the low level helper uses an internal buffer for all commands, using the stack for the upper layers is safe even when running with CONFIG_VMAP_STACK=y. Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> Message-Id: <20210406224952.4177376-7-seanjc@xxxxxxxxxx> Reviewed-by: Brijesh Singh <brijesh.singh@xxxxxxx> Acked-by: Tom Lendacky <thomas.lendacky@xxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Stable-dep-of: 91dfd98216d8 ("crypto: ccp - Avoid page allocation failure warning for SEV_GET_ID2") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 75341ad2fdd8a..1aac3a12a6c7c 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -304,15 +304,14 @@ static int sev_platform_shutdown(int *error) static int sev_get_platform_state(int *state, int *error) { - struct sev_device *sev = psp_master->sev_data; + struct sev_user_data_status data; int rc; - rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, - &sev->status_cmd_buf, error); + rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, error); if (rc) return rc; - *state = sev->status_cmd_buf.state; + *state = data.state; return rc; } @@ -350,15 +349,14 @@ static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable) static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp) { - struct sev_device *sev = psp_master->sev_data; - struct sev_user_data_status *data = &sev->status_cmd_buf; + struct sev_user_data_status data; int ret; - ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error); + ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, &data, &argp->error); if (ret) return ret; - if (copy_to_user((void __user *)argp->data, data, sizeof(*data))) + if (copy_to_user((void __user *)argp->data, &data, sizeof(data))) ret = -EFAULT; return ret; @@ -457,21 +455,20 @@ EXPORT_SYMBOL_GPL(psp_copy_user_blob); static int sev_get_api_version(void) { struct sev_device *sev = psp_master->sev_data; - struct sev_user_data_status *status; + struct sev_user_data_status status; int error = 0, ret; - status = &sev->status_cmd_buf; - ret = sev_platform_status(status, &error); + ret = sev_platform_status(&status, &error); if (ret) { dev_err(sev->dev, "SEV: failed to get status. Error: %#x\n", error); return 1; } - sev->api_major = status->api_major; - sev->api_minor = status->api_minor; - sev->build = status->build; - sev->state = status->state; + sev->api_major = status.api_major; + sev->api_minor = status.api_minor; + sev->build = status.build; + sev->state = status.state; return 0; } diff --git a/drivers/crypto/ccp/sev-dev.h b/drivers/crypto/ccp/sev-dev.h index dd5c4fe82914c..3b0cd0f854df9 100644 --- a/drivers/crypto/ccp/sev-dev.h +++ b/drivers/crypto/ccp/sev-dev.h @@ -46,7 +46,6 @@ struct sev_device { unsigned int int_rcvd; wait_queue_head_t int_queue; struct sev_misc_dev *misc; - struct sev_user_data_status status_cmd_buf; struct sev_data_init init_cmd_buf; u8 api_major;