/* * ioctl.c * * Copyright (C) 1995, 1996 by Volker Lendecke * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache * Modified 1998, 1999 Wolfram Pienkoss for NLS * */ #include <linux/capability.h> #include <linux/compat.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/ioctl.h> #include <linux/time.h> #include <linux/mm.h> #include <linux/mount.h> #include <linux/slab.h> #include <linux/highuid.h> #include <linux/vmalloc.h> #include <linux/sched.h> #include <asm/uaccess.h> #include "ncp_fs.h" /* maximum limit for ncp_objectname_ioctl */ #define NCP_OBJECT_NAME_MAX_LEN 4096 /* maximum limit for ncp_privatedata_ioctl */ #define NCP_PRIVATE_DATA_MAX_LEN 8192 /* maximum negotiable packet size */ #define NCP_PACKET_SIZE_INTERNAL 65536 static int ncp_get_fs_info(struct ncp_server * server, struct inode *inode, struct ncp_fs_info __user *arg) { struct ncp_fs_info info; if (copy_from_user(&info, arg, sizeof(info))) return -EFAULT; if (info.version != NCP_GET_FS_INFO_VERSION) { DPRINTK("info.version invalid: %d\n", info.version); return -EINVAL; } /* TODO: info.addr = server->m.serv_addr; */ SET_UID(info.mounted_uid, server->m.mounted_uid); info.connection = server->connection; info.buffer_size = server->buffer_size; info.volume_number = NCP_FINFO(inode)->volNumber; info.directory_id = NCP_FINFO(inode)->DosDirNum; if (copy_to_user(arg, &info, sizeof(info))) return -EFAULT; return 0; } static int ncp_get_fs_info_v2(struct ncp_server * server, struct inode *inode, struct ncp_fs_info_v2 __user * arg) { struct ncp_fs_info_v2 info2; if (copy_from_user(&info2, arg, sizeof(info2))) return -EFAULT; if (info2.version != NCP_GET_FS_INFO_VERSION_V2) { DPRINTK("info.version invalid: %d\n", info2.version); return -EINVAL; } info2.mounted_uid = server->m.mounted_uid; info2.connection = server->connection; info2.buffer_size = server->buffer_size; info2.volume_number = NCP_FINFO(inode)->volNumber; info2.directory_id = NCP_FINFO(inode)->DosDirNum; info2.dummy1 = info2.dummy2 = info2.dummy3 = 0; if (copy_to_user(arg, &info2, sizeof(info2))) return -EFAULT; return 0; } #ifdef CONFIG_COMPAT struct compat_ncp_objectname_ioctl { s32 auth_type; u32 object_name_len; compat_caddr_t object_name; /* a userspace data, in most cases user name */ }; struct compat_ncp_fs_info_v2 { s32 version; u32 mounted_uid; u32 connection; u32 buffer_size; u32 volume_number; u32 directory_id; u32 dummy1; u32 dummy2; u32 dummy3; }; struct compat_ncp_ioctl_request { u32 function; u32 size; compat_caddr_t data; }; struct compat_ncp_privatedata_ioctl { u32 len; compat_caddr_t data; /* ~1000 for NDS */ }; #define NCP_IOC_GET_FS_INFO_V2_32 _IOWR('n', 4, struct compat_ncp_fs_info_v2) #define NCP_IOC_NCPREQUEST_32 _IOR('n', 1, struct compat_ncp_ioctl_request) #define NCP_IOC_GETOBJECTNAME_32 _IOWR('n', 9, struct compat_ncp_objectname_ioctl) #define NCP_IOC_SETOBJECTNAME_32 _IOR('n', 9, struct compat_ncp_objectname_ioctl) #define NCP_IOC_GETPRIVATEDATA_32 _IOWR('n', 10, struct compat_ncp_privatedata_ioctl) #define NCP_IOC_SETPRIVATEDATA_32 _IOR('n', 10, struct compat_ncp_privatedata_ioctl) static int ncp_get_compat_fs_info_v2(struct ncp_server * server, struct inode *inode, struct compat_ncp_fs_info_v2 __user * arg) { struct compat_ncp_fs_info_v2 info2; if (copy_from_user(&info2, arg, sizeof(info2))) return -EFAULT; if (info2.version != NCP_GET_FS_INFO_VERSION_V2) { DPRINTK("info.version invalid: %d\n", info2.version); return -EINVAL; } info2.mounted_uid = server->m.mounted_uid; info2.connection = server->connection; info2.buffer_size = server->buffer_size; info2.volume_number = NCP_FINFO(inode)->volNumber; info2.directory_id = NCP_FINFO(inode)->DosDirNum; info2.dummy1 = info2.dummy2 = info2.dummy3 = 0; if (copy_to_user(arg, &info2, sizeof(info2))) return -EFAULT; return 0; } #endif #define NCP_IOC_GETMOUNTUID16 _IOW('n', 2, u16) #define NCP_IOC_GETMOUNTUID32 _IOW('n', 2, u32) #define NCP_IOC_GETMOUNTUID64 _IOW('n', 2, u64) #ifdef CONFIG_NCPFS_NLS /* Here we are select the iocharset and the codepage for NLS. * Thanks Petr Vandrovec for idea and many hints. */ static int ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg) { struct ncp_nls_ioctl user; struct nls_table *codepage; struct nls_table *iocharset; struct nls_table *oldset_io; struct nls_table *oldset_cp; int utf8; int err; if (copy_from_user(&user, arg, sizeof(user))) return -EFAULT; codepage = NULL; user.codepage[NCP_IOCSNAME_LEN] = 0; if (!user.codepage[0] || !strcmp(user.codepage, "default")) codepage = load_nls_default(); else { codepage = load_nls(user.codepage); if (!codepage) { return -EBADRQC; } } iocharset = NULL; user.iocharset[NCP_IOCSNAME_LEN] = 0; if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) { iocharset = load_nls_default(); utf8 = 0; } else if (!strcmp(user.iocharset, "utf8")) { iocharset = load_nls_default(); utf8 = 1; } else { iocharset = load_nls(user.iocharset); if (!iocharset) { unload_nls(codepage); return -EBADRQC; } utf8 = 0; } mutex_lock(&server->root_setup_lock); if (server->root_setuped) { oldset_cp = codepage; oldset_io = iocharset; err = -EBUSY; } else { if (utf8) NCP_SET_FLAG(server, NCP_FLAG_UTF8); else NCP_CLR_FLAG(server, NCP_FLAG_UTF8); oldset_cp = server->nls_vol; server->nls_vol = codepage; oldset_io = server->nls_io; server->nls_io = iocharset; err = 0; } mutex_unlock(&server->root_setup_lock); unload_nls(oldset_cp); unload_nls(oldset_io); return err; } static int ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg) { struct ncp_nls_ioctl user; int len; memset(&user, 0, sizeof(user)); mutex_lock(&server->root_setup_lock); if (server->nls_vol && server->nls_vol->charset) { len = strlen(server->nls_vol->charset); if (len > NCP_IOCSNAME_LEN) len = NCP_IOCSNAME_LEN; strncpy(user.codepage, server->nls_vol->charset, len); user.codepage[len] = 0; } if (NCP_IS_FLAG(server, NCP_FLAG_UTF8)) strcpy(user.iocharset, "utf8"); else if (server->nls_io && server->nls_io->charset) { len = strlen(server->nls_io->charset); if (len > NCP_IOCSNAME_LEN) len = NCP_IOCSNAME_LEN; strncpy(user.iocharset, server->nls_io->charset, len); user.iocharset[len] = 0; } mutex_unlock(&server->root_setup_lock); if (copy_to_user(arg, &user, sizeof(user))) return -EFAULT; return 0; } #endif /* CONFIG_NCPFS_NLS */ static long __ncp_ioctl(struct inode *inode, unsigned int cmd, unsigned long arg) { struct ncp_server *server = NCP_SERVER(inode); int result; struct ncp_ioctl_request request; char* bouncebuffer; void __user *argp = (void __user *)arg; switch (cmd) { #ifdef CONFIG_COMPAT case NCP_IOC_NCPREQUEST_32: #endif case NCP_IOC_NCPREQUEST: #ifdef CONFIG_COMPAT if (cmd == NCP_IOC_NCPREQUEST_32) { struct compat_ncp_ioctl_request request32; if (copy_from_user(&request32, argp, sizeof(request32))) return -EFAULT; request.function = request32.function; request.size = request32.size; request.data = compat_ptr(request32.data); } else #endif if (copy_from_user(&request, argp, sizeof(request))) return -EFAULT; if ((request.function > 255) || (request.size > NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) { return -EINVAL; } bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL); if (!bouncebuffer) return -ENOMEM; if (copy_from_user(bouncebuffer, request.data, request.size)) { vfree(bouncebuffer); return -EFAULT; } ncp_lock_server(server); /* FIXME: We hack around in the server's structures here to be able to use ncp_request */ server->has_subfunction = 0; server->current_size = request.size; memcpy(server->packet, bouncebuffer, request.size); result = ncp_request2(server, request.function, bouncebuffer, NCP_PACKET_SIZE_INTERNAL); if (result < 0) result = -EIO; else result = server->reply_size; ncp_unlock_server(server); DPRINTK("ncp_ioctl: copy %d bytes\n", result); if (result >= 0) if (copy_to_user(request.data, bouncebuffer, result)) result = -EFAULT; vfree(bouncebuffer); return result; case NCP_IOC_CONN_LOGGED_IN: if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE)) return -EINVAL; mutex_lock(&server->root_setup_lock); if (server->root_setuped) result = -EBUSY; else { result = ncp_conn_logged_in(inode->i_sb); if (result == 0) server->root_setuped = 1; } mutex_unlock(&server->root_setup_lock); return result; case NCP_IOC_GET_FS_INFO: return ncp_get_fs_info(server, inode, argp); case NCP_IOC_GET_FS_INFO_V2: return ncp_get_fs_info_v2(server, inode, argp); #ifdef CONFIG_COMPAT case NCP_IOC_GET_FS_INFO_V2_32: return ncp_get_compat_fs_info_v2(server, inode, argp); #endif /* we have too many combinations of CONFIG_COMPAT, * CONFIG_64BIT and CONFIG_UID16, so just handle * any of the possible ioctls */ case NCP_IOC_GETMOUNTUID16: { u16 uid; SET_UID(uid, server->m.mounted_uid); if (put_user(uid, (u16 __user *)argp)) return -EFAULT; return 0; } case NCP_IOC_GETMOUNTUID32: if (put_user(server->m.mounted_uid, (u32 __user *)argp)) return -EFAULT; return 0; case NCP_IOC_GETMOUNTUID64: if (put_user(server->m.mounted_uid, (u64 __user *)argp)) return -EFAULT; return 0; case NCP_IOC_GETROOT: { struct ncp_setroot_ioctl sr; result = -EACCES; mutex_lock(&server->root_setup_lock); if (server->m.mounted_vol[0]) { struct dentry* dentry = inode->i_sb->s_root; if (dentry) { struct inode* s_inode = dentry->d_inode; if (s_inode) { sr.volNumber = NCP_FINFO(s_inode)->volNumber; sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum; sr.namespace = server->name_space[sr.volNumber]; result = 0; } else DPRINTK("ncpfs: s_root->d_inode==NULL\n"); } else DPRINTK("ncpfs: s_root==NULL\n"); } else { sr.volNumber = -1; sr.namespace = 0; sr.dirEntNum = 0; result = 0; } mutex_unlock(&server->root_setup_lock); if (!result && copy_to_user(argp, &sr, sizeof(sr))) result = -EFAULT; return result; } case NCP_IOC_SETROOT: { struct ncp_setroot_ioctl sr; __u32 vnum; __le32 de; __le32 dosde; struct dentry* dentry; if (copy_from_user(&sr, argp, sizeof(sr))) return -EFAULT; mutex_lock(&server->root_setup_lock); if (server->root_setuped) result = -EBUSY; else { if (sr.volNumber < 0) { server->m.mounted_vol[0] = 0; vnum = NCP_NUMBER_OF_VOLUMES; de = 0; dosde = 0; result = 0; } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) { result = -EINVAL; } else if (ncp_mount_subdir(server, sr.volNumber, sr.namespace, sr.dirEntNum, &vnum, &de, &dosde)) { result = -ENOENT; } else result = 0; if (result == 0) { dentry = inode->i_sb->s_root; if (dentry) { struct inode* s_inode = dentry->d_inode; if (s_inode) { NCP_FINFO(s_inode)->volNumber = vnum; NCP_FINFO(s_inode)->dirEntNum = de; NCP_FINFO(s_inode)->DosDirNum = dosde; server->root_setuped = 1; } else { DPRINTK("ncpfs: s_root->d_inode==NULL\n"); result = -EIO; } } else { DPRINTK("ncpfs: s_root==NULL\n"); result = -EIO; } } result = 0; } mutex_unlock(&server->root_setup_lock); return result; } #ifdef CONFIG_NCPFS_PACKET_SIGNING case NCP_IOC_SIGN_INIT: { struct ncp_sign_init sign; if (argp) if (copy_from_user(&sign, argp, sizeof(sign))) return -EFAULT; ncp_lock_server(server); mutex_lock(&server->rcv.creq_mutex); if (argp) { if (server->sign_wanted) { memcpy(server->sign_root,sign.sign_root,8); memcpy(server->sign_last,sign.sign_last,16); server->sign_active = 1; } /* ignore when signatures not wanted */ } else { server->sign_active = 0; } mutex_unlock(&server->rcv.creq_mutex); ncp_unlock_server(server); return 0; } case NCP_IOC_SIGN_WANTED: { int state; ncp_lock_server(server); state = server->sign_wanted; ncp_unlock_server(server); if (put_user(state, (int __user *)argp)) return -EFAULT; return 0; } case NCP_IOC_SET_SIGN_WANTED: { int newstate; /* get only low 8 bits... */ if (get_user(newstate, (unsigned char __user *)argp)) return -EFAULT; result = 0; ncp_lock_server(server); if (server->sign_active) { /* cannot turn signatures OFF when active */ if (!newstate) result = -EINVAL; } else { server->sign_wanted = newstate != 0; } ncp_unlock_server(server); return result; } #endif /* CONFIG_NCPFS_PACKET_SIGNING */ #ifdef CONFIG_NCPFS_IOCTL_LOCKING case NCP_IOC_LOCKUNLOCK: { struct ncp_lock_ioctl rqdata; if (copy_from_user(&rqdata, argp, sizeof(rqdata))) return -EFAULT; if (rqdata.origin != 0) return -EINVAL; /* check for cmd */ switch (rqdata.cmd) { case NCP_LOCK_EX: case NCP_LOCK_SH: if (rqdata.timeout == 0) rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT; else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT) rqdata.timeout = NCP_LOCK_MAX_TIMEOUT; break; case NCP_LOCK_LOG: rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT; /* has no effect */ case NCP_LOCK_CLEAR: break; default: return -EINVAL; } /* locking needs both read and write access */ if ((result = ncp_make_open(inode, O_RDWR)) != 0) { return result; } result = -EISDIR; if (!S_ISREG(inode->i_mode)) goto outrel; if (rqdata.cmd == NCP_LOCK_CLEAR) { result = ncp_ClearPhysicalRecord(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle, rqdata.offset, rqdata.length); if (result > 0) result = 0; /* no such lock */ } else { int lockcmd; switch (rqdata.cmd) { case NCP_LOCK_EX: lockcmd=1; break; case NCP_LOCK_SH: lockcmd=3; break; default: lockcmd=0; break; } result = ncp_LogPhysicalRecord(NCP_SERVER(inode), NCP_FINFO(inode)->file_handle, lockcmd, rqdata.offset, rqdata.length, rqdata.timeout); if (result > 0) result = -EAGAIN; } outrel: ncp_inode_close(inode); return result; } #endif /* CONFIG_NCPFS_IOCTL_LOCKING */ #ifdef CONFIG_COMPAT case NCP_IOC_GETOBJECTNAME_32: { struct compat_ncp_objectname_ioctl user; size_t outl; if (copy_from_user(&user, argp, sizeof(user))) return -EFAULT; down_read(&server->auth_rwsem); user.auth_type = server->auth.auth_type; outl = user.object_name_len; user.object_name_len = server->auth.object_name_len; if (outl > user.object_name_len) outl = user.object_name_len; result = 0; if (outl) { if (copy_to_user(compat_ptr(user.object_name), server->auth.object_name, outl)) result = -EFAULT; } up_read(&server->auth_rwsem); if (!result && copy_to_user(argp, &user, sizeof(user))) result = -EFAULT; return result; } #endif case NCP_IOC_GETOBJECTNAME: { struct ncp_objectname_ioctl user; size_t outl; if (copy_from_user(&user, argp, sizeof(user))) return -EFAULT; down_read(&server->auth_rwsem); user.auth_type = server->auth.auth_type; outl = user.object_name_len; user.object_name_len = server->auth.object_name_len; if (outl > user.object_name_len) outl = user.object_name_len; result = 0; if (outl) { if (copy_to_user(user.object_name, server->auth.object_name, outl)) result = -EFAULT; } up_read(&server->auth_rwsem); if (!result && copy_to_user(argp, &user, sizeof(user))) result = -EFAULT; return result; } #ifdef CONFIG_COMPAT case NCP_IOC_SETOBJECTNAME_32: #endif case NCP_IOC_SETOBJECTNAME: { struct ncp_objectname_ioctl user; void* newname; void* oldname; size_t oldnamelen; void* oldprivate; size_t oldprivatelen; #ifdef CONFIG_COMPAT if (cmd == NCP_IOC_SETOBJECTNAME_32) { struct compat_ncp_objectname_ioctl user32; if (copy_from_user(&user32, argp, sizeof(user32))) return -EFAULT; user.auth_type = user32.auth_type; user.object_name_len = user32.object_name_len; user.object_name = compat_ptr(user32.object_name); } else #endif if (copy_from_user(&user, argp, sizeof(user))) return -EFAULT; if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN) return -ENOMEM; if (user.object_name_len) { newname = memdup_user(user.object_name, user.object_name_len); if (IS_ERR(newname)) return PTR_ERR(newname); } else { newname = NULL; } down_write(&server->auth_rwsem); oldname = server->auth.object_name; oldnamelen = server->auth.object_name_len; oldprivate = server->priv.data; oldprivatelen = server->priv.len; server->auth.auth_type = user.auth_type; server->auth.object_name_len = user.object_name_len; server->auth.object_name = newname; server->priv.len = 0; server->priv.data = NULL; up_write(&server->auth_rwsem); kfree(oldprivate); kfree(oldname); return 0; } #ifdef CONFIG_COMPAT case NCP_IOC_GETPRIVATEDATA_32: #endif case NCP_IOC_GETPRIVATEDATA: { struct ncp_privatedata_ioctl user; size_t outl; #ifdef CONFIG_COMPAT if (cmd == NCP_IOC_GETPRIVATEDATA_32) { struct compat_ncp_privatedata_ioctl user32; if (copy_from_user(&user32, argp, sizeof(user32))) return -EFAULT; user.len = user32.len; user.data = compat_ptr(user32.data); } else #endif if (copy_from_user(&user, argp, sizeof(user))) return -EFAULT; down_read(&server->auth_rwsem); outl = user.len; user.len = server->priv.len; if (outl > user.len) outl = user.len; result = 0; if (outl) { if (copy_to_user(user.data, server->priv.data, outl)) result = -EFAULT; } up_read(&server->auth_rwsem); if (result) return result; #ifdef CONFIG_COMPAT if (cmd == NCP_IOC_GETPRIVATEDATA_32) { struct compat_ncp_privatedata_ioctl user32; user32.len = user.len; user32.data = (unsigned long) user.data; if (copy_to_user(argp, &user32, sizeof(user32))) return -EFAULT; } else #endif if (copy_to_user(argp, &user, sizeof(user))) return -EFAULT; return 0; } #ifdef CONFIG_COMPAT case NCP_IOC_SETPRIVATEDATA_32: #endif case NCP_IOC_SETPRIVATEDATA: { struct ncp_privatedata_ioctl user; void* new; void* old; size_t oldlen; #ifdef CONFIG_COMPAT if (cmd == NCP_IOC_SETPRIVATEDATA_32) { struct compat_ncp_privatedata_ioctl user32; if (copy_from_user(&user32, argp, sizeof(user32))) return -EFAULT; user.len = user32.len; user.data = compat_ptr(user32.data); } else #endif if (copy_from_user(&user, argp, sizeof(user))) return -EFAULT; if (user.len > NCP_PRIVATE_DATA_MAX_LEN) return -ENOMEM; if (user.len) { new = memdup_user(user.data, user.len); if (IS_ERR(new)) return PTR_ERR(new); } else { new = NULL; } down_write(&server->auth_rwsem); old = server->priv.data; oldlen = server->priv.len; server->priv.len = user.len; server->priv.data = new; up_write(&server->auth_rwsem); kfree(old); return 0; } #ifdef CONFIG_NCPFS_NLS case NCP_IOC_SETCHARSETS: return ncp_set_charsets(server, argp); case NCP_IOC_GETCHARSETS: return ncp_get_charsets(server, argp); #endif /* CONFIG_NCPFS_NLS */ case NCP_IOC_SETDENTRYTTL: { u_int32_t user; if (copy_from_user(&user, argp, sizeof(user))) return -EFAULT; /* 20 secs at most... */ if (user > 20000) return -EINVAL; user = (user * HZ) / 1000; atomic_set(&server->dentry_ttl, user); return 0; } case NCP_IOC_GETDENTRYTTL: { u_int32_t user = (atomic_read(&server->dentry_ttl) * 1000) / HZ; if (copy_to_user(argp, &user, sizeof(user))) return -EFAULT; return 0; } } return -EINVAL; } long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = filp->f_dentry->d_inode; struct ncp_server *server = NCP_SERVER(inode); uid_t uid = current_uid(); int need_drop_write = 0; long ret; switch (cmd) { case NCP_IOC_SETCHARSETS: case NCP_IOC_CONN_LOGGED_IN: case NCP_IOC_SETROOT: if (!capable(CAP_SYS_ADMIN)) { ret = -EACCES; goto out; } break; } if (server->m.mounted_uid != uid) { switch (cmd) { /* * Only mount owner can issue these ioctls. Information * necessary to authenticate to other NDS servers are * stored here. */ case NCP_IOC_GETOBJECTNAME: case NCP_IOC_SETOBJECTNAME: case NCP_IOC_GETPRIVATEDATA: case NCP_IOC_SETPRIVATEDATA: #ifdef CONFIG_COMPAT case NCP_IOC_GETOBJECTNAME_32: case NCP_IOC_SETOBJECTNAME_32: case NCP_IOC_GETPRIVATEDATA_32: case NCP_IOC_SETPRIVATEDATA_32: #endif ret = -EACCES; goto out; /* * These require write access on the inode if user id * does not match. Note that they do not write to the * file... But old code did mnt_want_write, so I keep * it as is. Of course not for mountpoint owner, as * that breaks read-only mounts altogether as ncpmount * needs working NCP_IOC_NCPREQUEST and * NCP_IOC_GET_FS_INFO. Some of these codes (setdentryttl, * signinit, setsignwanted) should be probably restricted * to owner only, or even more to CAP_SYS_ADMIN). */ case NCP_IOC_GET_FS_INFO: case NCP_IOC_GET_FS_INFO_V2: case NCP_IOC_NCPREQUEST: case NCP_IOC_SETDENTRYTTL: case NCP_IOC_SIGN_INIT: case NCP_IOC_LOCKUNLOCK: case NCP_IOC_SET_SIGN_WANTED: #ifdef CONFIG_COMPAT case NCP_IOC_GET_FS_INFO_V2_32: case NCP_IOC_NCPREQUEST_32: #endif ret = mnt_want_write_file(filp); if (ret) goto out; need_drop_write = 1; ret = inode_permission(inode, MAY_WRITE); if (ret) goto outDropWrite; break; /* * Read access required. */ case NCP_IOC_GETMOUNTUID16: case NCP_IOC_GETMOUNTUID32: case NCP_IOC_GETMOUNTUID64: case NCP_IOC_GETROOT: case NCP_IOC_SIGN_WANTED: ret = inode_permission(inode, MAY_READ); if (ret) goto out; break; /* * Anybody can read these. */ case NCP_IOC_GETCHARSETS: case NCP_IOC_GETDENTRYTTL: default: /* Three codes below are protected by CAP_SYS_ADMIN above. */ case NCP_IOC_SETCHARSETS: case NCP_IOC_CONN_LOGGED_IN: case NCP_IOC_SETROOT: break; } } ret = __ncp_ioctl(inode, cmd, arg); outDropWrite: if (need_drop_write) mnt_drop_write_file(filp); out: return ret; } #ifdef CONFIG_COMPAT long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { long ret; arg = (unsigned long) compat_ptr(arg); ret = ncp_ioctl(file, cmd, arg); return ret; } #endif