3 files changed, 43 insertions, 1 deletions
diff --git a/arch/s390/include/asm/arch-stackprotector.h b/arch/s390/include/asm/arch-stackprotector.h
new file mode 100644
index 000000000000..953627259e91
--- /dev/null
+++ b/arch/s390/include/asm/arch-stackprotector.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_S390_ARCH_STACKPROTECTOR_H
+#define _ASM_S390_ARCH_STACKPROTECTOR_H
+
+extern unsigned long __stack_chk_guard;
+extern int stack_protector_debug;
+
+void __stack_protector_apply_early(unsigned long kernel_start);
+int __stack_protector_apply(unsigned long *start, unsigned long *end, unsigned long kernel_start);
+
+static inline void stack_protector_apply_early(unsigned long kernel_start)
+{
+	if (IS_ENABLED(CONFIG_STACKPROTECTOR))
+		__stack_protector_apply_early(kernel_start);
+}
+
+static inline int stack_protector_apply(unsigned long *start, unsigned long *end)
+{
+	if (IS_ENABLED(CONFIG_STACKPROTECTOR))
+		return __stack_protector_apply(start, end, 0);
+	return 0;
+}
+
+#endif /* _ASM_S390_ARCH_STACKPROTECTOR_H */
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index d9c853db9a40..50ffe75adeb4 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -100,7 +100,8 @@ struct lowcore {
 
 	/* Save areas. */
 	__u64	save_area[8];			/* 0x0200 */
-	__u8	pad_0x0240[0x0280-0x0240];	/* 0x0240 */
+	__u64	stack_canary;			/* 0x0240 */
+	__u8	pad_0x0248[0x0280-0x0248];	/* 0x0248 */
 	__u64	save_area_restart[1];		/* 0x0280 */
 
 	__u64	pcpu;				/* 0x0288 */
diff --git a/arch/s390/include/asm/stackprotector.h b/arch/s390/include/asm/stackprotector.h
new file mode 100644
index 000000000000..0497850103dd
--- /dev/null
+++ b/arch/s390/include/asm/stackprotector.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_S390_STACKPROTECTOR_H
+#define _ASM_S390_STACKPROTECTOR_H
+
+#include <linux/sched.h>
+#include <asm/current.h>
+#include <asm/lowcore.h>
+
+static __always_inline void boot_init_stack_canary(void)
+{
+	current->stack_canary = get_random_canary();
+	get_lowcore()->stack_canary = current->stack_canary;
+}
+
+#endif /* _ASM_S390_STACKPROTECTOR_H */