linux-kernel - Re: [PATCH linux-next] perf annotate: use strscpy() is more robust and safer

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Message-ID: <Yyy1JgWCuQTMKFkY@kernel.org>
Date:   Thu, 22 Sep 2022 20:19:02 +0100
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     cgel.zte@...il.com
Cc:     mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, irogers@...gle.com, songliubraving@...com,
        adrian.hunter@...el.com, davemarchevsky@...com, wcohen@...hat.com,
        andres@...razel.de, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, ye xingchen <ye.xingchen@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] perf annotate: use strscpy() is more robust
 and safer

Em Thu, Sep 22, 2022 at 01:24:31AM +0000, cgel.zte@...il.com escreveu:
> From: ye xingchen <ye.xingchen@....com.cn>
> 
> The implementation of strscpy() is more robust and safer.

Where is strscpy() defined?

I see it defined in the kernel:

⬢[acme@...lbox perf]$ grep -w strscpy include/linux/string.h
ssize_t strscpy(char *, const char *, size_t);
/* Wraps calls to strscpy()/memset(), no arch specific code required */
⬢[acme@...lbox perf]$

But not in tools/

Have you actually build with these patches?

- Arnaldo
 
> That's now the recommended way to copy NUL terminated strings.
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
> ---
>  tools/perf/util/annotate.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 5bc63c9e0324..e2b038b14ff6 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -1702,7 +1702,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
>  			char *new_name = filename_with_chroot(dso->nsinfo->pid,
>  							      filename);
>  			if (new_name) {
> -				strlcpy(filename, new_name, filename_size);
> +				strscpy(filename, new_name, filename_size);
>  				free(new_name);
>  			}
>  		}
> @@ -2002,7 +2002,7 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
>  		kce.len = sym->end - sym->start;
>  		if (!kcore_extract__create(&kce)) {
>  			delete_extract = true;
> -			strlcpy(symfs_filename, kce.extract_filename,
> +			strscpy(symfs_filename, kce.extract_filename,
>  				sizeof(symfs_filename));
>  		}
>  	} else if (dso__needs_decompress(dso)) {
> -- 
> 2.25.1

-- 

- Arnaldo