linux-kernel - Re: [PATCH v4] scsi: target: transform strncpy into strscpy

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Message-Id: <D908SSFL0E9D.24WXC0I3O6AQB@bsdbackstore.eu>
Date: Mon, 07 Apr 2025 09:53:20 +0200
From: "Maurizio Lombardi" <mlombard@...backstore.eu>
To: "Baris Can Goral" <goralbaris@...il.com>, <martin.petersen@...cle.com>
Cc: <linux-scsi@...r.kernel.org>, <target-devel@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <skhan@...uxfoundation.org>,
 <linux-kernel-mentees@...ts.linux.dev>
Subject: Re: [PATCH v4] scsi: target: transform strncpy into strscpy

On Sat Apr 5, 2025 at 4:36 PM CEST, Baris Can Goral wrote:
> The strncpy() function is actively dangerous to use since it may not
> NULL-terminate the destination string,resulting in potential memory
> content exposures, unbounded reads, or crashes.
>
> Link:https://github.com/KSPP/linux/issues/90
> Signed-off-by: Baris Can Goral <goralbaris@...il.com>
> ---
> Changes from v4:
> 	-Description added
> 	-User name corrected
> 	-formatting issues.
> 	-commit name changed
>  drivers/target/target_core_configfs.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
> index c40217f44b1b..5c0b74e76be2 100644
> --- a/drivers/target/target_core_configfs.c
> +++ b/drivers/target/target_core_configfs.c
> @@ -143,7 +143,7 @@ static ssize_t target_core_item_dbroot_store(struct config_item *item,
>  	}
>  	filp_close(fp, NULL);
>  
> -	strncpy(db_root, db_root_stage, read_bytes);
> +	strscpy(db_root, db_root_stage, read_bytes);
>  	pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
>  
>  	r = read_bytes;
> @@ -3664,7 +3664,7 @@ static void target_init_dbroot(void)
>  	}
>  	filp_close(fp, NULL);
>  
> -	strncpy(db_root, db_root_stage, DB_ROOT_LEN);
> +	strscpy(db_root, db_root_stage, DB_ROOT_LEN);
>  	pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root);
>  }
>  

This patch doesn't apply anymore.
strncpy() has already been replaced with strscpy()
in version 6.14-rc2.


Maurizio