[PATCH] EDAC/mc: Prefer strscpy or scnprintf over strcpy, sprintf and snprintf

[Len Baker]

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().
[1][2]

However, to simplify and clarify the code, to concatenate labels use
the scnprintf() function. This way it is not necessary to check the
return value of strscpy (-E2BIG if the parameter count is 0 or the src
was truncated) since the scnprintf returns always the number of chars
written into the buffer. This function returns always a nul-terminated
string even if it needs to be truncated.

While at it, fix all other broken string generation code that wrongly
interprets snprintf()'s return code or just uses sprintf(), implement
that using scnprintf() here too. Drop breaks in loops around
scnprintf() as it is safe now to loop. Moreover, the check is
needless: For the case when the buffer is exhausted, len never gets
zero because scnprintf() takes the full buffer length as input
parameter, but excludes the trailing '\0' in its return code and thus,
1 is the minimum len.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy
[2] https://github.com/KSPP/linux/issues/88

 [ rric: Replace snprintf() with scnprintf(), rework sprintf() user,
   drop breaks in loops around scnprintf(), introduce 'end' pointer to
   reduce pointer arithmetic, use prefix pattern for e->location,
   adjust subject and description ]

Co-developed-by: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Len Baker <len.baker@xxxxxxx>
Signed-off-by: Robert Richter <rrichter@xxxxxxx>
---
 drivers/edac/edac_mc.c | 42 ++++++++++++++++++------------------------
 1 file changed, 18 insertions(+), 24 deletions(-)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 2c5975674723..9f82ca295353 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -66,14 +66,12 @@ unsigned int edac_dimm_info_location(struct dimm_info *dimm, char *buf,
 	char *p = buf;
 
 	for (i = 0; i < mci->n_layers; i++) {
-		n = snprintf(p, len, "%s %d ",
+		n = scnprintf(p, len, "%s %d ",
 			      edac_layer_name[mci->layers[i].type],
 			      dimm->location[i]);
 		p += n;
 		len -= n;
 		count += n;
-		if (!len)
-			break;
 	}
 
 	return count;
@@ -341,19 +339,16 @@ static int edac_mc_alloc_dimms(struct mem_ctl_info *mci)
 		 */
 		len = sizeof(dimm->label);
 		p = dimm->label;
-		n = snprintf(p, len, "mc#%u", mci->mc_idx);
+		n = scnprintf(p, len, "mc#%u", mci->mc_idx);
 		p += n;
 		len -= n;
 		for (layer = 0; layer < mci->n_layers; layer++) {
-			n = snprintf(p, len, "%s#%u",
-				     edac_layer_name[mci->layers[layer].type],
-				     pos[layer]);
+			n = scnprintf(p, len, "%s#%u",
+				      edac_layer_name[mci->layers[layer].type],
+				      pos[layer]);
 			p += n;
 			len -= n;
 			dimm->location[layer] = pos[layer];
-
-			if (len <= 0)
-				break;
 		}
 
 		/* Link it to the csrows old API data */
@@ -1027,12 +1022,13 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
 			  const char *other_detail)
 {
 	struct dimm_info *dimm;
-	char *p;
+	char *p, *end;
 	int row = -1, chan = -1;
 	int pos[EDAC_MAX_LAYERS] = { top_layer, mid_layer, low_layer };
 	int i, n_labels = 0;
 	struct edac_raw_error_desc *e = &mci->error_desc;
 	bool any_memory = true;
+	const char *prefix;
 
 	edac_dbg(3, "MC%d\n", mci->mc_idx);
 
@@ -1087,6 +1083,8 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
 	 */
 	p = e->label;
 	*p = '\0';
+	end = p + sizeof(e->label);
+	prefix = "";
 
 	mci_for_each_dimm(mci, dimm) {
 		if (top_layer >= 0 && top_layer != dimm->location[0])
@@ -1114,12 +1112,8 @@ 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);
+			p += scnprintf(p, end - p, "%s%s", prefix, dimm->label);
+			prefix = OTHER_LABEL;
 		}
 
 		/*
@@ -1141,25 +1135,25 @@ void edac_mc_handle_error(const enum hw_event_mc_err_type type,
 	}
 
 	if (any_memory)
-		strcpy(e->label, "any memory");
+		strscpy(e->label, "any memory", sizeof(e->label));
 	else if (!*e->label)
-		strcpy(e->label, "unknown memory");
+		strscpy(e->label, "unknown memory", sizeof(e->label));
 
 	edac_inc_csrow(e, row, chan);
 
 	/* Fill the RAM location data */
 	p = e->location;
+	end = p + sizeof(e->location);
+	prefix = "";
 
 	for (i = 0; i < mci->n_layers; i++) {
 		if (pos[i] < 0)
 			continue;
 
-		p += sprintf(p, "%s:%d ",
-			     edac_layer_name[mci->layers[i].type],
-			     pos[i]);
+		p += scnprintf(p, end - p, "%s%s:%d", prefix,
+			       edac_layer_name[mci->layers[i].type], pos[i]);
+		prefix = " ";
 	}
-	if (p > e->location)
-		*(p - 1) = '\0';
 
 	edac_raw_mc_handle_error(e);
 }
-- 
2.30.2