/* * 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_ROOT_NFS #include #endif #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS) /* External variables not in a header file. */ extern int panic_timeout; extern int console_loglevel, C_A_D, swapout_interval; extern int bdf_prm[], bdflush_min[], bdflush_max[]; extern char binfmt_java_interpreter[], binfmt_java_appletviewer[]; extern int sysctl_overcommit_memory; #ifdef CONFIG_KMOD extern char modprobe_path[]; #endif #ifdef CONFIG_CHR_DEV_SG extern int sg_big_buff; #endif #ifdef __sparc__ extern char reboot_command []; #endif #ifdef __powerpc__ extern unsigned long htab_reclaim_on, zero_paged_on, powersave_nap; #endif extern int pgt_cache_water[]; static int parse_table(int *, int, void *, size_t *, void *, size_t, ctl_table *, void **); static int proc_doutsstring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp); static ctl_table root_table[]; static struct ctl_table_header root_table_header = {root_table, DNODE_SINGLE(&root_table_header)}; static ctl_table kern_table[]; static ctl_table vm_table[]; extern ctl_table net_table[]; static ctl_table proc_table[]; static ctl_table fs_table[]; static ctl_table debug_table[]; static ctl_table dev_table[]; /* /proc declarations: */ #ifdef CONFIG_PROC_FS static ssize_t proc_readsys(struct file *, char *, size_t, loff_t *); static ssize_t proc_writesys(struct file *, const char *, size_t, loff_t *); static int proc_sys_permission(struct inode *, int); struct file_operations proc_sys_file_operations = { NULL, /* lseek */ proc_readsys, /* read */ proc_writesys, /* write */ NULL, /* readdir */ NULL, /* poll */ NULL, /* ioctl */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* no special flush code */ NULL, /* no special release code */ NULL /* can't fsync */ }; struct inode_operations proc_sys_inode_operations = { &proc_sys_file_operations, NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ proc_sys_permission }; extern struct proc_dir_entry proc_sys_root; extern int inodes_stat[]; extern int dentry_stat[]; 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_KERN, "kernel", NULL, 0, 0555, kern_table}, {CTL_VM, "vm", NULL, 0, 0555, vm_table}, {CTL_NET, "net", NULL, 0, 0555, net_table}, {CTL_PROC, "proc", NULL, 0, 0555, proc_table}, {CTL_FS, "fs", NULL, 0, 0555, fs_table}, {CTL_DEBUG, "debug", NULL, 0, 0555, debug_table}, {CTL_DEV, "dev", NULL, 0, 0555, dev_table}, {0} }; static ctl_table kern_table[] = { {KERN_OSTYPE, "ostype", system_utsname.sysname, 64, 0444, NULL, &proc_doutsstring, &sysctl_string}, {KERN_OSRELEASE, "osrelease", system_utsname.release, 64, 0444, NULL, &proc_doutsstring, &sysctl_string}, {KERN_VERSION, "version", system_utsname.version, 64, 0444, NULL, &proc_doutsstring, &sysctl_string}, {KERN_NODENAME, "hostname", system_utsname.nodename, 64, 0644, NULL, &proc_doutsstring, &sysctl_string}, {KERN_DOMAINNAME, "domainname", system_utsname.domainname, 64, 0644, NULL, &proc_doutsstring, &sysctl_string}, {KERN_PANIC, "panic", &panic_timeout, sizeof(int), 0644, NULL, &proc_dointvec}, #ifdef CONFIG_BLK_DEV_INITRD {KERN_REALROOTDEV, "real-root-dev", &real_root_dev, sizeof(int), 0644, NULL, &proc_dointvec}, #endif #ifdef CONFIG_BINFMT_JAVA {KERN_JAVA_INTERPRETER, "java-interpreter", binfmt_java_interpreter, 64, 0644, NULL, &proc_dostring, &sysctl_string }, {KERN_JAVA_APPLETVIEWER, "java-appletviewer", binfmt_java_appletviewer, 64, 0644, NULL, &proc_dostring, &sysctl_string }, #endif #ifdef __sparc__ {KERN_SPARC_REBOOT, "reboot-cmd", reboot_command, 256, 0644, NULL, &proc_dostring, &sysctl_string }, #endif #ifdef __powerpc__ {KERN_PPC_HTABRECLAIM, "htab-reclaim", &htab_reclaim_on, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_PPC_ZEROPAGED, "zero-paged", &zero_paged_on, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_PPC_POWERSAVE_NAP, "powersave-nap", &powersave_nap, sizeof(int), 0644, NULL, &proc_dointvec}, #endif {KERN_CTLALTDEL, "ctrl-alt-del", &C_A_D, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_PRINTK, "printk", &console_loglevel, 4*sizeof(int), 0644, NULL, &proc_dointvec}, #ifdef CONFIG_KMOD {KERN_MODPROBE, "modprobe", &modprobe_path, 256, 0644, NULL, &proc_dostring, &sysctl_string }, #endif #ifdef CONFIG_CHR_DEV_SG {KERN_SG_BIG_BUFF, "sg-big-buff", &sg_big_buff, sizeof (int), 0444, NULL, &proc_dointvec}, #endif {0} }; static ctl_table vm_table[] = { {VM_SWAPCTL, "swapctl", &swap_control, sizeof(swap_control_t), 0644, NULL, &proc_dointvec}, {VM_SWAPOUT, "swapout_interval", &swapout_interval, sizeof(int), 0644, NULL, &proc_dointvec}, {VM_FREEPG, "freepages", &freepages, sizeof(freepages_t), 0644, NULL, &proc_dointvec}, {VM_BDFLUSH, "bdflush", &bdf_prm, 9*sizeof(int), 0600, NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL, &bdflush_min, &bdflush_max}, {VM_OVERCOMMIT_MEMORY, "overcommit_memory", &sysctl_overcommit_memory, sizeof(sysctl_overcommit_memory), 0644, NULL, &proc_dointvec}, {VM_BUFFERMEM, "buffermem", &buffer_mem, sizeof(buffer_mem_t), 0644, NULL, &proc_dointvec}, {VM_PAGECACHE, "pagecache", &page_cache, sizeof(buffer_mem_t), 0644, NULL, &proc_dointvec}, {VM_PAGERDAEMON, "kswapd", &pager_daemon, sizeof(pager_daemon_t), 0644, NULL, &proc_dointvec}, {VM_PGT_CACHE, "pagetable_cache", &pgt_cache_water, 2*sizeof(int), 0600, NULL, &proc_dointvec}, {0} }; static ctl_table proc_table[] = { {0} }; static ctl_table fs_table[] = { {FS_NRINODE, "inode-nr", &inodes_stat, 2*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_STATINODE, "inode-state", &inodes_stat, 7*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_MAXINODE, "inode-max", &max_inodes, sizeof(int), 0644, NULL, &proc_dointvec}, {FS_NRFILE, "file-nr", &nr_files, 3*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_MAXFILE, "file-max", &max_files, sizeof(int), 0644, NULL, &proc_dointvec}, {FS_NRSUPER, "super-nr", &nr_super_blocks, sizeof(int), 0444, NULL, &proc_dointvec}, {FS_MAXSUPER, "super-max", &max_super_blocks, sizeof(int), 0644, NULL, &proc_dointvec}, {FS_NRDQUOT, "dquot-nr", &nr_dquots, 2*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_MAXDQUOT, "dquot-max", &max_dquots, sizeof(int), 0644, NULL, &proc_dointvec}, {FS_DENTRY, "dentry-state", &dentry_stat, 6*sizeof(int), 0444, NULL, &proc_dointvec}, {0} }; static ctl_table debug_table[] = { {0} }; static ctl_table dev_table[] = { {0} }; void __init sysctl_init(void) { #ifdef CONFIG_PROC_FS register_proc_table(root_table, &proc_sys_root); #endif } int do_sysctl (int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen) { int error; struct ctl_table_header *tmp; void *context; if (nlen == 0 || nlen >= CTL_MAXNAME) return -ENOTDIR; if (oldval) { int old_len; if (!oldlenp) return -EFAULT; if(get_user(old_len, oldlenp)) return -EFAULT; } tmp = &root_table_header; do { context = NULL; error = parse_table(name, nlen, oldval, oldlenp, newval, newlen, tmp->ctl_table, &context); if (context) kfree(context); if (error != -ENOTDIR) return error; tmp = tmp->DLIST_NEXT(ctl_entry); } while (tmp != &root_table_header); return -ENOTDIR; } extern asmlinkage int sys_sysctl(struct __sysctl_args *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; } /* Like in_group_p, but testing against egid, not fsgid */ static int in_egroup_p(gid_t grp) { if (grp != current->egid) { int i = current->ngroups; if (i) { gid_t *groups = current->groups; do { if (*groups == grp) goto out; groups++; i--; } while (i); } return 0; } out: return 1; } /* 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) { return test_perm(table->mode, op); } static int parse_table(int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, ctl_table *table, void **context) { int error; repeat: if (!nlen) return -ENOTDIR; for ( ; table->ctl_name; table++) { int n; if(get_user(n,name)) return -EFAULT; if (n == table->ctl_name || table->ctl_name == CTL_ANY) { 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 *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { int op = 0, rc, 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) { get_user(len, oldlenp); 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; } struct ctl_table_header *register_sysctl_table(ctl_table * table, int insert_at_head) { struct ctl_table_header *tmp; tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); if (!tmp) return 0; *tmp = ((struct ctl_table_header) {table, DNODE_NULL}); if (insert_at_head) DLIST_INSERT_AFTER(&root_table_header, tmp, ctl_entry); else DLIST_INSERT_BEFORE(&root_table_header, tmp, ctl_entry); #ifdef CONFIG_PROC_FS register_proc_table(table, &proc_sys_root); #endif return tmp; } /* * Unlink and free a ctl_table. */ void unregister_sysctl_table(struct ctl_table_header * header) { DLIST_DELETE(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->ops = &proc_sys_inode_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 proc directories which still have entries... */ if (!((de->mode & S_IFDIR) && de->subdir)) { proc_unregister(root, de->low_ino); table->de = NULL; kfree(de); } } } static ssize_t do_rw_proc(int write, struct file * file, char * 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 = (struct proc_dir_entry*) file->f_dentry->d_inode->u.generic_ip; 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; /* * FIXME: we need to pass on ppos to the handler. */ error = (*table->proc_handler) (table, write, file, buf, &res); if (error) return error; return res; } static ssize_t proc_readsys(struct file * file, char * 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 * buf, size_t count, loff_t *ppos) { return do_rw_proc(1, file, (char *) buf, count, ppos); } static int proc_sys_permission(struct inode *inode, int op) { return test_perm(inode->i_mode, op); } int proc_dostring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { int len; char *p, c; if (!table->data || !table->maxlen || !*lenp || (filp->f_pos && !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; filp->f_pos += *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 *) buffer) + len)) return -EFAULT; len++; } *lenp = len; filp->f_pos += 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 *buffer, size_t *lenp) { int r; down(&uts_sem); r=proc_dostring(table,write,filp,buffer,lenp); up(&uts_sem); return r; } static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp, int conv) { int *i, vleft, first=1, len, left, neg, val; #define TMPBUFLEN 20 char buf[TMPBUFLEN], *p; if (!table->data || !table->maxlen || !*lenp || (filp->f_pos && !write)) { *lenp = 0; return 0; } i = (int *) table->data; vleft = table->maxlen / sizeof(int); left = *lenp; for (; left && vleft--; i++, first=0) { if (write) { while (left) { char c; if(get_user(c,(char *) buffer)) return -EFAULT; if (!isspace(c)) break; left--; ((char *) buffer)++; } if (!left) break; neg = 0; len = left; if (len > TMPBUFLEN-1) len = TMPBUFLEN-1; if(copy_from_user(buf, buffer, 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) * conv; len = p-buf; if ((len < left) && *p && !isspace(*p)) break; if (neg) val = -val; buffer += len; left -= len; *i = val; } else { p = buf; if (!first) *p++ = '\t'; sprintf(p, "%d", (*i) / conv); len = strlen(buf); if (len > left) len = left; if(copy_to_user(buffer, buf, len)) return -EFAULT; left -= len; buffer += len; } } if (!write && !first && left) { if(put_user('\n', (char *) buffer)) return -EFAULT; left--, buffer++; } if (write) { p = (char *) buffer; while (left) { char c; if(get_user(c, p++)) return -EFAULT; if (!isspace(c)) break; left--; } } if (write && first) return -EINVAL; *lenp -= left; filp->f_pos += *lenp; return 0; } int proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return do_proc_dointvec(table,write,filp,buffer,lenp,1); } int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { int *i, *min, *max, vleft, first=1, len, left, neg, val; #define TMPBUFLEN 20 char buf[TMPBUFLEN], *p; if (!table->data || !table->maxlen || !*lenp || (filp->f_pos && !write)) { *lenp = 0; return 0; } i = (int *) table->data; min = (int *) table->extra1; max = (int *) table->extra2; vleft = table->maxlen / sizeof(int); left = *lenp; for (; left && vleft--; i++, first=0) { if (write) { while (left) { char c; if(get_user(c, (char *) buffer)) return -EFAULT; if (!isspace(c)) break; left--; ((char *) buffer)++; } if (!left) break; neg = 0; len = left; if (len > TMPBUFLEN-1) len = TMPBUFLEN-1; if(copy_from_user(buf, buffer, 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); len = p-buf; if ((len < left) && *p && !isspace(*p)) break; if (neg) val = -val; buffer += len; left -= len; if (min && val < *min++) continue; if (max && val > *max++) continue; *i = val; } else { p = buf; if (!first) *p++ = '\t'; sprintf(p, "%d", *i); len = strlen(buf); if (len > left) len = left; if(copy_to_user(buffer, buf, len)) return -EFAULT; left -= len; buffer += len; } } if (!write && !first && left) { if(put_user('\n', (char *) buffer)) return -EFAULT; left--, buffer++; } if (write) { p = (char *) buffer; while (left) { char c; if(get_user(c, p++)) return -EFAULT; if (!isspace(c)) break; left--; } } if (write && first) return -EINVAL; *lenp -= left; filp->f_pos += *lenp; return 0; } /* Like proc_dointvec, but converts seconds to jiffies */ int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return do_proc_dointvec(table,write,filp,buffer,lenp,HZ); } #else /* CONFIG_PROC_FS */ int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dostring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } #endif /* CONFIG_PROC_FS */ /* * General sysctl support routines */ /* The generic string strategy routine: */ int sysctl_string(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { int 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 *) 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 *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { int i, length, *vec, *min, *max; if (newval && newlen) { 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); vec = (int *) newval; min = (int *) table->extra1; max = (int *) table->extra2; for (i = 0; i < length; i++) { int value; get_user(value, vec + i); if (min && value < min[i]) return -EINVAL; if (max && value > max[i]) return -EINVAL; } } return 0; } int do_string ( void *oldval, size_t *oldlenp, void *newval, size_t newlen, int rdwr, char *data, size_t max) { int l = strlen(data) + 1; if (newval && !rdwr) return -EPERM; if (newval && newlen >= max) return -EINVAL; if (oldval) { int old_l; if(get_user(old_l, oldlenp)) return -EFAULT; if (l > old_l) return -ENOMEM; if(put_user(l, oldlenp) || copy_to_user(oldval, data, l)) return -EFAULT; } if (newval) { if(copy_from_user(data, newval, newlen)) return -EFAULT; data[newlen] = 0; } return 0; } int do_int ( void *oldval, size_t *oldlenp, void *newval, size_t newlen, int rdwr, int *data) { if (newval && !rdwr) return -EPERM; if (newval && newlen != sizeof(int)) return -EINVAL; if (oldval) { int old_l; if(get_user(old_l, oldlenp)) return -EFAULT; if (old_l < sizeof(int)) return -ENOMEM; if(put_user(sizeof(int), oldlenp)||copy_to_user(oldval, data, sizeof(int))) return -EFAULT; } if (newval) if(copy_from_user(data, newval, sizeof(int))) return -EFAULT; return 0; } int do_struct ( void *oldval, size_t *oldlenp, void *newval, size_t newlen, int rdwr, void *data, size_t len) { if (newval && !rdwr) return -EPERM; if (newval && newlen != len) return -EINVAL; if (oldval) { int old_l; if(get_user(old_l, oldlenp)) return -EFAULT; if (old_l < len) return -ENOMEM; if(put_user(len, oldlenp) || copy_to_user(oldval, data, len)) return -EFAULT; } if (newval) if(copy_from_user(data, newval, len)) return -EFAULT; return 0; } #else /* CONFIG_PROC_FS && CONFIG_SYSCTL */ extern asmlinkage int sys_sysctl(struct __sysctl_args *args) { return -ENOSYS; } int sysctl_string(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { return -ENOSYS; } int sysctl_intvec(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { return -ENOSYS; } int proc_dostring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } struct ctl_table_header * register_sysctl_table(ctl_table * table, int insert_at_head) { return 0; } void unregister_sysctl_table(struct ctl_table_header * table) { } #endif /* CONFIG_PROC_FS && CONFIG_SYSCTL */