/* * sysctl.c: General linux system control interface * * Begun 24 March 1995, Stephen Tweedie * Added /proc support, Dec 1995 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. * Dynamic registration fixes, Stephen Tweedie. * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris * Horn. * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill * Wendling. * The list_for_each() macro wasn't appropriate for the sysctl loop. * Removed it and replaced it with older style, 03/23/00, Bill Wendling */ #include <linux/config.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/slab.h> #include <linux/sysctl.h> #include <linux/proc_fs.h> #include <linux/ctype.h> #include <linux/utsname.h> #include <linux/capability.h> #include <linux/smp_lock.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/sysrq.h> #include <linux/highuid.h> #include <linux/writeback.h> #include <linux/hugetlb.h> #include <linux/security.h> #include <linux/initrd.h> #include <linux/times.h> #include <linux/limits.h> #include <linux/dcache.h> #include <linux/syscalls.h> #include <asm/uaccess.h> #include <asm/processor.h> #ifdef CONFIG_ROOT_NFS #include <linux/nfs_fs.h> #endif #if defined(CONFIG_SYSCTL) /* External variables not in a header file. */ extern int C_A_D; extern int sysctl_overcommit_memory; extern int sysctl_overcommit_ratio; extern int max_threads; extern int sysrq_enabled; extern int core_uses_pid; extern int suid_dumpable; extern char core_pattern[]; extern int cad_pid; extern int pid_max; extern int min_free_kbytes; extern int printk_ratelimit_jiffies; extern int printk_ratelimit_burst; extern int pid_max_min, pid_max_max; #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) int unknown_nmi_panic; extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); #endif /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ static int maxolduid = 65535; static int minolduid; static int ngroups_max = NGROUPS_MAX; #ifdef CONFIG_KMOD extern char modprobe_path[]; #endif #ifdef CONFIG_HOTPLUG extern char hotplug_path[]; #endif #ifdef CONFIG_CHR_DEV_SG extern int sg_big_buff; #endif #ifdef CONFIG_SYSVIPC extern size_t shm_ctlmax; extern size_t shm_ctlall; extern int shm_ctlmni; extern int msg_ctlmax; extern int msg_ctlmnb; extern int msg_ctlmni; extern int sem_ctls[]; #endif #ifdef __sparc__ extern char reboot_command []; extern int stop_a_enabled; extern int scons_pwroff; #endif #ifdef __hppa__ extern int pwrsw_enabled; extern int unaligned_enabled; #endif #ifdef CONFIG_ARCH_S390 #ifdef CONFIG_MATHEMU extern int sysctl_ieee_emulation_warnings; #endif extern int sysctl_userprocess_debug; #endif extern int sysctl_hz_timer; #ifdef CONFIG_BSD_PROCESS_ACCT extern int acct_parm[]; #endif int randomize_va_space = 1; static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t, ctl_table *, void **); static int proc_doutsstring(ctl_table *table, int write, struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos); static ctl_table root_table[]; static struct ctl_table_header root_table_header = { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; static ctl_table kern_table[]; static ctl_table vm_table[]; #ifdef CONFIG_NET extern ctl_table net_table[]; #endif static ctl_table proc_table[]; static ctl_table fs_table[]; static ctl_table debug_table[]; static ctl_table dev_table[]; extern ctl_table random_table[]; #ifdef CONFIG_UNIX98_PTYS extern ctl_table pty_table[]; #endif #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT int sysctl_legacy_va_layout; #endif /* /proc declarations: */ #ifdef CONFIG_PROC_FS static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); static int proc_opensys(struct inode *, struct file *); struct file_operations proc_sys_file_operations = { .open = proc_opensys, .read = proc_readsys, .write = proc_writesys, }; extern struct proc_dir_entry *proc_sys_root; static void register_proc_table(ctl_table *, struct proc_dir_entry *); static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); #endif /* The default sysctl tables: */ static ctl_table root_table[] = { { .ctl_name = CTL_KERN, .procname = "kernel", .mode = 0555, .child = kern_table, }, { .ctl_name = CTL_VM, .procname = "vm", .mode = 0555, .child = vm_table, }, #ifdef CONFIG_NET { .ctl_name = CTL_NET, .procname = "net", .mode = 0555, .child = net_table, }, #endif { .ctl_name = CTL_PROC, .procname = "proc", .mode = 0555, .child = proc_table, }, { .ctl_name = CTL_FS, .procname = "fs", .mode = 0555, .child = fs_table, }, { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, .child = debug_table, }, { .ctl_name = CTL_DEV, .procname = "dev", .mode = 0555, .child = dev_table, }, { .ctl_name = 0 } }; static ctl_table kern_table[] = { { .ctl_name = KERN_OSTYPE, .procname = "ostype", .data = system_utsname.sysname, .maxlen = sizeof(system_utsname.sysname), .mode = 0444, .proc_handler = &proc_doutsstring, .strategy = &sysctl_string, }, { .ctl_name = KERN_OSRELEASE, .procname = "osrelease", .data = system_utsname.release, .maxlen = sizeof(system_utsname.release), .mode = 0444, .proc_handler = &proc_doutsstring, .strategy = &sysctl_string, }, { .ctl_name = KERN_VERSION, .procname = "version", .data = system_utsname.version, .maxlen = sizeof(system_utsname.version), .mode = 0444, .proc_handler = &proc_doutsstring, .strategy = &sysctl_string, }, { .ctl_name = KERN_NODENAME, .procname = "hostname", .data = system_utsname.nodename, .maxlen = sizeof(system_utsname.nodename), .mode = 0644, .proc_handler = &proc_doutsstring, .strategy = &sysctl_string, }, { .ctl_name = KERN_DOMAINNAME, .procname = "domainname", .data = system_utsname.domainname, .maxlen = sizeof(system_utsname.domainname), .mode = 0644, .proc_handler = &proc_doutsstring, .strategy = &sysctl_string, }, { .ctl_name = KERN_PANIC, .procname = "panic", .data = &panic_timeout, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_CORE_USES_PID, .procname = "core_uses_pid", .data = &core_uses_pid, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_CORE_PATTERN, .procname = "core_pattern", .data = core_pattern, .maxlen = 64, .mode = 0644, .proc_handler = &proc_dostring, .strategy = &sysctl_string, }, { .ctl_name = KERN_TAINTED, .procname = "tainted", .data = &tainted, .maxlen = sizeof(int), .mode = 0444, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_CAP_BSET, .procname = "cap-bound", .data = &cap_bset, .maxlen = sizeof(kernel_cap_t), .mode = 0600, .proc_handler = &proc_dointvec_bset, }, #ifdef CONFIG_BLK_DEV_INITRD { .ctl_name = KERN_REALROOTDEV, .procname = "real-root-dev", .data = &real_root_dev, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif #ifdef __sparc__ { .ctl_name = KERN_SPARC_REBOOT, .procname = "reboot-cmd", .data = reboot_command, .maxlen = 256, .mode = 0644, .proc_handler = &proc_dostring, .strategy = &sysctl_string, }, { .ctl_name = KERN_SPARC_STOP_A, .procname = "stop-a", .data = &stop_a_enabled, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_SPARC_SCONS_PWROFF, .procname = "scons-poweroff", .data = &scons_pwroff, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif #ifdef __hppa__ { .ctl_name = KERN_HPPA_PWRSW, .procname = "soft-power", .data = &pwrsw_enabled, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_HPPA_UNALIGNED, .procname = "unaligned-trap", .data = &unaligned_enabled, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif { .ctl_name = KERN_CTLALTDEL, .procname = "ctrl-alt-del", .data = &C_A_D, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_PRINTK, .procname = "printk", .data = &console_loglevel, .maxlen = 4*sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, #ifdef CONFIG_KMOD { .ctl_name = KERN_MODPROBE, .procname = "modprobe", .data = &modprobe_path, .maxlen = KMOD_PATH_LEN, .mode = 0644, .proc_handler = &proc_dostring, .strategy = &sysctl_string, }, #endif #ifdef CONFIG_HOTPLUG { .ctl_name = KERN_HOTPLUG, .procname = "hotplug", .data = &hotplug_path, .maxlen = HOTPLUG_PATH_LEN, .mode = 0644, .proc_handler = &proc_dostring, .strategy = &sysctl_string, }, #endif #ifdef CONFIG_CHR_DEV_SG { .ctl_name = KERN_SG_BIG_BUFF, .procname = "sg-big-buff", .data = &sg_big_buff, .maxlen = sizeof (int), .mode = 0444, .proc_handler = &proc_dointvec, }, #endif #ifdef CONFIG_BSD_PROCESS_ACCT { .ctl_name = KERN_ACCT, .procname = "acct", .data = &acct_parm, .maxlen = 3*sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif #ifdef CONFIG_SYSVIPC { .ctl_name = KERN_SHMMAX, .procname = "shmmax", .data = &shm_ctlmax, .maxlen = sizeof (size_t), .mode = 0644, .proc_handler = &proc_doulongvec_minmax, }, { .ctl_name = KERN_SHMALL, .procname = "shmall", .data = &shm_ctlall, .maxlen = sizeof (size_t), .mode = 0644, .proc_handler = &proc_doulongvec_minmax, }, { .ctl_name = KERN_SHMMNI, .procname = "shmmni", .data = &shm_ctlmni, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_MSGMAX, .procname = "msgmax", .data = &msg_ctlmax, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_MSGMNI, .procname = "msgmni", .data = &msg_ctlmni, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_MSGMNB, .procname = "msgmnb", .data = &msg_ctlmnb, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_SEM, .procname = "sem", .data = &sem_ctls, .maxlen = 4*sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif #ifdef CONFIG_MAGIC_SYSRQ { .ctl_name = KERN_SYSRQ, .procname = "sysrq", .data = &sysrq_enabled, .maxlen = sizeof (int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif { .ctl_name = KERN_CADPID, .procname = "cad_pid", .data = &cad_pid, .maxlen = sizeof (int), .mode = 0600, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_MAX_THREADS, .procname = "threads-max", .data = &max_threads, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = KERN_RANDOM, .procname = "random", .mode = 0555, .child = random_table, }, #ifdef CONFIG_UNIX98_PTYS { .ctl_name = KERN_PTY, .procname = "pty", .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_ARCH_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, }, { .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_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, }, #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_dointvec, }, { .ctl_name = FS_AIO_MAX_NR, .procname = "aio-max-nr", .data = &aio_max_nr, .maxlen = sizeof(aio_max_nr), .mode = 0644, .proc_handler = &proc_dointvec, }, #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); void __init sysctl_init(void) { #ifdef CONFIG_PROC_FS register_proc_table(root_table, proc_sys_root); 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; if (nlen <= 0 || nlen >= CTL_MAXNAME) return -ENOTDIR; if (oldval) { int old_len; if (!oldlenp || get_user(old_len, oldlenp)) return -EFAULT; } tmp = &root_table_header.ctl_entry; do { struct ctl_table_header *head = list_entry(tmp, struct ctl_table_header, ctl_entry); void *context = NULL; int error = parse_table(name, nlen, oldval, oldlenp, newval, newlen, head->ctl_table, &context); kfree(context); if (error != -ENOTDIR) return error; tmp = tmp->next; } while (tmp != &root_table_header.ctl_entry); return -ENOTDIR; } 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); 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); #ifdef CONFIG_PROC_FS register_proc_table(table, proc_sys_root); #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) { list_del(&header->ctl_entry); #ifdef CONFIG_PROC_FS unregister_proc_table(header->ctl_table, proc_sys_root); #endif 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) { 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->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); } } /* * 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; } /* 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; struct ctl_table *table; size_t res; ssize_t error; de = PDE(file->f_dentry->d_inode); if (!de || !de->data) return -ENOTDIR; table = (struct ctl_table *) de->data; if (!table || !table->proc_handler) return -ENOTDIR; op = (write ? 002 : 004); if (ctl_perm(table, op)) return -EPERM; res = count; error = (*table->proc_handler) (table, write, file, buf, &res, ppos); if (error) return error; return res; } 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 * * 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) { size_t l, len; if (!table->data || !table->maxlen) return -ENOTDIR; if (oldval && oldlenp) { if (get_user(len, oldlenp)) return -EFAULT; if (len) { l = strlen(table->data); if (len > l) len = l; if (len >= table->maxlen) len = table->maxlen; if(copy_to_user(oldval, table->data, len)) return -EFAULT; if(put_user(0, ((char __user *) oldval) + 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; if (len == table->maxlen) len--; ((char *) table->data)[len] = 0; } return 0; } /* * 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);