linux-hardening - Re: [PATCH v2] drivers/edac/edac

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Date:   Mon, 2 Aug 2021 11:52:06 +0200
From:   Robert Richter <rric@...nel.org>
To:     Len Baker <len.baker@....com>
Cc:     Kees Cook <keescook@...omium.org>, Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        linux-hardening@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers/edac/edac_mc: Remove all strcpy() uses

On 02.08.21 11:19:33, Robert Richter wrote:
> 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);

Another note: Other parts of the code use 'len' instead of 'left', so
if you could change that too?

Thanks,

-Robert

> >  				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);
> >  		}
> >