@@ -230,6 +230,15 @@ void kmsan_handle_urb(const struct urb *urb, bool is_out);
*/
void kmsan_unpoison_entry_regs(const struct pt_regs *regs);
+/**
+ * kmsan_get_metadata() - Return a pointer to KMSAN shadow or origins.
+ * @addr: kernel address.
+ * @is_origin: whether to return origins or shadow.
+ *
+ * Return NULL if metadata cannot be found.
+ */
+void *kmsan_get_metadata(void *addr, bool is_origin);
+
#else
static inline void kmsan_init_shadow(void)
@@ -329,6 +338,11 @@ static inline void kmsan_unpoison_entry_regs(const struct pt_regs *regs)
{
}
+static inline void *kmsan_get_metadata(void *addr, bool is_origin)
+{
+ return NULL;
+}
+
#endif
#endif /* _LINUX_KMSAN_H */
@@ -14,6 +14,7 @@
#include "kmsan.h"
#include <linux/gfp.h>
+#include <linux/kmsan.h>
#include <linux/kmsan_string.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
@@ -66,7 +66,6 @@ struct shadow_origin_ptr {
struct shadow_origin_ptr kmsan_get_shadow_origin_ptr(void *addr, u64 size,
bool store);
-void *kmsan_get_metadata(void *addr, bool is_origin);
void __init kmsan_init_alloc_meta_for_range(void *start, void *end);
enum kmsan_bug_reason {
Each s390 CPU has lowcore pages associated with it. Each CPU sees its own lowcore at virtual address 0 through a hardware mechanism called prefixing. Additionally, all lowcores are mapped to non-0 virtual addresses stored in the lowcore_ptr[] array. When lowcore is accessed through virtual address 0, one needs to resolve metadata for lowcore_ptr[raw_smp_processor_id()]. Expose kmsan_get_metadata() to make it possible to do this from the arch code. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> --- include/linux/kmsan.h | 14 ++++++++++++++ mm/kmsan/instrumentation.c | 1 + mm/kmsan/kmsan.h | 1 - 3 files changed, 15 insertions(+), 1 deletion(-)