linux-kernel - [patch v2] crypto: ccp - Fix SEV_VERSION_GREATER_OR

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Message-ID: <alpine.DEB.2.21.1907121341210.37390@chino.kir.corp.google.com>
Date:   Fri, 12 Jul 2019 13:41:58 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
cc:     "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        Cfir Cohen <cfir@...gle.com>,
        "Natarajan, Janakarajan" <Janakarajan.Natarajan@....com>,
        "Hook, Gary" <Gary.Hook@....com>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [patch v2] crypto: ccp - Fix SEV_VERSION_GREATER_OR_EQUAL

SEV_VERSION_GREATER_OR_EQUAL() will fail if upgrading from 2.2 to 3.1, for
example, because the minor version is not equal to or greater than the
major.

Fix this and move to a static inline function for appropriate type
checking.

Fixes: edd303ff0e9e ("crypto: ccp - Add DOWNLOAD_FIRMWARE SEV command")
Reported-by: Cfir Cohen <cfir@...gle.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 v2: no need to check api_major >= maj after checking api_major > maj
     per Thomas

 drivers/crypto/ccp/psp-dev.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -24,10 +24,6 @@
 #include "sp-dev.h"
 #include "psp-dev.h"
 
-#define SEV_VERSION_GREATER_OR_EQUAL(_maj, _min)	\
-		((psp_master->api_major) >= _maj &&	\
-		 (psp_master->api_minor) >= _min)
-
 #define DEVICE_NAME		"sev"
 #define SEV_FW_FILE		"amd/sev.fw"
 #define SEV_FW_NAME_SIZE	64
@@ -47,6 +43,15 @@ MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during
 static bool psp_dead;
 static int psp_timeout;
 
+static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
+{
+	if (psp_master->api_major > maj)
+		return true;
+	if (psp_master->api_major == maj && psp_master->api_minor >= min)
+		return true;
+	return false;
+}
+
 static struct psp_device *psp_alloc_struct(struct sp_device *sp)
 {
 	struct device *dev = sp->dev;
@@ -588,7 +593,7 @@ static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
 	int ret;
 
 	/* SEV GET_ID is available from SEV API v0.16 and up */
-	if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
+	if (!sev_version_greater_or_equal(0, 16))
 		return -ENOTSUPP;
 
 	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
@@ -651,7 +656,7 @@ static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
 	int ret;
 
 	/* SEV GET_ID available from SEV API v0.16 and up */
-	if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
+	if (!sev_version_greater_or_equal(0, 16))
 		return -ENOTSUPP;
 
 	/* SEV FW expects the buffer it fills with the ID to be
@@ -1053,7 +1058,7 @@ void psp_pci_init(void)
 		psp_master->sev_state = SEV_STATE_UNINIT;
 	}
 
-	if (SEV_VERSION_GREATER_OR_EQUAL(0, 15) &&
+	if (sev_version_greater_or_equal(0, 15) &&
 	    sev_update_firmware(psp_master->dev) == 0)
 		sev_get_api_version();