Merge tag 'audit-pr-20210215' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoor...

[linux-2.6-microblaze.git] / lib / ubsan.c

diff --git a/lib/ubsan.c b/lib/ubsan.c
index 3e3352f..bec38c6 100644 (file)
--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -427,3 +427,34 @@ void __ubsan_handle_load_invalid_value(void *_data, void *val)
        ubsan_epilogue();
 }
 EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
+
+void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
+                                        unsigned long align,
+                                        unsigned long offset);
+void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
+                                        unsigned long align,
+                                        unsigned long offset)
+{
+       struct alignment_assumption_data *data = _data;
+       unsigned long real_ptr;
+
+       if (suppress_report(&data->location))
+               return;
+
+       ubsan_prologue(&data->location, "alignment-assumption");
+
+       if (offset)
+               pr_err("assumption of %lu byte alignment (with offset of %lu byte) for pointer of type %s failed",
+                      align, offset, data->type->type_name);
+       else
+               pr_err("assumption of %lu byte alignment for pointer of type %s failed",
+                      align, data->type->type_name);
+
+       real_ptr = ptr - offset;
+       pr_err("%saddress is %lu aligned, misalignment offset is %lu bytes",
+              offset ? "offset " : "", BIT(real_ptr ? __ffs(real_ptr) : 0),
+              real_ptr & (align - 1));
+
+       ubsan_epilogue();
+}
+EXPORT_SYMBOL(__ubsan_handle_alignment_assumption);