linux-hardening - Re: [PATCH v2 3/7] scsi: qedf: replace deprecated strncpy with strscpy

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Date: Wed, 28 Feb 2024 16:04:08 -0800
From: Kees Cook <keescook@...omium.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>,
	Ariel Elior <aelior@...vell.com>,
	Manish Chopra <manishc@...vell.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Saurav Kashyap <skashyap@...vell.com>,
	Javed Hasan <jhasan@...vell.com>,
	GR-QLogic-Storage-Upstream@...vell.com,
	Nilesh Javali <njavali@...vell.com>,
	Manish Rangankar <mrangankar@...vell.com>,
	Don Brace <don.brace@...rochip.com>,
	mpi3mr-linuxdrv.pdl@...adcom.com, linux-scsi@...r.kernel.org,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
	MPT-FusionLinux.pdl@...adcom.com, netdev@...r.kernel.org,
	storagedev@...rochip.com
Subject: Re: [PATCH v2 3/7] scsi: qedf: replace deprecated strncpy with
 strscpy

On Wed, Feb 28, 2024 at 10:59:03PM +0000, Justin Stitt wrote:
> We expect slowpath_params.name to be NUL-terminated based on its future
> usage with other string APIs:
> 
> |	static int qed_slowpath_start(struct qed_dev *cdev,
> |				      struct qed_slowpath_params *params)
> ...
> |	strscpy(drv_version.name, params->name,
> |		MCP_DRV_VER_STR_SIZE - 4);
> 
> Moreover, NUL-padding is not necessary as the only use for this slowpath
> name parameter is to copy into the drv_version.name field.
> 
> Also, let's prefer using strscpy(src, dest, sizeof(src)) in two
> instances (one of which is outside of the scsi system but it is trivial
> and related to this patch).
> 
> We can see the drv_version.name size here:
> |	struct qed_mcp_drv_version {
> |		u32	version;
> |		u8	name[MCP_DRV_VER_STR_SIZE - 4];
> |	};
> 
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook