3095f832a27684714e4dc0e6f60620337c575456
[openwrt/openwrt.git] / target / linux / generic / hack-4.9 / 902-debloat_proc.patch
1 From 9e3f1d0805b2d919904dd9a4ff0d956314cc3cba Mon Sep 17 00:00:00 2001
2 From: Felix Fietkau <nbd@nbd.name>
3 Date: Sat, 8 Jul 2017 08:20:09 +0200
4 Subject: debloat: procfs
5
6 Signed-off-by: Felix Fietkau <nbd@nbd.name>
7 ---
8 fs/locks.c | 2 ++
9 fs/proc/Kconfig | 5 +++++
10 fs/proc/consoles.c | 3 +++
11 fs/proc/proc_tty.c | 11 ++++++++++-
12 include/net/snmp.h | 18 +++++++++++++++++-
13 ipc/msg.c | 3 +++
14 ipc/sem.c | 2 ++
15 ipc/shm.c | 2 ++
16 ipc/util.c | 3 +++
17 kernel/exec_domain.c | 2 ++
18 kernel/irq/proc.c | 9 +++++++++
19 kernel/time/timer_list.c | 2 ++
20 mm/vmalloc.c | 2 ++
21 mm/vmstat.c | 8 +++++---
22 net/8021q/vlanproc.c | 6 ++++++
23 net/core/net-procfs.c | 18 ++++++++++++------
24 net/core/sock.c | 2 ++
25 net/ipv4/fib_trie.c | 18 ++++++++++++------
26 net/ipv4/proc.c | 3 +++
27 net/ipv4/route.c | 3 +++
28 20 files changed, 105 insertions(+), 17 deletions(-)
29
30 --- a/fs/locks.c
31 +++ b/fs/locks.c
32 @@ -2802,6 +2802,8 @@ static const struct file_operations proc
33
34 static int __init proc_locks_init(void)
35 {
36 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
37 + return 0;
38 proc_create("locks", 0, NULL, &proc_locks_operations);
39 return 0;
40 }
41 --- a/fs/proc/Kconfig
42 +++ b/fs/proc/Kconfig
43 @@ -81,3 +81,8 @@ config PROC_CHILDREN
44
45 Say Y if you are running any user-space software which takes benefit from
46 this interface. For example, rkt is such a piece of software.
47 +
48 +config PROC_STRIPPED
49 + default n
50 + depends on EXPERT
51 + bool "Strip non-essential /proc functionality to reduce code size"
52 --- a/fs/proc/consoles.c
53 +++ b/fs/proc/consoles.c
54 @@ -106,6 +106,9 @@ static const struct file_operations proc
55
56 static int __init proc_consoles_init(void)
57 {
58 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
59 + return 0;
60 +
61 proc_create("consoles", 0, NULL, &proc_consoles_operations);
62 return 0;
63 }
64 --- a/fs/proc/proc_tty.c
65 +++ b/fs/proc/proc_tty.c
66 @@ -144,7 +144,10 @@ static const struct file_operations proc
67 void proc_tty_register_driver(struct tty_driver *driver)
68 {
69 struct proc_dir_entry *ent;
70 -
71 +
72 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
73 + return;
74 +
75 if (!driver->driver_name || driver->proc_entry ||
76 !driver->ops->proc_fops)
77 return;
78 @@ -161,6 +164,9 @@ void proc_tty_unregister_driver(struct t
79 {
80 struct proc_dir_entry *ent;
81
82 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
83 + return;
84 +
85 ent = driver->proc_entry;
86 if (!ent)
87 return;
88 @@ -175,6 +181,9 @@ void proc_tty_unregister_driver(struct t
89 */
90 void __init proc_tty_init(void)
91 {
92 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
93 + return;
94 +
95 if (!proc_mkdir("tty", NULL))
96 return;
97 proc_mkdir("tty/ldisc", NULL); /* Preserved: it's userspace visible */
98 --- a/include/net/snmp.h
99 +++ b/include/net/snmp.h
100 @@ -123,6 +123,21 @@ struct linux_xfrm_mib {
101 #define DECLARE_SNMP_STAT(type, name) \
102 extern __typeof__(type) __percpu *name
103
104 +#ifdef CONFIG_PROC_STRIPPED
105 +#define __SNMP_STATS_DUMMY(mib) \
106 + do { (void) mib->mibs[0]; } while(0)
107 +
108 +#define __SNMP_INC_STATS(mib, field) __SNMP_STATS_DUMMY(mib)
109 +#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) __SNMP_STATS_DUMMY(mib)
110 +#define SNMP_INC_STATS(mib, field) __SNMP_STATS_DUMMY(mib)
111 +#define SNMP_DEC_STATS(mib, field) __SNMP_STATS_DUMMY(mib)
112 +#define __SNMP_ADD_STATS(mib, field, addend) __SNMP_STATS_DUMMY(mib)
113 +#define SNMP_ADD_STATS(mib, field, addend) __SNMP_STATS_DUMMY(mib)
114 +#define SNMP_UPD_PO_STATS(mib, basefield, addend) __SNMP_STATS_DUMMY(mib)
115 +#define __SNMP_UPD_PO_STATS(mib, basefield, addend) __SNMP_STATS_DUMMY(mib)
116 +
117 +#else
118 +
119 #define __SNMP_INC_STATS(mib, field) \
120 __this_cpu_inc(mib->mibs[field])
121
122 @@ -153,8 +168,9 @@ struct linux_xfrm_mib {
123 __this_cpu_add(ptr[basefield##OCTETS], addend); \
124 } while (0)
125
126 +#endif
127
128 -#if BITS_PER_LONG==32
129 +#if (BITS_PER_LONG==32) && !defined(CONFIG_PROC_STRIPPED)
130
131 #define __SNMP_ADD_STATS64(mib, field, addend) \
132 do { \
133 --- a/ipc/msg.c
134 +++ b/ipc/msg.c
135 @@ -1061,6 +1061,9 @@ void __init msg_init(void)
136 {
137 msg_init_ns(&init_ipc_ns);
138
139 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
140 + return;
141 +
142 ipc_init_proc_interface("sysvipc/msg",
143 " key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
144 IPC_MSG_IDS, sysvipc_msg_proc_show);
145 --- a/ipc/sem.c
146 +++ b/ipc/sem.c
147 @@ -205,6 +205,8 @@ void sem_exit_ns(struct ipc_namespace *n
148 void __init sem_init(void)
149 {
150 sem_init_ns(&init_ipc_ns);
151 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
152 + return;
153 ipc_init_proc_interface("sysvipc/sem",
154 " key semid perms nsems uid gid cuid cgid otime ctime\n",
155 IPC_SEM_IDS, sysvipc_sem_proc_show);
156 --- a/ipc/shm.c
157 +++ b/ipc/shm.c
158 @@ -118,6 +118,8 @@ pure_initcall(ipc_ns_init);
159
160 void __init shm_init(void)
161 {
162 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
163 + return;
164 ipc_init_proc_interface("sysvipc/shm",
165 #if BITS_PER_LONG <= 32
166 " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n",
167 --- a/ipc/util.c
168 +++ b/ipc/util.c
169 @@ -121,6 +121,9 @@ void __init ipc_init_proc_interface(cons
170 struct proc_dir_entry *pde;
171 struct ipc_proc_iface *iface;
172
173 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
174 + return;
175 +
176 iface = kmalloc(sizeof(*iface), GFP_KERNEL);
177 if (!iface)
178 return;
179 --- a/kernel/exec_domain.c
180 +++ b/kernel/exec_domain.c
181 @@ -41,6 +41,8 @@ static const struct file_operations exec
182
183 static int __init proc_execdomains_init(void)
184 {
185 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
186 + return 0;
187 proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
188 return 0;
189 }
190 --- a/kernel/irq/proc.c
191 +++ b/kernel/irq/proc.c
192 @@ -326,6 +326,9 @@ void register_irq_proc(unsigned int irq,
193 static DEFINE_MUTEX(register_lock);
194 char name [MAX_NAMELEN];
195
196 + if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
197 + return;
198 +
199 if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
200 return;
201
202 @@ -374,6 +377,9 @@ void unregister_irq_proc(unsigned int ir
203 {
204 char name [MAX_NAMELEN];
205
206 + if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
207 + return;
208 +
209 if (!root_irq_dir || !desc->dir)
210 return;
211 #ifdef CONFIG_SMP
212 @@ -408,6 +414,9 @@ void init_irq_proc(void)
213 unsigned int irq;
214 struct irq_desc *desc;
215
216 + if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
217 + return;
218 +
219 /* create /proc/irq */
220 root_irq_dir = proc_mkdir("irq", NULL);
221 if (!root_irq_dir)
222 --- a/kernel/time/timer_list.c
223 +++ b/kernel/time/timer_list.c
224 @@ -399,6 +399,8 @@ static int __init init_timer_list_procfs
225 {
226 struct proc_dir_entry *pe;
227
228 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
229 + return 0;
230 pe = proc_create("timer_list", 0444, NULL, &timer_list_fops);
231 if (!pe)
232 return -ENOMEM;
233 --- a/mm/vmalloc.c
234 +++ b/mm/vmalloc.c
235 @@ -2714,6 +2714,8 @@ static const struct file_operations proc
236
237 static int __init proc_vmalloc_init(void)
238 {
239 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
240 + return 0;
241 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
242 return 0;
243 }
244 --- a/mm/vmstat.c
245 +++ b/mm/vmstat.c
246 @@ -1798,10 +1798,12 @@ static int __init setup_vmstat(void)
247 cpu_notifier_register_done();
248 #endif
249 #ifdef CONFIG_PROC_FS
250 - proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
251 - proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
252 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
253 + proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
254 + proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
255 + proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
256 + }
257 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
258 - proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
259 #endif
260 return 0;
261 }
262 --- a/net/8021q/vlanproc.c
263 +++ b/net/8021q/vlanproc.c
264 @@ -127,6 +127,9 @@ void vlan_proc_cleanup(struct net *net)
265 {
266 struct vlan_net *vn = net_generic(net, vlan_net_id);
267
268 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
269 + return;
270 +
271 if (vn->proc_vlan_conf)
272 remove_proc_entry(name_conf, vn->proc_vlan_dir);
273
274 @@ -146,6 +149,9 @@ int __net_init vlan_proc_init(struct net
275 {
276 struct vlan_net *vn = net_generic(net, vlan_net_id);
277
278 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
279 + return 0;
280 +
281 vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
282 if (!vn->proc_vlan_dir)
283 goto err;
284 --- a/net/core/net-procfs.c
285 +++ b/net/core/net-procfs.c
286 @@ -319,10 +319,12 @@ static int __net_init dev_proc_net_init(
287
288 if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
289 goto out;
290 - if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
291 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
292 + !proc_create("softnet_stat", S_IRUGO, net->proc_net,
293 &softnet_seq_fops))
294 goto out_dev;
295 - if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
296 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
297 + !proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
298 goto out_softnet;
299
300 if (wext_proc_init(net))
301 @@ -331,9 +333,11 @@ static int __net_init dev_proc_net_init(
302 out:
303 return rc;
304 out_ptype:
305 - remove_proc_entry("ptype", net->proc_net);
306 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
307 + remove_proc_entry("ptype", net->proc_net);
308 out_softnet:
309 - remove_proc_entry("softnet_stat", net->proc_net);
310 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
311 + remove_proc_entry("softnet_stat", net->proc_net);
312 out_dev:
313 remove_proc_entry("dev", net->proc_net);
314 goto out;
315 @@ -343,8 +347,10 @@ static void __net_exit dev_proc_net_exit
316 {
317 wext_proc_exit(net);
318
319 - remove_proc_entry("ptype", net->proc_net);
320 - remove_proc_entry("softnet_stat", net->proc_net);
321 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
322 + remove_proc_entry("ptype", net->proc_net);
323 + remove_proc_entry("softnet_stat", net->proc_net);
324 + }
325 remove_proc_entry("dev", net->proc_net);
326 }
327
328 --- a/net/core/sock.c
329 +++ b/net/core/sock.c
330 @@ -3084,6 +3084,8 @@ static __net_initdata struct pernet_oper
331
332 static int __init proto_init(void)
333 {
334 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
335 + return 0;
336 return register_pernet_subsys(&proto_net_ops);
337 }
338
339 --- a/net/ipv4/fib_trie.c
340 +++ b/net/ipv4/fib_trie.c
341 @@ -2667,10 +2667,12 @@ static const struct file_operations fib_
342
343 int __net_init fib_proc_init(struct net *net)
344 {
345 - if (!proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops))
346 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
347 + !proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops))
348 goto out1;
349
350 - if (!proc_create("fib_triestat", S_IRUGO, net->proc_net,
351 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
352 + !proc_create("fib_triestat", S_IRUGO, net->proc_net,
353 &fib_triestat_fops))
354 goto out2;
355
356 @@ -2680,17 +2682,21 @@ int __net_init fib_proc_init(struct net
357 return 0;
358
359 out3:
360 - remove_proc_entry("fib_triestat", net->proc_net);
361 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
362 + remove_proc_entry("fib_triestat", net->proc_net);
363 out2:
364 - remove_proc_entry("fib_trie", net->proc_net);
365 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
366 + remove_proc_entry("fib_trie", net->proc_net);
367 out1:
368 return -ENOMEM;
369 }
370
371 void __net_exit fib_proc_exit(struct net *net)
372 {
373 - remove_proc_entry("fib_trie", net->proc_net);
374 - remove_proc_entry("fib_triestat", net->proc_net);
375 + if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
376 + remove_proc_entry("fib_trie", net->proc_net);
377 + remove_proc_entry("fib_triestat", net->proc_net);
378 + }
379 remove_proc_entry("route", net->proc_net);
380 }
381
382 --- a/net/ipv4/proc.c
383 +++ b/net/ipv4/proc.c
384 @@ -565,6 +565,9 @@ static __net_initdata struct pernet_oper
385
386 int __init ip_misc_proc_init(void)
387 {
388 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
389 + return 0;
390 +
391 return register_pernet_subsys(&ip_proc_ops);
392 }
393
394 --- a/net/ipv4/route.c
395 +++ b/net/ipv4/route.c
396 @@ -423,6 +423,9 @@ static struct pernet_operations ip_rt_pr
397
398 static int __init ip_rt_proc_init(void)
399 {
400 + if (IS_ENABLED(CONFIG_PROC_STRIPPED))
401 + return 0;
402 +
403 return register_pernet_subsys(&ip_rt_proc_ops);
404 }
405