RE: [RFC] eal: remove size for eal_set_runtime_dir

["Morten Brørup" <mb@smartsharesystems.com>]

> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Wednesday, 5 January 2022 19.02
> 
> The size argument to eal_set_runtime_dir is useless and was
> being used incorrectly in strlcpy. It worked only because
> all callers passed PATH_MAX which is same as sizeof the destination
> runtime_dir.
> 
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> Suggested-by: Morten Brørup <mb@smartsharesystems.com>
> ---
>  lib/eal/common/eal_common_config.c | 7 ++-----
>  lib/eal/common/eal_private.h       | 4 +---
>  lib/eal/freebsd/eal.c              | 2 +-
>  lib/eal/linux/eal.c                | 2 +-
>  4 files changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/lib/eal/common/eal_common_config.c
> b/lib/eal/common/eal_common_config.c
> index 1c4c4dd585d0..62a9d7a198db 100644
> --- a/lib/eal/common/eal_common_config.c
> +++ b/lib/eal/common/eal_common_config.c
> @@ -29,12 +29,9 @@ rte_eal_get_runtime_dir(void)
>  }
> 
>  int
> -eal_set_runtime_dir(char *run_dir, size_t size)
> +eal_set_runtime_dir(const char *run_dir)
>  {
> -	size_t str_size;
> -
> -	str_size = strlcpy(runtime_dir, run_dir, size);
> -	if (str_size >= size) {
> +	if (strlcpy(runtime_dir, run_dir, PATH_MAX) >= PATH_MAX) {
>  		RTE_LOG(ERR, EAL, "Runtime directory string too long\n");
>  		return -1;
>  	}
> diff --git a/lib/eal/common/eal_private.h
> b/lib/eal/common/eal_private.h
> index 36bcc0b5a492..734f1f334b69 100644
> --- a/lib/eal/common/eal_private.h
> +++ b/lib/eal/common/eal_private.h
> @@ -681,13 +681,11 @@ eal_mem_set_dump(void *virt, size_t size, bool
> dump);
>   *
>   * @param run_dir
>   *   The new runtime directory path of DPDK
> - * @param size
> - *   The size of the new runtime directory path in bytes.
>   * @return
>   *   0 on success, (-1) on failure.
>   */
>  int
> -eal_set_runtime_dir(char *run_dir, size_t size);
> +eal_set_runtime_dir(const char *run_dir);
> 
>  /**
>   * Get the internal configuration structure.
> diff --git a/lib/eal/freebsd/eal.c b/lib/eal/freebsd/eal.c
> index a1cd2462db1b..503e276dc27f 100644
> --- a/lib/eal/freebsd/eal.c
> +++ b/lib/eal/freebsd/eal.c
> @@ -123,7 +123,7 @@ eal_create_runtime_dir(void)
>  		return -1;
>  	}
> 
> -	if (eal_set_runtime_dir(run_dir, sizeof(run_dir)))
> +	if (eal_set_runtime_dir(run_dir))
>  		return -1;
> 
>  	return 0;
> diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
> index 80ffe1c7f9d8..a73ff75f65c9 100644
> --- a/lib/eal/linux/eal.c
> +++ b/lib/eal/linux/eal.c
> @@ -135,7 +135,7 @@ eal_create_runtime_dir(void)
>  		return -1;
>  	}
> 
> -	if (eal_set_runtime_dir(run_dir, sizeof(run_dir)))
> +	if (eal_set_runtime_dir(run_dir))
>  		return -1;
> 
>  	return 0;
> --
> 2.30.2
> 

Reviewed-by: Morten Brørup<mb@smartsharesystems.com>