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	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		if (ret >= 0 && boot_command_line[0]) {
 66			ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n",
 67				       boot_command_line);
 68			if (ret > 0)
 69				dst += ret;
 70		}
 71	}
 72out:
 73	kfree(key);
 74
 75	return ret < 0 ? ret : dst - (end - size);
 76}
 77
 78static int __init proc_boot_config_init(void)
 79{
 80	int len;
 81
 82	len = copy_xbc_key_value_list(NULL, 0);
 83	if (len < 0)
 84		return len;
 85
 86	if (len > 0) {
 87		saved_boot_config = kzalloc(len + 1, GFP_KERNEL);
 88		if (!saved_boot_config)
 89			return -ENOMEM;
 90
 91		len = copy_xbc_key_value_list(saved_boot_config, len + 1);
 92		if (len < 0) {
 93			kfree(saved_boot_config);
 94			return len;
 95		}
 96	}
 97
 98	proc_create_single("bootconfig", 0, NULL, boot_config_proc_show);
 99
100	return 0;
101}
102fs_initcall(proc_boot_config_init);