From: Zhangfei Gao <zhangfei.gao@linaro.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
wangzhou1 <wangzhou1@hisilicon.com>,
linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
kbuild-all@lists.01.org
Subject: Re: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy
Date: Thu, 4 Jun 2020 14:10:37 +0800 [thread overview]
Message-ID: <b6ad8af2-1cb7-faac-0446-5e09e97f3616@linaro.org> (raw)
In-Reply-To: <20200604033918.GA2286@gondor.apana.org.au>
On 2020/6/4 上午11:39, Herbert Xu wrote:
> On Thu, Jun 04, 2020 at 11:32:04AM +0800, Zhangfei Gao wrote:
>> Use strlcpy to fix the warning
>> warning: 'strncpy' specified bound 64 equals destination size
>> [-Wstringop-truncation]
>>
>> Reported-by: kernel test robot <lkp@intel.com>
>> Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
>> ---
>> drivers/crypto/hisilicon/qm.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
>> index f795fb5..224f3e2 100644
>> --- a/drivers/crypto/hisilicon/qm.c
>> +++ b/drivers/crypto/hisilicon/qm.c
>> @@ -1574,7 +1574,7 @@ static int qm_alloc_uacce(struct hisi_qm *qm)
>> .ops = &uacce_qm_ops,
>> };
>>
>> - strncpy(interface.name, pdev->driver->name, sizeof(interface.name));
>> + strlcpy(interface.name, pdev->driver->name, sizeof(interface.name));
> Should this even allow truncation? Perhaps it'd be better to fail
> in case of an overrun?
I think we do not need consider overrun, since it at most copy size-1
bytes to dest.
From the manual: strlcpy()
This function is similar to strncpy(), but it copies at
most size-1 bytes to dest, always adds a terminating null
byte,
And simple tested with smaller SIZE of interface.name, only SIZE-1 is
copied, so it is safe.
-#define UACCE_MAX_NAME_SIZE 64
+#define UACCE_MAX_NAME_SIZE 4
Thanks
next prev parent reply other threads:[~2020-06-04 6:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <202006032110.BEbKqovX%lkp@intel.com>
2020-06-04 3:32 ` [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy Zhangfei Gao
2020-06-04 3:39 ` Herbert Xu
2020-06-04 6:10 ` Zhangfei Gao [this message]
2020-06-04 6:18 ` Herbert Xu
2020-06-04 6:44 ` Zhangfei Gao
2020-06-04 6:50 ` Herbert Xu
2020-06-04 13:52 ` Zhou Wang
2020-06-05 9:34 ` Zhangfei Gao
2020-06-05 12:17 ` Herbert Xu
2020-06-05 15:26 ` Zhangfei Gao
2020-06-05 15:49 ` Eric Biggers
2020-06-06 1:42 ` Zhangfei Gao
2020-06-07 13:03 ` David Laight
2020-06-10 6:56 ` Eric Biggers
2020-06-15 3:38 ` [PATCH v2] crypto: hisilicon - fix strncpy warning with strscpy Zhangfei Gao
2020-06-26 6:06 ` Herbert Xu
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