[PATCH v1] elf: Replace `strcpy` call with `memcpy` [BZ #29454]

[H.J. Lu]

On Sun, Aug 7, 2022 at 8:26 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> GCC normally does this optimization for us in
> strlen_pass::handle_builtin_strcpy but only for optimized
> build. To avoid needing to include strcpy.S in the rtld build to
> support the debug build, just do the optimization by hand.
> ---
>  elf/dl-cache.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/elf/dl-cache.c b/elf/dl-cache.c
> index 8bbf110d02..b97c17b3a9 100644
> --- a/elf/dl-cache.c
> +++ b/elf/dl-cache.c
> @@ -509,8 +509,9 @@ _dl_load_cache_lookup (const char *name)
>       we are accessing. Therefore we must make the copy of the
>       mapping data without using malloc.  */
>    char *temp;
> -  temp = alloca (strlen (best) + 1);
> -  strcpy (temp, best);
> +  size_t best_len = strlen (best) + 1;
> +  temp = alloca (best_len);
> +  memcpy (temp, best, best_len);
>    return __strdup (temp);
>  }
>
> --
> 2.34.1
>

LGTM.

Thanks.

-- 
H.J.