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![Linus Torvalds](/assets/img/avatar_default.png)
Our write() system call has always been atomic in the sense that you get the expected thread-safe contiguous write, but we haven't actually guaranteed that concurrent writes are serialized wrt f_pos accesses, so threads (or processes) that share a file descriptor and use "write()" concurrently would quite likely overwrite each others data. This violates POSIX.1-2008/SUSv4 Section XSI 2.9.7 that says: "2.9.7 Thread Interactions with Regular File Operations All of the following functions shall be atomic with respect to each other in the effects specified in POSIX.1-2008 when they operate on regular files or symbolic links: [...]" and one of the effects is the file position update. This unprotected file position behavior is not new behavior, and nobody has ever cared. Until now. Yongzhi Pan reported unexpected behavior to Michael Kerrisk that was due to this. This resolves the issue with a f_pos-specific lock that is taken by read/write/lseek on file descriptors that may be shared across threads or processes. Reported-by: Yongzhi Pan <panyongzhi@gmail.com> Reported-by: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1119 lines
26 KiB
C
1119 lines
26 KiB
C
/*
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* linux/fs/open.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/fsnotify.h>
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/namei.h>
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#include <linux/backing-dev.h>
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#include <linux/capability.h>
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#include <linux/securebits.h>
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#include <linux/security.h>
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#include <linux/mount.h>
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#include <linux/fcntl.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <linux/fs.h>
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#include <linux/personality.h>
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#include <linux/pagemap.h>
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#include <linux/syscalls.h>
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#include <linux/rcupdate.h>
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#include <linux/audit.h>
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#include <linux/falloc.h>
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#include <linux/fs_struct.h>
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#include <linux/ima.h>
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#include <linux/dnotify.h>
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#include <linux/compat.h>
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#include "internal.h"
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int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
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struct file *filp)
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{
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int ret;
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struct iattr newattrs;
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/* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
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if (length < 0)
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return -EINVAL;
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newattrs.ia_size = length;
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newattrs.ia_valid = ATTR_SIZE | time_attrs;
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if (filp) {
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newattrs.ia_file = filp;
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newattrs.ia_valid |= ATTR_FILE;
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}
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/* Remove suid/sgid on truncate too */
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ret = should_remove_suid(dentry);
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if (ret)
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newattrs.ia_valid |= ret | ATTR_FORCE;
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mutex_lock(&dentry->d_inode->i_mutex);
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/* Note any delegations or leases have already been broken: */
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ret = notify_change(dentry, &newattrs, NULL);
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mutex_unlock(&dentry->d_inode->i_mutex);
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return ret;
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}
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long vfs_truncate(struct path *path, loff_t length)
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{
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struct inode *inode;
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long error;
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inode = path->dentry->d_inode;
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/* For directories it's -EISDIR, for other non-regulars - -EINVAL */
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if (S_ISDIR(inode->i_mode))
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return -EISDIR;
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if (!S_ISREG(inode->i_mode))
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return -EINVAL;
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error = mnt_want_write(path->mnt);
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if (error)
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goto out;
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error = inode_permission(inode, MAY_WRITE);
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if (error)
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goto mnt_drop_write_and_out;
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error = -EPERM;
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if (IS_APPEND(inode))
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goto mnt_drop_write_and_out;
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error = get_write_access(inode);
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if (error)
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goto mnt_drop_write_and_out;
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/*
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* Make sure that there are no leases. get_write_access() protects
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* against the truncate racing with a lease-granting setlease().
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*/
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error = break_lease(inode, O_WRONLY);
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if (error)
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goto put_write_and_out;
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error = locks_verify_truncate(inode, NULL, length);
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if (!error)
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error = security_path_truncate(path);
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if (!error)
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error = do_truncate(path->dentry, length, 0, NULL);
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put_write_and_out:
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put_write_access(inode);
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mnt_drop_write_and_out:
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mnt_drop_write(path->mnt);
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out:
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return error;
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}
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EXPORT_SYMBOL_GPL(vfs_truncate);
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static long do_sys_truncate(const char __user *pathname, loff_t length)
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{
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unsigned int lookup_flags = LOOKUP_FOLLOW;
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struct path path;
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int error;
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if (length < 0) /* sorry, but loff_t says... */
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return -EINVAL;
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retry:
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error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
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if (!error) {
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error = vfs_truncate(&path, length);
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path_put(&path);
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}
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if (retry_estale(error, lookup_flags)) {
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lookup_flags |= LOOKUP_REVAL;
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goto retry;
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}
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return error;
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}
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SYSCALL_DEFINE2(truncate, const char __user *, path, long, length)
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{
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return do_sys_truncate(path, length);
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}
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#ifdef CONFIG_COMPAT
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COMPAT_SYSCALL_DEFINE2(truncate, const char __user *, path, compat_off_t, length)
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{
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return do_sys_truncate(path, length);
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}
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#endif
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static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
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{
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struct inode *inode;
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struct dentry *dentry;
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struct fd f;
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int error;
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error = -EINVAL;
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if (length < 0)
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goto out;
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error = -EBADF;
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f = fdget(fd);
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if (!f.file)
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goto out;
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/* explicitly opened as large or we are on 64-bit box */
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if (f.file->f_flags & O_LARGEFILE)
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small = 0;
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dentry = f.file->f_path.dentry;
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inode = dentry->d_inode;
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error = -EINVAL;
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if (!S_ISREG(inode->i_mode) || !(f.file->f_mode & FMODE_WRITE))
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goto out_putf;
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error = -EINVAL;
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/* Cannot ftruncate over 2^31 bytes without large file support */
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if (small && length > MAX_NON_LFS)
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goto out_putf;
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error = -EPERM;
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if (IS_APPEND(inode))
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goto out_putf;
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sb_start_write(inode->i_sb);
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error = locks_verify_truncate(inode, f.file, length);
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if (!error)
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error = security_path_truncate(&f.file->f_path);
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if (!error)
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error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, f.file);
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sb_end_write(inode->i_sb);
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out_putf:
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fdput(f);
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out:
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return error;
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}
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SYSCALL_DEFINE2(ftruncate, unsigned int, fd, unsigned long, length)
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{
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return do_sys_ftruncate(fd, length, 1);
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}
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#ifdef CONFIG_COMPAT
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COMPAT_SYSCALL_DEFINE2(ftruncate, unsigned int, fd, compat_ulong_t, length)
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{
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return do_sys_ftruncate(fd, length, 1);
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}
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#endif
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/* LFS versions of truncate are only needed on 32 bit machines */
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#if BITS_PER_LONG == 32
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SYSCALL_DEFINE2(truncate64, const char __user *, path, loff_t, length)
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{
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return do_sys_truncate(path, length);
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}
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SYSCALL_DEFINE2(ftruncate64, unsigned int, fd, loff_t, length)
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{
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return do_sys_ftruncate(fd, length, 0);
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}
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#endif /* BITS_PER_LONG == 32 */
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int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
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{
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struct inode *inode = file_inode(file);
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long ret;
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if (offset < 0 || len <= 0)
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return -EINVAL;
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/* Return error if mode is not supported */
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if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
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return -EOPNOTSUPP;
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/* Punch hole must have keep size set */
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if ((mode & FALLOC_FL_PUNCH_HOLE) &&
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!(mode & FALLOC_FL_KEEP_SIZE))
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return -EOPNOTSUPP;
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if (!(file->f_mode & FMODE_WRITE))
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return -EBADF;
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/* It's not possible punch hole on append only file */
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if (mode & FALLOC_FL_PUNCH_HOLE && IS_APPEND(inode))
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return -EPERM;
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if (IS_IMMUTABLE(inode))
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return -EPERM;
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/*
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* Revalidate the write permissions, in case security policy has
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* changed since the files were opened.
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*/
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ret = security_file_permission(file, MAY_WRITE);
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if (ret)
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return ret;
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if (S_ISFIFO(inode->i_mode))
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return -ESPIPE;
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/*
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* Let individual file system decide if it supports preallocation
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* for directories or not.
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*/
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if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
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return -ENODEV;
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/* Check for wrap through zero too */
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if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
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return -EFBIG;
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if (!file->f_op->fallocate)
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return -EOPNOTSUPP;
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sb_start_write(inode->i_sb);
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ret = file->f_op->fallocate(file, mode, offset, len);
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sb_end_write(inode->i_sb);
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return ret;
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}
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SYSCALL_DEFINE4(fallocate, int, fd, int, mode, loff_t, offset, loff_t, len)
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{
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struct fd f = fdget(fd);
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int error = -EBADF;
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if (f.file) {
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error = do_fallocate(f.file, mode, offset, len);
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fdput(f);
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}
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return error;
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}
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/*
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* access() needs to use the real uid/gid, not the effective uid/gid.
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* We do this by temporarily clearing all FS-related capabilities and
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* switching the fsuid/fsgid around to the real ones.
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*/
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SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode)
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{
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const struct cred *old_cred;
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struct cred *override_cred;
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struct path path;
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struct inode *inode;
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int res;
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unsigned int lookup_flags = LOOKUP_FOLLOW;
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if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
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return -EINVAL;
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override_cred = prepare_creds();
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if (!override_cred)
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return -ENOMEM;
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override_cred->fsuid = override_cred->uid;
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override_cred->fsgid = override_cred->gid;
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if (!issecure(SECURE_NO_SETUID_FIXUP)) {
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/* Clear the capabilities if we switch to a non-root user */
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kuid_t root_uid = make_kuid(override_cred->user_ns, 0);
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if (!uid_eq(override_cred->uid, root_uid))
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cap_clear(override_cred->cap_effective);
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else
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override_cred->cap_effective =
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override_cred->cap_permitted;
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}
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old_cred = override_creds(override_cred);
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retry:
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res = user_path_at(dfd, filename, lookup_flags, &path);
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if (res)
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goto out;
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inode = path.dentry->d_inode;
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if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
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/*
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* MAY_EXEC on regular files is denied if the fs is mounted
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* with the "noexec" flag.
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*/
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res = -EACCES;
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if (path.mnt->mnt_flags & MNT_NOEXEC)
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goto out_path_release;
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}
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res = inode_permission(inode, mode | MAY_ACCESS);
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/* SuS v2 requires we report a read only fs too */
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if (res || !(mode & S_IWOTH) || special_file(inode->i_mode))
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goto out_path_release;
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/*
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* This is a rare case where using __mnt_is_readonly()
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* is OK without a mnt_want/drop_write() pair. Since
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* no actual write to the fs is performed here, we do
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* not need to telegraph to that to anyone.
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*
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* By doing this, we accept that this access is
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* inherently racy and know that the fs may change
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* state before we even see this result.
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*/
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if (__mnt_is_readonly(path.mnt))
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res = -EROFS;
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out_path_release:
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path_put(&path);
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if (retry_estale(res, lookup_flags)) {
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lookup_flags |= LOOKUP_REVAL;
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goto retry;
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}
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out:
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revert_creds(old_cred);
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put_cred(override_cred);
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return res;
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}
|
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SYSCALL_DEFINE2(access, const char __user *, filename, int, mode)
|
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{
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return sys_faccessat(AT_FDCWD, filename, mode);
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}
|
|
|
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SYSCALL_DEFINE1(chdir, const char __user *, filename)
|
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{
|
|
struct path path;
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|
int error;
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unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
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retry:
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error = user_path_at(AT_FDCWD, filename, lookup_flags, &path);
|
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if (error)
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goto out;
|
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error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
|
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if (error)
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goto dput_and_out;
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set_fs_pwd(current->fs, &path);
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|
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dput_and_out:
|
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path_put(&path);
|
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if (retry_estale(error, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
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goto retry;
|
|
}
|
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out:
|
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return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE1(fchdir, unsigned int, fd)
|
|
{
|
|
struct fd f = fdget_raw(fd);
|
|
struct inode *inode;
|
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int error = -EBADF;
|
|
|
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error = -EBADF;
|
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if (!f.file)
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goto out;
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|
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inode = file_inode(f.file);
|
|
|
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error = -ENOTDIR;
|
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if (!S_ISDIR(inode->i_mode))
|
|
goto out_putf;
|
|
|
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error = inode_permission(inode, MAY_EXEC | MAY_CHDIR);
|
|
if (!error)
|
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set_fs_pwd(current->fs, &f.file->f_path);
|
|
out_putf:
|
|
fdput(f);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE1(chroot, const char __user *, filename)
|
|
{
|
|
struct path path;
|
|
int error;
|
|
unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
|
|
retry:
|
|
error = user_path_at(AT_FDCWD, filename, lookup_flags, &path);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
|
|
if (error)
|
|
goto dput_and_out;
|
|
|
|
error = -EPERM;
|
|
if (!ns_capable(current_user_ns(), CAP_SYS_CHROOT))
|
|
goto dput_and_out;
|
|
error = security_path_chroot(&path);
|
|
if (error)
|
|
goto dput_and_out;
|
|
|
|
set_fs_root(current->fs, &path);
|
|
error = 0;
|
|
dput_and_out:
|
|
path_put(&path);
|
|
if (retry_estale(error, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
goto retry;
|
|
}
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static int chmod_common(struct path *path, umode_t mode)
|
|
{
|
|
struct inode *inode = path->dentry->d_inode;
|
|
struct inode *delegated_inode = NULL;
|
|
struct iattr newattrs;
|
|
int error;
|
|
|
|
error = mnt_want_write(path->mnt);
|
|
if (error)
|
|
return error;
|
|
retry_deleg:
|
|
mutex_lock(&inode->i_mutex);
|
|
error = security_path_chmod(path, mode);
|
|
if (error)
|
|
goto out_unlock;
|
|
newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
|
|
newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
|
|
error = notify_change(path->dentry, &newattrs, &delegated_inode);
|
|
out_unlock:
|
|
mutex_unlock(&inode->i_mutex);
|
|
if (delegated_inode) {
|
|
error = break_deleg_wait(&delegated_inode);
|
|
if (!error)
|
|
goto retry_deleg;
|
|
}
|
|
mnt_drop_write(path->mnt);
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode)
|
|
{
|
|
struct fd f = fdget(fd);
|
|
int err = -EBADF;
|
|
|
|
if (f.file) {
|
|
audit_inode(NULL, f.file->f_path.dentry, 0);
|
|
err = chmod_common(&f.file->f_path, mode);
|
|
fdput(f);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, umode_t, mode)
|
|
{
|
|
struct path path;
|
|
int error;
|
|
unsigned int lookup_flags = LOOKUP_FOLLOW;
|
|
retry:
|
|
error = user_path_at(dfd, filename, lookup_flags, &path);
|
|
if (!error) {
|
|
error = chmod_common(&path, mode);
|
|
path_put(&path);
|
|
if (retry_estale(error, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
goto retry;
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode)
|
|
{
|
|
return sys_fchmodat(AT_FDCWD, filename, mode);
|
|
}
|
|
|
|
static int chown_common(struct path *path, uid_t user, gid_t group)
|
|
{
|
|
struct inode *inode = path->dentry->d_inode;
|
|
struct inode *delegated_inode = NULL;
|
|
int error;
|
|
struct iattr newattrs;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
|
|
uid = make_kuid(current_user_ns(), user);
|
|
gid = make_kgid(current_user_ns(), group);
|
|
|
|
newattrs.ia_valid = ATTR_CTIME;
|
|
if (user != (uid_t) -1) {
|
|
if (!uid_valid(uid))
|
|
return -EINVAL;
|
|
newattrs.ia_valid |= ATTR_UID;
|
|
newattrs.ia_uid = uid;
|
|
}
|
|
if (group != (gid_t) -1) {
|
|
if (!gid_valid(gid))
|
|
return -EINVAL;
|
|
newattrs.ia_valid |= ATTR_GID;
|
|
newattrs.ia_gid = gid;
|
|
}
|
|
if (!S_ISDIR(inode->i_mode))
|
|
newattrs.ia_valid |=
|
|
ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
|
|
retry_deleg:
|
|
mutex_lock(&inode->i_mutex);
|
|
error = security_path_chown(path, uid, gid);
|
|
if (!error)
|
|
error = notify_change(path->dentry, &newattrs, &delegated_inode);
|
|
mutex_unlock(&inode->i_mutex);
|
|
if (delegated_inode) {
|
|
error = break_deleg_wait(&delegated_inode);
|
|
if (!error)
|
|
goto retry_deleg;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user,
|
|
gid_t, group, int, flag)
|
|
{
|
|
struct path path;
|
|
int error = -EINVAL;
|
|
int lookup_flags;
|
|
|
|
if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
|
|
goto out;
|
|
|
|
lookup_flags = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
|
|
if (flag & AT_EMPTY_PATH)
|
|
lookup_flags |= LOOKUP_EMPTY;
|
|
retry:
|
|
error = user_path_at(dfd, filename, lookup_flags, &path);
|
|
if (error)
|
|
goto out;
|
|
error = mnt_want_write(path.mnt);
|
|
if (error)
|
|
goto out_release;
|
|
error = chown_common(&path, user, group);
|
|
mnt_drop_write(path.mnt);
|
|
out_release:
|
|
path_put(&path);
|
|
if (retry_estale(error, lookup_flags)) {
|
|
lookup_flags |= LOOKUP_REVAL;
|
|
goto retry;
|
|
}
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group)
|
|
{
|
|
return sys_fchownat(AT_FDCWD, filename, user, group, 0);
|
|
}
|
|
|
|
SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group)
|
|
{
|
|
return sys_fchownat(AT_FDCWD, filename, user, group,
|
|
AT_SYMLINK_NOFOLLOW);
|
|
}
|
|
|
|
SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
|
|
{
|
|
struct fd f = fdget(fd);
|
|
int error = -EBADF;
|
|
|
|
if (!f.file)
|
|
goto out;
|
|
|
|
error = mnt_want_write_file(f.file);
|
|
if (error)
|
|
goto out_fput;
|
|
audit_inode(NULL, f.file->f_path.dentry, 0);
|
|
error = chown_common(&f.file->f_path, user, group);
|
|
mnt_drop_write_file(f.file);
|
|
out_fput:
|
|
fdput(f);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* You have to be very careful that these write
|
|
* counts get cleaned up in error cases and
|
|
* upon __fput(). This should probably never
|
|
* be called outside of __dentry_open().
|
|
*/
|
|
static inline int __get_file_write_access(struct inode *inode,
|
|
struct vfsmount *mnt)
|
|
{
|
|
int error;
|
|
error = get_write_access(inode);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Do not take mount writer counts on
|
|
* special files since no writes to
|
|
* the mount itself will occur.
|
|
*/
|
|
if (!special_file(inode->i_mode)) {
|
|
/*
|
|
* Balanced in __fput()
|
|
*/
|
|
error = __mnt_want_write(mnt);
|
|
if (error)
|
|
put_write_access(inode);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
int open_check_o_direct(struct file *f)
|
|
{
|
|
/* 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_mem))) {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_dentry_open(struct file *f,
|
|
int (*open)(struct inode *, struct file *),
|
|
const struct cred *cred)
|
|
{
|
|
static const struct file_operations empty_fops = {};
|
|
struct inode *inode;
|
|
int error;
|
|
|
|
f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
|
|
FMODE_PREAD | FMODE_PWRITE;
|
|
|
|
if (unlikely(f->f_flags & O_PATH))
|
|
f->f_mode = FMODE_PATH;
|
|
|
|
path_get(&f->f_path);
|
|
inode = f->f_inode = f->f_path.dentry->d_inode;
|
|
if (f->f_mode & FMODE_WRITE) {
|
|
error = __get_file_write_access(inode, f->f_path.mnt);
|
|
if (error)
|
|
goto cleanup_file;
|
|
if (!special_file(inode->i_mode))
|
|
file_take_write(f);
|
|
}
|
|
|
|
f->f_mapping = inode->i_mapping;
|
|
|
|
if (unlikely(f->f_mode & FMODE_PATH)) {
|
|
f->f_op = &empty_fops;
|
|
return 0;
|
|
}
|
|
|
|
/* POSIX.1-2008/SUSv4 Section XSI 2.9.7 */
|
|
if (S_ISREG(inode->i_mode))
|
|
f->f_mode |= FMODE_ATOMIC_POS;
|
|
|
|
f->f_op = fops_get(inode->i_fop);
|
|
if (unlikely(WARN_ON(!f->f_op))) {
|
|
error = -ENODEV;
|
|
goto cleanup_all;
|
|
}
|
|
|
|
error = security_file_open(f, cred);
|
|
if (error)
|
|
goto cleanup_all;
|
|
|
|
error = break_lease(inode, f->f_flags);
|
|
if (error)
|
|
goto cleanup_all;
|
|
|
|
if (!open)
|
|
open = f->f_op->open;
|
|
if (open) {
|
|
error = open(inode, f);
|
|
if (error)
|
|
goto cleanup_all;
|
|
}
|
|
if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
|
|
i_readcount_inc(inode);
|
|
|
|
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
|
|
|
|
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
|
|
|
|
return 0;
|
|
|
|
cleanup_all:
|
|
fops_put(f->f_op);
|
|
if (f->f_mode & FMODE_WRITE) {
|
|
put_write_access(inode);
|
|
if (!special_file(inode->i_mode)) {
|
|
/*
|
|
* We don't consider this a real
|
|
* mnt_want/drop_write() pair
|
|
* because it all happenend right
|
|
* here, so just reset the state.
|
|
*/
|
|
file_reset_write(f);
|
|
__mnt_drop_write(f->f_path.mnt);
|
|
}
|
|
}
|
|
cleanup_file:
|
|
path_put(&f->f_path);
|
|
f->f_path.mnt = NULL;
|
|
f->f_path.dentry = NULL;
|
|
f->f_inode = NULL;
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* finish_open - finish opening a file
|
|
* @file: file pointer
|
|
* @dentry: pointer to dentry
|
|
* @open: open callback
|
|
* @opened: state of open
|
|
*
|
|
* This can be used to finish opening a file passed to i_op->atomic_open().
|
|
*
|
|
* If the open callback is set to NULL, then the standard f_op->open()
|
|
* filesystem callback is substituted.
|
|
*
|
|
* NB: the dentry reference is _not_ consumed. If, for example, the dentry is
|
|
* the return value of d_splice_alias(), then the caller needs to perform dput()
|
|
* on it after finish_open().
|
|
*
|
|
* On successful return @file is a fully instantiated open file. After this, if
|
|
* an error occurs in ->atomic_open(), it needs to clean up with fput().
|
|
*
|
|
* Returns zero on success or -errno if the open failed.
|
|
*/
|
|
int finish_open(struct file *file, struct dentry *dentry,
|
|
int (*open)(struct inode *, struct file *),
|
|
int *opened)
|
|
{
|
|
int error;
|
|
BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
|
|
|
|
file->f_path.dentry = dentry;
|
|
error = do_dentry_open(file, open, current_cred());
|
|
if (!error)
|
|
*opened |= FILE_OPENED;
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(finish_open);
|
|
|
|
/**
|
|
* finish_no_open - finish ->atomic_open() without opening the file
|
|
*
|
|
* @file: file pointer
|
|
* @dentry: dentry or NULL (as returned from ->lookup())
|
|
*
|
|
* This can be used to set the result of a successful lookup in ->atomic_open().
|
|
*
|
|
* NB: unlike finish_open() this function does consume the dentry reference and
|
|
* the caller need not dput() it.
|
|
*
|
|
* Returns "1" which must be the return value of ->atomic_open() after having
|
|
* called this function.
|
|
*/
|
|
int finish_no_open(struct file *file, struct dentry *dentry)
|
|
{
|
|
file->f_path.dentry = dentry;
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(finish_no_open);
|
|
|
|
struct file *dentry_open(const struct path *path, int flags,
|
|
const struct cred *cred)
|
|
{
|
|
int error;
|
|
struct file *f;
|
|
|
|
validate_creds(cred);
|
|
|
|
/* We must always pass in a valid mount pointer. */
|
|
BUG_ON(!path->mnt);
|
|
|
|
f = get_empty_filp();
|
|
if (!IS_ERR(f)) {
|
|
f->f_flags = flags;
|
|
f->f_path = *path;
|
|
error = do_dentry_open(f, NULL, cred);
|
|
if (!error) {
|
|
/* from now on we need fput() to dispose of f */
|
|
error = open_check_o_direct(f);
|
|
if (error) {
|
|
fput(f);
|
|
f = ERR_PTR(error);
|
|
}
|
|
} else {
|
|
put_filp(f);
|
|
f = ERR_PTR(error);
|
|
}
|
|
}
|
|
return f;
|
|
}
|
|
EXPORT_SYMBOL(dentry_open);
|
|
|
|
static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op)
|
|
{
|
|
int lookup_flags = 0;
|
|
int acc_mode;
|
|
|
|
if (flags & (O_CREAT | __O_TMPFILE))
|
|
op->mode = (mode & S_IALLUGO) | S_IFREG;
|
|
else
|
|
op->mode = 0;
|
|
|
|
/* Must never be set by userspace */
|
|
flags &= ~FMODE_NONOTIFY & ~O_CLOEXEC;
|
|
|
|
/*
|
|
* O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only
|
|
* check for O_DSYNC if the need any syncing at all we enforce it's
|
|
* always set instead of having to deal with possibly weird behaviour
|
|
* for malicious applications setting only __O_SYNC.
|
|
*/
|
|
if (flags & __O_SYNC)
|
|
flags |= O_DSYNC;
|
|
|
|
if (flags & __O_TMPFILE) {
|
|
if ((flags & O_TMPFILE_MASK) != O_TMPFILE)
|
|
return -EINVAL;
|
|
acc_mode = MAY_OPEN | ACC_MODE(flags);
|
|
if (!(acc_mode & MAY_WRITE))
|
|
return -EINVAL;
|
|
} else if (flags & O_PATH) {
|
|
/*
|
|
* If we have O_PATH in the open flag. Then we
|
|
* cannot have anything other than the below set of flags
|
|
*/
|
|
flags &= O_DIRECTORY | O_NOFOLLOW | O_PATH;
|
|
acc_mode = 0;
|
|
} else {
|
|
acc_mode = MAY_OPEN | ACC_MODE(flags);
|
|
}
|
|
|
|
op->open_flag = flags;
|
|
|
|
/* O_TRUNC implies we need access checks for write permissions */
|
|
if (flags & O_TRUNC)
|
|
acc_mode |= MAY_WRITE;
|
|
|
|
/* Allow the LSM permission hook to distinguish append
|
|
access from general write access. */
|
|
if (flags & O_APPEND)
|
|
acc_mode |= MAY_APPEND;
|
|
|
|
op->acc_mode = acc_mode;
|
|
|
|
op->intent = flags & O_PATH ? 0 : LOOKUP_OPEN;
|
|
|
|
if (flags & O_CREAT) {
|
|
op->intent |= LOOKUP_CREATE;
|
|
if (flags & O_EXCL)
|
|
op->intent |= LOOKUP_EXCL;
|
|
}
|
|
|
|
if (flags & O_DIRECTORY)
|
|
lookup_flags |= LOOKUP_DIRECTORY;
|
|
if (!(flags & O_NOFOLLOW))
|
|
lookup_flags |= LOOKUP_FOLLOW;
|
|
op->lookup_flags = lookup_flags;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* file_open_name - open file and return file pointer
|
|
*
|
|
* @name: struct filename containing path to open
|
|
* @flags: open flags as per the open(2) second argument
|
|
* @mode: mode for the new file if O_CREAT is set, else ignored
|
|
*
|
|
* This is the helper to open a file from kernelspace if you really
|
|
* have to. But in generally you should not do this, so please move
|
|
* along, nothing to see here..
|
|
*/
|
|
struct file *file_open_name(struct filename *name, int flags, umode_t mode)
|
|
{
|
|
struct open_flags op;
|
|
int err = build_open_flags(flags, mode, &op);
|
|
return err ? ERR_PTR(err) : do_filp_open(AT_FDCWD, name, &op);
|
|
}
|
|
|
|
/**
|
|
* filp_open - open file and return file pointer
|
|
*
|
|
* @filename: path to open
|
|
* @flags: open flags as per the open(2) second argument
|
|
* @mode: mode for the new file if O_CREAT is set, else ignored
|
|
*
|
|
* This is the helper to open a file from kernelspace if you really
|
|
* have to. But in generally you should not do this, so please move
|
|
* along, nothing to see here..
|
|
*/
|
|
struct file *filp_open(const char *filename, int flags, umode_t mode)
|
|
{
|
|
struct filename name = {.name = filename};
|
|
return file_open_name(&name, flags, mode);
|
|
}
|
|
EXPORT_SYMBOL(filp_open);
|
|
|
|
struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
|
|
const char *filename, int flags)
|
|
{
|
|
struct open_flags op;
|
|
int err = build_open_flags(flags, 0, &op);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
if (flags & O_CREAT)
|
|
return ERR_PTR(-EINVAL);
|
|
if (!filename && (flags & O_DIRECTORY))
|
|
if (!dentry->d_inode->i_op->lookup)
|
|
return ERR_PTR(-ENOTDIR);
|
|
return do_file_open_root(dentry, mnt, filename, &op);
|
|
}
|
|
EXPORT_SYMBOL(file_open_root);
|
|
|
|
long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)
|
|
{
|
|
struct open_flags op;
|
|
int fd = build_open_flags(flags, mode, &op);
|
|
struct filename *tmp;
|
|
|
|
if (fd)
|
|
return fd;
|
|
|
|
tmp = getname(filename);
|
|
if (IS_ERR(tmp))
|
|
return PTR_ERR(tmp);
|
|
|
|
fd = get_unused_fd_flags(flags);
|
|
if (fd >= 0) {
|
|
struct file *f = do_filp_open(dfd, tmp, &op);
|
|
if (IS_ERR(f)) {
|
|
put_unused_fd(fd);
|
|
fd = PTR_ERR(f);
|
|
} else {
|
|
fsnotify_open(f);
|
|
fd_install(fd, f);
|
|
}
|
|
}
|
|
putname(tmp);
|
|
return fd;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
|
|
{
|
|
if (force_o_largefile())
|
|
flags |= O_LARGEFILE;
|
|
|
|
return do_sys_open(AT_FDCWD, filename, flags, mode);
|
|
}
|
|
|
|
SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags,
|
|
umode_t, mode)
|
|
{
|
|
if (force_o_largefile())
|
|
flags |= O_LARGEFILE;
|
|
|
|
return do_sys_open(dfd, filename, flags, mode);
|
|
}
|
|
|
|
#ifndef __alpha__
|
|
|
|
/*
|
|
* For backward compatibility? Maybe this should be moved
|
|
* into arch/i386 instead?
|
|
*/
|
|
SYSCALL_DEFINE2(creat, const char __user *, pathname, umode_t, 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->flush)
|
|
retval = filp->f_op->flush(filp, id);
|
|
|
|
if (likely(!(filp->f_mode & FMODE_PATH))) {
|
|
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.
|
|
*/
|
|
SYSCALL_DEFINE1(close, unsigned int, fd)
|
|
{
|
|
int retval = __close_fd(current->files, fd);
|
|
|
|
/* can't restart close syscall because file table entry was cleared */
|
|
if (unlikely(retval == -ERESTARTSYS ||
|
|
retval == -ERESTARTNOINTR ||
|
|
retval == -ERESTARTNOHAND ||
|
|
retval == -ERESTART_RESTARTBLOCK))
|
|
retval = -EINTR;
|
|
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL(sys_close);
|
|
|
|
/*
|
|
* This routine simulates a hangup on the tty, to arrange that users
|
|
* are given clean terminals at login time.
|
|
*/
|
|
SYSCALL_DEFINE0(vhangup)
|
|
{
|
|
if (capable(CAP_SYS_TTY_CONFIG)) {
|
|
tty_vhangup_self();
|
|
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 -EOVERFLOW;
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(generic_file_open);
|
|
|
|
/*
|
|
* This is used by subsystems that don't want seekable
|
|
* file descriptors. The function is not supposed to ever fail, the only
|
|
* reason it returns an 'int' and not 'void' is so that it can be plugged
|
|
* directly into file_operations structure.
|
|
*/
|
|
int nonseekable_open(struct inode *inode, struct file *filp)
|
|
{
|
|
filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(nonseekable_open);
|