return 0;
}
-asmlinkage long sys_statfs(const char __user * path, struct statfs __user * buf)
+asmlinkage long sys_statfs(const char __user *pathname, struct statfs __user * buf)
{
- struct nameidata nd;
+ struct path path;
int error;
- error = user_path_walk(path, &nd);
+ error = user_path(pathname, &path);
if (!error) {
struct statfs tmp;
- error = vfs_statfs_native(nd.path.dentry, &tmp);
+ error = vfs_statfs_native(path.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
- path_put(&nd.path);
+ path_put(&path);
}
return error;
}
-asmlinkage long sys_statfs64(const char __user *path, size_t sz, struct statfs64 __user *buf)
+asmlinkage long sys_statfs64(const char __user *pathname, size_t sz, struct statfs64 __user *buf)
{
- struct nameidata nd;
+ struct path path;
long error;
if (sz != sizeof(*buf))
return -EINVAL;
- error = user_path_walk(path, &nd);
+ error = user_path(pathname, &path);
if (!error) {
struct statfs64 tmp;
- error = vfs_statfs64(nd.path.dentry, &tmp);
+ error = vfs_statfs64(path.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
- path_put(&nd.path);
+ path_put(&path);
}
return error;
}
return err;
}
-static long do_sys_truncate(const char __user * path, loff_t length)
+static long do_sys_truncate(const char __user *pathname, loff_t length)
{
- struct nameidata nd;
- struct inode * inode;
+ struct path path;
+ struct inode *inode;
int error;
error = -EINVAL;
if (length < 0) /* sorry, but loff_t says... */
goto out;
- error = user_path_walk(path, &nd);
+ error = user_path(pathname, &path);
if (error)
goto out;
- inode = nd.path.dentry->d_inode;
+ inode = path.dentry->d_inode;
/* For directories it's -EISDIR, for other non-regulars - -EINVAL */
error = -EISDIR;
if (!S_ISREG(inode->i_mode))
goto dput_and_out;
- error = mnt_want_write(nd.path.mnt);
+ error = mnt_want_write(path.mnt);
if (error)
goto dput_and_out;
goto put_write_and_out;
error = locks_verify_truncate(inode, NULL, length);
+ if (!error)
+ error = security_path_truncate(&path, length, 0);
if (!error) {
DQUOT_INIT(inode);
- error = do_truncate(nd.path.dentry, length, 0, NULL);
+ error = do_truncate(path.dentry, length, 0, NULL);
}
put_write_and_out:
put_write_access(inode);
mnt_drop_write_and_out:
- mnt_drop_write(nd.path.mnt);
+ mnt_drop_write(path.mnt);
dput_and_out:
- path_put(&nd.path);
+ path_put(&path);
out:
return error;
}
error = locks_verify_truncate(inode, file, length);
if (!error)
+ error = security_path_truncate(&file->f_path, length,
+ ATTR_MTIME|ATTR_CTIME);
+ if (!error)
error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
out_putf:
fput(file);
if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
goto out_fput;
- if (inode->i_op && inode->i_op->fallocate)
+ if (inode->i_op->fallocate)
ret = inode->i_op->fallocate(inode, mode, offset, len);
else
ret = -EOPNOTSUPP;
*/
asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
{
- struct nameidata nd;
+ const struct cred *old_cred;
+ struct cred *override_cred;
+ struct path path;
struct inode *inode;
- int old_fsuid, old_fsgid;
- kernel_cap_t uninitialized_var(old_cap); /* !SECURE_NO_SETUID_FIXUP */
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;
+ override_cred = prepare_creds();
+ if (!override_cred)
+ return -ENOMEM;
- current->fsuid = current->uid;
- current->fsgid = current->gid;
+ override_cred->fsuid = override_cred->uid;
+ override_cred->fsgid = override_cred->gid;
if (!issecure(SECURE_NO_SETUID_FIXUP)) {
- /*
- * Clear the capabilities if we switch to a non-root user
- */
-#ifndef CONFIG_SECURITY_FILE_CAPABILITIES
- /*
- * 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.
- */
-#endif /* ndef CONFIG_SECURITY_FILE_CAPABILITIES */
- if (current->uid)
- old_cap = cap_set_effective(__cap_empty_set);
+ /* Clear the capabilities if we switch to a non-root user */
+ if (override_cred->uid)
+ cap_clear(override_cred->cap_effective);
else
- old_cap = cap_set_effective(current->cap_permitted);
+ override_cred->cap_effective =
+ override_cred->cap_permitted;
}
- res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
+ old_cred = override_creds(override_cred);
+
+ res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
if (res)
goto out;
- inode = nd.path.dentry->d_inode;
+ inode = path.dentry->d_inode;
if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
/*
* with the "noexec" flag.
*/
res = -EACCES;
- if (nd.path.mnt->mnt_flags & MNT_NOEXEC)
+ if (path.mnt->mnt_flags & MNT_NOEXEC)
goto out_path_release;
}
* inherently racy and know that the fs may change
* state before we even see this result.
*/
- if (__mnt_is_readonly(nd.path.mnt))
+ if (__mnt_is_readonly(path.mnt))
res = -EROFS;
out_path_release:
- path_put(&nd.path);
+ path_put(&path);
out:
- current->fsuid = old_fsuid;
- current->fsgid = old_fsgid;
-
- if (!issecure(SECURE_NO_SETUID_FIXUP))
- cap_set_effective(old_cap);
-
+ revert_creds(old_cred);
+ put_cred(override_cred);
return res;
}
asmlinkage long sys_chdir(const char __user * filename)
{
- struct nameidata nd;
+ struct path path;
int error;
- error = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &nd);
+ error = user_path_dir(filename, &path);
if (error)
goto out;
- error = inode_permission(nd.path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
+ error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
if (error)
goto dput_and_out;
- set_fs_pwd(current->fs, &nd.path);
+ set_fs_pwd(current->fs, &path);
dput_and_out:
- path_put(&nd.path);
+ path_put(&path);
out:
return error;
}
asmlinkage long sys_chroot(const char __user * filename)
{
- struct nameidata nd;
+ struct path path;
int error;
- error = __user_walk(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
+ error = user_path_dir(filename, &path);
if (error)
goto out;
- error = inode_permission(nd.path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
+ error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
if (error)
goto dput_and_out;
if (!capable(CAP_SYS_CHROOT))
goto dput_and_out;
- set_fs_root(current->fs, &nd.path);
+ set_fs_root(current->fs, &path);
error = 0;
dput_and_out:
- path_put(&nd.path);
+ path_put(&path);
out:
return error;
}
asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
mode_t mode)
{
- struct nameidata nd;
- struct inode * inode;
+ struct path path;
+ struct inode *inode;
int error;
struct iattr newattrs;
- error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
+ error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
if (error)
goto out;
- inode = nd.path.dentry->d_inode;
+ inode = path.dentry->d_inode;
- error = mnt_want_write(nd.path.mnt);
+ error = mnt_want_write(path.mnt);
if (error)
goto dput_and_out;
mutex_lock(&inode->i_mutex);
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.path.dentry, &newattrs);
+ error = notify_change(path.dentry, &newattrs);
mutex_unlock(&inode->i_mutex);
- mnt_drop_write(nd.path.mnt);
+ mnt_drop_write(path.mnt);
dput_and_out:
- path_put(&nd.path);
+ path_put(&path);
out:
return error;
}
asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group)
{
- struct nameidata nd;
+ struct path path;
int error;
- error = user_path_walk(filename, &nd);
+ error = user_path(filename, &path);
if (error)
goto out;
- error = mnt_want_write(nd.path.mnt);
+ error = mnt_want_write(path.mnt);
if (error)
goto out_release;
- error = chown_common(nd.path.dentry, user, group);
- mnt_drop_write(nd.path.mnt);
+ error = chown_common(path.dentry, user, group);
+ mnt_drop_write(path.mnt);
out_release:
- path_put(&nd.path);
+ path_put(&path);
out:
return error;
}
asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
gid_t group, int flag)
{
- struct nameidata nd;
+ struct path path;
int error = -EINVAL;
int follow;
goto out;
follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
- error = __user_walk_fd(dfd, filename, follow, &nd);
+ error = user_path_at(dfd, filename, follow, &path);
if (error)
goto out;
- error = mnt_want_write(nd.path.mnt);
+ error = mnt_want_write(path.mnt);
if (error)
goto out_release;
- error = chown_common(nd.path.dentry, user, group);
- mnt_drop_write(nd.path.mnt);
+ error = chown_common(path.dentry, user, group);
+ mnt_drop_write(path.mnt);
out_release:
- path_put(&nd.path);
+ path_put(&path);
out:
return error;
}
asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group)
{
- struct nameidata nd;
+ struct path path;
int error;
- error = user_path_walk_link(filename, &nd);
+ error = user_lpath(filename, &path);
if (error)
goto out;
- error = mnt_want_write(nd.path.mnt);
+ error = mnt_want_write(path.mnt);
if (error)
goto out_release;
- error = chown_common(nd.path.dentry, user, group);
- mnt_drop_write(nd.path.mnt);
+ error = chown_common(path.dentry, user, group);
+ mnt_drop_write(path.mnt);
out_release:
- path_put(&nd.path);
+ path_put(&path);
out:
return error;
}
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
int flags, struct file *f,
- int (*open)(struct inode *, struct file *))
+ int (*open)(struct inode *, struct file *),
+ const struct cred *cred)
{
struct inode *inode;
int error;
f->f_flags = flags;
- f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK |
+ f->f_mode = (__force fmode_t)((flags+1) & O_ACCMODE) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
- error = security_dentry_open(f);
+ error = security_dentry_open(f, cred);
if (error)
goto cleanup_all;
struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
int (*open)(struct inode *, struct file *))
{
+ const struct cred *cred = current_cred();
+
if (IS_ERR(nd->intent.open.file))
goto out;
if (IS_ERR(dentry))
nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
nd->intent.open.flags - 1,
nd->intent.open.file,
- open);
+ open, cred);
out:
return nd->intent.open.file;
out_err:
*/
struct file *nameidata_to_filp(struct nameidata *nd, int flags)
{
+ const struct cred *cred = current_cred();
struct file *filp;
/* Pick up the filp from the open intent */
/* Has the filesystem initialised the file for us? */
if (filp->f_path.dentry == NULL)
filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
- NULL);
+ NULL, cred);
else
path_put(&nd->path);
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)
+struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
+ const struct cred *cred)
{
int error;
struct file *f;
return ERR_PTR(error);
}
- return __dentry_open(dentry, mnt, flags, f, NULL);
+ return __dentry_open(dentry, mnt, flags, f, NULL, cred);
}
EXPORT_SYMBOL(dentry_open);
-/*
- * Find an empty file descriptor entry, and mark it busy.
- */
-int get_unused_fd_flags(int flags)
-{
- 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_fds,
- 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);
- if (flags & O_CLOEXEC)
- FD_SET(fd, fdt->close_on_exec);
- else
- 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;
-}
-
-int get_unused_fd(void)
-{
- return get_unused_fd_flags(0);
-}
-
-EXPORT_SYMBOL(get_unused_fd);
-
static void __put_unused_fd(struct files_struct *files, unsigned int fd)
{
struct fdtable *fdt = files_fdtable(files);
asmlinkage long sys_vhangup(void)
{
if (capable(CAP_SYS_TTY_CONFIG)) {
- /* XXX: this needs locking */
- tty_vhangup(current->signal->tty);
+ tty_vhangup_self();
return 0;
}
return -EPERM;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff