linux-kernel - [PATCH] crypto: ccp: Fix checks for SNP_VLEK

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Message-ID: <20250728234303.2836702-1-michael.roth@amd.com>
Date: Mon, 28 Jul 2025 18:43:03 -0500
From: Michael Roth <michael.roth@....com>
To: <x86@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>, "Diego
 GonzalezVillalobos" <Diego.GonzalezVillalobos@....com>
Subject: [PATCH] crypto: ccp: Fix checks for SNP_VLEK_LOAD input buffer length

The SNP_VLEK_LOAD IOCTL currently fails due to sev_cmd_buffer_len()
returning the default expected buffer length of 0 instead of the correct
value, which would be sizeof(struct sev_user_data_snp_vlek_load). Add
specific handling for SNP_VLEK_LOAD so the correct expected size is
returned.

Reported-by: Diego GonzalezVillalobos <Diego.GonzalezVillalobos@....com>
Cc: Diego GonzalezVillalobos <Diego.GonzalezVillalobos@....com>
Fixes: 332d2c1d713e ("crypto: ccp: Add the SNP_VLEK_LOAD command")
Signed-off-by: Michael Roth <michael.roth@....com>
---
 drivers/crypto/ccp/sev-dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 3451bada884e..7843973ba4c6 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -233,6 +233,7 @@ static int sev_cmd_buffer_len(int cmd)
 	case SEV_CMD_SNP_GUEST_REQUEST:		return sizeof(struct sev_data_snp_guest_request);
 	case SEV_CMD_SNP_CONFIG:		return sizeof(struct sev_user_data_snp_config);
 	case SEV_CMD_SNP_COMMIT:		return sizeof(struct sev_data_snp_commit);
+	case SEV_CMD_SNP_VLEK_LOAD:		return sizeof(struct sev_user_data_snp_vlek_load);
 	default:				return 0;
 	}
 
-- 
2.25.1