From: Jane Malalane <jane.malalane@citrix.com>
Date: Wed, 25 Aug 2021 13:10:32 +0000 (+0200)
Subject: xen/lib: Fix strcmp() and strncmp()
X-Git-Tag: archive/raspbian/4.14.3-1+rpi1^2~44^2~12
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=8df03ef746dec2d4612ef7ea1933e8066783ad27;p=xen.git

xen/lib: Fix strcmp() and strncmp()

The C standard requires that each character be compared as unsigned
char. Xen's current behaviour compares as signed char, which changes
the answer when chars with a value greater than 0x7f are used.

Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jane Malalane <jane.malalane@citrix.com>
Reviewed-by: Ian Jackson <iwj@xenproject.org>
master commit: 3747a2bb67daa5a8baeff6cda57dc98a5ef79c3e
master date: 2021-07-30 10:52:46 +0100
---

diff --git a/xen/common/string.c b/xen/common/string.c
index af3d96ad0f..43624b1b45 100644
--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -119,14 +119,16 @@ EXPORT_SYMBOL(strlcat);
  */
 int (strcmp)(const char *cs, const char *ct)
 {
-	register signed char __res;
+	unsigned char *csu = (unsigned char *)cs;
+	unsigned char *ctu = (unsigned char *)ct;
+	int res;
 
 	while (1) {
-		if ((__res = *cs - *ct++) != 0 || !*cs++)
+		if ((res = *csu - *ctu++) != 0 || !*csu++)
 			break;
 	}
 
-	return __res;
+	return res;
 }
 #endif
 
@@ -139,15 +141,17 @@ int (strcmp)(const char *cs, const char *ct)
  */
 int (strncmp)(const char *cs, const char *ct, size_t count)
 {
-	register signed char __res = 0;
+	unsigned char *csu = (unsigned char *)cs;
+	unsigned char *ctu = (unsigned char *)ct;
+	int res = 0;
 
 	while (count) {
-		if ((__res = *cs - *ct++) != 0 || !*cs++)
+		if ((res = *csu - *ctu++) != 0 || !*csu++)
 			break;
 		count--;
 	}
 
-	return __res;
+	return res;
 }
 #endif