@@ -32,6 +32,12 @@ enum kasan_arg_mode {
 	KASAN_ARG_MODE_ASYMM,
 };
 
+enum kasan_arg_vmalloc {
+	KASAN_ARG_VMALLOC_DEFAULT,
+	KASAN_ARG_VMALLOC_OFF,
+	KASAN_ARG_VMALLOC_ON,
+};
+
 enum kasan_arg_stacktrace {
 	KASAN_ARG_STACKTRACE_DEFAULT,
 	KASAN_ARG_STACKTRACE_OFF,

@@ -40,6 +46,7 @@ enum kasan_arg_stacktrace {
 
 static enum kasan_arg kasan_arg __ro_after_init;
 static enum kasan_arg_mode kasan_arg_mode __ro_after_init;
+static enum kasan_arg_vmalloc kasan_arg_vmalloc __initdata;
 static enum kasan_arg_stacktrace kasan_arg_stacktrace __initdata;
 
 /* Whether KASAN is enabled at all. */

@@ -50,6 +57,9 @@ EXPORT_SYMBOL(kasan_flag_enabled);
 enum kasan_mode kasan_mode __ro_after_init;
 EXPORT_SYMBOL_GPL(kasan_mode);
 
+/* Whether to enable vmalloc tagging. */
+DEFINE_STATIC_KEY_FALSE(kasan_flag_vmalloc);
+
 /* Whether to collect alloc/free stack traces. */
 DEFINE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
 

@@ -89,6 +99,23 @@ static int __init early_kasan_mode(char *arg)
 }
 early_param("kasan.mode", early_kasan_mode);
 
+/* kasan.vmalloc=off/on */
+static int __init early_kasan_flag_vmalloc(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	if (!strcmp(arg, "off"))
+		kasan_arg_vmalloc = KASAN_ARG_VMALLOC_OFF;
+	else if (!strcmp(arg, "on"))
+		kasan_arg_vmalloc = KASAN_ARG_VMALLOC_ON;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+early_param("kasan.vmalloc", early_kasan_flag_vmalloc);
+
 /* kasan.stacktrace=off/on */
 static int __init early_kasan_flag_stacktrace(char *arg)
 {

@@ -172,6 +199,18 @@ void __init kasan_init_hw_tags(void)
 		break;
 	}
 
+	switch (kasan_arg_vmalloc) {
+	case KASAN_ARG_VMALLOC_DEFAULT:
+		/* Default to enabling vmalloc tagging. */
+		fallthrough;
+	case KASAN_ARG_VMALLOC_ON:
+		static_branch_enable(&kasan_flag_vmalloc);
+		break;
+	case KASAN_ARG_VMALLOC_OFF:
+		/* Do nothing, kasan_flag_vmalloc keeps its default value. */
+		break;
+	}
+
 	switch (kasan_arg_stacktrace) {
 	case KASAN_ARG_STACKTRACE_DEFAULT:
 		/* Default to enabling stack trace collection. */

@@ -184,8 +223,9 @@ void __init kasan_init_hw_tags(void)
 		break;
 	}
 
-	pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, stacktrace=%s)\n",
+	pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, vmalloc=%s, stacktrace=%s)\n",
 		kasan_mode_info(),
+		kasan_vmalloc_enabled() ? "on" : "off",
 		kasan_stack_collection_enabled() ? "on" : "off");
 }
 

@@ -218,6 +258,9 @@ void *__kasan_unpoison_vmalloc(const void *start, unsigned long size,
 	u8 tag;
 	unsigned long redzone_start, redzone_size;
 
+	if (!kasan_vmalloc_enabled())
+		return (void *)start;
+
 	if (!is_vmalloc_or_module_addr(start))
 		return (void *)start;
 

@@ -12,6 +12,7 @@
 #include <linux/static_key.h>
 #include "../slab.h"
 
+DECLARE_STATIC_KEY_FALSE(kasan_flag_vmalloc);
 DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
 
 enum kasan_mode {

@@ -22,6 +23,11 @@ enum kasan_mode {
 
 extern enum kasan_mode kasan_mode __ro_after_init;
 
+static inline bool kasan_vmalloc_enabled(void)
+{
+	return static_branch_likely(&kasan_flag_vmalloc);
+}
+
 static inline bool kasan_stack_collection_enabled(void)
 {
 	return static_branch_unlikely(&kasan_flag_stacktrace);