mirror of https://gitee.com/openkylin/linux.git
2470 lines
58 KiB
C
2470 lines
58 KiB
C
/*
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* sysctl.c: General linux system control interface
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*
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* Begun 24 March 1995, Stephen Tweedie
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* Added /proc support, Dec 1995
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* Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
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* Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
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* Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
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* Dynamic registration fixes, Stephen Tweedie.
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* Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
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* Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
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* Horn.
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* Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
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* Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
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* Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
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* Wendling.
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* The list_for_each() macro wasn't appropriate for the sysctl loop.
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* Removed it and replaced it with older style, 03/23/00, Bill Wendling
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/ctype.h>
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#include <linux/utsname.h>
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#include <linux/capability.h>
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#include <linux/smp_lock.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/kobject.h>
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#include <linux/net.h>
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#include <linux/sysrq.h>
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#include <linux/highuid.h>
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#include <linux/writeback.h>
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#include <linux/hugetlb.h>
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#include <linux/security.h>
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#include <linux/initrd.h>
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#include <linux/times.h>
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#include <linux/limits.h>
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#include <linux/dcache.h>
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#include <linux/syscalls.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#ifdef CONFIG_ROOT_NFS
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#include <linux/nfs_fs.h>
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#endif
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#if defined(CONFIG_SYSCTL)
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/* External variables not in a header file. */
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extern int C_A_D;
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extern int sysctl_overcommit_memory;
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extern int sysctl_overcommit_ratio;
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extern int max_threads;
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extern int sysrq_enabled;
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extern int core_uses_pid;
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extern int suid_dumpable;
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extern char core_pattern[];
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extern int cad_pid;
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extern int pid_max;
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extern int min_free_kbytes;
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extern int printk_ratelimit_jiffies;
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extern int printk_ratelimit_burst;
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extern int pid_max_min, pid_max_max;
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extern int sysctl_drop_caches;
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extern int percpu_pagelist_fraction;
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#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
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int unknown_nmi_panic;
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extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
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void __user *, size_t *, loff_t *);
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#endif
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/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
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static int maxolduid = 65535;
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static int minolduid;
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static int min_percpu_pagelist_fract = 8;
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static int ngroups_max = NGROUPS_MAX;
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#ifdef CONFIG_KMOD
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extern char modprobe_path[];
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#endif
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#ifdef CONFIG_CHR_DEV_SG
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extern int sg_big_buff;
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#endif
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#ifdef CONFIG_SYSVIPC
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extern size_t shm_ctlmax;
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extern size_t shm_ctlall;
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extern int shm_ctlmni;
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extern int msg_ctlmax;
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extern int msg_ctlmnb;
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extern int msg_ctlmni;
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extern int sem_ctls[];
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#endif
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#ifdef __sparc__
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extern char reboot_command [];
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extern int stop_a_enabled;
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extern int scons_pwroff;
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#endif
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#ifdef __hppa__
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extern int pwrsw_enabled;
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extern int unaligned_enabled;
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#endif
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#ifdef CONFIG_S390
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#ifdef CONFIG_MATHEMU
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extern int sysctl_ieee_emulation_warnings;
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#endif
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extern int sysctl_userprocess_debug;
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extern int spin_retry;
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#endif
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extern int sysctl_hz_timer;
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#ifdef CONFIG_BSD_PROCESS_ACCT
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extern int acct_parm[];
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#endif
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int randomize_va_space = 1;
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static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
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ctl_table *, void **);
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static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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static ctl_table root_table[];
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static struct ctl_table_header root_table_header =
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{ root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
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static ctl_table kern_table[];
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static ctl_table vm_table[];
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static ctl_table proc_table[];
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static ctl_table fs_table[];
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static ctl_table debug_table[];
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static ctl_table dev_table[];
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extern ctl_table random_table[];
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#ifdef CONFIG_UNIX98_PTYS
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extern ctl_table pty_table[];
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#endif
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#ifdef CONFIG_INOTIFY
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extern ctl_table inotify_table[];
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#endif
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#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
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int sysctl_legacy_va_layout;
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#endif
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/* /proc declarations: */
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#ifdef CONFIG_PROC_FS
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static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
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static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
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static int proc_opensys(struct inode *, struct file *);
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struct file_operations proc_sys_file_operations = {
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.open = proc_opensys,
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.read = proc_readsys,
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.write = proc_writesys,
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};
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extern struct proc_dir_entry *proc_sys_root;
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static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
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static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
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#endif
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/* The default sysctl tables: */
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static ctl_table root_table[] = {
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{
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.ctl_name = CTL_KERN,
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.procname = "kernel",
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.mode = 0555,
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.child = kern_table,
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},
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{
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.ctl_name = CTL_VM,
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.procname = "vm",
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.mode = 0555,
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.child = vm_table,
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},
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#ifdef CONFIG_NET
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{
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.ctl_name = CTL_NET,
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.procname = "net",
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.mode = 0555,
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.child = net_table,
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},
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#endif
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{
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.ctl_name = CTL_PROC,
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.procname = "proc",
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.mode = 0555,
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.child = proc_table,
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},
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{
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.ctl_name = CTL_FS,
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.procname = "fs",
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.mode = 0555,
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.child = fs_table,
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},
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{
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.ctl_name = CTL_DEBUG,
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.procname = "debug",
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.mode = 0555,
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.child = debug_table,
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},
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{
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.ctl_name = CTL_DEV,
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.procname = "dev",
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.mode = 0555,
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.child = dev_table,
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},
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{ .ctl_name = 0 }
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};
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static ctl_table kern_table[] = {
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{
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.ctl_name = KERN_OSTYPE,
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.procname = "ostype",
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.data = system_utsname.sysname,
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.maxlen = sizeof(system_utsname.sysname),
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.mode = 0444,
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.proc_handler = &proc_doutsstring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_OSRELEASE,
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.procname = "osrelease",
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.data = system_utsname.release,
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.maxlen = sizeof(system_utsname.release),
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.mode = 0444,
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.proc_handler = &proc_doutsstring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_VERSION,
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.procname = "version",
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.data = system_utsname.version,
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.maxlen = sizeof(system_utsname.version),
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.mode = 0444,
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.proc_handler = &proc_doutsstring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_NODENAME,
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.procname = "hostname",
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.data = system_utsname.nodename,
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.maxlen = sizeof(system_utsname.nodename),
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.mode = 0644,
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.proc_handler = &proc_doutsstring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_DOMAINNAME,
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.procname = "domainname",
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.data = system_utsname.domainname,
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.maxlen = sizeof(system_utsname.domainname),
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.mode = 0644,
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.proc_handler = &proc_doutsstring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_PANIC,
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.procname = "panic",
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.data = &panic_timeout,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_CORE_USES_PID,
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.procname = "core_uses_pid",
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.data = &core_uses_pid,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_CORE_PATTERN,
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.procname = "core_pattern",
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.data = core_pattern,
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.maxlen = 64,
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.mode = 0644,
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.proc_handler = &proc_dostring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_TAINTED,
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.procname = "tainted",
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.data = &tainted,
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.maxlen = sizeof(int),
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.mode = 0444,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_CAP_BSET,
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.procname = "cap-bound",
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.data = &cap_bset,
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.maxlen = sizeof(kernel_cap_t),
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.mode = 0600,
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.proc_handler = &proc_dointvec_bset,
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},
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#ifdef CONFIG_BLK_DEV_INITRD
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{
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.ctl_name = KERN_REALROOTDEV,
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.procname = "real-root-dev",
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.data = &real_root_dev,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef __sparc__
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{
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.ctl_name = KERN_SPARC_REBOOT,
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.procname = "reboot-cmd",
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.data = reboot_command,
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.maxlen = 256,
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.mode = 0644,
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.proc_handler = &proc_dostring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_SPARC_STOP_A,
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.procname = "stop-a",
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.data = &stop_a_enabled,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_SPARC_SCONS_PWROFF,
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.procname = "scons-poweroff",
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.data = &scons_pwroff,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef __hppa__
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{
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.ctl_name = KERN_HPPA_PWRSW,
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.procname = "soft-power",
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.data = &pwrsw_enabled,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_HPPA_UNALIGNED,
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.procname = "unaligned-trap",
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.data = &unaligned_enabled,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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{
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.ctl_name = KERN_CTLALTDEL,
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.procname = "ctrl-alt-del",
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.data = &C_A_D,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_PRINTK,
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.procname = "printk",
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.data = &console_loglevel,
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.maxlen = 4*sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#ifdef CONFIG_KMOD
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{
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.ctl_name = KERN_MODPROBE,
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.procname = "modprobe",
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.data = &modprobe_path,
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.maxlen = KMOD_PATH_LEN,
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.mode = 0644,
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.proc_handler = &proc_dostring,
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.strategy = &sysctl_string,
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},
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#endif
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#ifdef CONFIG_HOTPLUG
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{
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.ctl_name = KERN_HOTPLUG,
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.procname = "hotplug",
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.data = &uevent_helper,
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.maxlen = UEVENT_HELPER_PATH_LEN,
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.mode = 0644,
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.proc_handler = &proc_dostring,
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.strategy = &sysctl_string,
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},
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#endif
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#ifdef CONFIG_CHR_DEV_SG
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{
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.ctl_name = KERN_SG_BIG_BUFF,
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.procname = "sg-big-buff",
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.data = &sg_big_buff,
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.maxlen = sizeof (int),
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.mode = 0444,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef CONFIG_BSD_PROCESS_ACCT
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{
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.ctl_name = KERN_ACCT,
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.procname = "acct",
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.data = &acct_parm,
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.maxlen = 3*sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef CONFIG_SYSVIPC
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{
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.ctl_name = KERN_SHMMAX,
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.procname = "shmmax",
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.data = &shm_ctlmax,
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.maxlen = sizeof (size_t),
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.mode = 0644,
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.proc_handler = &proc_doulongvec_minmax,
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},
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{
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.ctl_name = KERN_SHMALL,
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.procname = "shmall",
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.data = &shm_ctlall,
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.maxlen = sizeof (size_t),
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.mode = 0644,
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.proc_handler = &proc_doulongvec_minmax,
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},
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{
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.ctl_name = KERN_SHMMNI,
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.procname = "shmmni",
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.data = &shm_ctlmni,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_MSGMAX,
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.procname = "msgmax",
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.data = &msg_ctlmax,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_MSGMNI,
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.procname = "msgmni",
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.data = &msg_ctlmni,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_MSGMNB,
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.procname = "msgmnb",
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.data = &msg_ctlmnb,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_SEM,
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.procname = "sem",
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.data = &sem_ctls,
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.maxlen = 4*sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef CONFIG_MAGIC_SYSRQ
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{
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.ctl_name = KERN_SYSRQ,
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.procname = "sysrq",
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.data = &sysrq_enabled,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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{
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.ctl_name = KERN_CADPID,
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.procname = "cad_pid",
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.data = &cad_pid,
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.maxlen = sizeof (int),
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.mode = 0600,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_MAX_THREADS,
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.procname = "threads-max",
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.data = &max_threads,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_RANDOM,
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.procname = "random",
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.mode = 0555,
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.child = random_table,
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},
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#ifdef CONFIG_UNIX98_PTYS
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{
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.ctl_name = KERN_PTY,
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.procname = "pty",
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.mode = 0555,
|
|
.child = pty_table,
|
|
},
|
|
#endif
|
|
{
|
|
.ctl_name = KERN_OVERFLOWUID,
|
|
.procname = "overflowuid",
|
|
.data = &overflowuid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
{
|
|
.ctl_name = KERN_OVERFLOWGID,
|
|
.procname = "overflowgid",
|
|
.data = &overflowgid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
#ifdef CONFIG_S390
|
|
#ifdef CONFIG_MATHEMU
|
|
{
|
|
.ctl_name = KERN_IEEE_EMULATION_WARNINGS,
|
|
.procname = "ieee_emulation_warnings",
|
|
.data = &sysctl_ieee_emulation_warnings,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_NO_IDLE_HZ
|
|
{
|
|
.ctl_name = KERN_HZ_TIMER,
|
|
.procname = "hz_timer",
|
|
.data = &sysctl_hz_timer,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.ctl_name = KERN_S390_USER_DEBUG_LOGGING,
|
|
.procname = "userprocess_debug",
|
|
.data = &sysctl_userprocess_debug,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.ctl_name = KERN_PIDMAX,
|
|
.procname = "pid_max",
|
|
.data = &pid_max,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = sysctl_intvec,
|
|
.extra1 = &pid_max_min,
|
|
.extra2 = &pid_max_max,
|
|
},
|
|
{
|
|
.ctl_name = KERN_PANIC_ON_OOPS,
|
|
.procname = "panic_on_oops",
|
|
.data = &panic_on_oops,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = KERN_PRINTK_RATELIMIT,
|
|
.procname = "printk_ratelimit",
|
|
.data = &printk_ratelimit_jiffies,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = KERN_PRINTK_RATELIMIT_BURST,
|
|
.procname = "printk_ratelimit_burst",
|
|
.data = &printk_ratelimit_burst,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = KERN_NGROUPS_MAX,
|
|
.procname = "ngroups_max",
|
|
.data = &ngroups_max,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
|
|
{
|
|
.ctl_name = KERN_UNKNOWN_NMI_PANIC,
|
|
.procname = "unknown_nmi_panic",
|
|
.data = &unknown_nmi_panic,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_unknown_nmi_panic,
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_X86)
|
|
{
|
|
.ctl_name = KERN_BOOTLOADER_TYPE,
|
|
.procname = "bootloader_type",
|
|
.data = &bootloader_type,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.ctl_name = KERN_RANDOMIZE,
|
|
.procname = "randomize_va_space",
|
|
.data = &randomize_va_space,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#if defined(CONFIG_S390)
|
|
{
|
|
.ctl_name = KERN_SPIN_RETRY,
|
|
.procname = "spin_retry",
|
|
.data = &spin_retry,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
/* Constants for minimum and maximum testing in vm_table.
|
|
We use these as one-element integer vectors. */
|
|
static int zero;
|
|
static int one_hundred = 100;
|
|
|
|
|
|
static ctl_table vm_table[] = {
|
|
{
|
|
.ctl_name = VM_OVERCOMMIT_MEMORY,
|
|
.procname = "overcommit_memory",
|
|
.data = &sysctl_overcommit_memory,
|
|
.maxlen = sizeof(sysctl_overcommit_memory),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = VM_OVERCOMMIT_RATIO,
|
|
.procname = "overcommit_ratio",
|
|
.data = &sysctl_overcommit_ratio,
|
|
.maxlen = sizeof(sysctl_overcommit_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = VM_PAGE_CLUSTER,
|
|
.procname = "page-cluster",
|
|
.data = &page_cluster,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = VM_DIRTY_BACKGROUND,
|
|
.procname = "dirty_background_ratio",
|
|
.data = &dirty_background_ratio,
|
|
.maxlen = sizeof(dirty_background_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
{
|
|
.ctl_name = VM_DIRTY_RATIO,
|
|
.procname = "dirty_ratio",
|
|
.data = &vm_dirty_ratio,
|
|
.maxlen = sizeof(vm_dirty_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
{
|
|
.ctl_name = VM_DIRTY_WB_CS,
|
|
.procname = "dirty_writeback_centisecs",
|
|
.data = &dirty_writeback_centisecs,
|
|
.maxlen = sizeof(dirty_writeback_centisecs),
|
|
.mode = 0644,
|
|
.proc_handler = &dirty_writeback_centisecs_handler,
|
|
},
|
|
{
|
|
.ctl_name = VM_DIRTY_EXPIRE_CS,
|
|
.procname = "dirty_expire_centisecs",
|
|
.data = &dirty_expire_centisecs,
|
|
.maxlen = sizeof(dirty_expire_centisecs),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = VM_NR_PDFLUSH_THREADS,
|
|
.procname = "nr_pdflush_threads",
|
|
.data = &nr_pdflush_threads,
|
|
.maxlen = sizeof nr_pdflush_threads,
|
|
.mode = 0444 /* read-only*/,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = VM_SWAPPINESS,
|
|
.procname = "swappiness",
|
|
.data = &vm_swappiness,
|
|
.maxlen = sizeof(vm_swappiness),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
{
|
|
.ctl_name = VM_HUGETLB_PAGES,
|
|
.procname = "nr_hugepages",
|
|
.data = &max_huge_pages,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = &hugetlb_sysctl_handler,
|
|
.extra1 = (void *)&hugetlb_zero,
|
|
.extra2 = (void *)&hugetlb_infinity,
|
|
},
|
|
{
|
|
.ctl_name = VM_HUGETLB_GROUP,
|
|
.procname = "hugetlb_shm_group",
|
|
.data = &sysctl_hugetlb_shm_group,
|
|
.maxlen = sizeof(gid_t),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.ctl_name = VM_LOWMEM_RESERVE_RATIO,
|
|
.procname = "lowmem_reserve_ratio",
|
|
.data = &sysctl_lowmem_reserve_ratio,
|
|
.maxlen = sizeof(sysctl_lowmem_reserve_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = &lowmem_reserve_ratio_sysctl_handler,
|
|
.strategy = &sysctl_intvec,
|
|
},
|
|
{
|
|
.ctl_name = VM_DROP_PAGECACHE,
|
|
.procname = "drop_caches",
|
|
.data = &sysctl_drop_caches,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = drop_caches_sysctl_handler,
|
|
.strategy = &sysctl_intvec,
|
|
},
|
|
{
|
|
.ctl_name = VM_MIN_FREE_KBYTES,
|
|
.procname = "min_free_kbytes",
|
|
.data = &min_free_kbytes,
|
|
.maxlen = sizeof(min_free_kbytes),
|
|
.mode = 0644,
|
|
.proc_handler = &min_free_kbytes_sysctl_handler,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.ctl_name = VM_PERCPU_PAGELIST_FRACTION,
|
|
.procname = "percpu_pagelist_fraction",
|
|
.data = &percpu_pagelist_fraction,
|
|
.maxlen = sizeof(percpu_pagelist_fraction),
|
|
.mode = 0644,
|
|
.proc_handler = &percpu_pagelist_fraction_sysctl_handler,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &min_percpu_pagelist_fract,
|
|
},
|
|
#ifdef CONFIG_MMU
|
|
{
|
|
.ctl_name = VM_MAX_MAP_COUNT,
|
|
.procname = "max_map_count",
|
|
.data = &sysctl_max_map_count,
|
|
.maxlen = sizeof(sysctl_max_map_count),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec
|
|
},
|
|
#endif
|
|
{
|
|
.ctl_name = VM_LAPTOP_MODE,
|
|
.procname = "laptop_mode",
|
|
.data = &laptop_mode,
|
|
.maxlen = sizeof(laptop_mode),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.ctl_name = VM_BLOCK_DUMP,
|
|
.procname = "block_dump",
|
|
.data = &block_dump,
|
|
.maxlen = sizeof(block_dump),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.ctl_name = VM_VFS_CACHE_PRESSURE,
|
|
.procname = "vfs_cache_pressure",
|
|
.data = &sysctl_vfs_cache_pressure,
|
|
.maxlen = sizeof(sysctl_vfs_cache_pressure),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
},
|
|
#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
|
|
{
|
|
.ctl_name = VM_LEGACY_VA_LAYOUT,
|
|
.procname = "legacy_va_layout",
|
|
.data = &sysctl_legacy_va_layout,
|
|
.maxlen = sizeof(sysctl_legacy_va_layout),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SWAP
|
|
{
|
|
.ctl_name = VM_SWAP_TOKEN_TIMEOUT,
|
|
.procname = "swap_token_timeout",
|
|
.data = &swap_token_default_timeout,
|
|
.maxlen = sizeof(swap_token_default_timeout),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
#endif
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
static ctl_table proc_table[] = {
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
static ctl_table fs_table[] = {
|
|
{
|
|
.ctl_name = FS_NRINODE,
|
|
.procname = "inode-nr",
|
|
.data = &inodes_stat,
|
|
.maxlen = 2*sizeof(int),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = FS_STATINODE,
|
|
.procname = "inode-state",
|
|
.data = &inodes_stat,
|
|
.maxlen = 7*sizeof(int),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = FS_NRFILE,
|
|
.procname = "file-nr",
|
|
.data = &files_stat,
|
|
.maxlen = 3*sizeof(int),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = FS_MAXFILE,
|
|
.procname = "file-max",
|
|
.data = &files_stat.max_files,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = FS_DENTRY,
|
|
.procname = "dentry-state",
|
|
.data = &dentry_stat,
|
|
.maxlen = 6*sizeof(int),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = FS_OVERFLOWUID,
|
|
.procname = "overflowuid",
|
|
.data = &fs_overflowuid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
{
|
|
.ctl_name = FS_OVERFLOWGID,
|
|
.procname = "overflowgid",
|
|
.data = &fs_overflowgid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
{
|
|
.ctl_name = FS_LEASES,
|
|
.procname = "leases-enable",
|
|
.data = &leases_enable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#ifdef CONFIG_DNOTIFY
|
|
{
|
|
.ctl_name = FS_DIR_NOTIFY,
|
|
.procname = "dir-notify-enable",
|
|
.data = &dir_notify_enable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_MMU
|
|
{
|
|
.ctl_name = FS_LEASE_TIME,
|
|
.procname = "lease-break-time",
|
|
.data = &lease_break_time,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = FS_AIO_NR,
|
|
.procname = "aio-nr",
|
|
.data = &aio_nr,
|
|
.maxlen = sizeof(aio_nr),
|
|
.mode = 0444,
|
|
.proc_handler = &proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.ctl_name = FS_AIO_MAX_NR,
|
|
.procname = "aio-max-nr",
|
|
.data = &aio_max_nr,
|
|
.maxlen = sizeof(aio_max_nr),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_doulongvec_minmax,
|
|
},
|
|
#ifdef CONFIG_INOTIFY
|
|
{
|
|
.ctl_name = FS_INOTIFY,
|
|
.procname = "inotify",
|
|
.mode = 0555,
|
|
.child = inotify_table,
|
|
},
|
|
#endif
|
|
#endif
|
|
{
|
|
.ctl_name = KERN_SETUID_DUMPABLE,
|
|
.procname = "suid_dumpable",
|
|
.data = &suid_dumpable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
static ctl_table debug_table[] = {
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
static ctl_table dev_table[] = {
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
extern void init_irq_proc (void);
|
|
|
|
static DEFINE_SPINLOCK(sysctl_lock);
|
|
|
|
/* called under sysctl_lock */
|
|
static int use_table(struct ctl_table_header *p)
|
|
{
|
|
if (unlikely(p->unregistering))
|
|
return 0;
|
|
p->used++;
|
|
return 1;
|
|
}
|
|
|
|
/* called under sysctl_lock */
|
|
static void unuse_table(struct ctl_table_header *p)
|
|
{
|
|
if (!--p->used)
|
|
if (unlikely(p->unregistering))
|
|
complete(p->unregistering);
|
|
}
|
|
|
|
/* called under sysctl_lock, will reacquire if has to wait */
|
|
static void start_unregistering(struct ctl_table_header *p)
|
|
{
|
|
/*
|
|
* if p->used is 0, nobody will ever touch that entry again;
|
|
* we'll eliminate all paths to it before dropping sysctl_lock
|
|
*/
|
|
if (unlikely(p->used)) {
|
|
struct completion wait;
|
|
init_completion(&wait);
|
|
p->unregistering = &wait;
|
|
spin_unlock(&sysctl_lock);
|
|
wait_for_completion(&wait);
|
|
spin_lock(&sysctl_lock);
|
|
}
|
|
/*
|
|
* do not remove from the list until nobody holds it; walking the
|
|
* list in do_sysctl() relies on that.
|
|
*/
|
|
list_del_init(&p->ctl_entry);
|
|
}
|
|
|
|
void __init sysctl_init(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
register_proc_table(root_table, proc_sys_root, &root_table_header);
|
|
init_irq_proc();
|
|
#endif
|
|
}
|
|
|
|
int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
struct list_head *tmp;
|
|
int error = -ENOTDIR;
|
|
|
|
if (nlen <= 0 || nlen >= CTL_MAXNAME)
|
|
return -ENOTDIR;
|
|
if (oldval) {
|
|
int old_len;
|
|
if (!oldlenp || get_user(old_len, oldlenp))
|
|
return -EFAULT;
|
|
}
|
|
spin_lock(&sysctl_lock);
|
|
tmp = &root_table_header.ctl_entry;
|
|
do {
|
|
struct ctl_table_header *head =
|
|
list_entry(tmp, struct ctl_table_header, ctl_entry);
|
|
void *context = NULL;
|
|
|
|
if (!use_table(head))
|
|
continue;
|
|
|
|
spin_unlock(&sysctl_lock);
|
|
|
|
error = parse_table(name, nlen, oldval, oldlenp,
|
|
newval, newlen, head->ctl_table,
|
|
&context);
|
|
kfree(context);
|
|
|
|
spin_lock(&sysctl_lock);
|
|
unuse_table(head);
|
|
if (error != -ENOTDIR)
|
|
break;
|
|
} while ((tmp = tmp->next) != &root_table_header.ctl_entry);
|
|
spin_unlock(&sysctl_lock);
|
|
return error;
|
|
}
|
|
|
|
asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
|
|
{
|
|
struct __sysctl_args tmp;
|
|
int error;
|
|
|
|
if (copy_from_user(&tmp, args, sizeof(tmp)))
|
|
return -EFAULT;
|
|
|
|
lock_kernel();
|
|
error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
|
|
tmp.newval, tmp.newlen);
|
|
unlock_kernel();
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* ctl_perm does NOT grant the superuser all rights automatically, because
|
|
* some sysctl variables are readonly even to root.
|
|
*/
|
|
|
|
static int test_perm(int mode, int op)
|
|
{
|
|
if (!current->euid)
|
|
mode >>= 6;
|
|
else if (in_egroup_p(0))
|
|
mode >>= 3;
|
|
if ((mode & op & 0007) == op)
|
|
return 0;
|
|
return -EACCES;
|
|
}
|
|
|
|
static inline int ctl_perm(ctl_table *table, int op)
|
|
{
|
|
int error;
|
|
error = security_sysctl(table, op);
|
|
if (error)
|
|
return error;
|
|
return test_perm(table->mode, op);
|
|
}
|
|
|
|
static int parse_table(int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen,
|
|
ctl_table *table, void **context)
|
|
{
|
|
int n;
|
|
repeat:
|
|
if (!nlen)
|
|
return -ENOTDIR;
|
|
if (get_user(n, name))
|
|
return -EFAULT;
|
|
for ( ; table->ctl_name; table++) {
|
|
if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
|
|
int error;
|
|
if (table->child) {
|
|
if (ctl_perm(table, 001))
|
|
return -EPERM;
|
|
if (table->strategy) {
|
|
error = table->strategy(
|
|
table, name, nlen,
|
|
oldval, oldlenp,
|
|
newval, newlen, context);
|
|
if (error)
|
|
return error;
|
|
}
|
|
name++;
|
|
nlen--;
|
|
table = table->child;
|
|
goto repeat;
|
|
}
|
|
error = do_sysctl_strategy(table, name, nlen,
|
|
oldval, oldlenp,
|
|
newval, newlen, context);
|
|
return error;
|
|
}
|
|
}
|
|
return -ENOTDIR;
|
|
}
|
|
|
|
/* Perform the actual read/write of a sysctl table entry. */
|
|
int do_sysctl_strategy (ctl_table *table,
|
|
int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
int op = 0, rc;
|
|
size_t len;
|
|
|
|
if (oldval)
|
|
op |= 004;
|
|
if (newval)
|
|
op |= 002;
|
|
if (ctl_perm(table, op))
|
|
return -EPERM;
|
|
|
|
if (table->strategy) {
|
|
rc = table->strategy(table, name, nlen, oldval, oldlenp,
|
|
newval, newlen, context);
|
|
if (rc < 0)
|
|
return rc;
|
|
if (rc > 0)
|
|
return 0;
|
|
}
|
|
|
|
/* If there is no strategy routine, or if the strategy returns
|
|
* zero, proceed with automatic r/w */
|
|
if (table->data && table->maxlen) {
|
|
if (oldval && oldlenp) {
|
|
if (get_user(len, oldlenp))
|
|
return -EFAULT;
|
|
if (len) {
|
|
if (len > table->maxlen)
|
|
len = table->maxlen;
|
|
if(copy_to_user(oldval, table->data, len))
|
|
return -EFAULT;
|
|
if(put_user(len, oldlenp))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
if (newval && newlen) {
|
|
len = newlen;
|
|
if (len > table->maxlen)
|
|
len = table->maxlen;
|
|
if(copy_from_user(table->data, newval, len))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* register_sysctl_table - register a sysctl hierarchy
|
|
* @table: the top-level table structure
|
|
* @insert_at_head: whether the entry should be inserted in front or at the end
|
|
*
|
|
* Register a sysctl table hierarchy. @table should be a filled in ctl_table
|
|
* array. An entry with a ctl_name of 0 terminates the table.
|
|
*
|
|
* The members of the &ctl_table structure are used as follows:
|
|
*
|
|
* ctl_name - This is the numeric sysctl value used by sysctl(2). The number
|
|
* must be unique within that level of sysctl
|
|
*
|
|
* procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
|
|
* enter a sysctl file
|
|
*
|
|
* data - a pointer to data for use by proc_handler
|
|
*
|
|
* maxlen - the maximum size in bytes of the data
|
|
*
|
|
* mode - the file permissions for the /proc/sys file, and for sysctl(2)
|
|
*
|
|
* child - a pointer to the child sysctl table if this entry is a directory, or
|
|
* %NULL.
|
|
*
|
|
* proc_handler - the text handler routine (described below)
|
|
*
|
|
* strategy - the strategy routine (described below)
|
|
*
|
|
* de - for internal use by the sysctl routines
|
|
*
|
|
* extra1, extra2 - extra pointers usable by the proc handler routines
|
|
*
|
|
* Leaf nodes in the sysctl tree will be represented by a single file
|
|
* under /proc; non-leaf nodes will be represented by directories.
|
|
*
|
|
* sysctl(2) can automatically manage read and write requests through
|
|
* the sysctl table. The data and maxlen fields of the ctl_table
|
|
* struct enable minimal validation of the values being written to be
|
|
* performed, and the mode field allows minimal authentication.
|
|
*
|
|
* More sophisticated management can be enabled by the provision of a
|
|
* strategy routine with the table entry. This will be called before
|
|
* any automatic read or write of the data is performed.
|
|
*
|
|
* The strategy routine may return
|
|
*
|
|
* < 0 - Error occurred (error is passed to user process)
|
|
*
|
|
* 0 - OK - proceed with automatic read or write.
|
|
*
|
|
* > 0 - OK - read or write has been done by the strategy routine, so
|
|
* return immediately.
|
|
*
|
|
* There must be a proc_handler routine for any terminal nodes
|
|
* mirrored under /proc/sys (non-terminals are handled by a built-in
|
|
* directory handler). Several default handlers are available to
|
|
* cover common cases -
|
|
*
|
|
* proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
|
|
* proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
|
|
* proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
|
|
*
|
|
* It is the handler's job to read the input buffer from user memory
|
|
* and process it. The handler should return 0 on success.
|
|
*
|
|
* This routine returns %NULL on a failure to register, and a pointer
|
|
* to the table header on success.
|
|
*/
|
|
struct ctl_table_header *register_sysctl_table(ctl_table * table,
|
|
int insert_at_head)
|
|
{
|
|
struct ctl_table_header *tmp;
|
|
tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
|
|
if (!tmp)
|
|
return NULL;
|
|
tmp->ctl_table = table;
|
|
INIT_LIST_HEAD(&tmp->ctl_entry);
|
|
tmp->used = 0;
|
|
tmp->unregistering = NULL;
|
|
spin_lock(&sysctl_lock);
|
|
if (insert_at_head)
|
|
list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
|
|
else
|
|
list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
|
|
spin_unlock(&sysctl_lock);
|
|
#ifdef CONFIG_PROC_FS
|
|
register_proc_table(table, proc_sys_root, tmp);
|
|
#endif
|
|
return tmp;
|
|
}
|
|
|
|
/**
|
|
* unregister_sysctl_table - unregister a sysctl table hierarchy
|
|
* @header: the header returned from register_sysctl_table
|
|
*
|
|
* Unregisters the sysctl table and all children. proc entries may not
|
|
* actually be removed until they are no longer used by anyone.
|
|
*/
|
|
void unregister_sysctl_table(struct ctl_table_header * header)
|
|
{
|
|
might_sleep();
|
|
spin_lock(&sysctl_lock);
|
|
start_unregistering(header);
|
|
#ifdef CONFIG_PROC_FS
|
|
unregister_proc_table(header->ctl_table, proc_sys_root);
|
|
#endif
|
|
spin_unlock(&sysctl_lock);
|
|
kfree(header);
|
|
}
|
|
|
|
/*
|
|
* /proc/sys support
|
|
*/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/* Scan the sysctl entries in table and add them all into /proc */
|
|
static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
|
|
{
|
|
struct proc_dir_entry *de;
|
|
int len;
|
|
mode_t mode;
|
|
|
|
for (; table->ctl_name; table++) {
|
|
/* Can't do anything without a proc name. */
|
|
if (!table->procname)
|
|
continue;
|
|
/* Maybe we can't do anything with it... */
|
|
if (!table->proc_handler && !table->child) {
|
|
printk(KERN_WARNING "SYSCTL: Can't register %s\n",
|
|
table->procname);
|
|
continue;
|
|
}
|
|
|
|
len = strlen(table->procname);
|
|
mode = table->mode;
|
|
|
|
de = NULL;
|
|
if (table->proc_handler)
|
|
mode |= S_IFREG;
|
|
else {
|
|
mode |= S_IFDIR;
|
|
for (de = root->subdir; de; de = de->next) {
|
|
if (proc_match(len, table->procname, de))
|
|
break;
|
|
}
|
|
/* If the subdir exists already, de is non-NULL */
|
|
}
|
|
|
|
if (!de) {
|
|
de = create_proc_entry(table->procname, mode, root);
|
|
if (!de)
|
|
continue;
|
|
de->set = set;
|
|
de->data = (void *) table;
|
|
if (table->proc_handler)
|
|
de->proc_fops = &proc_sys_file_operations;
|
|
}
|
|
table->de = de;
|
|
if (de->mode & S_IFDIR)
|
|
register_proc_table(table->child, de, set);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unregister a /proc sysctl table and any subdirectories.
|
|
*/
|
|
static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
|
|
{
|
|
struct proc_dir_entry *de;
|
|
for (; table->ctl_name; table++) {
|
|
if (!(de = table->de))
|
|
continue;
|
|
if (de->mode & S_IFDIR) {
|
|
if (!table->child) {
|
|
printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
|
|
continue;
|
|
}
|
|
unregister_proc_table(table->child, de);
|
|
|
|
/* Don't unregister directories which still have entries.. */
|
|
if (de->subdir)
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* In any case, mark the entry as goner; we'll keep it
|
|
* around if it's busy, but we'll know to do nothing with
|
|
* its fields. We are under sysctl_lock here.
|
|
*/
|
|
de->data = NULL;
|
|
|
|
/* Don't unregister proc entries that are still being used.. */
|
|
if (atomic_read(&de->count))
|
|
continue;
|
|
|
|
table->de = NULL;
|
|
remove_proc_entry(table->procname, root);
|
|
}
|
|
}
|
|
|
|
static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
int op;
|
|
struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
|
|
struct ctl_table *table;
|
|
size_t res;
|
|
ssize_t error = -ENOTDIR;
|
|
|
|
spin_lock(&sysctl_lock);
|
|
if (de && de->data && use_table(de->set)) {
|
|
/*
|
|
* at that point we know that sysctl was not unregistered
|
|
* and won't be until we finish
|
|
*/
|
|
spin_unlock(&sysctl_lock);
|
|
table = (struct ctl_table *) de->data;
|
|
if (!table || !table->proc_handler)
|
|
goto out;
|
|
error = -EPERM;
|
|
op = (write ? 002 : 004);
|
|
if (ctl_perm(table, op))
|
|
goto out;
|
|
|
|
/* careful: calling conventions are nasty here */
|
|
res = count;
|
|
error = (*table->proc_handler)(table, write, file,
|
|
buf, &res, ppos);
|
|
if (!error)
|
|
error = res;
|
|
out:
|
|
spin_lock(&sysctl_lock);
|
|
unuse_table(de->set);
|
|
}
|
|
spin_unlock(&sysctl_lock);
|
|
return error;
|
|
}
|
|
|
|
static int proc_opensys(struct inode *inode, struct file *file)
|
|
{
|
|
if (file->f_mode & FMODE_WRITE) {
|
|
/*
|
|
* sysctl entries that are not writable,
|
|
* are _NOT_ writable, capabilities or not.
|
|
*/
|
|
if (!(inode->i_mode & S_IWUSR))
|
|
return -EPERM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t proc_readsys(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return do_rw_proc(0, file, buf, count, ppos);
|
|
}
|
|
|
|
static ssize_t proc_writesys(struct file * file, const char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return do_rw_proc(1, file, (char __user *) buf, count, ppos);
|
|
}
|
|
|
|
/**
|
|
* proc_dostring - read a string sysctl
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes a string from/to the user buffer. If the kernel
|
|
* buffer provided is not large enough to hold the string, the
|
|
* string is truncated. The copied string is %NULL-terminated.
|
|
* If the string is being read by the user process, it is copied
|
|
* and a newline '\n' is added. It is truncated if the buffer is
|
|
* not large enough.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dostring(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
size_t len;
|
|
char __user *p;
|
|
char c;
|
|
|
|
if (!table->data || !table->maxlen || !*lenp ||
|
|
(*ppos && !write)) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (write) {
|
|
len = 0;
|
|
p = buffer;
|
|
while (len < *lenp) {
|
|
if (get_user(c, p++))
|
|
return -EFAULT;
|
|
if (c == 0 || c == '\n')
|
|
break;
|
|
len++;
|
|
}
|
|
if (len >= table->maxlen)
|
|
len = table->maxlen-1;
|
|
if(copy_from_user(table->data, buffer, len))
|
|
return -EFAULT;
|
|
((char *) table->data)[len] = 0;
|
|
*ppos += *lenp;
|
|
} else {
|
|
len = strlen(table->data);
|
|
if (len > table->maxlen)
|
|
len = table->maxlen;
|
|
if (len > *lenp)
|
|
len = *lenp;
|
|
if (len)
|
|
if(copy_to_user(buffer, table->data, len))
|
|
return -EFAULT;
|
|
if (len < *lenp) {
|
|
if(put_user('\n', ((char __user *) buffer) + len))
|
|
return -EFAULT;
|
|
len++;
|
|
}
|
|
*lenp = len;
|
|
*ppos += len;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Special case of dostring for the UTS structure. This has locks
|
|
* to observe. Should this be in kernel/sys.c ????
|
|
*/
|
|
|
|
static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int r;
|
|
|
|
if (!write) {
|
|
down_read(&uts_sem);
|
|
r=proc_dostring(table,0,filp,buffer,lenp, ppos);
|
|
up_read(&uts_sem);
|
|
} else {
|
|
down_write(&uts_sem);
|
|
r=proc_dostring(table,1,filp,buffer,lenp, ppos);
|
|
up_write(&uts_sem);
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
*valp = *negp ? -*lvalp : *lvalp;
|
|
} else {
|
|
int val = *valp;
|
|
if (val < 0) {
|
|
*negp = -1;
|
|
*lvalp = (unsigned long)-val;
|
|
} else {
|
|
*negp = 0;
|
|
*lvalp = (unsigned long)val;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos,
|
|
int (*conv)(int *negp, unsigned long *lvalp, int *valp,
|
|
int write, void *data),
|
|
void *data)
|
|
{
|
|
#define TMPBUFLEN 21
|
|
int *i, vleft, first=1, neg, val;
|
|
unsigned long lval;
|
|
size_t left, len;
|
|
|
|
char buf[TMPBUFLEN], *p;
|
|
char __user *s = buffer;
|
|
|
|
if (!table->data || !table->maxlen || !*lenp ||
|
|
(*ppos && !write)) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
i = (int *) table->data;
|
|
vleft = table->maxlen / sizeof(*i);
|
|
left = *lenp;
|
|
|
|
if (!conv)
|
|
conv = do_proc_dointvec_conv;
|
|
|
|
for (; left && vleft--; i++, first=0) {
|
|
if (write) {
|
|
while (left) {
|
|
char c;
|
|
if (get_user(c, s))
|
|
return -EFAULT;
|
|
if (!isspace(c))
|
|
break;
|
|
left--;
|
|
s++;
|
|
}
|
|
if (!left)
|
|
break;
|
|
neg = 0;
|
|
len = left;
|
|
if (len > sizeof(buf) - 1)
|
|
len = sizeof(buf) - 1;
|
|
if (copy_from_user(buf, s, len))
|
|
return -EFAULT;
|
|
buf[len] = 0;
|
|
p = buf;
|
|
if (*p == '-' && left > 1) {
|
|
neg = 1;
|
|
left--, p++;
|
|
}
|
|
if (*p < '0' || *p > '9')
|
|
break;
|
|
|
|
lval = simple_strtoul(p, &p, 0);
|
|
|
|
len = p-buf;
|
|
if ((len < left) && *p && !isspace(*p))
|
|
break;
|
|
if (neg)
|
|
val = -val;
|
|
s += len;
|
|
left -= len;
|
|
|
|
if (conv(&neg, &lval, i, 1, data))
|
|
break;
|
|
} else {
|
|
p = buf;
|
|
if (!first)
|
|
*p++ = '\t';
|
|
|
|
if (conv(&neg, &lval, i, 0, data))
|
|
break;
|
|
|
|
sprintf(p, "%s%lu", neg ? "-" : "", lval);
|
|
len = strlen(buf);
|
|
if (len > left)
|
|
len = left;
|
|
if(copy_to_user(s, buf, len))
|
|
return -EFAULT;
|
|
left -= len;
|
|
s += len;
|
|
}
|
|
}
|
|
|
|
if (!write && !first && left) {
|
|
if(put_user('\n', s))
|
|
return -EFAULT;
|
|
left--, s++;
|
|
}
|
|
if (write) {
|
|
while (left) {
|
|
char c;
|
|
if (get_user(c, s++))
|
|
return -EFAULT;
|
|
if (!isspace(c))
|
|
break;
|
|
left--;
|
|
}
|
|
}
|
|
if (write && first)
|
|
return -EINVAL;
|
|
*lenp -= left;
|
|
*ppos += *lenp;
|
|
return 0;
|
|
#undef TMPBUFLEN
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec - read a vector of integers
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
|
|
NULL,NULL);
|
|
}
|
|
|
|
#define OP_SET 0
|
|
#define OP_AND 1
|
|
#define OP_OR 2
|
|
#define OP_MAX 3
|
|
#define OP_MIN 4
|
|
|
|
static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
int op = *(int *)data;
|
|
if (write) {
|
|
int val = *negp ? -*lvalp : *lvalp;
|
|
switch(op) {
|
|
case OP_SET: *valp = val; break;
|
|
case OP_AND: *valp &= val; break;
|
|
case OP_OR: *valp |= val; break;
|
|
case OP_MAX: if(*valp < val)
|
|
*valp = val;
|
|
break;
|
|
case OP_MIN: if(*valp > val)
|
|
*valp = val;
|
|
break;
|
|
}
|
|
} else {
|
|
int val = *valp;
|
|
if (val < 0) {
|
|
*negp = -1;
|
|
*lvalp = (unsigned long)-val;
|
|
} else {
|
|
*negp = 0;
|
|
*lvalp = (unsigned long)val;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* init may raise the set.
|
|
*/
|
|
|
|
int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int op;
|
|
|
|
if (!capable(CAP_SYS_MODULE)) {
|
|
return -EPERM;
|
|
}
|
|
|
|
op = (current->pid == 1) ? OP_SET : OP_AND;
|
|
return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
|
|
do_proc_dointvec_bset_conv,&op);
|
|
}
|
|
|
|
struct do_proc_dointvec_minmax_conv_param {
|
|
int *min;
|
|
int *max;
|
|
};
|
|
|
|
static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
struct do_proc_dointvec_minmax_conv_param *param = data;
|
|
if (write) {
|
|
int val = *negp ? -*lvalp : *lvalp;
|
|
if ((param->min && *param->min > val) ||
|
|
(param->max && *param->max < val))
|
|
return -EINVAL;
|
|
*valp = val;
|
|
} else {
|
|
int val = *valp;
|
|
if (val < 0) {
|
|
*negp = -1;
|
|
*lvalp = (unsigned long)-val;
|
|
} else {
|
|
*negp = 0;
|
|
*lvalp = (unsigned long)val;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_minmax - read a vector of integers with min/max values
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
*
|
|
* This routine will ensure the values are within the range specified by
|
|
* table->extra1 (min) and table->extra2 (max).
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct do_proc_dointvec_minmax_conv_param param = {
|
|
.min = (int *) table->extra1,
|
|
.max = (int *) table->extra2,
|
|
};
|
|
return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
|
|
do_proc_dointvec_minmax_conv, ¶m);
|
|
}
|
|
|
|
static int do_proc_doulongvec_minmax(ctl_table *table, int write,
|
|
struct file *filp,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos,
|
|
unsigned long convmul,
|
|
unsigned long convdiv)
|
|
{
|
|
#define TMPBUFLEN 21
|
|
unsigned long *i, *min, *max, val;
|
|
int vleft, first=1, neg;
|
|
size_t len, left;
|
|
char buf[TMPBUFLEN], *p;
|
|
char __user *s = buffer;
|
|
|
|
if (!table->data || !table->maxlen || !*lenp ||
|
|
(*ppos && !write)) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
i = (unsigned long *) table->data;
|
|
min = (unsigned long *) table->extra1;
|
|
max = (unsigned long *) table->extra2;
|
|
vleft = table->maxlen / sizeof(unsigned long);
|
|
left = *lenp;
|
|
|
|
for (; left && vleft--; i++, min++, max++, first=0) {
|
|
if (write) {
|
|
while (left) {
|
|
char c;
|
|
if (get_user(c, s))
|
|
return -EFAULT;
|
|
if (!isspace(c))
|
|
break;
|
|
left--;
|
|
s++;
|
|
}
|
|
if (!left)
|
|
break;
|
|
neg = 0;
|
|
len = left;
|
|
if (len > TMPBUFLEN-1)
|
|
len = TMPBUFLEN-1;
|
|
if (copy_from_user(buf, s, len))
|
|
return -EFAULT;
|
|
buf[len] = 0;
|
|
p = buf;
|
|
if (*p == '-' && left > 1) {
|
|
neg = 1;
|
|
left--, p++;
|
|
}
|
|
if (*p < '0' || *p > '9')
|
|
break;
|
|
val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
|
|
len = p-buf;
|
|
if ((len < left) && *p && !isspace(*p))
|
|
break;
|
|
if (neg)
|
|
val = -val;
|
|
s += len;
|
|
left -= len;
|
|
|
|
if(neg)
|
|
continue;
|
|
if ((min && val < *min) || (max && val > *max))
|
|
continue;
|
|
*i = val;
|
|
} else {
|
|
p = buf;
|
|
if (!first)
|
|
*p++ = '\t';
|
|
sprintf(p, "%lu", convdiv * (*i) / convmul);
|
|
len = strlen(buf);
|
|
if (len > left)
|
|
len = left;
|
|
if(copy_to_user(s, buf, len))
|
|
return -EFAULT;
|
|
left -= len;
|
|
s += len;
|
|
}
|
|
}
|
|
|
|
if (!write && !first && left) {
|
|
if(put_user('\n', s))
|
|
return -EFAULT;
|
|
left--, s++;
|
|
}
|
|
if (write) {
|
|
while (left) {
|
|
char c;
|
|
if (get_user(c, s++))
|
|
return -EFAULT;
|
|
if (!isspace(c))
|
|
break;
|
|
left--;
|
|
}
|
|
}
|
|
if (write && first)
|
|
return -EINVAL;
|
|
*lenp -= left;
|
|
*ppos += *lenp;
|
|
return 0;
|
|
#undef TMPBUFLEN
|
|
}
|
|
|
|
/**
|
|
* proc_doulongvec_minmax - read a vector of long integers with min/max values
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
*
|
|
* This routine will ensure the values are within the range specified by
|
|
* table->extra1 (min) and table->extra2 (max).
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
|
|
}
|
|
|
|
/**
|
|
* proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
|
* values from/to the user buffer, treated as an ASCII string. The values
|
|
* are treated as milliseconds, and converted to jiffies when they are stored.
|
|
*
|
|
* This routine will ensure the values are within the range specified by
|
|
* table->extra1 (min) and table->extra2 (max).
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
|
|
struct file *filp,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_doulongvec_minmax(table, write, filp, buffer,
|
|
lenp, ppos, HZ, 1000l);
|
|
}
|
|
|
|
|
|
static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
*valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
|
|
} else {
|
|
int val = *valp;
|
|
unsigned long lval;
|
|
if (val < 0) {
|
|
*negp = -1;
|
|
lval = (unsigned long)-val;
|
|
} else {
|
|
*negp = 0;
|
|
lval = (unsigned long)val;
|
|
}
|
|
*lvalp = lval / HZ;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
*valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
|
|
} else {
|
|
int val = *valp;
|
|
unsigned long lval;
|
|
if (val < 0) {
|
|
*negp = -1;
|
|
lval = (unsigned long)-val;
|
|
} else {
|
|
*negp = 0;
|
|
lval = (unsigned long)val;
|
|
}
|
|
*lvalp = jiffies_to_clock_t(lval);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
*valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
|
|
} else {
|
|
int val = *valp;
|
|
unsigned long lval;
|
|
if (val < 0) {
|
|
*negp = -1;
|
|
lval = (unsigned long)-val;
|
|
} else {
|
|
*negp = 0;
|
|
lval = (unsigned long)val;
|
|
}
|
|
*lvalp = jiffies_to_msecs(lval);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_jiffies - read a vector of integers as seconds
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
* The values read are assumed to be in seconds, and are converted into
|
|
* jiffies.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
|
|
do_proc_dointvec_jiffies_conv,NULL);
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: pointer to the file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
* The values read are assumed to be in 1/USER_HZ seconds, and
|
|
* are converted into jiffies.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
|
|
do_proc_dointvec_userhz_jiffies_conv,NULL);
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @filp: the file structure
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
* @ppos: the current position in the file
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
* The values read are assumed to be in 1/1000 seconds, and
|
|
* are converted into jiffies.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
|
|
do_proc_dointvec_ms_jiffies_conv, NULL);
|
|
}
|
|
|
|
#else /* CONFIG_PROC_FS */
|
|
|
|
int proc_dostring(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
|
|
struct file *filp,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
|
|
/*
|
|
* General sysctl support routines
|
|
*/
|
|
|
|
/* The generic string strategy routine: */
|
|
int sysctl_string(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
if (!table->data || !table->maxlen)
|
|
return -ENOTDIR;
|
|
|
|
if (oldval && oldlenp) {
|
|
size_t bufsize;
|
|
if (get_user(bufsize, oldlenp))
|
|
return -EFAULT;
|
|
if (bufsize) {
|
|
size_t len = strlen(table->data), copied;
|
|
|
|
/* This shouldn't trigger for a well-formed sysctl */
|
|
if (len > table->maxlen)
|
|
len = table->maxlen;
|
|
|
|
/* Copy up to a max of bufsize-1 bytes of the string */
|
|
copied = (len >= bufsize) ? bufsize - 1 : len;
|
|
|
|
if (copy_to_user(oldval, table->data, copied) ||
|
|
put_user(0, (char __user *)(oldval + copied)))
|
|
return -EFAULT;
|
|
if (put_user(len, oldlenp))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
if (newval && newlen) {
|
|
size_t len = newlen;
|
|
if (len > table->maxlen)
|
|
len = table->maxlen;
|
|
if(copy_from_user(table->data, newval, len))
|
|
return -EFAULT;
|
|
if (len == table->maxlen)
|
|
len--;
|
|
((char *) table->data)[len] = 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* This function makes sure that all of the integers in the vector
|
|
* are between the minimum and maximum values given in the arrays
|
|
* table->extra1 and table->extra2, respectively.
|
|
*/
|
|
int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
|
|
if (newval && newlen) {
|
|
int __user *vec = (int __user *) newval;
|
|
int *min = (int *) table->extra1;
|
|
int *max = (int *) table->extra2;
|
|
size_t length;
|
|
int i;
|
|
|
|
if (newlen % sizeof(int) != 0)
|
|
return -EINVAL;
|
|
|
|
if (!table->extra1 && !table->extra2)
|
|
return 0;
|
|
|
|
if (newlen > table->maxlen)
|
|
newlen = table->maxlen;
|
|
length = newlen / sizeof(int);
|
|
|
|
for (i = 0; i < length; i++) {
|
|
int value;
|
|
if (get_user(value, vec + i))
|
|
return -EFAULT;
|
|
if (min && value < min[i])
|
|
return -EINVAL;
|
|
if (max && value > max[i])
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Strategy function to convert jiffies to seconds */
|
|
int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
if (oldval) {
|
|
size_t olen;
|
|
if (oldlenp) {
|
|
if (get_user(olen, oldlenp))
|
|
return -EFAULT;
|
|
if (olen!=sizeof(int))
|
|
return -EINVAL;
|
|
}
|
|
if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
|
|
(oldlenp && put_user(sizeof(int),oldlenp)))
|
|
return -EFAULT;
|
|
}
|
|
if (newval && newlen) {
|
|
int new;
|
|
if (newlen != sizeof(int))
|
|
return -EINVAL;
|
|
if (get_user(new, (int __user *)newval))
|
|
return -EFAULT;
|
|
*(int *)(table->data) = new*HZ;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* Strategy function to convert jiffies to seconds */
|
|
int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
if (oldval) {
|
|
size_t olen;
|
|
if (oldlenp) {
|
|
if (get_user(olen, oldlenp))
|
|
return -EFAULT;
|
|
if (olen!=sizeof(int))
|
|
return -EINVAL;
|
|
}
|
|
if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
|
|
(oldlenp && put_user(sizeof(int),oldlenp)))
|
|
return -EFAULT;
|
|
}
|
|
if (newval && newlen) {
|
|
int new;
|
|
if (newlen != sizeof(int))
|
|
return -EINVAL;
|
|
if (get_user(new, (int __user *)newval))
|
|
return -EFAULT;
|
|
*(int *)(table->data) = msecs_to_jiffies(new);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#else /* CONFIG_SYSCTL */
|
|
|
|
|
|
asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_string(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen, void **context)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dostring(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
|
|
struct file *filp,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
struct ctl_table_header * register_sysctl_table(ctl_table * table,
|
|
int insert_at_head)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
void unregister_sysctl_table(struct ctl_table_header * table)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SYSCTL */
|
|
|
|
/*
|
|
* No sense putting this after each symbol definition, twice,
|
|
* exception granted :-)
|
|
*/
|
|
EXPORT_SYMBOL(proc_dointvec);
|
|
EXPORT_SYMBOL(proc_dointvec_jiffies);
|
|
EXPORT_SYMBOL(proc_dointvec_minmax);
|
|
EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
|
|
EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
|
|
EXPORT_SYMBOL(proc_dostring);
|
|
EXPORT_SYMBOL(proc_doulongvec_minmax);
|
|
EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
|
|
EXPORT_SYMBOL(register_sysctl_table);
|
|
EXPORT_SYMBOL(sysctl_intvec);
|
|
EXPORT_SYMBOL(sysctl_jiffies);
|
|
EXPORT_SYMBOL(sysctl_ms_jiffies);
|
|
EXPORT_SYMBOL(sysctl_string);
|
|
EXPORT_SYMBOL(unregister_sysctl_table);
|