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debloat: procfs

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Strip non-essential /proc functionality to reduce code size

Imported from openwrt

Signed-off-by: Naveen <133593113+elohim-etz@users.noreply.github.com>
This commit is contained in:
Felix Fietkau
2024-11-20 14:59:58 +08:00
committed by Ansh
parent 7c66b941a2
commit 16568926fc
20 changed files with 107 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
fs/locks.c
View File

@@ -2810,6 +2810,8 @@ static const struct file_operations proc_locks_operations = {
static int __init proc_locks_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
proc_create("locks", 0, NULL, &proc_locks_operations);
return 0;
}

5
fs/proc/Kconfig
View File

@@ -82,6 +82,11 @@ config PROC_CHILDREN
Say Y if you are running any user-space software which takes benefit from
this interface. For example, rkt is such a piece of software.
config PROC_STRIPPED
default n
depends on EXPERT
bool "Strip non-essential /proc functionality to reduce code size"
config PROC_UID
bool "Include /proc/uid/ files"
default y

3
fs/proc/consoles.c
View File

@@ -106,6 +106,9 @@ static const struct file_operations proc_consoles_operations = {
static int __init proc_consoles_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
proc_create("consoles", 0, NULL, &proc_consoles_operations);
return 0;
}

11
fs/proc/proc_tty.c
View File

@@ -145,7 +145,10 @@ static const struct file_operations proc_tty_drivers_operations = {
void proc_tty_register_driver(struct tty_driver *driver)
{
struct proc_dir_entry *ent;
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return;
if (!driver->driver_name || driver->proc_entry ||
!driver->ops->proc_fops)
return;
@@ -162,6 +165,9 @@ void proc_tty_unregister_driver(struct tty_driver *driver)
{
struct proc_dir_entry *ent;
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return;
ent = driver->proc_entry;
if (!ent)
return;
@@ -176,6 +182,9 @@ void proc_tty_unregister_driver(struct tty_driver *driver)
*/
void __init proc_tty_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return;
if (!proc_mkdir("tty", NULL))
return;
proc_mkdir("tty/ldisc", NULL); /* Preserved: it's userspace visible */

18
include/net/snmp.h
View File

@@ -123,6 +123,21 @@ struct linux_xfrm_mib {
#define DECLARE_SNMP_STAT(type, name) \
extern __typeof__(type) __percpu *name
#ifdef CONFIG_PROC_STRIPPED
#define __SNMP_STATS_DUMMY(mib) \
do { (void) mib->mibs[0]; } while(0)
#define __SNMP_INC_STATS(mib, field) __SNMP_STATS_DUMMY(mib)
#define SNMP_INC_STATS_ATOMIC_LONG(mib, field) __SNMP_STATS_DUMMY(mib)
#define SNMP_INC_STATS(mib, field) __SNMP_STATS_DUMMY(mib)
#define SNMP_DEC_STATS(mib, field) __SNMP_STATS_DUMMY(mib)
#define __SNMP_ADD_STATS(mib, field, addend) __SNMP_STATS_DUMMY(mib)
#define SNMP_ADD_STATS(mib, field, addend) __SNMP_STATS_DUMMY(mib)
#define SNMP_UPD_PO_STATS(mib, basefield, addend) __SNMP_STATS_DUMMY(mib)
#define __SNMP_UPD_PO_STATS(mib, basefield, addend) __SNMP_STATS_DUMMY(mib)
#else
#define __SNMP_INC_STATS(mib, field) \
__this_cpu_inc(mib->mibs[field])
@@ -153,8 +168,9 @@ struct linux_xfrm_mib {
__this_cpu_add(ptr[basefield##OCTETS], addend); \
} while (0)
#endif
#if BITS_PER_LONG==32
#if (BITS_PER_LONG==32) && !defined(CONFIG_PROC_STRIPPED)
#define __SNMP_ADD_STATS64(mib, field, addend) \
do { \

3
ipc/msg.c
View File

@@ -1208,6 +1208,9 @@ int __init msg_init(void)
{
const int err = msg_init_ns(&init_ipc_ns);
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return err;
ipc_init_proc_interface("sysvipc/msg",
" key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
IPC_MSG_IDS, sysvipc_msg_proc_show);

2
ipc/sem.c
View File

@@ -207,6 +207,8 @@ int __init sem_init(void)
{
const int err = sem_init_ns(&init_ipc_ns);
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return err;
ipc_init_proc_interface("sysvipc/sem",
" key semid perms nsems uid gid cuid cgid otime ctime\n",
IPC_SEM_IDS, sysvipc_sem_proc_show);

2
ipc/shm.c
View File

@@ -123,6 +123,8 @@ pure_initcall(ipc_ns_init);
void __init shm_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return;
ipc_init_proc_interface("sysvipc/shm",
#if BITS_PER_LONG <= 32
" key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n",

3
ipc/util.c
View File

@@ -141,6 +141,9 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
struct proc_dir_entry *pde;
struct ipc_proc_iface *iface;
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return;
iface = kmalloc(sizeof(*iface), GFP_KERNEL);
if (!iface)
return;

2
kernel/exec_domain.c
View File

@@ -42,6 +42,8 @@ static const struct file_operations execdomains_proc_fops = {
static int __init proc_execdomains_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
return 0;
}

9
kernel/irq/proc.c
View File

@@ -418,6 +418,9 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
void __maybe_unused *irqp = (void *)(unsigned long) irq;
char name [MAX_NAMELEN];
if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
return;
if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
return;
@@ -471,6 +474,9 @@ void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)
{
char name [MAX_NAMELEN];
if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
return;
if (!root_irq_dir || !desc->dir)
return;
#ifdef CONFIG_SMP
@@ -509,6 +515,9 @@ void init_irq_proc(void)
unsigned int irq;
struct irq_desc *desc;
if (IS_ENABLED(CONFIG_PROC_STRIPPED) && !IS_ENABLED(CONFIG_SMP))
return;
/* create /proc/irq */
root_irq_dir = proc_mkdir("irq", NULL);
if (!root_irq_dir)

3
kernel/time/timer_list.c
View File

@@ -390,6 +390,9 @@ static int __init init_timer_list_procfs(void)
{
struct proc_dir_entry *pe;
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
pe = proc_create("timer_list", 0400, NULL, &timer_list_fops);
if (!pe)
return -ENOMEM;

2
mm/vmalloc.c
View File

@@ -2883,6 +2883,8 @@ static const struct file_operations proc_vmalloc_operations = {
static int __init proc_vmalloc_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
return 0;
}

10
mm/vmstat.c
View File

@@ -1963,10 +1963,12 @@ void __init init_mm_internals(void)
start_shepherd_timer();
#endif
#ifdef CONFIG_PROC_FS
proc_create("buddyinfo", 0444, NULL, &buddyinfo_file_operations);
proc_create("pagetypeinfo", 0400, NULL, &pagetypeinfo_file_operations);
proc_create("vmstat", 0444, NULL, &vmstat_file_operations);
proc_create("zoneinfo", 0444, NULL, &zoneinfo_file_operations);
if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
proc_create("buddyinfo", 0444, NULL, &buddyinfo_file_operations);
proc_create("pagetypeinfo", 0400, NULL, &pagetypeinfo_file_operations);
proc_create("vmstat", 0444, NULL, &vmstat_file_operations);
proc_create("zoneinfo", 0444, NULL, &zoneinfo_file_operations);
}
#endif
}

6
net/8021q/vlanproc.c
View File

@@ -127,6 +127,9 @@ void vlan_proc_cleanup(struct net *net)
{
struct vlan_net *vn = net_generic(net, vlan_net_id);
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return;
if (vn->proc_vlan_conf)
remove_proc_entry(name_conf, vn->proc_vlan_dir);
@@ -146,6 +149,9 @@ int __net_init vlan_proc_init(struct net *net)
{
struct vlan_net *vn = net_generic(net, vlan_net_id);
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
if (!vn->proc_vlan_dir)
goto err;

18
net/core/net-procfs.c
View File

@@ -350,10 +350,12 @@ static int __net_init dev_proc_net_init(struct net *net)
if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
goto out;
if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
!proc_create("softnet_stat", S_IRUGO, net->proc_net,
&softnet_seq_fops))
goto out_dev;
if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
goto out_softnet;
if (wext_proc_init(net))
@@ -362,9 +364,11 @@ static int __net_init dev_proc_net_init(struct net *net)
out:
return rc;
out_ptype:
remove_proc_entry("ptype", net->proc_net);
if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
remove_proc_entry("ptype", net->proc_net);
out_softnet:
remove_proc_entry("softnet_stat", net->proc_net);
if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
remove_proc_entry("softnet_stat", net->proc_net);
out_dev:
remove_proc_entry("dev", net->proc_net);
goto out;
@@ -374,8 +378,10 @@ static void __net_exit dev_proc_net_exit(struct net *net)
{
wext_proc_exit(net);
remove_proc_entry("ptype", net->proc_net);
remove_proc_entry("softnet_stat", net->proc_net);
if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
remove_proc_entry("ptype", net->proc_net);
remove_proc_entry("softnet_stat", net->proc_net);
}
remove_proc_entry("dev", net->proc_net);
}

2
net/core/sock.c
View File

@@ -3469,6 +3469,8 @@ static __net_initdata struct pernet_operations proto_net_ops = {
static int __init proto_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
return register_pernet_subsys(&proto_net_ops);
}

18
net/ipv4/fib_trie.c
View File

@@ -2736,10 +2736,12 @@ static const struct file_operations fib_route_fops = {
int __net_init fib_proc_init(struct net *net)
{
if (!proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops))
if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
!proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops))
goto out1;
if (!proc_create("fib_triestat", S_IRUGO, net->proc_net,
if (!IS_ENABLED(CONFIG_PROC_STRIPPED) &&
!proc_create("fib_triestat", S_IRUGO, net->proc_net,
&fib_triestat_fops))
goto out2;
@@ -2749,17 +2751,21 @@ int __net_init fib_proc_init(struct net *net)
return 0;
out3:
remove_proc_entry("fib_triestat", net->proc_net);
if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
remove_proc_entry("fib_triestat", net->proc_net);
out2:
remove_proc_entry("fib_trie", net->proc_net);
if (!IS_ENABLED(CONFIG_PROC_STRIPPED))
remove_proc_entry("fib_trie", net->proc_net);
out1:
return -ENOMEM;
}
void __net_exit fib_proc_exit(struct net *net)
{
remove_proc_entry("fib_trie", net->proc_net);
remove_proc_entry("fib_triestat", net->proc_net);
if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) {
remove_proc_entry("fib_trie", net->proc_net);
remove_proc_entry("fib_triestat", net->proc_net);
}
remove_proc_entry("route", net->proc_net);
}

3
net/ipv4/proc.c
View File

@@ -561,6 +561,9 @@ static __net_initdata struct pernet_operations ip_proc_ops = {
int __init ip_misc_proc_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
return register_pernet_subsys(&ip_proc_ops);
}

3
net/ipv4/route.c
View File

@@ -433,6 +433,9 @@ static struct pernet_operations ip_rt_proc_ops __net_initdata = {
static int __init ip_rt_proc_init(void)
{
if (IS_ENABLED(CONFIG_PROC_STRIPPED))
return 0;
return register_pernet_subsys(&ip_rt_proc_ops);
}