Resguardo inicial

linux-7.2.3/arch/x86/lib/error-inject.c

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/linkage.h>
+#include <linux/error-injection.h>
+#include <linux/kprobes.h>
+#include <linux/objtool.h>
+
+asmlinkage void just_return_func(void);
+
+asm(
+	".text\n"
+	".type just_return_func, @function\n"
+	".globl just_return_func\n"
+	ASM_FUNC_ALIGN
+	"just_return_func:\n"
+		ANNOTATE_NOENDBR "\n"
+		ASM_RET
+	".size just_return_func, .-just_return_func\n"
+);
+
+void override_function_with_return(struct pt_regs *regs)
+{
+	regs->ip = (unsigned long)&just_return_func;
+}
+NOKPROBE_SYMBOL(override_function_with_return);