Hi,
Hi Volodymyr,
On 22/11/2024 21:07, Volodymyr Babchuk wrote:
diff --git a/xen/include/xen/stack_protector.h
b/xen/include/xen/stack_protector.h
new file mode 100644
index 0000000000..97f1eb5ac0
--- /dev/null
+++ b/xen/include/xen/stack_protector.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef XEN__STACK_PROTECTOR_H
+#define XEN__STACK_PROTECTOR_H
+
+#ifdef CONFIG_STACKPROTECTOR
+
+#ifndef CONFIG_X86
+extern unsigned long __stack_chk_guard;
Is this variable meant to change after boot? If not, then can you tag it
with __ro_after_init?
+#endif
+
+/*
+ * This function should be always inlined. Also it should be called
+ * from a function that never returns.
+ */
+static inline void boot_stack_chk_guard_setup(void)
+{
+ __stack_chk_guard = get_random();
+ if (BITS_PER_LONG == 64)
+ __stack_chk_guard |= ((unsigned long)get_random()) << 32;
+}
+
+#else
+
+static inline void boot_stack_chk_guard_setup(void) {}
+
+#endif /* CONFIG_STACKPROTECTOR */
+
+#endif /* XEN__STACK_PROTECTOR_H */
+
Cheers,
--
Julien Grall
