[PATCH] security: keys: Use kvfree_sensitive in a few places
Alex Dewar
alex.dewar90 at gmail.com
Fri Sep 11 16:09:20 UTC 2020
On 2020-09-11 17:05, Denis Efremov wrote:
> Hi,
>
> same patch
>
> https://lkml.org/lkml/2020/8/27/168
>
> Thanks,
> Denis
Ah ok. Sorry for the noise!
>
> On 9/11/20 2:44 PM, Alex Dewar wrote:
>> In big_key.c, there are a few places where memzero_explicit + kvfree is
>> used. It is better to use kvfree_sensitive instead, which is more
>> readable and also prevents the compiler from eliding the call to
>> memzero_explicit. Fix this.
>>
>> Signed-off-by: Alex Dewar <alex.dewar90 at gmail.com>
>> ---
>> security/keys/big_key.c | 9 +++------
>> 1 file changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/security/keys/big_key.c b/security/keys/big_key.c
>> index 691347dea3c1..d17e5f09eeb8 100644
>> --- a/security/keys/big_key.c
>> +++ b/security/keys/big_key.c
>> @@ -121,8 +121,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
>> *path = file->f_path;
>> path_get(path);
>> fput(file);
>> - memzero_explicit(buf, enclen);
>> - kvfree(buf);
>> + kvfree_sensitive(buf, enclen);
>> } else {
>> /* Just store the data in a buffer */
>> void *data = kmalloc(datalen, GFP_KERNEL);
>> @@ -140,8 +139,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
>> err_enckey:
>> kfree_sensitive(enckey);
>> error:
>> - memzero_explicit(buf, enclen);
>> - kvfree(buf);
>> + kvfree_sensitive(buf, enclen);
>> return ret;
>> }
>>
>> @@ -273,8 +271,7 @@ long big_key_read(const struct key *key, char *buffer, size_t buflen)
>> err_fput:
>> fput(file);
>> error:
>> - memzero_explicit(buf, enclen);
>> - kvfree(buf);
>> + kvfree_sensitive(buf, enclen);
>> } else {
>> ret = datalen;
>> memcpy(buffer, key->payload.data[big_key_data], datalen);
>>
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