linux-kernel - Re: [PATCH] scripts: unifdef: fix stringop-truncation warning

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Date:   Fri, 14 Sep 2018 19:18:18 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Harshit Jain <harshitjain6751@...il.com>
Cc:     stable@...r.kernel.org, Harshit Jain <dev-harsh1998@...mail.com>,
        Tony Finch <dot@...at.at>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scripts: unifdef: fix stringop-truncation warning

On Fri, Sep 14, 2018 at 7:12 PM, Miguel Ojeda
<miguel.ojeda.sandonis@...il.com> wrote:
> Hi Harshit,

Another two nitpicks:

  * Since this is the second version of the patch, write "[PATCH v2]"
in the title instead; that way people know you have sent an earlier
version. On top of that, you should explain the differences between
each version after the "---" line (i.e. the part that does not belong
to the commit message).

  * You may want to write down who you CC'd (e.g. Tony and the stable
mailing list) in "Cc: ..." lines before the Signed-off-by line.

Thanks for the patch!

Hope that helps,
Miguel

>
> On Fri, Sep 14, 2018 at 12:44 PM, Harshit Jain
> <harshitjain6751@...il.com> wrote:
>> From: Harshit Jain <dev-harsh1998@...mail.com>
>>
>> * This commit resolves the following warning when the mainline kernel is build with the android environment.
>
> Typo: built
>
>>
>> -> warning :-> https://gist.github.com/dev-harsh1998/757427b16a58f5498db3d87212a9651b
>
> Try to avoid links to external pages (specially if they are only 2 lines :-).
>
>>
>> * This warning is persistant in all the currently maintained android kernel i.e 3.18, 4.4, 4.9, 4.14.
>
> Typos: persistent, kernels, i.e.
>
>>
>> Signed-off-by: Harshit Jain <dev-harsh1998@...mail.com>
>> ---
>>  scripts/unifdef.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/scripts/unifdef.c b/scripts/unifdef.c
>> index 7493c0ee51cc..4ce008eda362 100644
>> --- a/scripts/unifdef.c
>> +++ b/scripts/unifdef.c
>> @@ -395,8 +395,8 @@ usage(void)
>>   * When we have processed a group that starts off with a known-false
>>   * #if/#elif sequence (which has therefore been deleted) followed by a
>>   * #elif that we don't understand and therefore must keep, we edit the
>> - * latter into a #if to keep the nesting correct. We use strncpy() to
>> - * overwrite the 4 byte token "elif" with "if  " without a '\0' byte.
>> + * latter into a #if to keep the nesting correct. We use the memcpy()
>> + * from the string header overwrite the 4 byte token "elif" with "if  ".
>>   *
>>   * When we find a true #elif in a group, the following block will
>>   * always be kept and the rest of the sequence after the next #elif or
>> @@ -450,7 +450,7 @@ static void Idrop (void) { Fdrop();  ignoreon(); }
>>  static void Itrue (void) { Ftrue();  ignoreon(); }
>>  static void Ifalse(void) { Ffalse(); ignoreon(); }
>>  /* modify this line */
>> -static void Mpass (void) { strncpy(keyword, "if  ", 4); Pelif(); }
>> +static void Mpass (void) { memcpy(keyword, "if  ", 4); Pelif(); }
>
> Seems like keyword shouldn't use __attribute__((nonstring)), so this
> looks right.
>
> Cheers,
> Miguel
>
>>  static void Mtrue (void) { keywordedit("else");  state(IS_TRUE_MIDDLE); }
>>  static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
>>  static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }
>> --
>> 2.18.0
>>