/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "internal.h" int compat_log = 1; int compat_printk(const char *fmt, ...) { va_list ap; int ret; if (!compat_log) return 0; va_start(ap, fmt); ret = vprintk(fmt, ap); va_end(ap); return ret; } #include "read_write.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 timespec 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_nsec = 0; tv[1].tv_nsec = 0; } return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); } asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename, struct compat_timespec __user *t, int flags) { struct timespec tv[2]; if (t) { if (get_compat_timespec(&tv[0], &t[0]) || get_compat_timespec(&tv[1], &t[1])) return -EFAULT; if ((tv[0].tv_nsec == UTIME_OMIT || tv[0].tv_nsec == UTIME_NOW) && tv[0].tv_sec != 0) return -EINVAL; if ((tv[1].tv_nsec == UTIME_OMIT || tv[1].tv_nsec == UTIME_NOW) && tv[1].tv_sec != 0) return -EINVAL; if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) return 0; } return do_utimes(dfd, filename, t ? tv : NULL, flags); } asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t) { struct timespec tv[2]; if (t) { if (get_user(tv[0].tv_sec, &t[0].tv_sec) || get_user(tv[0].tv_nsec, &t[0].tv_usec) || get_user(tv[1].tv_sec, &t[1].tv_sec) || get_user(tv[1].tv_nsec, &t[1].tv_usec)) return -EFAULT; if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) return -EINVAL; tv[0].tv_nsec *= 1000; tv[1].tv_nsec *= 1000; } return do_utimes(dfd, filename, t ? tv : NULL, 0); } asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t) { return compat_sys_futimesat(AT_FDCWD, filename, t); } asmlinkage long compat_sys_newstat(char __user * filename, struct compat_stat __user *statbuf) { struct kstat stat; int error = vfs_stat_fd(AT_FDCWD, 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_fd(AT_FDCWD, filename, &stat); if (!error) error = cp_compat_stat(&stat, statbuf); return error; } #ifndef __ARCH_WANT_STAT64 asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename, struct compat_stat __user *statbuf, int flag) { struct kstat stat; int error = -EINVAL; if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) goto out; if (flag & AT_SYMLINK_NOFOLLOW) error = vfs_lstat_fd(dfd, filename, &stat); else error = vfs_stat_fd(dfd, filename, &stat); if (!error) error = cp_compat_stat(&stat, statbuf); out: return error; } #endif 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.path.dentry, &tmp); if (!error) error = put_compat_statfs(buf, &tmp); path_put(&nd.path); } 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_path.dentry, &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.path.dentry, &tmp); if (!error) error = put_compat_statfs64(buf, &tmp); path_put(&nd.path); } 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_path.dentry, &tmp); if (!error) error = put_compat_statfs64(buf, &tmp); fput(file); 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; } return 0; } #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 && data_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))) 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, u64 ino, unsigned int d_type) { struct compat_readdir_callback *buf = __buf; struct compat_old_linux_dirent __user *dirent; compat_ulong_t d_ino; if (buf->result) return -EINVAL; d_ino = ino; if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) return -EOVERFLOW; 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(d_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, u64 ino, unsigned int d_type) { struct compat_linux_dirent __user * dirent; struct compat_getdents_callback *buf = __buf; compat_ulong_t d_ino; int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t)); buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) return -EINVAL; d_ino = ino; if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) return -EOVERFLOW; dirent = buf->previous; if (dirent) { if (__put_user(offset, &dirent->d_off)) goto efault; } dirent = buf->current_dir; if (__put_user(d_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 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, u64 ino, unsigned int d_type) { struct linux_dirent64 __user *dirent; struct compat_getdents_callback64 *buf = __buf; int jj = NAME_OFFSET(dirent); int reclen = ALIGN(jj + namlen + 1, sizeof(u64)); 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; error = -EFAULT; if (__put_user_unaligned(d_off, &lastdirent->d_off)) goto out_putf; 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) { 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->aio_read; } else { fn = (io_fn_t)file->f_op->write; fnv = file->f_op->aio_write; } if (fnv) ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, pos, fnv); else ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); out: if (iov != iovstack) kfree(iov); if ((ret + (type == READ)) > 0) { struct dentry *dentry = file->f_path.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->aio_read && !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->aio_write && !file->f_op->write)) goto out; ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos); out: fput(file); return ret; } asmlinkage long compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32, unsigned int nr_segs, unsigned int flags) { unsigned i; struct iovec __user *iov; if (nr_segs > UIO_MAXIOV) return -EINVAL; iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec)); for (i = 0; i < nr_segs; i++) { struct compat_iovec v; if (get_user(v.iov_base, &iov32[i].iov_base) || get_user(v.iov_len, &iov32[i].iov_len) || put_user(compat_ptr(v.iov_base), &iov[i].iov_base) || put_user(v.iov_len, &iov[i].iov_len)) return -EFAULT; } return sys_vmsplice(fd, iov, nr_segs, flags); } /* * 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(AT_FDCWD, filename, flags, mode); } /* * Exactly like fs/open.c:sys_openat(), except that it doesn't set the * O_LARGEFILE flag. */ asmlinkage long compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode) { return do_sys_open(dfd, 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; unsigned long kpos = 0; 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), MAX_ARG_STRLEN))) { ret = -EFAULT; goto out; } if (len > MAX_ARG_STRLEN) { ret = -E2BIG; goto out; } /* We're going to work our way backwords. */ pos = bprm->p; str += len; bprm->p -= len; while (len > 0) { int offset, bytes_to_copy; offset = pos % PAGE_SIZE; if (offset == 0) offset = PAGE_SIZE; bytes_to_copy = offset; if (bytes_to_copy > len) bytes_to_copy = len; offset -= bytes_to_copy; pos -= bytes_to_copy; str -= bytes_to_copy; len -= bytes_to_copy; if (!kmapped_page || kpos != (pos & PAGE_MASK)) { struct page *page; #ifdef CONFIG_STACK_GROWSUP ret = expand_stack_downwards(bprm->vma, pos); if (ret < 0) { /* We've exceed the stack rlimit. */ ret = -E2BIG; goto out; } #endif ret = get_user_pages(current, bprm->mm, pos, 1, 1, 1, &page, NULL); if (ret <= 0) { /* We've exceed the stack rlimit. */ ret = -E2BIG; goto out; } if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); kunmap(kmapped_page); put_page(kmapped_page); } kmapped_page = page; kaddr = kmap(kmapped_page); kpos = pos & PAGE_MASK; flush_cache_page(bprm->vma, kpos, page_to_pfn(kmapped_page)); } if (copy_from_user(kaddr+offset, compat_ptr(str), bytes_to_copy)) { ret = -EFAULT; goto out; } } } ret = 0; out: if (kmapped_page) { flush_kernel_dcache_page(kmapped_page); kunmap(kmapped_page); put_page(kmapped_page); } return ret; } /* * 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; retval = -ENOMEM; bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); if (!bprm) goto out_ret; file = open_exec(filename); retval = PTR_ERR(file); if (IS_ERR(file)) goto out_kfree; sched_exec(); bprm->file = file; bprm->filename = filename; bprm->interp = filename; retval = bprm_mm_init(bprm); if (retval) goto out_file; bprm->argc = compat_count(argv, MAX_ARG_STRINGS); if ((retval = bprm->argc) < 0) goto out_mm; bprm->envc = compat_count(envp, MAX_ARG_STRINGS); 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) { /* execve success */ security_bprm_free(bprm); acct_update_integrals(current); free_bprm(bprm); return retval; } out: if (bprm->security) security_bprm_free(bprm); out_mm: if (bprm->mm) mmput(bprm->mm); out_file: if (bprm->file) { allow_write_access(bprm->file); fput(bprm->file); } out_kfree: free_bprm(bprm); out_ret: return retval; } #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) /* * Ooo, nasty. We need here to frob 32-bit unsigned longs to * 64-bit unsigned longs. */ static int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { nr = DIV_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; if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) return -EFAULT; ufdset += 2; *fdset++ = h << 32 | l; nr -= 2; } if (odd && __get_user(*fdset, ufdset)) return -EFAULT; } 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 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { unsigned long odd; nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); if (!ufdset) return 0; odd = nr & 1UL; nr &= ~1UL; while (nr) { unsigned long h, l; l = *fdset++; h = l >> 32; if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) return -EFAULT; ufdset += 2; nr -= 2; } if (odd && __put_user(*fdset, ufdset)) return -EFAULT; return 0; } /* * This is a virtual copy of sys_select from fs/select.c and probably * should be compared to it from time to time */ /* * 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) int compat_core_sys_select(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout) { fd_set_bits fds; void *bits; int size, max_fds, ret = -EINVAL; struct fdtable *fdt; long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; if (n < 0) goto out_nofds; /* max_fds can increase, so grab it once to avoid race */ rcu_read_lock(); fdt = files_fdtable(current->files); max_fds = fdt->max_fds; rcu_read_unlock(); if (n > max_fds) n = max_fds; /* * 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. */ size = FDS_BYTES(n); bits = stack_fds; if (size > sizeof(stack_fds) / 6) { bits = kmalloc(6 * size, GFP_KERNEL); ret = -ENOMEM; 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 (ret < 0) goto out; if (!ret) { ret = -ERESTARTNOHAND; if (signal_pending(current)) goto out; ret = 0; } if (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)) ret = -EFAULT; out: if (bits != stack_fds) kfree(bits); out_nofds: return ret; } 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) { s64 timeout = -1; struct compat_timeval tv; int ret; if (tvp) { if (copy_from_user(&tv, tvp, sizeof(tv))) return -EFAULT; if (tv.tv_sec < 0 || tv.tv_usec < 0) return -EINVAL; /* Cast to u64 to make GCC stop complaining */ if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS) timeout = -1; /* infinite */ else { timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ); timeout += tv.tv_sec * HZ; } } ret = compat_core_sys_select(n, inp, outp, exp, &timeout); if (tvp) { struct compat_timeval rtv; if (current->personality & STICKY_TIMEOUTS) goto sticky; rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)); rtv.tv_sec = timeout; if (compat_timeval_compare(&rtv, &tv) >= 0) rtv = tv; if (copy_to_user(tvp, &rtv, sizeof(rtv))) { sticky: /* * If an application puts its timeval in read-only * memory, we don't want the Linux-specific update to * the timeval to cause a fault after the select has * completed successfully. However, because we're not * updating the timeval, we can't restart the system * call. */ if (ret == -ERESTARTNOHAND) ret = -EINTR; } } return ret; } #ifdef HAVE_SET_RESTORE_SIGMASK asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp, compat_ulong_t __user *exp, struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, compat_size_t sigsetsize) { compat_sigset_t ss32; sigset_t ksigmask, sigsaved; s64 timeout = MAX_SCHEDULE_TIMEOUT; struct compat_timespec ts; int ret; if (tsp) { if (copy_from_user(&ts, tsp, sizeof(ts))) return -EFAULT; if (ts.tv_sec < 0 || ts.tv_nsec < 0) return -EINVAL; } if (sigmask) { if (sigsetsize != sizeof(compat_sigset_t)) return -EINVAL; if (copy_from_user(&ss32, sigmask, sizeof(ss32))) return -EFAULT; sigset_from_compat(&ksigmask, &ss32); sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); } do { if (tsp) { if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) { timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ); timeout += ts.tv_sec * (unsigned long)HZ; ts.tv_sec = 0; ts.tv_nsec = 0; } else { ts.tv_sec -= MAX_SELECT_SECONDS; timeout = MAX_SELECT_SECONDS * HZ; } } ret = compat_core_sys_select(n, inp, outp, exp, &timeout); } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec)); if (tsp) { struct compat_timespec rts; if (current->personality & STICKY_TIMEOUTS) goto sticky; rts.tv_sec = timeout / HZ; rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ); if (rts.tv_nsec >= NSEC_PER_SEC) { rts.tv_sec++; rts.tv_nsec -= NSEC_PER_SEC; } if (compat_timespec_compare(&rts, &ts) >= 0) rts = ts; if (copy_to_user(tsp, &rts, sizeof(rts))) { sticky: /* * If an application puts its timeval in read-only * memory, we don't want the Linux-specific update to * the timeval to cause a fault after the select has * completed successfully. However, because we're not * updating the timeval, we can't restart the system * call. */ if (ret == -ERESTARTNOHAND) ret = -EINTR; } } if (ret == -ERESTARTNOHAND) { /* * Don't restore the signal mask yet. Let do_signal() deliver * the signal on the way back to userspace, before the signal * mask is restored. */ if (sigmask) { memcpy(¤t->saved_sigmask, &sigsaved, sizeof(sigsaved)); set_restore_sigmask(); } } else if (sigmask) sigprocmask(SIG_SETMASK, &sigsaved, NULL); return ret; } asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp, compat_ulong_t __user *exp, struct compat_timespec __user *tsp, void __user *sig) { compat_size_t sigsetsize = 0; compat_uptr_t up = 0; if (sig) { if (!access_ok(VERIFY_READ, sig, sizeof(compat_uptr_t)+sizeof(compat_size_t)) || __get_user(up, (compat_uptr_t __user *)sig) || __get_user(sigsetsize, (compat_size_t __user *)(sig+sizeof(up)))) return -EFAULT; } return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up), sigsetsize); } asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds, unsigned int nfds, struct compat_timespec __user *tsp, const compat_sigset_t __user *sigmask, compat_size_t sigsetsize) { compat_sigset_t ss32; sigset_t ksigmask, sigsaved; struct compat_timespec ts; s64 timeout = -1; int ret; if (tsp) { if (copy_from_user(&ts, tsp, sizeof(ts))) return -EFAULT; /* We assume that ts.tv_sec is always lower than the number of seconds that can be expressed in an s64. Otherwise the compiler bitches at us */ timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ); timeout += ts.tv_sec * HZ; } if (sigmask) { if (sigsetsize != sizeof(compat_sigset_t)) return -EINVAL; if (copy_from_user(&ss32, sigmask, sizeof(ss32))) return -EFAULT; sigset_from_compat(&ksigmask, &ss32); sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); } ret = do_sys_poll(ufds, nfds, &timeout); /* We can restart this syscall, usually */ if (ret == -EINTR) { /* * Don't restore the signal mask yet. Let do_signal() deliver * the signal on the way back to userspace, before the signal * mask is restored. */ if (sigmask) { memcpy(¤t->saved_sigmask, &sigsaved, sizeof(sigsaved)); set_restore_sigmask(); } ret = -ERESTARTNOHAND; } else if (sigmask) sigprocmask(SIG_SETMASK, &sigsaved, NULL); if (tsp && timeout >= 0) { struct compat_timespec rts; if (current->personality & STICKY_TIMEOUTS) goto sticky; /* Yes, we know it's actually an s64, but it's also positive. */ rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) * 1000; rts.tv_sec = timeout; if (compat_timespec_compare(&rts, &ts) >= 0) rts = ts; if (copy_to_user(tsp, &rts, sizeof(rts))) { sticky: /* * If an application puts its timeval in read-only * memory, we don't want the Linux-specific update to * the timeval to cause a fault after the select has * completed successfully. However, because we're not * updating the timeval, we can't restart the system * call. */ if (ret == -ERESTARTNOHAND && timeout >= 0) ret = -EINTR; } } return ret; } #endif /* HAVE_SET_RESTORE_SIGMASK */ #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) { if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) || get_user(karg->ca_version, &arg->ca32_version) || __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) || __get_user(karg->ca_svc.svc_nthreads, &arg->ca32_svc.svc32_nthreads)) return -EFAULT; return 0; } static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { if (!access_ok(VERIFY_READ, &arg->ca32_client, sizeof(arg->ca32_client)) || get_user(karg->ca_version, &arg->ca32_version) || __copy_from_user(&karg->ca_client.cl_ident[0], &arg->ca32_client.cl32_ident[0], NFSCLNT_IDMAX) || __get_user(karg->ca_client.cl_naddr, &arg->ca32_client.cl32_naddr) || __copy_from_user(&karg->ca_client.cl_addrlist[0], &arg->ca32_client.cl32_addrlist[0], (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) || __get_user(karg->ca_client.cl_fhkeytype, &arg->ca32_client.cl32_fhkeytype) || __get_user(karg->ca_client.cl_fhkeylen, &arg->ca32_client.cl32_fhkeylen) || __copy_from_user(&karg->ca_client.cl_fhkey[0], &arg->ca32_client.cl32_fhkey[0], NFSCLNT_KEYMAX)) return -EFAULT; return 0; } static int compat_nfs_exp_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { if (!access_ok(VERIFY_READ, &arg->ca32_export, sizeof(arg->ca32_export)) || get_user(karg->ca_version, &arg->ca32_version) || __copy_from_user(&karg->ca_export.ex_client[0], &arg->ca32_export.ex32_client[0], NFSCLNT_IDMAX) || __copy_from_user(&karg->ca_export.ex_path[0], &arg->ca32_export.ex32_path[0], NFS_MAXPATHLEN) || __get_user(karg->ca_export.ex_dev, &arg->ca32_export.ex32_dev) || __get_user(karg->ca_export.ex_ino, &arg->ca32_export.ex32_ino) || __get_user(karg->ca_export.ex_flags, &arg->ca32_export.ex32_flags) || __get_user(karg->ca_export.ex_anon_uid, &arg->ca32_export.ex32_anon_uid) || __get_user(karg->ca_export.ex_anon_gid, &arg->ca32_export.ex32_anon_gid)) return -EFAULT; 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 0; } static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { if (!access_ok(VERIFY_READ, &arg->ca32_getfd, sizeof(arg->ca32_getfd)) || get_user(karg->ca_version, &arg->ca32_version) || __copy_from_user(&karg->ca_getfd.gd_addr, &arg->ca32_getfd.gd32_addr, (sizeof(struct sockaddr))) || __copy_from_user(&karg->ca_getfd.gd_path, &arg->ca32_getfd.gd32_path, (NFS_MAXPATHLEN+1)) || __get_user(karg->ca_getfd.gd_version, &arg->ca32_getfd.gd32_version)) return -EFAULT; return 0; } static int compat_nfs_getfs_trans(struct nfsctl_arg *karg, struct compat_nfsctl_arg __user *arg) { if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) || get_user(karg->ca_version, &arg->ca32_version) || __copy_from_user(&karg->ca_getfs.gd_addr, &arg->ca32_getfs.gd32_addr, (sizeof(struct sockaddr))) || __copy_from_user(&karg->ca_getfs.gd_path, &arg->ca32_getfs.gd32_path, (NFS_MAXPATHLEN+1)) || __get_user(karg->ca_getfs.gd_maxlen, &arg->ca32_getfs.gd32_maxlen)) return -EFAULT; return 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; break; } if (err) 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 #ifdef CONFIG_EPOLL #ifdef HAVE_SET_RESTORE_SIGMASK asmlinkage long compat_sys_epoll_pwait(int epfd, struct compat_epoll_event __user *events, int maxevents, int timeout, const compat_sigset_t __user *sigmask, compat_size_t sigsetsize) { long err; compat_sigset_t csigmask; sigset_t ksigmask, sigsaved; /* * If the caller wants a certain signal mask to be set during the wait, * we apply it here. */ if (sigmask) { if (sigsetsize != sizeof(compat_sigset_t)) return -EINVAL; if (copy_from_user(&csigmask, sigmask, sizeof(csigmask))) return -EFAULT; sigset_from_compat(&ksigmask, &csigmask); sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP)); sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); } err = sys_epoll_wait(epfd, events, maxevents, timeout); /* * If we changed the signal mask, we need to restore the original one. * In case we've got a signal while waiting, we do not restore the * signal mask yet, and we allow do_signal() to deliver the signal on * the way back to userspace, before the signal mask is restored. */ if (sigmask) { if (err == -EINTR) { memcpy(¤t->saved_sigmask, &sigsaved, sizeof(sigsaved)); set_restore_sigmask(); } else sigprocmask(SIG_SETMASK, &sigsaved, NULL); } return err; } #endif /* HAVE_SET_RESTORE_SIGMASK */ #endif /* CONFIG_EPOLL */ #ifdef CONFIG_SIGNALFD asmlinkage long compat_sys_signalfd(int ufd, const compat_sigset_t __user *sigmask, compat_size_t sigsetsize) { compat_sigset_t ss32; sigset_t tmp; sigset_t __user *ksigmask; if (sigsetsize != sizeof(compat_sigset_t)) return -EINVAL; if (copy_from_user(&ss32, sigmask, sizeof(ss32))) return -EFAULT; sigset_from_compat(&tmp, &ss32); ksigmask = compat_alloc_user_space(sizeof(sigset_t)); if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t))) return -EFAULT; return sys_signalfd(ufd, ksigmask, sizeof(sigset_t)); } #endif /* CONFIG_SIGNALFD */ #ifdef CONFIG_TIMERFD asmlinkage long compat_sys_timerfd_settime(int ufd, int flags, const struct compat_itimerspec __user *utmr, struct compat_itimerspec __user *otmr) { int error; struct itimerspec t; struct itimerspec __user *ut; if (get_compat_itimerspec(&t, utmr)) return -EFAULT; ut = compat_alloc_user_space(2 * sizeof(struct itimerspec)); if (copy_to_user(&ut[0], &t, sizeof(t))) return -EFAULT; error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]); if (!error && otmr) error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) || put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; return error; } asmlinkage long compat_sys_timerfd_gettime(int ufd, struct compat_itimerspec __user *otmr) { int error; struct itimerspec t; struct itimerspec __user *ut; ut = compat_alloc_user_space(sizeof(struct itimerspec)); error = sys_timerfd_gettime(ufd, ut); if (!error) error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) || put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0; return error; } #endif /* CONFIG_TIMERFD */