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-rw-r--r--kernel/ksysfs.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 559deca5ed15..2565e1b6dd7b 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -62,6 +62,28 @@ static ssize_t kexec_crash_loaded_show(struct kset *kset, char *page)
KERNEL_ATTR_RO(kexec_crash_loaded);
#endif /* CONFIG_KEXEC */
+/*
+ * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
+ */
+extern const char __start_notes __attribute__((weak));
+extern const char __stop_notes __attribute__((weak));
+#define notes_size (&__stop_notes - &__start_notes)
+
+static ssize_t notes_read(struct kobject *kobj, struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ memcpy(buf, &__start_notes + off, count);
+ return count;
+}
+
+static struct bin_attribute notes_attr = {
+ .attr = {
+ .name = "notes",
+ .mode = S_IRUGO,
+ },
+ .read = &notes_read,
+};
+
decl_subsys(kernel, NULL, NULL);
EXPORT_SYMBOL_GPL(kernel_subsys);
@@ -88,6 +110,12 @@ static int __init ksysfs_init(void)
error = sysfs_create_group(&kernel_subsys.kobj,
&kernel_attr_group);
+ if (!error && notes_size > 0) {
+ notes_attr.size = notes_size;
+ error = sysfs_create_bin_file(&kernel_subsys.kobj,
+ &notes_attr);
+ }
+
return error;
}