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

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Message-ID: <CANiq72=xNMKJv3tT9+-jxEOx9033ytRrbUV+TQ6kVL7QY06jDA@mail.gmail.com>
Date:   Fri, 14 Sep 2018 19:12:29 +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

Hi Harshit,

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
>