/* * linux/fs/open.c * * Copyright (C) 1991, 1992 Linus Torvalds */ #include <linux/string.h> #include <linux/mm.h> #include <linux/utime.h> #include <linux/file.h> #include <linux/smp_lock.h> #include <linux/quotaops.h> #include <linux/fsnotify.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/namei.h> #include <linux/backing-dev.h> #include <linux/capability.h> #include <linux/security.h> #include <linux/mount.h> #include <linux/vfs.h> #include <linux/fcntl.h> #include <asm/uaccess.h> #include <linux/fs.h> #include <linux/personality.h> #include <linux/pagemap.h> #include <linux/syscalls.h> #include <linux/rcupdate.h> #include <linux/audit.h> #include <asm/unistd.h> int vfs_statfs(struct super_block *sb, struct kstatfs *buf) { int retval = -ENODEV; if (sb) { retval = -ENOSYS; if (sb->s_op->statfs) { memset(buf, 0, sizeof(*buf)); retval = security_sb_statfs(sb); if (retval) return retval; retval = sb->s_op->statfs(sb, buf); if (retval == 0 && buf->f_frsize == 0) buf->f_frsize = buf->f_bsize; } } return retval; } EXPORT_SYMBOL(vfs_statfs); static int vfs_statfs_native(struct super_block *sb, struct statfs *buf) { struct kstatfs st; int retval; retval = vfs_statfs(sb, &st); if (retval) return retval; if (sizeof(*buf) == sizeof(st)) memcpy(buf, &st, sizeof(st)); else { if (sizeof buf->f_blocks == 4) { if ((st.f_blocks | st.f_bfree | st.f_bavail) & 0xffffffff00000000ULL) return -EOVERFLOW; /* * f_files and f_ffree may be -1; it's okay to stuff * that into 32 bits */ if (st.f_files != -1 && (st.f_files & 0xffffffff00000000ULL)) return -EOVERFLOW; if (st.f_ffree != -1 && (st.f_ffree & 0xffffffff00000000ULL)) return -EOVERFLOW; } buf->f_type = st.f_type; buf->f_bsize = st.f_bsize; buf->f_blocks = st.f_blocks; buf->f_bfree = st.f_bfree; buf->f_bavail = st.f_bavail; buf->f_files = st.f_files; buf->f_ffree = st.f_ffree; buf->f_fsid = st.f_fsid; buf->f_namelen = st.f_namelen; buf->f_frsize = st.f_frsize; memset(buf->f_spare, 0, sizeof(buf->f_spare)); } return 0; } static int vfs_statfs64(struct super_block *sb, struct statfs64 *buf) { struct kstatfs st; int retval; retval = vfs_statfs(sb, &st); if (retval) return retval; if (sizeof(*buf) == sizeof(st)) memcpy(buf, &st, sizeof(st)); else { buf->f_type = st.f_type; buf->f_bsize = st.f_bsize; buf->f_blocks = st.f_blocks; buf->f_bfree = st.f_bfree; buf->f_bavail = st.f_bavail; buf->f_files = st.f_files; buf->f_ffree = st.f_ffree; buf->f_fsid = st.f_fsid; buf->f_namelen = st.f_namelen; buf->f_frsize = st.f_frsize; memset(buf->f_spare, 0, sizeof(buf->f_spare)); } return 0; } asmlinkage long sys_statfs(const char __user * path, struct statfs __user * buf) { struct nameidata nd; int error; error = user_path_walk(path, &nd); if (!error) { struct statfs tmp; error = vfs_statfs_native(nd.dentry->d_inode->i_sb, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; path_release(&nd); } return error; } asmlinkage long sys_statfs64(const char __user *path, size_t sz, struct statfs64 __user *buf) { struct nameidata nd; long error; if (sz != sizeof(*buf)) return -EINVAL; error = user_path_walk(path, &nd); if (!error) { struct statfs64 tmp; error = vfs_statfs64(nd.dentry->d_inode->i_sb, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; path_release(&nd); } return error; } asmlinkage long sys_fstatfs(unsigned int fd, struct statfs __user * buf) { struct file * file; struct statfs tmp; int error; error = -EBADF; file = fget(fd); if (!file) goto out; error = vfs_statfs_native(file->f_dentry->d_inode->i_sb, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; fput(file); out: return error; } asmlinkage long sys_fstatfs64(unsigned int fd, size_t sz, struct statfs64 __user *buf) { struct file * file; struct statfs64 tmp; int error; if (sz != sizeof(*buf)) return -EINVAL; error = -EBADF; file = fget(fd); if (!file) goto out; error = vfs_statfs64(file->f_dentry->d_inode->i_sb, &tmp); if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) error = -EFAULT; fput(file); out: return error; } int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, struct file *filp) { int err; struct iattr newattrs; /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */ if (length < 0) return -EINVAL; newattrs.ia_size = length; newattrs.ia_valid = ATTR_SIZE | time_attrs; if (filp) { newattrs.ia_file = filp; newattrs.ia_valid |= ATTR_FILE; } mutex_lock(&dentry->d_inode->i_mutex); err = notify_change(dentry, &newattrs); mutex_unlock(&dentry->d_inode->i_mutex); return err; } static long do_sys_truncate(const char __user * path, loff_t length) { struct nameidata nd; struct inode * inode; int error; error = -EINVAL; if (length < 0) /* sorry, but loff_t says... */ goto out; error = user_path_walk(path, &nd); if (error) goto out; inode = nd.dentry->d_inode; /* For directories it's -EISDIR, for other non-regulars - -EINVAL */ error = -EISDIR; if (S_ISDIR(inode->i_mode)) goto dput_and_out; error = -EINVAL; if (!S_ISREG(inode->i_mode)) goto dput_and_out; error = vfs_permission(&nd, MAY_WRITE); if (error) goto dput_and_out; error = -EROFS; if (IS_RDONLY(inode)) goto dput_and_out; error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) goto dput_and_out; /* * Make sure that there are no leases. */ error = break_lease(inode, FMODE_WRITE); if (error) goto dput_and_out; error = get_write_access(inode); if (error) goto dput_and_out; error = locks_verify_truncate(inode, NULL, length); if (!error) { DQUOT_INIT(inode); error = do_truncate(nd.dentry, length, 0, NULL); } put_write_access(inode); dput_and_out: path_release(&nd); out: return error; } asmlinkage long sys_truncate(const char __user * path, unsigned long length) { /* on 32-bit boxen it will cut the range 2^31--2^32-1 off */ return do_sys_truncate(path, (long)length); } static long do_sys_ftruncate(unsigned int fd, loff_t length, int small) { struct inode * inode; struct dentry *dentry; struct file * file; int error; error = -EINVAL; if (length < 0) goto out; error = -EBADF; file = fget(fd); if (!file) goto out; /* explicitly opened as large or we are on 64-bit box */ if (file->f_flags & O_LARGEFILE) small = 0; dentry = file->f_dentry; inode = dentry->d_inode; error = -EINVAL; if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE)) goto out_putf; error = -EINVAL; /* Cannot ftruncate over 2^31 bytes without large file support */ if (small && length > MAX_NON_LFS) goto out_putf; error = -EPERM; if (IS_APPEND(inode)) goto out_putf; error = locks_verify_truncate(inode, file, length); if (!error) error = do_truncate(dentry, length, 0, file); out_putf: fput(file); out: return error; } asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length) { long ret = do_sys_ftruncate(fd, length, 1); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } /* LFS versions of truncate are only needed on 32 bit machines */ #if BITS_PER_LONG == 32 asmlinkage long sys_truncate64(const char __user * path, loff_t length) { return do_sys_truncate(path, length); } asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length) { long ret = do_sys_ftruncate(fd, length, 0); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } #endif #ifdef __ARCH_WANT_SYS_UTIME /* * sys_utime() can be implemented in user-level using sys_utimes(). * Is this for backwards compatibility? If so, why not move it * into the appropriate arch directory (for those architectures that * need it). */ /* If times==NULL, set access and modification to current time, * must be owner or have write permission. * Else, update from *times, must be owner or super user. */ asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times) { int error; struct nameidata nd; struct inode * inode; struct iattr newattrs; error = user_path_walk(filename, &nd); if (error) goto out; inode = nd.dentry->d_inode; error = -EROFS; if (IS_RDONLY(inode)) goto dput_and_out; /* Don't worry, the checks are done in inode_change_ok() */ newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME; if (times) { error = -EPERM; if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) goto dput_and_out; error = get_user(newattrs.ia_atime.tv_sec, ×->actime); newattrs.ia_atime.tv_nsec = 0; if (!error) error = get_user(newattrs.ia_mtime.tv_sec, ×->modtime); newattrs.ia_mtime.tv_nsec = 0; if (error) goto dput_and_out; newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET; } else { error = -EACCES; if (IS_IMMUTABLE(inode)) goto dput_and_out; if (current->fsuid != inode->i_uid && (error = vfs_permission(&nd, MAY_WRITE)) != 0) goto dput_and_out; } mutex_lock(&inode->i_mutex); error = notify_change(nd.dentry, &newattrs); mutex_unlock(&inode->i_mutex); dput_and_out: path_release(&nd); out: return error; } #endif /* If times==NULL, set access and modification to current time, * must be owner or have write permission. * Else, update from *times, must be owner or super user. */ long do_utimes(int dfd, char __user *filename, struct timeval *times) { int error; struct nameidata nd; struct inode * inode; struct iattr newattrs; error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd); if (error) goto out; inode = nd.dentry->d_inode; error = -EROFS; if (IS_RDONLY(inode)) goto dput_and_out; /* Don't worry, the checks are done in inode_change_ok() */ newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME; if (times) { error = -EPERM; if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) goto dput_and_out; newattrs.ia_atime.tv_sec = times[0].tv_sec; newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000; newattrs.ia_mtime.tv_sec = times[1].tv_sec; newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000; newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET; } else { error = -EACCES; if (IS_IMMUTABLE(inode)) goto dput_and_out; if (current->fsuid != inode->i_uid && (error = vfs_permission(&nd, MAY_WRITE)) != 0) goto dput_and_out; } mutex_lock(&inode->i_mutex); error = notify_change(nd.dentry, &newattrs); mutex_unlock(&inode->i_mutex); dput_and_out: path_release(&nd); out: return error; } asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes) { struct timeval times[2]; if (utimes && copy_from_user(×, utimes, sizeof(times))) return -EFAULT; return do_utimes(dfd, filename, utimes ? times : NULL); } asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes) { return sys_futimesat(AT_FDCWD, filename, utimes); } /* * access() needs to use the real uid/gid, not the effective uid/gid. * We do this by temporarily clearing all FS-related capabilities and * switching the fsuid/fsgid around to the real ones. */ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode) { struct nameidata nd; int old_fsuid, old_fsgid; kernel_cap_t old_cap; int res; if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */ return -EINVAL; old_fsuid = current->fsuid; old_fsgid = current->fsgid; old_cap = current->cap_effective; current->fsuid = current->uid; current->fsgid = current->gid; /* * Clear the capabilities if we switch to a non-root user * * FIXME: There is a race here against sys_capset. The * capabilities can change yet we will restore the old * value below. We should hold task_capabilities_lock, * but we cannot because user_path_walk can sleep. */ if (current->uid) cap_clear(current->cap_effective); else current->cap_effective = current->cap_permitted; res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd); if (!res) { res = vfs_permission(&nd, mode); /* SuS v2 requires we report a read only fs too */ if(!res && (mode & S_IWOTH) && IS_RDONLY(nd.dentry->d_inode) && !special_file(nd.dentry->d_inode->i_mode)) res = -EROFS; path_release(&nd); } current->fsuid = old_fsuid; current->fsgid = old_fsgid; current->cap_effective = old_cap; return res; } asmlinkage long sys_access(const char __user *filename, int mode) { return sys_faccessat(AT_FDCWD, filename, mode); } asmlinkage long sys_chdir(const char __user * filename) { struct nameidata nd; int error; error = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &nd); if (error) goto out; error = vfs_permission(&nd, MAY_EXEC); if (error) goto dput_and_out; set_fs_pwd(current->fs, nd.mnt, nd.dentry); dput_and_out: path_release(&nd); out: return error; } asmlinkage long sys_fchdir(unsigned int fd) { struct file *file; struct dentry *dentry; struct inode *inode; struct vfsmount *mnt; int error; error = -EBADF; file = fget(fd); if (!file) goto out; dentry = file->f_dentry; mnt = file->f_vfsmnt; inode = dentry->d_inode; error = -ENOTDIR; if (!S_ISDIR(inode->i_mode)) goto out_putf; error = file_permission(file, MAY_EXEC); if (!error) set_fs_pwd(current->fs, mnt, dentry); out_putf: fput(file); out: return error; } asmlinkage long sys_chroot(const char __user * filename) { struct nameidata nd; int error; error = __user_walk(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY | LOOKUP_NOALT, &nd); if (error) goto out; error = vfs_permission(&nd, MAY_EXEC); if (error) goto dput_and_out; error = -EPERM; if (!capable(CAP_SYS_CHROOT)) goto dput_and_out; set_fs_root(current->fs, nd.mnt, nd.dentry); set_fs_altroot(); error = 0; dput_and_out: path_release(&nd); out: return error; } asmlinkage long sys_fchmod(unsigned int fd, mode_t mode) { struct inode * inode; struct dentry * dentry; struct file * file; int err = -EBADF; struct iattr newattrs; file = fget(fd); if (!file) goto out; dentry = file->f_dentry; inode = dentry->d_inode; audit_inode(NULL, inode, 0); err = -EROFS; if (IS_RDONLY(inode)) goto out_putf; err = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) goto out_putf; mutex_lock(&inode->i_mutex); if (mode == (mode_t) -1) mode = inode->i_mode; newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; err = notify_change(dentry, &newattrs); mutex_unlock(&inode->i_mutex); out_putf: fput(file); out: return err; } asmlinkage long sys_fchmodat(int dfd, const char __user *filename, mode_t mode) { struct nameidata nd; struct inode * inode; int error; struct iattr newattrs; error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd); if (error) goto out; inode = nd.dentry->d_inode; error = -EROFS; if (IS_RDONLY(inode)) goto dput_and_out; error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) goto dput_and_out; mutex_lock(&inode->i_mutex); if (mode == (mode_t) -1) mode = inode->i_mode; newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; error = notify_change(nd.dentry, &newattrs); mutex_unlock(&inode->i_mutex); dput_and_out: path_release(&nd); out: return error; } asmlinkage long sys_chmod(const char __user *filename, mode_t mode) { return sys_fchmodat(AT_FDCWD, filename, mode); } static int chown_common(struct dentry * dentry, uid_t user, gid_t group) { struct inode * inode; int error; struct iattr newattrs; error = -ENOENT; if (!(inode = dentry->d_inode)) { printk(KERN_ERR "chown_common: NULL inode\n"); goto out; } error = -EROFS; if (IS_RDONLY(inode)) goto out; error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) goto out; newattrs.ia_valid = ATTR_CTIME; if (user != (uid_t) -1) { newattrs.ia_valid |= ATTR_UID; newattrs.ia_uid = user; } if (group != (gid_t) -1) { newattrs.ia_valid |= ATTR_GID; newattrs.ia_gid = group; } if (!S_ISDIR(inode->i_mode)) newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID; mutex_lock(&inode->i_mutex); error = notify_change(dentry, &newattrs); mutex_unlock(&inode->i_mutex); out: return error; } asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group) { struct nameidata nd; int error; error = user_path_walk(filename, &nd); if (!error) { error = chown_common(nd.dentry, user, group); path_release(&nd); } return error; } asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group, int flag) { struct nameidata nd; int error = -EINVAL; int follow; if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) goto out; follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW; error = __user_walk_fd(dfd, filename, follow, &nd); if (!error) { error = chown_common(nd.dentry, user, group); path_release(&nd); } out: return error; } asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group) { struct nameidata nd; int error; error = user_path_walk_link(filename, &nd); if (!error) { error = chown_common(nd.dentry, user, group); path_release(&nd); } return error; } asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group) { struct file * file; int error = -EBADF; file = fget(fd); if (file) { struct dentry * dentry; dentry = file->f_dentry; audit_inode(NULL, dentry->d_inode, 0); error = chown_common(dentry, user, group); fput(file); } return error; } static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags, struct file *f, int (*open)(struct inode *, struct file *)) { struct inode *inode; int error; f->f_flags = flags; f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE; inode = dentry->d_inode; if (f->f_mode & FMODE_WRITE) { error = get_write_access(inode); if (error) goto cleanup_file; } f->f_mapping = inode->i_mapping; f->f_dentry = dentry; f->f_vfsmnt = mnt; f->f_pos = 0; f->f_op = fops_get(inode->i_fop); file_move(f, &inode->i_sb->s_files); if (!open && f->f_op) open = f->f_op->open; if (open) { error = open(inode, f); if (error) goto cleanup_all; } f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping); /* NB: we're sure to have correct a_ops only after f_op->open */ if (f->f_flags & O_DIRECT) { if (!f->f_mapping->a_ops || ((!f->f_mapping->a_ops->direct_IO) && (!f->f_mapping->a_ops->get_xip_page))) { fput(f); f = ERR_PTR(-EINVAL); } } return f; cleanup_all: fops_put(f->f_op); if (f->f_mode & FMODE_WRITE) put_write_access(inode); file_kill(f); f->f_dentry = NULL; f->f_vfsmnt = NULL; cleanup_file: put_filp(f); dput(dentry); mntput(mnt); return ERR_PTR(error); } /* * Note that while the flag value (low two bits) for sys_open means: * 00 - read-only * 01 - write-only * 10 - read-write * 11 - special * it is changed into * 00 - no permissions needed * 01 - read-permission * 10 - write-permission * 11 - read-write * for the internal routines (ie open_namei()/follow_link() etc). 00 is * used by symlinks. */ static struct file *do_filp_open(int dfd, const char *filename, int flags, int mode) { int namei_flags, error; struct nameidata nd; namei_flags = flags; if ((namei_flags+1) & O_ACCMODE) namei_flags++; error = open_namei(dfd, filename, namei_flags, mode, &nd); if (!error) return nameidata_to_filp(&nd, flags); return ERR_PTR(error); } struct file *filp_open(const char *filename, int flags, int mode) { return do_filp_open(AT_FDCWD, filename, flags, mode); } EXPORT_SYMBOL(filp_open); /** * lookup_instantiate_filp - instantiates the open intent filp * @nd: pointer to nameidata * @dentry: pointer to dentry * @open: open callback * * Helper for filesystems that want to use lookup open intents and pass back * a fully instantiated struct file to the caller. * This function is meant to be called from within a filesystem's * lookup method. * Beware of calling it for non-regular files! Those ->open methods might block * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo, * leading to a deadlock, as nobody can open that fifo anymore, because * another process to open fifo will block on locked parent when doing lookup). * Note that in case of error, nd->intent.open.file is destroyed, but the * path information remains valid. * If the open callback is set to NULL, then the standard f_op->open() * filesystem callback is substituted. */ struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, int (*open)(struct inode *, struct file *)) { if (IS_ERR(nd->intent.open.file)) goto out; if (IS_ERR(dentry)) goto out_err; nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->mnt), nd->intent.open.flags - 1, nd->intent.open.file, open); out: return nd->intent.open.file; out_err: release_open_intent(nd); nd->intent.open.file = (struct file *)dentry; goto out; } EXPORT_SYMBOL_GPL(lookup_instantiate_filp); /** * nameidata_to_filp - convert a nameidata to an open filp. * @nd: pointer to nameidata * @flags: open flags * * Note that this function destroys the original nameidata */ struct file *nameidata_to_filp(struct nameidata *nd, int flags) { struct file *filp; /* Pick up the filp from the open intent */ filp = nd->intent.open.file; /* Has the filesystem initialised the file for us? */ if (filp->f_dentry == NULL) filp = __dentry_open(nd->dentry, nd->mnt, flags, filp, NULL); else path_release(nd); return filp; } /* * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an * error. */ struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags) { int error; struct file *f; error = -ENFILE; f = get_empty_filp(); if (f == NULL) { dput(dentry); mntput(mnt); return ERR_PTR(error); } return __dentry_open(dentry, mnt, flags, f, NULL); } EXPORT_SYMBOL(dentry_open); /* * Find an empty file descriptor entry, and mark it busy. */ int get_unused_fd(void) { struct files_struct * files = current->files; int fd, error; struct fdtable *fdt; error = -EMFILE; spin_lock(&files->file_lock); repeat: fdt = files_fdtable(files); fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fdset, files->next_fd); /* * N.B. For clone tasks sharing a files structure, this test * will limit the total number of files that can be opened. */ if (fd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur) goto out; /* Do we need to expand the fd array or fd set? */ error = expand_files(files, fd); if (error < 0) goto out; if (error) { /* * If we needed to expand the fs array we * might have blocked - try again. */ error = -EMFILE; goto repeat; } FD_SET(fd, fdt->open_fds); FD_CLR(fd, fdt->close_on_exec); files->next_fd = fd + 1; #if 1 /* Sanity check */ if (fdt->fd[fd] != NULL) { printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd); fdt->fd[fd] = NULL; } #endif error = fd; out: spin_unlock(&files->file_lock); return error; } EXPORT_SYMBOL(get_unused_fd); static void __put_unused_fd(struct files_struct *files, unsigned int fd) { struct fdtable *fdt = files_fdtable(files); __FD_CLR(fd, fdt->open_fds); if (fd < files->next_fd) files->next_fd = fd; } void fastcall put_unused_fd(unsigned int fd) { struct files_struct *files = current->files; spin_lock(&files->file_lock); __put_unused_fd(files, fd); spin_unlock(&files->file_lock); } EXPORT_SYMBOL(put_unused_fd); /* * Install a file pointer in the fd array. * * The VFS is full of places where we drop the files lock between * setting the open_fds bitmap and installing the file in the file * array. At any such point, we are vulnerable to a dup2() race * installing a file in the array before us. We need to detect this and * fput() the struct file we are about to overwrite in this case. * * It should never happen - if we allow dup2() do it, _really_ bad things * will follow. */ void fastcall fd_install(unsigned int fd, struct file * file) { struct files_struct *files = current->files; struct fdtable *fdt; spin_lock(&files->file_lock); fdt = files_fdtable(files); BUG_ON(fdt->fd[fd] != NULL); rcu_assign_pointer(fdt->fd[fd], file); spin_unlock(&files->file_lock); } EXPORT_SYMBOL(fd_install); long do_sys_open(int dfd, const char __user *filename, int flags, int mode) { char *tmp = getname(filename); int fd = PTR_ERR(tmp); if (!IS_ERR(tmp)) { fd = get_unused_fd(); if (fd >= 0) { struct file *f = do_filp_open(dfd, tmp, flags, mode); if (IS_ERR(f)) { put_unused_fd(fd); fd = PTR_ERR(f); } else { fsnotify_open(f->f_dentry); fd_install(fd, f); } } putname(tmp); } return fd; } asmlinkage long sys_open(const char __user *filename, int flags, int mode) { long ret; if (force_o_largefile()) flags |= O_LARGEFILE; ret = do_sys_open(AT_FDCWD, filename, flags, mode); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } EXPORT_SYMBOL_GPL(sys_open); asmlinkage long sys_openat(int dfd, const char __user *filename, int flags, int mode) { long ret; if (force_o_largefile()) flags |= O_LARGEFILE; ret = do_sys_open(dfd, filename, flags, mode); /* avoid REGPARM breakage on x86: */ prevent_tail_call(ret); return ret; } EXPORT_SYMBOL_GPL(sys_openat); #ifndef __alpha__ /* * For backward compatibility? Maybe this should be moved * into arch/i386 instead? */ asmlinkage long sys_creat(const char __user * pathname, int mode) { return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode); } #endif /* * "id" is the POSIX thread ID. We use the * files pointer for this.. */ int filp_close(struct file *filp, fl_owner_t id) { int retval = 0; if (!file_count(filp)) { printk(KERN_ERR "VFS: Close: file count is 0\n"); return 0; } if (filp->f_op && filp->f_op->flush) retval = filp->f_op->flush(filp); dnotify_flush(filp, id); locks_remove_posix(filp, id); fput(filp); return retval; } EXPORT_SYMBOL(filp_close); /* * Careful here! We test whether the file pointer is NULL before * releasing the fd. This ensures that one clone task can't release * an fd while another clone is opening it. */ asmlinkage long sys_close(unsigned int fd) { struct file * filp; struct files_struct *files = current->files; struct fdtable *fdt; spin_lock(&files->file_lock); fdt = files_fdtable(files); if (fd >= fdt->max_fds) goto out_unlock; filp = fdt->fd[fd]; if (!filp) goto out_unlock; rcu_assign_pointer(fdt->fd[fd], NULL); FD_CLR(fd, fdt->close_on_exec); __put_unused_fd(files, fd); spin_unlock(&files->file_lock); return filp_close(filp, files); out_unlock: spin_unlock(&files->file_lock); return -EBADF; } EXPORT_SYMBOL(sys_close); /* * This routine simulates a hangup on the tty, to arrange that users * are given clean terminals at login time. */ asmlinkage long sys_vhangup(void) { if (capable(CAP_SYS_TTY_CONFIG)) { tty_vhangup(current->signal->tty); return 0; } return -EPERM; } /* * Called when an inode is about to be open. * We use this to disallow opening large files on 32bit systems if * the caller didn't specify O_LARGEFILE. On 64bit systems we force * on this flag in sys_open. */ int generic_file_open(struct inode * inode, struct file * filp) { if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) return -EFBIG; return 0; } EXPORT_SYMBOL(generic_file_open); /* * This is used by subsystems that don't want seekable * file descriptors */ int nonseekable_open(struct inode *inode, struct file *filp) { filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE); return 0; } EXPORT_SYMBOL(nonseekable_open);