linux-hardening - Re: [PATCH v6] EDAC/mc: Prefer strscpy or scnprintf over strcpy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 03 Sep 2021 10:03:18 -0700
From:   Joe Perches <joe@...ches.com>
To:     Len Baker <len.baker@....com>
Cc:     Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>,
        David Laight <David.Laight@...lab.com>,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] EDAC/mc: Prefer strscpy or scnprintf over strcpy

On 2021-09-03 08:05, Len Baker wrote:
> strcpy() performs no bounds checking on the destination buffer. 
> len.baker@....com/

[]

> @@ -1113,12 +1115,9 @@ void edac_mc_handle_error(const enum
> hw_event_mc_err_type type,
>  			p = e->label;
>  			*p = '\0';
>  		} else {
> -			if (p != e->label) {
> -				strcpy(p, OTHER_LABEL);
> -				p += strlen(OTHER_LABEL);
> -			}
> -			strcpy(p, dimm->label);
> -			p += strlen(p);
> +			n += scnprintf(e->label + n, sizeof(e->label) - n,
> +				       "%s%s", prefix, dimm->label);
> +			prefix = OTHER_LABEL;

OTHER_LABEL is a define specific to this module

IMO: Used once text macros are just obfuscating and should be removed.