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-rw-r--r--kernel/configs.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/kernel/configs.c b/kernel/configs.c
new file mode 100644
index 000000000..a28c79c5f
--- /dev/null
+++ b/kernel/configs.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * kernel/configs.c
+ * Echo the kernel .config file used to build the kernel
+ *
+ * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
+ * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
+ * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
+ * Copyright (C) 2002 Hewlett-Packard Company
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/uaccess.h>
+
+/*
+ * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
+ * a binary kernel image or a module. See scripts/extract-ikconfig.
+ */
+asm (
+" .pushsection .rodata, \"a\" \n"
+" .ascii \"IKCFG_ST\" \n"
+" .global kernel_config_data \n"
+"kernel_config_data: \n"
+" .incbin \"kernel/config_data.gz\" \n"
+" .global kernel_config_data_end \n"
+"kernel_config_data_end: \n"
+" .ascii \"IKCFG_ED\" \n"
+" .popsection \n"
+);
+
+#ifdef CONFIG_IKCONFIG_PROC
+
+extern char kernel_config_data;
+extern char kernel_config_data_end;
+
+static ssize_t
+ikconfig_read_current(struct file *file, char __user *buf,
+ size_t len, loff_t * offset)
+{
+ return simple_read_from_buffer(buf, len, offset,
+ &kernel_config_data,
+ &kernel_config_data_end -
+ &kernel_config_data);
+}
+
+static const struct proc_ops config_gz_proc_ops = {
+ .proc_read = ikconfig_read_current,
+ .proc_lseek = default_llseek,
+};
+
+static int __init ikconfig_init(void)
+{
+ struct proc_dir_entry *entry;
+
+ /* create the current config file */
+ entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
+ &config_gz_proc_ops);
+ if (!entry)
+ return -ENOMEM;
+
+ proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
+
+ return 0;
+}
+
+static void __exit ikconfig_cleanup(void)
+{
+ remove_proc_entry("config.gz", NULL);
+}
+
+module_init(ikconfig_init);
+module_exit(ikconfig_cleanup);
+
+#endif /* CONFIG_IKCONFIG_PROC */
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Randy Dunlap");
+MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");