2 files changed, 48 insertions, 1 deletions
diff --git a/arch/s390/boot/ipl_parm.c b/arch/s390/boot/ipl_parm.c
index 7f8e546400a1..9dab596be98e 100644
--- a/arch/s390/boot/ipl_parm.c
+++ b/arch/s390/boot/ipl_parm.c
@@ -13,6 +13,7 @@ int __bootdata(early_ipl_block_valid);
 
 unsigned long __bootdata(memory_end);
 int __bootdata(memory_end_set);
+int __bootdata(noexec_disabled);
 
 static inline int __diag308(unsigned long subcode, void *addr)
 {
@@ -145,8 +146,10 @@ void setup_boot_command_line(void)
 static char command_line_buf[COMMAND_LINE_SIZE] __section(.data);
 static void parse_mem_opt(void)
 {
-	char *args;
 	char *param, *val;
+	bool enabled;
+	char *args;
+	int rc;
 
 	args = strcpy(command_line_buf, early_command_line);
 	while (*args) {
@@ -156,6 +159,12 @@ static void parse_mem_opt(void)
 			memory_end = memparse(val, NULL);
 			memory_end_set = 1;
 		}
+
+		if (!strcmp(param, "noexec")) {
+			rc = kstrtobool(val, &enabled);
+			if (!rc && !enabled)
+				noexec_disabled = 1;
+		}
 	}
 }
 
diff --git a/arch/s390/boot/string.c b/arch/s390/boot/string.c
index 09ca9130e73a..25aca07898ba 100644
--- a/arch/s390/boot/string.c
+++ b/arch/s390/boot/string.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/ctype.h>
 #include <linux/kernel.h>
+#include <linux/errno.h>
 #include "../lib/string.c"
 
 int strncmp(const char *cs, const char *ct, size_t count)
@@ -98,3 +99,40 @@ long simple_strtol(const char *cp, char **endp, unsigned int base)
 
 	return simple_strtoull(cp, endp, base);
 }
+
+int kstrtobool(const char *s, bool *res)
+{
+	if (!s)
+		return -EINVAL;
+
+	switch (s[0]) {
+	case 'y':
+	case 'Y':
+	case '1':
+		*res = true;
+		return 0;
+	case 'n':
+	case 'N':
+	case '0':
+		*res = false;
+		return 0;
+	case 'o':
+	case 'O':
+		switch (s[1]) {
+		case 'n':
+		case 'N':
+			*res = true;
+			return 0;
+		case 'f':
+		case 'F':
+			*res = false;
+			return 0;
+		default:
+			break;
+		}
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}