linux-kernel - Re: [PATCH 2/5] scsi: bfa: bfa_fcs_lport.c: Cleaning up missing null-terminate by switching from strncpy to strzcpy

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Message-ID: <CAFo99gYAcfa47CLkQWLs7V8gTEOZfSOSXmjVC_3j_8Ugw4xk4w@mail.gmail.com>
Date:	Mon, 20 Oct 2014 23:10:09 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Anil Gurumurthy <anil.gurumurthy@...gic.com>,
	Sudarsana Kalluru <sudarsana.kalluru@...gic.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 2/5] scsi: bfa: bfa_fcs_lport.c: Cleaning up missing
 null-terminate by switching from strncpy to strzcpy

2014-10-20 17:37 GMT+02:00 Dan Carpenter <dan.carpenter@...cle.com>:
> On Sun, Oct 19, 2014 at 12:13:10AM +0200, Rickard Strandqvist wrote:
>> Ensures that the string is null-terminate in connection with the
>> use of strncpy, by switching from strncpy to strzcpy.
>>
>
> I wish the changelogs were more clear that we have no reason to think
> this is a real issue.
>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
>> ---
>>  drivers/scsi/bfa/bfa_fcs_lport.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/scsi/bfa/bfa_fcs_lport.c b/drivers/scsi/bfa/bfa_fcs_lport.c
>> index ff75ef8..78af89e 100644
>> --- a/drivers/scsi/bfa/bfa_fcs_lport.c
>> +++ b/drivers/scsi/bfa/bfa_fcs_lport.c
>> @@ -2633,7 +2633,7 @@ bfa_fcs_fdmi_get_hbaattr(struct bfa_fcs_lport_fdmi_s *fdmi,
>>       strncpy(hba_attr->driver_version, (char *)driver_info->version,
>>               sizeof(hba_attr->driver_version));
>
> Why do we not change this one?
>
>>
>> -     strncpy(hba_attr->os_name, driver_info->host_os_name,
>> +     strzcpy(hba_attr->os_name, driver_info->host_os_name,
>>               sizeof(hba_attr->os_name));
>
> strlcpy() would also be totally safe here.  It's also safe for patch
> patch 3 and patch 4.  Patch 5 is trickier to audit so I don't know if
> strlcpy() is safe.


Hi Dan

It was a miss, should have done this on both strncpy.

After becoming quite attacked for having changed to strlcpy I am very
careful with it now.
But ok, then I submit 2 3 4 with strlcpy instead.

But this is a little bad example for strzcpy though :-(

Kind regards
Rickard Strandqvist
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