Re: [PATCH] crypto: sun8i-ce: rename kfree() to kfree_sensitive()

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Le 01/03/2021 à 11:30, Yang Li a écrit :
Rename kfree() to kfree_sensitive() to  make the intention of the API
more explicit.

As far as I understand, you are not renaming kfree() to kfree_sensitive().

You are making a change to use kfree_sensitive() instead of using kfree().

Christophe


fixed the following coccicheck:
./drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c:30:16-17: WARNING
opportunity for kfree_sensitive/kvfree_sensitive (memset at line 29)
./drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c:42:16-17: WARNING
opportunity for kfree_sensitive/kvfree_sensitive (memset at line 41)
./drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c:161:8-9: WARNING
opportunity for kfree_sensitive/kvfree_sensitive (memset at line 109)

Reported-by: Abaci Robot <abaci@xxxxxxxxxxxxxxxxx>
Signed-off-by: Yang Li <yang.lee@xxxxxxxxxxxxxxxxx>
---
  drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c
index cfde9ee..8259d52 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c
@@ -27,7 +27,7 @@ void sun8i_ce_prng_exit(struct crypto_tfm *tfm)
  	struct sun8i_ce_rng_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
memzero_explicit(ctx->seed, ctx->slen);
-	kfree(ctx->seed);
+	kfree_sensitive(ctx->seed);
  	ctx->seed = NULL;
  	ctx->slen = 0;
  }
@@ -39,7 +39,7 @@ int sun8i_ce_prng_seed(struct crypto_rng *tfm, const u8 *seed,
if (ctx->seed && ctx->slen != slen) {
  		memzero_explicit(ctx->seed, ctx->slen);
-		kfree(ctx->seed);
+		kfree_sensitive(ctx->seed);
  		ctx->slen = 0;
  		ctx->seed = NULL;
  	}
@@ -158,7 +158,7 @@ int sun8i_ce_prng_generate(struct crypto_rng *tfm, const u8 *src,
  	}
  	memzero_explicit(d, todo);
  err_iv:
-	kfree(d);
+	kfree_sensitive(d);
  err_mem:
  	return err;
  }




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