1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * /proc/bootconfig - Extra boot configuration
 4 */
 5#include <linux/fs.h>
 6#include <linux/init.h>
 7#include <linux/printk.h>
 8#include <linux/proc_fs.h>
 9#include <linux/seq_file.h>
10#include <linux/bootconfig.h>
11#include <linux/slab.h>
12
13static char *saved_boot_config;
14
15static int boot_config_proc_show(struct seq_file *m, void *v)
16{
17	if (saved_boot_config)
18		seq_puts(m, saved_boot_config);
19	return 0;
20}
21
22/* Rest size of buffer */
23#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
24
25/* Return the needed total length if @size is 0 */
26static int __init copy_xbc_key_value_list(char *dst, size_t size)
27{
28	struct xbc_node *leaf, *vnode;
29	char *key, *end = dst + size;
30	const char *val;
31	char q;
32	int ret = 0;
33
34	key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL);
35	if (!key)
36		return -ENOMEM;
37
38	xbc_for_each_key_value(leaf, val) {
39		ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);
40		if (ret < 0)
41			break;
42		ret = snprintf(dst, rest(dst, end), "%s = ", key);
43		if (ret < 0)
44			break;
45		dst += ret;
46		vnode = xbc_node_get_child(leaf);
47		if (vnode) {
48			xbc_array_for_each_value(vnode, val) {
49				if (strchr(val, '"'))
50					q = '\'';
51				else
52					q = '"';
53				ret = snprintf(dst, rest(dst, end), "%c%s%c%s",
54					q, val, q, xbc_node_is_array(vnode) ? ", " : "\n");
55				if (ret < 0)
56					goto out;
57				dst += ret;
58			}
59		} else {
60			ret = snprintf(dst, rest(dst, end), "\"\"\n");
61			if (ret < 0)
62				break;
63			dst += ret;
64		}
65	}
66out:
67	kfree(key);
68
69	return ret < 0 ? ret : dst - (end - size);
70}
71
72static int __init proc_boot_config_init(void)
73{
74	int len;
75
76	len = copy_xbc_key_value_list(NULL, 0);
77	if (len < 0)
78		return len;
79
80	if (len > 0) {
81		saved_boot_config = kzalloc(len + 1, GFP_KERNEL);
82		if (!saved_boot_config)
83			return -ENOMEM;
84
85		len = copy_xbc_key_value_list(saved_boot_config, len + 1);
86		if (len < 0) {
87			kfree(saved_boot_config);
88			return len;
89		}
90	}
91
92	proc_create_single("bootconfig", 0, NULL, boot_config_proc_show);
93
94	return 0;
95}
96fs_initcall(proc_boot_config_init);

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * /proc/bootconfig - Extra boot configuration
 4 */
 5#include <linux/fs.h>
 6#include <linux/init.h>
 7#include <linux/printk.h>
 8#include <linux/proc_fs.h>
 9#include <linux/seq_file.h>
10#include <linux/bootconfig.h>
11#include <linux/slab.h>
12
13static char *saved_boot_config;
14
15static int boot_config_proc_show(struct seq_file *m, void *v)
16{
17	if (saved_boot_config)
18		seq_puts(m, saved_boot_config);
19	return 0;
20}
21
22/* Rest size of buffer */
23#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
24
25/* Return the needed total length if @size is 0 */
26static int __init copy_xbc_key_value_list(char *dst, size_t size)
27{
28	struct xbc_node *leaf, *vnode;
29	char *key, *end = dst + size;
30	const char *val;
31	char q;
32	int ret = 0;
33
34	key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL);
 
 
35
36	xbc_for_each_key_value(leaf, val) {
37		ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);
38		if (ret < 0)
39			break;
40		ret = snprintf(dst, rest(dst, end), "%s = ", key);
41		if (ret < 0)
42			break;
43		dst += ret;
44		vnode = xbc_node_get_child(leaf);
45		if (vnode) {
46			xbc_array_for_each_value(vnode, val) {
47				if (strchr(val, '"'))
48					q = '\'';
49				else
50					q = '"';
51				ret = snprintf(dst, rest(dst, end), "%c%s%c%s",
52					q, val, q, vnode->next ? ", " : "\n");
53				if (ret < 0)
54					goto out;
55				dst += ret;
56			}
57		} else {
58			ret = snprintf(dst, rest(dst, end), "\"\"\n");
59			if (ret < 0)
60				break;
61			dst += ret;
62		}
63	}
64out:
65	kfree(key);
66
67	return ret < 0 ? ret : dst - (end - size);
68}
69
70static int __init proc_boot_config_init(void)
71{
72	int len;
73
74	len = copy_xbc_key_value_list(NULL, 0);
75	if (len < 0)
76		return len;
77
78	if (len > 0) {
79		saved_boot_config = kzalloc(len + 1, GFP_KERNEL);
80		if (!saved_boot_config)
81			return -ENOMEM;
82
83		len = copy_xbc_key_value_list(saved_boot_config, len + 1);
84		if (len < 0) {
85			kfree(saved_boot_config);
86			return len;
87		}
88	}
89
90	proc_create_single("bootconfig", 0, NULL, boot_config_proc_show);
91
92	return 0;
93}
94fs_initcall(proc_boot_config_init);