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From: Waiman Long <longman@redhat.com>
To: Christophe Leroy <christophe.leroy@c-s.fr>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Howells <dhowells@redhat.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	James Morris <jmorris@namei.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Joe Perches <joe@perches.com>,
	Matthew Wilcox <willy@infradead.org>,
	David Rientjes <rientjes@google.com>
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Subject: Re: [PATCH v2 2/2] crypto: Remove unnecessary memzero_explicit()
Date: Tue, 14 Apr 2020 12:24:36 -0400
Message-ID: <e194a51f-a5e5-a557-c008-b08cac558572@redhat.com> (raw)
In-Reply-To: <eca85e0b-0af3-c43a-31e4-bd5c3f519798@c-s.fr>

On 4/14/20 2:08 AM, Christophe Leroy wrote:
>
>
> Le 14/04/2020 à 00:28, Waiman Long a écrit :
>> Since kfree_sensitive() will do an implicit memzero_explicit(), there
>> is no need to call memzero_explicit() before it. Eliminate those
>> memzero_explicit() and simplify the call sites. For better correctness,
>> the setting of keylen is also moved down after the key pointer check.
>>
>> Signed-off-by: Waiman Long <longman@redhat.com>
>> ---
>>   .../allwinner/sun8i-ce/sun8i-ce-cipher.c      | 19 +++++-------------
>>   .../allwinner/sun8i-ss/sun8i-ss-cipher.c      | 20 +++++--------------
>>   drivers/crypto/amlogic/amlogic-gxl-cipher.c   | 12 +++--------
>>   drivers/crypto/inside-secure/safexcel_hash.c  |  3 +--
>>   4 files changed, 14 insertions(+), 40 deletions(-)
>>
>> diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
>> b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
>> index aa4e8fdc2b32..8358fac98719 100644
>> --- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
>> +++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
>> @@ -366,10 +366,7 @@ void sun8i_ce_cipher_exit(struct crypto_tfm *tfm)
>>   {
>>       struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
>>   -    if (op->key) {
>> -        memzero_explicit(op->key, op->keylen);
>> -        kfree(op->key);
>> -    }
>> +    kfree_sensitive(op->key);
>>       crypto_free_sync_skcipher(op->fallback_tfm);
>>       pm_runtime_put_sync_suspend(op->ce->dev);
>>   }
>> @@ -391,14 +388,11 @@ int sun8i_ce_aes_setkey(struct crypto_skcipher
>> *tfm, const u8 *key,
>>           dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
>>           return -EINVAL;
>>       }
>> -    if (op->key) {
>> -        memzero_explicit(op->key, op->keylen);
>> -        kfree(op->key);
>> -    }
>> -    op->keylen = keylen;
>> +    kfree_sensitive(op->key);
>>       op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
>>       if (!op->key)
>>           return -ENOMEM;
>> +    op->keylen = keylen;
>
> Does it matter at all to ensure op->keylen is not set when of->key is
> NULL ? I'm not sure.
>
> But if it does, then op->keylen should be set to 0 when freeing op->key. 

My thinking is that if memory allocation fails, we just don't touch
anything and return an error code. I will not explicitly set keylen to 0
in this case unless it is specified in the API documentation.

Cheers,
Longman


  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-13 21:15 [PATCH 0/2] mm, treewide: Rename kzfree() to kfree_sensitive() Waiman Long
2020-04-13 21:15 ` [PATCH 1/2] " Waiman Long
2020-04-14  0:29   ` David Rientjes
2020-04-14  8:32   ` Jason A. Donenfeld
2020-04-14  9:01   ` Michal Hocko
2020-04-14 12:48   ` David Sterba
2020-04-14 18:26     ` Waiman Long
2020-04-15  5:01   ` Johannes Weiner
2020-04-13 21:15 ` [PATCH 2/2] crypto: Remove unnecessary memzero_explicit() Waiman Long
2020-04-13 21:31   ` Joe Perches
2020-04-13 21:52     ` Waiman Long
2020-04-13 22:28 ` [PATCH v2 " Waiman Long
2020-04-14  6:08   ` Christophe Leroy
2020-04-14 16:24     ` Waiman Long [this message]
2020-04-14 19:16       ` Michal Suchánek
2020-04-14 19:37         ` Waiman Long
2020-04-14 19:44           ` Joe Perches
2020-04-14 13:06 ` [PATCH 1/2] mm, treewide: Rename kzfree() to kfree_sensitive() David Howells

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