/* * linux/fs/compat.c * * Kernel compatibililty routines for e.g. 32 bit syscall support * on 64 bit kernels. * * Copyright (C) 2002 Stephen Rothwell, IBM Corporation * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com) * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs * Copyright (C) 2003 Pavel Machek (pavel@suse.cz) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/linkage.h> #include <linux/compat.h> #include <linux/errno.h> #include <linux/time.h> #include <linux/fs.h> #include <linux/fcntl.h> #include <linux/namei.h> #include <linux/file.h> #include <linux/vfs.h> #include <linux/ioctl32.h> #include <linux/ioctl.h> #include <linux/init.h> #include <linux/sockios.h> /* for SIOCDEVPRIVATE */ #include <linux/smb.h> #include <linux/smb_mount.h> #include <linux/ncp_mount.h> #include <linux/nfs4_mount.h> #include <linux/smp_lock.h> #include <linux/syscalls.h> #include <linux/ctype.h> #include <linux/module.h> #include <linux/dirent.h> #include <linux/fsnotify.h> #include <linux/highuid.h> #include <linux/sunrpc/svc.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/syscall.h> #include <linux/personality.h> #include <linux/rwsem.h> #include <linux/acct.h> #include <linux/mm.h> #include <net/sock.h> /* siocdevprivate_ioctl */ #include <asm/uaccess.h> #include <asm/mmu_context.h> #include <asm/ioctls.h> /* * Not all architectures have sys_utime, so implement this in terms * of sys_utimes. */ asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t) { struct timeval tv[2]; if (t) { if (get_user(tv[0].tv_sec, &t->actime) || get_user(tv[1].tv_sec, &t->modtime)) return -EFAULT; tv[0].tv_usec = 0; tv[1].tv_usec = 0; } return do_utimes(filename, t ? tv : NULL); } asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t) { struct timeval tv[2]; if (t) { if (get_user(tv[0].tv_sec, &t[0].tv_sec) || get_user(tv[0].tv_usec, &t[0].tv_usec) || get_user(tv[1].tv_sec, &t[1].tv_sec) || get_user(tv[1].tv_usec, &t[1].tv_usec)) return -EFAULT; } return do_utimes(filename, t ? tv : NULL); } asmlinkage long compat_sys_newstat(char __user * filename, struct compat_stat __user *statbuf) { struct kstat stat; int error = vfs_stat(filename, &stat); if (!error) error = cp_compat_stat(&stat, statbuf); return error; } asmlinkage long compat_sys_newlstat(char __user * filename, struct compat_stat __user *statbuf) { struct kstat stat; int error = vfs_lstat(filename, &stat); if (!error) error = cp_compat_stat(&stat, statbuf); return error; } asmlinkage long compat_sys_newfstat(unsigned int fd, struct compat_stat __user * statbuf) { struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_compat_stat(&stat, statbuf); return error; } static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) { if (sizeof ubuf->f_blocks == 4) { if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) & 0xffffffff00000000ULL) return -EOVERFLOW; /* f_files and f_ffree may be -1; it's okay * to stuff that into 32 bits */ if (kbuf->f_files != 0xffffffffffffffffULL && (kbuf->f_files & 0xffffffff00000000ULL)) return -EOVERFLOW; if (kbuf->f_ffree != 0xffffffffffffffffULL && (kbuf->f_ffree & 0xffffffff00000000ULL)) return -EOVERFLOW; } if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || __put_user(kbuf->f_type, &ubuf->f_type) || __put_user(kbuf->f_bsize, &ubuf->f_bsize) || __put_user(kbuf->f_blocks, &ubuf->f_blocks) || __put_user(kbuf->f_bfree, &ubuf->f_bfree) || __put_user(kbuf->f_bavail, &ubuf->f_bavail) || __put_user(kbuf->f_files, &ubuf->f_files) || __put_user(kbuf->f_ffree, &ubuf->f_ffree) || __put_user(kbuf->f_namelen, &ubuf->f_namelen) || __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || __put_user(kbuf->f_frsize, &ubuf->f_frsize) || __put_user(0, &ubuf->f_spare[0]) || __put_user(0, &ubuf->f_spare[1]) || __put_user(0, &ubuf->f_spare[2]) || __put_user(0, &ubuf->f_spare[3]) || __put_user(0, &ubuf->f_spare[4])) return -EFAULT; return 0; } /* * The following statfs calls are copies of code from fs/open.c and * should be checked against those from time to time */ asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf) { struct nameidata nd; int error; error = user_path_walk(path, &nd); if (!error) { struct kstatfs tmp; error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp); if (!error) error = put_compat_statfs(buf, &tmp); path_release(&nd); } return error; } asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf) { struct file * file; struct kstatfs tmp; int error; error = -EBADF; file = fget(fd); if (!file) goto out; error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp); if (!error) error = put_compat_statfs(buf, &tmp); fput(file); out: return error; } static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) { if (sizeof ubuf->f_blocks == 4) { if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) & 0xffffffff00000000ULL) return -EOVERFLOW; /* f_files and f_ffree may be -1; it's okay * to stuff that into 32 bits */ if (kbuf->f_files != 0xffffffffffffffffULL && (kbuf->f_files & 0xffffffff00000000ULL)) return -EOVERFLOW; if (kbuf->f_ffree != 0xffffffffffffffffULL && (kbuf->f_ffree & 0xffffffff00000000ULL)) return -EOVERFLOW; } if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || __put_user(kbuf->f_type, &ubuf->f_type) || __put_user(kbuf->f_bsize, &ubuf->f_bsize) || __put_user(kbuf->f_blocks, &ubuf->f_blocks) || __put_user(kbuf->f_bfree, &ubuf->f_bfree) || __put_user(kbuf->f_bavail, &ubuf->f_bavail) || __put_user(kbuf->f_files, &ubuf->f_files) || __put_user(kbuf->f_ffree, &ubuf->f_ffree) || __put_user(kbuf->f_namelen, &ubuf->f_namelen) || __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || __put_user(kbuf->f_frsize, &ubuf->f_frsize)) return -EFAULT; return 0; } asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf) { struct nameidata nd; int error; if (sz != sizeof(*buf)) return -EINVAL; error = user_path_walk(path, &nd); if (!error) { struct kstatfs tmp; error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp); if (!error) error = put_compat_statfs64(buf, &tmp); path_release(&nd); } return error; } asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf) { struct file * file; struct kstatfs tmp; int error; if (sz != sizeof(*buf)) return -EINVAL; error = -EBADF; file = fget(fd); if (!file) goto out; error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp); if (!error) error = put_compat_statfs64(buf, &tmp); fput(file); out: return error; } /* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */ #define IOCTL_HASHSIZE 256 static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE]; extern struct ioctl_trans ioctl_start[]; extern int ioctl_table_size; static inline unsigned long ioctl32_hash(unsigned long cmd) { return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE; } static void ioctl32_insert_translation(struct ioctl_trans *trans) { unsigned long hash; struct ioctl_trans *t; hash = ioctl32_hash (trans->cmd); if (!ioctl32_hash_table[hash]) ioctl32_hash_table[hash] = trans; else { t = ioctl32_hash_table[hash]; while (t->next) t = t->next; trans->next = NULL; t->next = trans; } } static int __init init_sys32_ioctl(void) { int i; for (i = 0; i < ioctl_table_size; i++) { if (ioctl_start[i].next != 0) { printk("ioctl translation %d bad\n",i); return -1; } ioctl32_insert_translation(&ioctl_start[i]); } return 0; } __initcall(init_sys32_ioctl); static void compat_ioctl_error(struct file *filp, unsigned int fd, unsigned int cmd, unsigned long arg) { char buf[10]; char *fn = "?"; char *path; /* find the name of the device. */ path = (char *)__get_free_page(GFP_KERNEL); if (path) { fn = d_path(filp->f_dentry, filp->f_vfsmnt, path, PAGE_SIZE); if (IS_ERR(fn)) fn = "?"; } sprintf(buf,"'%c'", (cmd>>24) & 0x3f); if (!isprint(buf[1])) sprintf(buf, "%02x", buf[1]); printk("ioctl32(%s:%d): Unknown cmd fd(%d) " "cmd(%08x){%s} arg(%08x) on %s\n", current->comm, current->pid, (int)fd, (unsigned int)cmd, buf, (unsigned int)arg, fn); if (path) free_page((unsigned long)path); } asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg) { struct file *filp; int error = -EBADF; struct ioctl_trans *t; int fput_needed; filp = fget_light(fd, &fput_needed); if (!filp) goto out; /* RED-PEN how should LSM module know it's handling 32bit? */ error = security_file_ioctl(filp, cmd, arg); if (error) goto out_fput; /* * To allow the compat_ioctl handlers to be self contained * we need to check the common ioctls here first. * Just handle them with the standard handlers below. */ switch (cmd) { case FIOCLEX: case FIONCLEX: case FIONBIO: case FIOASYNC: case FIOQSIZE: break; case FIBMAP: case FIGETBSZ: case FIONREAD: if (S_ISREG(filp->f_dentry->d_inode->i_mode)) break; /*FALL THROUGH*/ default: if (filp->f_op && filp->f_op->compat_ioctl) { error = filp->f_op->compat_ioctl(filp, cmd, arg); if (error != -ENOIOCTLCMD) goto out_fput; } if (!filp->f_op || (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl)) goto do_ioctl; break; } for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) { if (t->cmd == cmd) goto found_handler; } if (S_ISSOCK(filp->f_dentry->d_inode->i_mode) && cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { error = siocdevprivate_ioctl(fd, cmd, arg); } else { static int count; if (++count <= 50) compat_ioctl_error(filp, fd, cmd, arg); error = -EINVAL; } goto out_fput; found_handler: if (t->handler) { lock_kernel(); error = t->handler(fd, cmd, arg, filp); unlock_kernel(); goto out_fput; } do_ioctl: error = vfs_ioctl(filp, fd, cmd, arg); out_fput: fput_light(filp, fput_needed); out: return error; } static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) { if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || __get_user(kfl->l_type, &ufl->l_type) || __get_user(kfl->l_whence, &ufl->l_whence) || __get_user(kfl->l_start, &ufl->l_start) || __get_user(kfl->l_len, &ufl->l_len) || __get_user(kfl->l_pid, &ufl->l_pid)) return -EFAULT; return 0; } static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) { if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || __put_user(kfl->l_type, &ufl->l_type) || __put_user(kfl->l_whence, &ufl->l_whence) || __put_user(kfl->l_start, &ufl->l_start) || __put_user(kfl->l_len, &ufl->l_len) || __put_user(kfl->l_pid, &ufl->l_pid)) return -EFAULT; return 0; } #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) { if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || __get_user(kfl->l_type, &ufl->l_type) || __get_user(kfl->l_whence, &ufl->l_whence) || __get_user(kfl->l_start, &ufl->l_start) || __get_user(kfl->l_len, &ufl->l_len) || __get_user(kfl->l_pid, &ufl->l_pid)) return -EFAULT; return 0; } #endif #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) { if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || __put_user(kfl->l_type, &ufl->l_type) || __put_user(kfl->l_whence, &ufl->l_whence) || __put_user(kfl->l_start, &ufl->l_start) || __put_user(kfl->l_len, &ufl->l_len) || __put_user(kfl->l_pid, &ufl->l_pid)) return -EFAULT; return 0; } #endif asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) { mm_segment_t old_fs; struct flock f; long ret; switch (cmd) { case F_GETLK: case F_SETLK: case F_SETLKW: ret = get_compat_flock(&f, compat_ptr(arg)); if (ret != 0) break; old_fs = get_fs(); set_fs(KERNEL_DS); ret = sys_fcntl(fd, cmd, (unsigned long)&f); set_fs(old_fs); if (cmd == F_GETLK && ret == 0) { /* GETLK was successfule and we need to return the data... * but it needs to fit in the compat structure. * l_start shouldn't be too big, unless the original * start + end is greater than COMPAT_OFF_T_MAX, in which * case the app was asking for trouble, so we return * -EOVERFLOW in that case. * l_len could be too big, in which case we just truncate it, * and only allow the app to see that part of the conflicting * lock that might make sense to it anyway */ if (f.l_start > COMPAT_OFF_T_MAX) ret = -EOVERFLOW; if (f.l_len > COMPAT_OFF_T_MAX) f.l_len = COMPAT_OFF_T_MAX; if (ret == 0) ret = put_compat_flock(&f, compat_ptr(arg)); } break; case F_GETLK64: case F_SETLK64: case F_SETLKW64: ret = get_compat_flock64(&f, compat_ptr(arg)); if (ret != 0) break; old_fs = get_fs(); set_fs(KERNEL_DS); ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK : ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW), (unsigned long)&f); set_fs(old_fs); if (cmd == F_GETLK64 && ret == 0) { /* need to return lock information - see above for commentary */ if (f.l_start > COMPAT_LOFF_T_MAX) ret = -EOVERFLOW; if (f.l_len > COMPAT_LOFF_T_MAX) f.l_len = COMPAT_LOFF_T_MAX; if (ret == 0) ret = put_compat_flock64(&f, compat_ptr(arg)); } break; default: ret = sys_fcntl(fd, cmd, arg); break; } return ret; } asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg) { if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64)) return -EINVAL; return compat_sys_fcntl64(fd, cmd, arg); } asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p) { long ret; aio_context_t ctx64; mm_segment_t oldfs = get_fs(); if (unlikely(get_user(ctx64, ctx32p))) return -EFAULT; set_fs(KERNEL_DS); /* The __user pointer cast is valid because of the set_fs() */ ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64); set_fs(oldfs); /* truncating is ok because it's a user address */ if (!ret) ret = put_user((u32) ctx64, ctx32p); return ret; } asmlinkage long compat_sys_io_getevents(aio_context_t ctx_id, unsigned long min_nr, unsigned long nr, struct io_event __user *events, struct compat_timespec __user *timeout) { long ret; struct timespec t; struct timespec __user *ut = NULL; ret = -EFAULT; if (unlikely(!access_ok(VERIFY_WRITE, events, nr * sizeof(struct io_event)))) goto out; if (timeout) { if (get_compat_timespec(&t, timeout)) goto out; ut = compat_alloc_user_space(sizeof(*ut)); if (copy_to_user(ut, &t, sizeof(t)) ) goto out; } ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut); out: return ret; } static inline long copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64) { compat_uptr_t uptr; int i; for (i = 0; i < nr; ++i) { if (get_user(uptr, ptr32 + i)) return -EFAULT; if (put_user(compat_ptr(uptr), ptr64 + i)) return -EFAULT; } return 0; } #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *)) asmlinkage long compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb) { struct iocb __user * __user *iocb64; long ret; if (unlikely(nr < 0)) return -EINVAL; if (nr > MAX_AIO_SUBMITS) nr = MAX_AIO_SUBMITS; iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64)); ret = copy_iocb(nr, iocb, iocb64); if (!ret) ret = sys_io_submit(ctx_id, nr, iocb64); return ret; } struct compat_ncp_mount_data { compat_int_t version; compat_uint_t ncp_fd; __compat_uid_t mounted_uid; compat_pid_t wdog_pid; unsigned char mounted_vol[NCP_VOLNAME_LEN + 1]; compat_uint_t time_out; compat_uint_t retry_count; compat_uint_t flags; __compat_uid_t uid; __compat_gid_t gid; compat_mode_t file_mode; compat_mode_t dir_mode; }; struct compat_ncp_mount_data_v4 { compat_int_t version; compat_ulong_t flags; compat_ulong_t mounted_uid; compat_long_t wdog_pid; compat_uint_t ncp_fd; compat_uint_t time_out; compat_uint_t retry_count; compat_ulong_t uid; compat_ulong_t gid; compat_ulong_t file_mode; compat_ulong_t dir_mode; }; static void *do_ncp_super_data_conv(void *raw_data) { int version = *(unsigned int *)raw_data; if (version == 3) { struct compat_ncp_mount_data *c_n = raw_data; struct ncp_mount_data *n = raw_data; n->dir_mode = c_n->dir_mode; n->file_mode = c_n->file_mode; n->gid = c_n->gid; n->uid = c_n->uid; memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int))); n->wdog_pid = c_n->wdog_pid; n->mounted_uid = c_n->mounted_uid; } else if (version == 4) { struct compat_ncp_mount_data_v4 *c_n = raw_data; struct ncp_mount_data_v4 *n = raw_data; n->dir_mode = c_n->dir_mode; n->file_mode = c_n->file_mode; n->gid = c_n->gid; n->uid = c_n->uid; n->retry_count = c_n->retry_count; n->time_out = c_n->time_out; n->ncp_fd = c_n->ncp_fd; n->wdog_pid = c_n->wdog_pid; n->mounted_uid = c_n->mounted_uid; n->flags = c_n->flags; } else if (version != 5) { return NULL; } return raw_data; } struct compat_smb_mount_data { compat_int_t version; __compat_uid_t mounted_uid; __compat_uid_t uid; __compat_gid_t gid; compat_mode_t file_mode; compat_mode_t dir_mode; }; static void *do_smb_super_data_conv(void *raw_data) { struct smb_mount_data *s = raw_data; struct compat_smb_mount_data *c_s = raw_data; if (c_s->version != SMB_MOUNT_OLDVERSION) goto out; s->dir_mode = c_s->dir_mode; s->file_mode = c_s->file_mode; s->gid = c_s->gid; s->uid = c_s->uid; s->mounted_uid = c_s->mounted_uid; out: return raw_data; } struct compat_nfs_string { compat_uint_t len; compat_uptr_t data; }; static inline void compat_nfs_string(struct nfs_string *dst, struct compat_nfs_string *src) { dst->data = compat_ptr(src->data); dst->len = src->len; } struct compat_nfs4_mount_data_v1 { compat_int_t version; compat_int_t flags; compat_int_t rsize; compat_int_t wsize; compat_int_t timeo; compat_int_t retrans; compat_int_t acregmin; compat_int_t acregmax; compat_int_t acdirmin; compat_int_t acdirmax; struct compat_nfs_string client_addr; struct compat_nfs_string mnt_path; struct compat_nfs_string hostname; compat_uint_t host_addrlen; compat_uptr_t host_addr; compat_int_t proto; compat_int_t auth_flavourlen; compat_uptr_t auth_flavours; }; static int do_nfs4_super_data_conv(void *raw_data) { int version = *(compat_uint_t *) raw_data; if (version == 1) { struct compat_nfs4_mount_data_v1 *raw = raw_data; struct nfs4_mount_data *real = raw_data; /* copy the fields backwards */ real->auth_flavours = compat_ptr(raw->auth_flavours); real->auth_flavourlen = raw->auth_flavourlen; real->proto = raw->proto; real->host_addr = compat_ptr(raw->host_addr); real->host_addrlen = raw->host_addrlen; compat_nfs_string(&real->hostname, &raw->hostname); compat_nfs_string(&real->mnt_path, &raw->mnt_path); compat_nfs_string(&real->client_addr, &raw->client_addr); real->acdirmax = raw->acdirmax; real->acdirmin = raw->acdirmin; real->acregmax = raw->acregmax; real->acregmin = raw->acregmin; real->retrans = raw->retrans; real->timeo = raw->timeo; real->wsize = raw->wsize; real->rsize = raw->rsize; real->flags = raw->flags; real->version = raw->version; } else { return -EINVAL; } return 0; } extern int copy_mount_options (const void __user *, unsigned long *); #define SMBFS_NAME "smbfs" #define NCPFS_NAME "ncpfs" #define NFS4_NAME "nfs4" asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name, char __user * type, unsigned long flags, void __user * data) { unsigned long type_page; unsigned long data_page; unsigned long dev_page; char *dir_page; int retval; retval = copy_mount_options (type, &type_page); if (retval < 0) goto out; dir_page = getname(dir_name); retval = PTR_ERR(dir_page); if (IS_ERR(dir_page)) goto out1; retval = copy_mount_options (dev_name, &dev_page); if (retval < 0) goto out2; retval = copy_mount_options (data, &data_page); if (retval < 0) goto out3; retval = -EINVAL; if (type_page) { if (!strcmp((char *)type_page, SMBFS_NAME)) { do_smb_super_data_conv((void *)data_page); } else if (!strcmp((char *)type_page, NCPFS_NAME)) { do_ncp_super_data_conv((void *)data_page); } else if (!strcmp((char *)type_page, NFS4_NAME)) { if (do_nfs4_super_data_conv((void *) data_page)) goto out4; } } lock_kernel(); retval = do_mount((char*)dev_page, dir_page, (char*)type_page, flags, (void*)data_page); unlock_kernel(); out4: free_page(data_page); out3: free_page(dev_page); out2: putname(dir_page); out1: free_page(type_page); out: return retval; } #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de))) #define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \ ~(sizeof(compat_long_t)-1)) struct compat_old_linux_dirent { compat_ulong_t d_ino; compat_ulong_t d_offset; unsigned short d_namlen; char d_name[1]; }; struct compat_readdir_callback { struct compat_old_linux_dirent __user *dirent; int result; }; static int compat_fillonedir(void *__buf, const char *name, int namlen, loff_t offset, ino_t ino, unsigned int d_type) { struct compat_readdir_callback *buf = __buf; struct compat_old_linux_dirent __user *dirent; if (buf->result) return -EINVAL; buf->result++; dirent = buf->dirent; if (!access_ok(VERIFY_WRITE, dirent, (unsigned long)(dirent->d_name + namlen + 1) - (unsigned long)dirent)) goto efault; if ( __put_user(ino, &dirent->d_ino) || __put_user(offset, &dirent->d_offset) || __put_user(namlen, &dirent->d_namlen) || __copy_to_user(dirent->d_name, name, namlen) || __put_user(0, dirent->d_name + namlen)) goto efault; return 0; efault: buf->result = -EFAULT; return -EFAULT; } asmlinkage long compat_sys_old_readdir(unsigned int fd, struct compat_old_linux_dirent __user *dirent, unsigned int count) { int error; struct file *file; struct compat_readdir_callback buf; error = -EBADF; file = fget(fd); if (!file) goto out; buf.result = 0; buf.dirent = dirent; error = vfs_readdir(file, compat_fillonedir, &buf); if (error >= 0) error = buf.result; fput(file); out: return error; } struct compat_linux_dirent { compat_ulong_t d_ino; compat_ulong_t d_off; unsigned short d_reclen; char d_name[1]; }; struct compat_getdents_callback { struct compat_linux_dirent __user *current_dir; struct compat_linux_dirent __user *previous; int count; int error; }; static int compat_filldir(void *__buf, const char *name, int namlen, loff_t offset, ino_t ino, unsigned int d_type) { struct compat_linux_dirent __user * dirent; struct compat_getdents_callback *buf = __buf; int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2); buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) return -EINVAL; dirent = buf->previous; if (dirent) { if (__put_user(offset, &dirent->d_off)) goto efault; } dirent = buf->current_dir; if (__put_user(ino, &dirent->d_ino)) goto efault; if (__put_user(reclen, &dirent->d_reclen)) goto efault; if (copy_to_user(dirent->d_name, name, namlen)) goto efault; if (__put_user(0, dirent->d_name + namlen)) goto efault; if (__put_user(d_type, (char __user *) dirent + reclen - 1)) goto efault; buf->previous = dirent; dirent = (void __user *)dirent + reclen; buf->current_dir = dirent; buf->count -= reclen; return 0; efault: buf->error = -EFAULT; return -EFAULT; } asmlinkage long compat_sys_getdents(unsigned int fd, struct compat_linux_dirent __user *dirent, unsigned int count) { struct file * file; struct compat_linux_dirent __user * lastdirent; struct compat_getdents_callback buf; int error; error = -EFAULT; if (!access_ok(VERIFY_WRITE, dirent, count)) goto out; error = -EBADF; file = fget(fd); if (!file) goto out; buf.current_dir = dirent; buf.previous = NULL; buf.count = count; buf.error = 0; error = vfs_readdir(file, compat_filldir, &buf); if (error < 0) goto out_putf; error = buf.error; lastdirent = buf.previous; if (lastdirent) { if (put_user(file->f_pos, &lastdirent->d_off)) error = -EFAULT; else error = count - buf.count; } out_putf: fput(file); out: return error; } #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64 #define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1)) struct compat_getdents_callback64 { struct linux_dirent64 __user *current_dir; struct linux_dirent64 __user *previous; int count; int error; }; static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset, ino_t ino, unsigned int d_type) { struct linux_dirent64 __user *dirent; struct compat_getdents_callback64 *buf = __buf; int jj = NAME_OFFSET(dirent); int reclen = COMPAT_ROUND_UP64(jj + namlen + 1); u64 off; buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) return -EINVAL; dirent = buf->previous; if (dirent) { if (__put_user_unaligned(offset, &dirent->d_off)) goto efault; } dirent = buf->current_dir; if (__put_user_unaligned(ino, &dirent->d_ino)) goto efault; off = 0; if (__put_user_unaligned(off, &dirent->d_off)) goto efault; if (__put_user(reclen, &dirent->d_reclen)) goto efault; if (__put_user(d_type, &dirent->d_type)) goto efault; if (copy_to_user(dirent->d_name, name, namlen)) goto efault; if (__put_user(0, dirent->d_name + namlen)) goto efault; buf->previous = dirent; dirent = (void __user *)dirent + reclen; buf->current_dir = dirent; buf->count -= reclen; return 0; efault: buf->error = -EFAULT; return -EFAULT; } asmlinkage long compat_sys_getdents64(unsigned int fd, struct linux_dirent64 __user * dirent, unsigned int count) { struct file * file; struct linux_dirent64 __user * lastdirent; struct compat_getdents_callback64 buf; int error; error = -EFAULT; if (!access_ok(VERIFY_WRITE, dirent, count)) goto out; error = -EBADF; file = fget(fd); if (!file) goto out; buf.current_dir = dirent; buf.previous = NULL; buf.count = count; buf.error = 0; error = vfs_readdir(file, compat_filldir64, &buf); if (error < 0) goto out_putf; error = buf.error; lastdirent = buf.previous; if (lastdirent) { typeof(lastdirent->d_off) d_off = file->f_pos; __put_user_unaligned(d_off, &lastdirent->d_off); error = count - buf.count; } out_putf: fput(file); out: return error; } #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */ static ssize_t compat_do_readv_writev(int type, struct file *file, const struct compat_iovec __user *uvector, unsigned long nr_segs, loff_t *pos) { typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); typedef ssize_t (*iov_fn_t)(struct file *, const struct iovec *, unsigned long, loff_t *); compat_ssize_t tot_len; struct iovec iovstack[UIO_FASTIOV]; struct iovec *iov=iovstack, *vector; ssize_t ret; int seg; io_fn_t fn; iov_fn_t fnv; /* * SuS says "The readv() function *may* fail if the iovcnt argument * was less than or equal to 0, or greater than {IOV_MAX}. Linux has * traditionally returned zero for zero segments, so... */ ret = 0; if (nr_segs == 0) goto out; /* * First get the "struct iovec" from user memory and * verify all the pointers */ ret = -EINVAL; if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0)) goto out; if (!file->f_op) goto out; if (nr_segs > UIO_FASTIOV) { ret = -ENOMEM; iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); if (!iov) goto out; } ret = -EFAULT; if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) goto out; /* * Single unix specification: * We should -EINVAL if an element length is not >= 0 and fitting an * ssize_t. The total length is fitting an ssize_t * * Be careful here because iov_len is a size_t not an ssize_t */ tot_len = 0; vector = iov; ret = -EINVAL; for (seg = 0 ; seg < nr_segs; seg++) { compat_ssize_t tmp = tot_len; compat_ssize_t len; compat_uptr_t buf; if (__get_user(len, &uvector->iov_len) || __get_user(buf, &uvector->iov_base)) { ret = -EFAULT; goto out; } if (len < 0) /* size_t not fitting an compat_ssize_t .. */ goto out; tot_len += len; if (tot_len < tmp) /* maths overflow on the compat_ssize_t */ goto out; vector->iov_base = compat_ptr(buf); vector->iov_len = (compat_size_t) len; uvector++; vector++; } if (tot_len == 0) { ret = 0; goto out; } ret = rw_verify_area(type, file, pos, tot_len); if (ret < 0) goto out; fnv = NULL; if (type == READ) { fn = file->f_op->read; fnv = file->f_op->readv; } else { fn = (io_fn_t)file->f_op->write; fnv = file->f_op->writev; } if (fnv) { ret = fnv(file, iov, nr_segs, pos); goto out; } /* Do it by hand, with file-ops */ ret = 0; vector = iov; while (nr_segs > 0) { void __user * base; size_t len; ssize_t nr; base = vector->iov_base; len = vector->iov_len; vector++; nr_segs--; nr = fn(file, base, len, pos); if (nr < 0) { if (!ret) ret = nr; break; } ret += nr; if (nr != len) break; } out: if (iov != iovstack) kfree(iov); if ((ret + (type == READ)) > 0) { struct dentry *dentry = file->f_dentry; if (type == READ) fsnotify_access(dentry); else fsnotify_modify(dentry); } return ret; } asmlinkage ssize_t compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen) { struct file *file; ssize_t ret = -EBADF; file = fget(fd); if (!file) return -EBADF; if (!(file->f_mode & FMODE_READ)) goto out; ret = -EINVAL; if (!file->f_op || (!file->f_op->readv && !file->f_op->read)) goto out; ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos); out: fput(file); return ret; } asmlinkage ssize_t compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen) { struct file *file; ssize_t ret = -EBADF; file = fget(fd); if (!file) return -EBADF; if (!(file->f_mode & FMODE_WRITE)) goto out; ret = -EINVAL; if (!file->f_op || (!file->f_op->writev && !file->f_op->write)) goto out; ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos); out: fput(file); return ret; } /* * Exactly like fs/open.c:sys_open(), except that it doesn't set the * O_LARGEFILE flag. */ asmlinkage long compat_sys_open(const char __user *filename, int flags, int mode) { return do_sys_open(filename, flags, mode); } /* * compat_count() counts the number of arguments/envelopes. It is basically * a copy of count() from fs/exec.c, except that it works with 32 bit argv * and envp pointers. */ static int compat_count(compat_uptr_t __user *argv, int max) { int i = 0; if (argv != NULL) { for (;;) { compat_uptr_t p; if (get_user(p, argv)) return -EFAULT; if (!p) break; argv++; if(++i > max) return -E2BIG; } } return i; } /* * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c * except that it works with 32 bit argv and envp pointers. */ static int compat_copy_strings(int argc, compat_uptr_t __user *argv, struct linux_binprm *bprm) { struct page *kmapped_page = NULL; char *kaddr = NULL; int ret; while (argc-- > 0) { compat_uptr_t str; int len; unsigned long pos; if (get_user(str, argv+argc) || !(len = strnlen_user(compat_ptr(str), bprm->p))) { ret = -EFAULT; goto out; } if (bprm->p < len) { ret = -E2BIG; goto out; } bprm->p -= len; /* XXX: add architecture specific overflow check here. */ pos = bprm->p; while (len > 0) { int i, new, err; int offset, bytes_to_copy; struct page *page; offset = pos % PAGE_SIZE; i = pos/PAGE_SIZE; page = bprm->page[i]; new = 0; if (!page) { page = alloc_page(GFP_HIGHUSER); bprm->page[i] = page; if (!page) { ret = -ENOMEM; goto out; } new = 1; } if (page != kmapped_page) { if (kmapped_page) kunmap(kmapped_page); kmapped_page = page; kaddr = kmap(kmapped_page); } if (new && offset) memset(kaddr, 0, offset); bytes_to_copy = PAGE_SIZE - offset; if (bytes_to_copy > len) { bytes_to_copy = len; if (new) memset(kaddr+offset+len, 0, PAGE_SIZE-offset-len); } err = copy_from_user(kaddr+offset, compat_ptr(str), bytes_to_copy); if (err) { ret = -EFAULT; goto out; } pos += bytes_to_copy; str += bytes_to_copy; len -= bytes_to_copy; } } ret = 0; out: if (kmapped_page) kunmap(kmapped_page); return ret; } #ifdef CONFIG_MMU #define free_arg_pages(bprm) do { } while (0) #else static inline void free_arg_pages(struct linux_binprm *bprm) { int i; for (i = 0; i < MAX_ARG_PAGES; i++) { if (bprm->page[i]) __free_page(bprm->page[i]); bprm->page[i] = NULL; } } #endif /* CONFIG_MMU */ /* * compat_do_execve() is mostly a copy of do_execve(), with the exception * that it processes 32 bit argv and envp pointers. */ int compat_do_execve(char * filename, compat_uptr_t __user *argv, compat_uptr_t __user *envp, struct pt_regs * regs) { struct linux_binprm *bprm; struct file *file; int retval; int i; retval = -ENOMEM; bprm = kmalloc(sizeof(*bprm), GFP_KERNEL); if (!bprm) goto out_ret; memset(bprm, 0, sizeof(*bprm)); file = open_exec(filename); retval = PTR_ERR(file); if (IS_ERR(file)) goto out_kfree; sched_exec(); bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *); bprm->file = file; bprm->filename = filename; bprm->interp = filename; bprm->mm = mm_alloc(); retval = -ENOMEM; if (!bprm->mm) goto out_file; retval = init_new_context(current, bprm->mm); if (retval < 0) goto out_mm; bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t)); if ((retval = bprm->argc) < 0) goto out_mm; bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t)); if ((retval = bprm->envc) < 0) goto out_mm; retval = security_bprm_alloc(bprm); if (retval) goto out; retval = prepare_binprm(bprm); if (retval < 0) goto out; retval = copy_strings_kernel(1, &bprm->filename, bprm); if (retval < 0) goto out; bprm->exec = bprm->p; retval = compat_copy_strings(bprm->envc, envp, bprm); if (retval < 0) goto out; retval = compat_copy_strings(bprm->argc, argv, bprm); if (retval < 0) goto out; retval = search_binary_handler(bprm, regs); if (retval >= 0) { free_arg_pages(bprm); /* execve success */ security_bprm_free(bprm); acct_update_integrals(current); kfree(bprm); return retval; } out: /* Something went wrong, return the inode and free the argument pages*/ for (i = 0 ; i < MAX_ARG_PAGES ; i++) { struct page * page = bprm->page[i]; if (page) __free_page(page); } if (bprm->security) security_bprm_free(bprm); out_mm: if (bprm->mm) mmdrop(bprm->mm); out_file: if (bprm->file) { allow_write_access(bprm->file); fput(bprm->file); } out_kfree: kfree(bprm); out_ret: return retval; } #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) /* * Ooo, nasty. We need here to frob 32-bit unsigned longs to * 64-bit unsigned longs. */ static inline int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { nr = ROUND_UP(nr, __COMPAT_NFDBITS); if (ufdset) { unsigned long odd; if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) return -EFAULT; odd = nr & 1UL; nr &= ~1UL; while (nr) { unsigned long h, l; __get_user(l, ufdset); __get_user(h, ufdset+1); ufdset += 2; *fdset++ = h << 32 | l; nr -= 2; } if (odd) __get_user(*fdset, ufdset); } else { /* Tricky, must clear full unsigned long in the * kernel fdset at the end, this makes sure that * actually happens. */ memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); } return 0; } static inline void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { unsigned long odd; nr = ROUND_UP(nr, __COMPAT_NFDBITS); if (!ufdset) return; odd = nr & 1UL; nr &= ~1UL; while (nr) { unsigned long h, l; l = *fdset++; h = l >> 32; __put_user(l, ufdset); __put_user(h, ufdset+1); ufdset += 2; nr -= 2; } if (odd) __put_user(*fdset, ufdset); } /* * This is a virtual copy of sys_select from fs/select.c and probably * should be compared to it from time to time */ static void *select_bits_alloc(int size) { return kmalloc(6 * size, GFP_KERNEL); } static void select_bits_free(void *bits, int size) { kfree(bits); } /* * We can actually return ERESTARTSYS instead of EINTR, but I'd * like to be certain this leads to no problems. So I return * EINTR just for safety. * * Update: ERESTARTSYS breaks at least the xview clock binary, so * I'm trying ERESTARTNOHAND which restart only when you want to. */ #define MAX_SELECT_SECONDS \ ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1) asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp, compat_ulong_t __user *exp, struct compat_timeval __user *tvp) { fd_set_bits fds; char *bits; long timeout; int size, max_fdset, ret = -EINVAL; struct fdtable *fdt; timeout = MAX_SCHEDULE_TIMEOUT; if (tvp) { time_t sec, usec; if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp)) || __get_user(sec, &tvp->tv_sec) || __get_user(usec, &tvp->tv_usec)) { ret = -EFAULT; goto out_nofds; } if (sec < 0 || usec < 0) goto out_nofds; if ((unsigned long) sec < MAX_SELECT_SECONDS) { timeout = ROUND_UP(usec, 1000000/HZ); timeout += sec * (unsigned long) HZ; } } if (n < 0) goto out_nofds; /* max_fdset can increase, so grab it once to avoid race */ rcu_read_lock(); fdt = files_fdtable(current->files); max_fdset = fdt->max_fdset; rcu_read_unlock(); if (n > max_fdset) n = max_fdset; /* * We need 6 bitmaps (in/out/ex for both incoming and outgoing), * since we used fdset we need to allocate memory in units of * long-words. */ ret = -ENOMEM; size = FDS_BYTES(n); bits = select_bits_alloc(size); if (!bits) goto out_nofds; fds.in = (unsigned long *) bits; fds.out = (unsigned long *) (bits + size); fds.ex = (unsigned long *) (bits + 2*size); fds.res_in = (unsigned long *) (bits + 3*size); fds.res_out = (unsigned long *) (bits + 4*size); fds.res_ex = (unsigned long *) (bits + 5*size); if ((ret = compat_get_fd_set(n, inp, fds.in)) || (ret = compat_get_fd_set(n, outp, fds.out)) || (ret = compat_get_fd_set(n, exp, fds.ex))) goto out; zero_fd_set(n, fds.res_in); zero_fd_set(n, fds.res_out); zero_fd_set(n, fds.res_ex); ret = do_select(n, &fds, &timeout); if (tvp && !(current->personality & STICKY_TIMEOUTS)) { time_t sec = 0, usec = 0; if (timeout) { sec = timeout / HZ; usec = timeout % HZ; usec *= (1000000/HZ); } if (put_user(sec, &tvp->tv_sec) || put_user(usec, &tvp->tv_usec)) ret = -EFAULT; } if (ret < 0) goto out; if (!ret) { ret = -ERESTARTNOHAND; if (signal_pending(current)) goto out; ret = 0; } compat_set_fd_set(n, inp, fds.res_in); compat_set_fd_set(n, outp, fds.res_out); compat_set_fd_set(n, exp, fds.res_ex); out: select_bits_free(bits, size); out_nofds: return ret; } #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE) /* Stuff for NFS server syscalls... */ struct compat_nfsctl_svc { u16 svc32_port; s32 svc32_nthreads; }; struct compat_nfsctl_client { s8 cl32_ident[NFSCLNT_IDMAX+1]; s32 cl32_naddr; struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX]; s32 cl32_fhkeytype; s32 cl32_fhkeylen; u8 cl32_fhkey[NFSCLNT_KEYMAX]; }; struct compat_nfsctl_export { char ex32_client[NFSCLNT_IDMAX+1]; char ex32_path[NFS_MAXPATHLEN+1]; compat_dev_t ex32_dev; compat_ino_t ex32_ino; compat_int_t ex32_flags; __compat_uid_t ex32_anon_uid; __compat_gid_t ex32_anon_gid; }; struct compat_nfsctl_fdparm { struct sockaddr gd32_addr; s8 gd32_path[NFS_MAXPATHLEN+1]; compat_int_t gd32_version; }; struct compat_nfsctl_fsparm { struct sockaddr gd32_addr; s8 gd32_path[NFS_MAXPATHLEN+1]; compat_int_t gd32_maxlen; }; struct compat_nfsctl_arg { compat_int_t ca32_version; /* safeguard */ union { struct compat_nfsctl_svc u32_svc; struct compat_nfsctl_client u32_client; struct compat_nfsctl_export u32_export; struct compat_nfsctl_fdparm u32_getfd; struct compat_nfsctl_fsparm u32_getfs; } u; #define ca32_svc u.u32_svc #define ca32_client u.u32_client #define ca32_export u.u32_export #define ca32_getfd u.u32_getfd #define ca32_getfs u.u32_getfs }; union compat_nfsctl_res { __u8 cr32_getfh[NFS_FHSIZE]; struct knfsd_fh cr32_getfs; }; static int compat_nfs_svc_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { int err; err = access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)); err |= get_user(karg->ca_version, &arg->ca32_version); err |= __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port); err |= __get_user(karg->ca_svc.svc_nthreads, &arg->ca32_svc.svc32_nthreads); return (err) ? -EFAULT : 0; } static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { int err; err = access_ok(VERIFY_READ, &arg->ca32_client, sizeof(arg->ca32_client)); err |= get_user(karg->ca_version, &arg->ca32_version); err |= __copy_from_user(&karg->ca_client.cl_ident[0], &arg->ca32_client.cl32_ident[0], NFSCLNT_IDMAX); err |= __get_user(karg->ca_client.cl_naddr, &arg->ca32_client.cl32_naddr); err |= __copy_from_user(&karg->ca_client.cl_addrlist[0], &arg->ca32_client.cl32_addrlist[0], (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)); err |= __get_user(karg->ca_client.cl_fhkeytype, &arg->ca32_client.cl32_fhkeytype); err |= __get_user(karg->ca_client.cl_fhkeylen, &arg->ca32_client.cl32_fhkeylen); err |= __copy_from_user(&karg->ca_client.cl_fhkey[0], &arg->ca32_client.cl32_fhkey[0], NFSCLNT_KEYMAX); return (err) ? -EFAULT : 0; } static int compat_nfs_exp_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { int err; err = access_ok(VERIFY_READ, &arg->ca32_export, sizeof(arg->ca32_export)); err |= get_user(karg->ca_version, &arg->ca32_version); err |= __copy_from_user(&karg->ca_export.ex_client[0], &arg->ca32_export.ex32_client[0], NFSCLNT_IDMAX); err |= __copy_from_user(&karg->ca_export.ex_path[0], &arg->ca32_export.ex32_path[0], NFS_MAXPATHLEN); err |= __get_user(karg->ca_export.ex_dev, &arg->ca32_export.ex32_dev); err |= __get_user(karg->ca_export.ex_ino, &arg->ca32_export.ex32_ino); err |= __get_user(karg->ca_export.ex_flags, &arg->ca32_export.ex32_flags); err |= __get_user(karg->ca_export.ex_anon_uid, &arg->ca32_export.ex32_anon_uid); err |= __get_user(karg->ca_export.ex_anon_gid, &arg->ca32_export.ex32_anon_gid); SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid); SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid); return (err) ? -EFAULT : 0; } static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { int err; err = access_ok(VERIFY_READ, &arg->ca32_getfd, sizeof(arg->ca32_getfd)); err |= get_user(karg->ca_version, &arg->ca32_version); err |= __copy_from_user(&karg->ca_getfd.gd_addr, &arg->ca32_getfd.gd32_addr, (sizeof(struct sockaddr))); err |= __copy_from_user(&karg->ca_getfd.gd_path, &arg->ca32_getfd.gd32_path, (NFS_MAXPATHLEN+1)); err |= __get_user(karg->ca_getfd.gd_version, &arg->ca32_getfd.gd32_version); return (err) ? -EFAULT : 0; } static int compat_nfs_getfs_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { int err; err = access_ok(VERIFY_READ, &arg->ca32_getfs, sizeof(arg->ca32_getfs)); err |= get_user(karg->ca_version, &arg->ca32_version); err |= __copy_from_user(&karg->ca_getfs.gd_addr, &arg->ca32_getfs.gd32_addr, (sizeof(struct sockaddr))); err |= __copy_from_user(&karg->ca_getfs.gd_path, &arg->ca32_getfs.gd32_path, (NFS_MAXPATHLEN+1)); err |= __get_user(karg->ca_getfs.gd_maxlen, &arg->ca32_getfs.gd32_maxlen); return (err) ? -EFAULT : 0; } /* This really doesn't need translations, we are only passing * back a union which contains opaque nfs file handle data. */ static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, union compat_nfsctl_res __user *res) { int err; err = copy_to_user(res, kres, sizeof(*res)); return (err) ? -EFAULT : 0; } asmlinkage long compat_sys_nfsservctl(int cmd, struct compat_nfsctl_arg __user *arg, union compat_nfsctl_res __user *res) { struct nfsctl_arg *karg; union nfsctl_res *kres; mm_segment_t oldfs; int err; karg = kmalloc(sizeof(*karg), GFP_USER); kres = kmalloc(sizeof(*kres), GFP_USER); if(!karg || !kres) { err = -ENOMEM; goto done; } switch(cmd) { case NFSCTL_SVC: err = compat_nfs_svc_trans(karg, arg); break; case NFSCTL_ADDCLIENT: err = compat_nfs_clnt_trans(karg, arg); break; case NFSCTL_DELCLIENT: err = compat_nfs_clnt_trans(karg, arg); break; case NFSCTL_EXPORT: case NFSCTL_UNEXPORT: err = compat_nfs_exp_trans(karg, arg); break; case NFSCTL_GETFD: err = compat_nfs_getfd_trans(karg, arg); break; case NFSCTL_GETFS: err = compat_nfs_getfs_trans(karg, arg); break; default: err = -EINVAL; goto done; } oldfs = get_fs(); set_fs(KERNEL_DS); /* The __user pointer casts are valid because of the set_fs() */ err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres); set_fs(oldfs); if (err) goto done; if((cmd == NFSCTL_GETFD) || (cmd == NFSCTL_GETFS)) err = compat_nfs_getfh_res_trans(kres, res); done: kfree(karg); kfree(kres); return err; } #else /* !NFSD */ long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2) { return sys_ni_syscall(); } #endif