Hi,

On Sat, Aug 07, 2021 at 10:09:35AM -0700, Joe Perches wrote:

On Sat, 2021-08-07 at 17:59 +0200, Len Baker wrote:

quoted

strcpy() performs no bounds checking on the destination buffer. This
could result in linear overflows beyond the end of the buffer, leading
to all kinds of misbehaviors. The safe replacement is strscpy().

Probably better to change the commit subject to something like
what is generally used by the subsystem.

Maybe:
	EDAC/mc: Convert strcpy to strscpy
or
	EDAC/mc: Prefer strscpy over strcpy

Ok, no problem. I like the second one.

and also:

quoted

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c

[]

quoted

@@ -1113,11 +1115,11 @@ 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);
+			const char *text = (p != e->label) ? OTHER_LABEL :
+				dimm->label;
+
+			strscpy(p, text, len);
+			len -= strlen(p);
 			p += strlen(p);

Perhaps this should use scnprintf rather than strscpy
Something like:
			n += scnprintf(buf + n, len - n, "%s",
				       p == e->label ? dim->label : OTHER_LABEL);

In the first version [1] the scnprintf was used but Robert Richter don't
see any benefit compared with the current implementation.

[1] https://lore.kernel.org/linux-hardening/20210725162954.9861-1-len.baker@gmx.com/ (local)

Regards,
Len