From 6a83830f649a614aca445bbcadbd582c7929e63d Mon Sep 17 00:00:00 2001 From: Nikolaus Voss Date: Mon, 21 Nov 2022 15:12:41 +0100 Subject: crypto: caam - warn if blob_gen key is insecure If CAAM is not in "trusted" or "secure" state, a fixed non-volatile key is used instead of the unique device key. This is the default mode of operation without secure boot (HAB). In this scenario, CAAM encrypted blobs should be used only for testing but not in a production environment, so issue a warning. Signed-off-by: Nikolaus Voss Reviewed-by: Ahmad Fatoum Signed-off-by: Herbert Xu --- drivers/crypto/caam/blob_gen.c | 9 +++++++++ drivers/crypto/caam/regs.h | 3 +++ 2 files changed, 12 insertions(+) diff --git a/drivers/crypto/caam/blob_gen.c b/drivers/crypto/caam/blob_gen.c index 6345c7269eb0..1f65df489847 100644 --- a/drivers/crypto/caam/blob_gen.c +++ b/drivers/crypto/caam/blob_gen.c @@ -6,6 +6,7 @@ #define pr_fmt(fmt) "caam blob_gen: " fmt +#include #include #include @@ -61,12 +62,14 @@ static void caam_blob_job_done(struct device *dev, u32 *desc, u32 err, void *con int caam_process_blob(struct caam_blob_priv *priv, struct caam_blob_info *info, bool encap) { + const struct caam_drv_private *ctrlpriv; struct caam_blob_job_result testres; struct device *jrdev = &priv->jrdev; dma_addr_t dma_in, dma_out; int op = OP_PCLID_BLOB; size_t output_len; u32 *desc; + u32 moo; int ret; if (info->key_mod_len > CAAM_BLOB_KEYMOD_LENGTH) @@ -100,6 +103,12 @@ int caam_process_blob(struct caam_blob_priv *priv, goto out_unmap_in; } + ctrlpriv = dev_get_drvdata(jrdev->parent); + moo = FIELD_GET(CSTA_MOO, ioread32(&ctrlpriv->ctrl->perfmon.status)); + if (moo != CSTA_MOO_SECURE && moo != CSTA_MOO_TRUSTED) + dev_warn(jrdev, + "using insecure test key, enable HAB to use unique device key!\n"); + /* * A data blob is encrypted using a blob key (BK); a random number. * The BK is used as an AES-CCM key. The initial block (B0) and the diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h index 66d6dad841bb..66928f8a0c4b 100644 --- a/drivers/crypto/caam/regs.h +++ b/drivers/crypto/caam/regs.h @@ -426,6 +426,9 @@ struct caam_perfmon { u32 rsvd2; #define CSTA_PLEND BIT(10) #define CSTA_ALT_PLEND BIT(18) +#define CSTA_MOO GENMASK(9, 8) +#define CSTA_MOO_SECURE 1 +#define CSTA_MOO_TRUSTED 2 u32 status; /* CSTA - CAAM Status */ u64 rsvd3; -- cgit v1.2.3