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// SPDX-License-Identifier: GPL-2.0
/*
* /proc/bootconfig - Extra boot configuration
*/
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/printk.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/bootconfig.h>
#include <linux/slab.h>
static char *saved_boot_config;
static int boot_config_proc_show(struct seq_file *m, void *v)
{
if (saved_boot_config)
seq_puts(m, saved_boot_config);
return 0;
}
/* Rest size of buffer */
#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
/* Return the needed total length if @size is 0 */
static int __init copy_xbc_key_value_list(char *dst, size_t size)
{
struct xbc_node *leaf, *vnode;
char *key, *end = dst + size;
const char *val;
char q;
int ret = 0;
key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL);
if (!key)
return -ENOMEM;
xbc_for_each_key_value(leaf, val) {
ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);
if (ret < 0)
break;
ret = snprintf(dst, rest(dst, end), "%s = ", key);
if (ret < 0)
break;
dst += ret;
vnode = xbc_node_get_child(leaf);
if (vnode) {
xbc_array_for_each_value(vnode, val) {
if (strchr(val, '"'))
q = '\'';
else
q = '"';
ret = snprintf(dst, rest(dst, end), "%c%s%c%s",
q, val, q, xbc_node_is_array(vnode) ? ", " : "\n");
if (ret < 0)
goto out;
dst += ret;
}
} else {
ret = snprintf(dst, rest(dst, end), "\"\"\n");
if (ret < 0)
break;
dst += ret;
}
}
if (cmdline_has_extra_options() && ret >= 0 && boot_command_line[0]) {
ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n",
boot_command_line);
if (ret > 0)
dst += ret;
}
out:
kfree(key);
return ret < 0 ? ret : dst - (end - size);
}
static int __init proc_boot_config_init(void)
{
int len;
len = copy_xbc_key_value_list(NULL, 0);
if (len < 0)
return len;
if (len > 0) {
saved_boot_config = kzalloc(len + 1, GFP_KERNEL);
if (!saved_boot_config)
return -ENOMEM;
len = copy_xbc_key_value_list(saved_boot_config, len + 1);
if (len < 0) {
kfree(saved_boot_config);
return len;
}
}
proc_create_single("bootconfig", 0, NULL, boot_config_proc_show);
return 0;
}
fs_initcall(proc_boot_config_init);
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