linux-kernel - Re: [PATCH 18/18] cpupower: change strncpy+truncation to strlcpy

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Date:   Tue, 14 Aug 2018 10:45:02 -0500
From:   Daniel Díaz <daniel.diaz@...aro.org>
To:     Dominique Martinet <asmadeus@...ewreck.org>
Cc:     Thomas Renninger <trenn@...e.com>, Shuah Khan <shuah@...nel.org>,
        Colin Ian King <colin.king@...onical.com>,
        linux-pm@...r.kernel.org, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 18/18] cpupower: change strncpy+truncation to strlcpy

Hello!


On 12 July 2018 at 20:26, Dominique Martinet <asmadeus@...ewreck.org> wrote:
> Generated by scripts/coccinelle/misc/strncpy_truncation.cocci
>
> Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
> ---
>
> Please see https://marc.info/?l=linux-kernel&m=153144450722324&w=2 (the
> first patch of the serie) for the motivation behind this patch
>
>  tools/power/cpupower/bench/parse.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/tools/power/cpupower/bench/parse.c b/tools/power/cpupower/bench/parse.c
> index 9ba8a44ad2a7..1566b89989b2 100644
> --- a/tools/power/cpupower/bench/parse.c
> +++ b/tools/power/cpupower/bench/parse.c
> @@ -221,9 +221,8 @@ int prepare_config(const char *path, struct config *config)
>                         sscanf(val, "%u", &config->cpu);
>
>                 else if (strcmp("governor", opt) == 0) {
> -                       strncpy(config->governor, val,
> +                       strlcpy(config->governor, val,
>                                         sizeof(config->governor));
> -                       config->governor[sizeof(config->governor) - 1] = '\0';
>                 }
>
>                 else if (strcmp("priority", opt) == 0) {
> --
> 2.17.1

I can't get cpupower to compile anymore now that it made its way to linux-next:
  [/linux/tools/power/cpupower]$ make
    CC       lib/cpufreq.o
  [...]
  make[1]: Entering directory '/linux/tools/power/cpupower/bench'
    CC       main.o
    CC       parse.o
  parse.c: In function ‘prepare_config’:
  parse.c:224:4: warning: implicit declaration of function ‘strlcpy’
[-Wimplicit-function-declaration]
      strlcpy(config->governor, val,
      ^
    CC       system.o
    CC       benchmark.o
    CC       cpufreq-bench
  .//parse.o: In function `prepare_config':
  /linux/tools/power/cpupower/bench/parse.c:224: undefined reference
to `strlcpy'
  collect2: error: ld returned 1 exit status
  Makefile:25: recipe for target 'cpufreq-bench' failed
  make[1]: *** [cpufreq-bench] Error 1
  make[1]: Leaving directory '/linux/tools/power/cpupower/bench'
  Makefile:258: recipe for target 'compile-bench' failed
  make: *** [compile-bench] Error 2

Does it need anything special to make?

Greetings!

Daniel Díaz
daniel.diaz@...aro.org