Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 2 Aug 2021 11:19:27 +0200
From:   Robert Richter <rric@kernel.org>
To:     Len Baker <len.baker@gmx.com>
Cc:     Kees Cook <keescook@chromium.org>, Borislav Petkov <bp@alien8.de>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Tony Luck <tony.luck@intel.com>,
        James Morse <james.morse@arm.com>,
        linux-hardening@vger.kernel.org, linux-edac@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] drivers/edac/edac_mc: Remove all strcpy() uses
Message-ID: <YQe4n5H00g3xhSbQ@rric.localdomain>
References: <20210801143558.12674-1-len.baker@gmx.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20210801143558.12674-1-len.baker@gmx.com>
Precedence: bulk

On 01.08.21 16:35:58, Len Baker wrote:

> @@ -1114,10 +1116,12 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
>  			*p = '\0';
>  		} else {
>  			if (p != e->label) {
> -				strcpy(p, OTHER_LABEL);
> +				strscpy(p, OTHER_LABEL, left);
> +				left -= strlen(OTHER_LABEL);
>  				p += strlen(OTHER_LABEL);

Those both must be strlen(p) now as otherwise 'left' could underflow
(and p overflow).

-Robert

>  			}
> -			strcpy(p, dimm->label);
> +			strscpy(p, dimm->label, left);
> +			left -= strlen(p);
>  			p += strlen(p);
>  		}
>