From 9e3f1d0805b2d919904dd9a4ff0d956314cc3cba Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 8 Jul 2017 08:20:09 +0200 Subject: debloat: procfs Signed-off-by: Felix Fietkau --- fs/locks.c | 2 ++ fs/proc/Kconfig | 5 +++++ fs/proc/consoles.c | 3 +++ fs/proc/proc_tty.c | 11 ++++++++++- include/net/snmp.h | 18 +++++++++++++++++- ipc/msg.c | 3 +++ ipc/sem.c | 2 ++ ipc/shm.c | 2 ++ ipc/util.c | 3 +++ kernel/exec_domain.c | 2 ++ kernel/irq/proc.c | 9 +++++++++ kernel/time/timer_list.c | 2 ++ mm/vmalloc.c | 2 ++ mm/vmstat.c | 8 +++++--- net/8021q/vlanproc.c | 6 ++++++ net/core/net-procfs.c | 18 ++++++++++++------ net/core/sock.c | 2 ++ net/ipv4/fib_trie.c | 18 ++++++++++++------ net/ipv4/proc.c | 3 +++ net/ipv4/route.c | 3 +++ 20 files changed, 105 insertions(+), 17 deletions(-) --- a/fs/locks.c +++ b/fs/locks.c @@ -2812,6 +2812,8 @@ static const struct file_operations proc 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; } --- a/fs/proc/Kconfig +++ b/fs/proc/Kconfig @@ -81,3 +81,8 @@ 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" --- a/fs/proc/consoles.c +++ b/fs/proc/consoles.c @@ -106,6 +106,9 @@ static const struct file_operations proc 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; } --- a/fs/proc/proc_tty.c +++ b/fs/proc/proc_tty.c @@ -145,7 +145,10 @@ static const struct file_operations proc 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 t { 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 t */ 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 */ --- a/include/net/snmp.h +++ b/include/net/snmp.h @@ -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 { \ --- a/ipc/msg.c +++ b/ipc/msg.c @@ -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); --- a/ipc/sem.c +++ b/ipc/sem.c @@ -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); --- a/ipc/shm.c +++ b/ipc/shm.c @@ -122,6 +122,8 @@ 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", --- a/ipc/util.c +++ b/ipc/util.c @@ -141,6 +141,9 @@ void __init ipc_init_proc_interface(cons 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; --- a/kernel/exec_domain.c +++ b/kernel/exec_domain.c @@ -42,6 +42,8 @@ static const struct file_operations exec 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; } --- a/kernel/irq/proc.c +++ b/kernel/irq/proc.c @@ -396,6 +396,9 @@ void register_irq_proc(unsigned int irq, 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; @@ -449,6 +452,9 @@ void unregister_irq_proc(unsigned int ir { 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 @@ -487,6 +493,9 @@ 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) --- a/kernel/time/timer_list.c +++ b/kernel/time/timer_list.c @@ -390,6 +390,9 @@ static int __init init_timer_list_procfs { 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; --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2774,6 +2774,8 @@ static const struct file_operations proc 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; } --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1950,10 +1950,12 @@ 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", 0444, NULL, &pagetypeinfo_file_operations); + if (!IS_ENABLED(CONFIG_PROC_STRIPPED)) { + proc_create("buddyinfo", 0444, NULL, &buddyinfo_file_operations); + proc_create("pagetypeinfo", 0444, NULL, &pagetypeinfo_file_operations); + proc_create("zoneinfo", 0444, NULL, &zoneinfo_file_operations); + } proc_create("vmstat", 0444, NULL, &vmstat_file_operations); - proc_create("zoneinfo", 0444, NULL, &zoneinfo_file_operations); #endif } --- a/net/8021q/vlanproc.c +++ b/net/8021q/vlanproc.c @@ -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 { 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; --- a/net/core/net-procfs.c +++ b/net/core/net-procfs.c @@ -320,10 +320,12 @@ static int __net_init dev_proc_net_init( 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)) @@ -332,9 +334,11 @@ static int __net_init dev_proc_net_init( 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; @@ -344,8 +348,10 @@ static void __net_exit dev_proc_net_exit { 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); } --- a/net/core/sock.c +++ b/net/core/sock.c @@ -3379,6 +3379,8 @@ static __net_initdata struct pernet_oper static int __init proto_init(void) { + if (IS_ENABLED(CONFIG_PROC_STRIPPED)) + return 0; return register_pernet_subsys(&proto_net_ops); } --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -2740,10 +2740,12 @@ static const struct file_operations fib_ 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; @@ -2753,17 +2755,21 @@ int __net_init fib_proc_init(struct 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); } --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -559,6 +559,9 @@ static __net_initdata struct pernet_oper int __init ip_misc_proc_init(void) { + if (IS_ENABLED(CONFIG_PROC_STRIPPED)) + return 0; + return register_pernet_subsys(&ip_proc_ops); } --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -427,6 +427,9 @@ static struct pernet_operations ip_rt_pr static int __init ip_rt_proc_init(void) { + if (IS_ENABLED(CONFIG_PROC_STRIPPED)) + return 0; + return register_pernet_subsys(&ip_rt_proc_ops); }