mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Jan Blunck](/assets/img/avatar_default.png)
* Add path_put() functions for releasing a reference to the dentry and vfsmount of a struct path in the right order * Switch from path_release(nd) to path_put(&nd->path) * Rename dput_path() to path_put_conditional() [akpm@linux-foundation.org: fix cifs] Signed-off-by: Jan Blunck <jblunck@suse.de> Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Acked-by: Christoph Hellwig <hch@lst.de> Cc: <linux-fsdevel@vger.kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Steven French <sfrench@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
201 lines
5.1 KiB
C
201 lines
5.1 KiB
C
#include <linux/compiler.h>
|
|
#include <linux/file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/utime.h>
|
|
#include <linux/syscalls.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/unistd.h>
|
|
|
|
#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)
|
|
{
|
|
struct timespec tv[2];
|
|
|
|
if (times) {
|
|
if (get_user(tv[0].tv_sec, ×->actime) ||
|
|
get_user(tv[1].tv_sec, ×->modtime))
|
|
return -EFAULT;
|
|
tv[0].tv_nsec = 0;
|
|
tv[1].tv_nsec = 0;
|
|
}
|
|
return do_utimes(AT_FDCWD, filename, times ? tv : NULL, 0);
|
|
}
|
|
|
|
#endif
|
|
|
|
static bool nsec_valid(long nsec)
|
|
{
|
|
if (nsec == UTIME_OMIT || nsec == UTIME_NOW)
|
|
return true;
|
|
|
|
return nsec >= 0 && nsec <= 999999999;
|
|
}
|
|
|
|
/* 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 timespec *times, int flags)
|
|
{
|
|
int error;
|
|
struct nameidata nd;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
struct iattr newattrs;
|
|
struct file *f = NULL;
|
|
|
|
error = -EINVAL;
|
|
if (times && (!nsec_valid(times[0].tv_nsec) ||
|
|
!nsec_valid(times[1].tv_nsec))) {
|
|
goto out;
|
|
}
|
|
|
|
if (flags & ~AT_SYMLINK_NOFOLLOW)
|
|
goto out;
|
|
|
|
if (filename == NULL && dfd != AT_FDCWD) {
|
|
error = -EINVAL;
|
|
if (flags & AT_SYMLINK_NOFOLLOW)
|
|
goto out;
|
|
|
|
error = -EBADF;
|
|
f = fget(dfd);
|
|
if (!f)
|
|
goto out;
|
|
dentry = f->f_path.dentry;
|
|
} else {
|
|
error = __user_walk_fd(dfd, filename, (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW, &nd);
|
|
if (error)
|
|
goto out;
|
|
|
|
dentry = nd.path.dentry;
|
|
}
|
|
|
|
inode = 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;
|
|
|
|
if (times[0].tv_nsec == UTIME_OMIT)
|
|
newattrs.ia_valid &= ~ATTR_ATIME;
|
|
else if (times[0].tv_nsec != UTIME_NOW) {
|
|
newattrs.ia_atime.tv_sec = times[0].tv_sec;
|
|
newattrs.ia_atime.tv_nsec = times[0].tv_nsec;
|
|
newattrs.ia_valid |= ATTR_ATIME_SET;
|
|
}
|
|
|
|
if (times[1].tv_nsec == UTIME_OMIT)
|
|
newattrs.ia_valid &= ~ATTR_MTIME;
|
|
else if (times[1].tv_nsec != UTIME_NOW) {
|
|
newattrs.ia_mtime.tv_sec = times[1].tv_sec;
|
|
newattrs.ia_mtime.tv_nsec = times[1].tv_nsec;
|
|
newattrs.ia_valid |= ATTR_MTIME_SET;
|
|
}
|
|
} else {
|
|
error = -EACCES;
|
|
if (IS_IMMUTABLE(inode))
|
|
goto dput_and_out;
|
|
|
|
if (!is_owner_or_cap(inode)) {
|
|
if (f) {
|
|
if (!(f->f_mode & FMODE_WRITE))
|
|
goto dput_and_out;
|
|
} else {
|
|
error = vfs_permission(&nd, MAY_WRITE);
|
|
if (error)
|
|
goto dput_and_out;
|
|
}
|
|
}
|
|
}
|
|
mutex_lock(&inode->i_mutex);
|
|
error = notify_change(dentry, &newattrs);
|
|
mutex_unlock(&inode->i_mutex);
|
|
dput_and_out:
|
|
if (f)
|
|
fput(f);
|
|
else
|
|
path_put(&nd.path);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
asmlinkage long sys_utimensat(int dfd, char __user *filename, struct timespec __user *utimes, int flags)
|
|
{
|
|
struct timespec tstimes[2];
|
|
|
|
if (utimes) {
|
|
if (copy_from_user(&tstimes, utimes, sizeof(tstimes)))
|
|
return -EFAULT;
|
|
if ((tstimes[0].tv_nsec == UTIME_OMIT ||
|
|
tstimes[0].tv_nsec == UTIME_NOW) &&
|
|
tstimes[0].tv_sec != 0)
|
|
return -EINVAL;
|
|
if ((tstimes[1].tv_nsec == UTIME_OMIT ||
|
|
tstimes[1].tv_nsec == UTIME_NOW) &&
|
|
tstimes[1].tv_sec != 0)
|
|
return -EINVAL;
|
|
|
|
/* Nothing to do, we must not even check the path. */
|
|
if (tstimes[0].tv_nsec == UTIME_OMIT &&
|
|
tstimes[1].tv_nsec == UTIME_OMIT)
|
|
return 0;
|
|
}
|
|
|
|
return do_utimes(dfd, filename, utimes ? tstimes : NULL, flags);
|
|
}
|
|
|
|
asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes)
|
|
{
|
|
struct timeval times[2];
|
|
struct timespec tstimes[2];
|
|
|
|
if (utimes) {
|
|
if (copy_from_user(×, utimes, sizeof(times)))
|
|
return -EFAULT;
|
|
|
|
/* This test is needed to catch all invalid values. If we
|
|
would test only in do_utimes we would miss those invalid
|
|
values truncated by the multiplication with 1000. Note
|
|
that we also catch UTIME_{NOW,OMIT} here which are only
|
|
valid for utimensat. */
|
|
if (times[0].tv_usec >= 1000000 || times[0].tv_usec < 0 ||
|
|
times[1].tv_usec >= 1000000 || times[1].tv_usec < 0)
|
|
return -EINVAL;
|
|
|
|
tstimes[0].tv_sec = times[0].tv_sec;
|
|
tstimes[0].tv_nsec = 1000 * times[0].tv_usec;
|
|
tstimes[1].tv_sec = times[1].tv_sec;
|
|
tstimes[1].tv_nsec = 1000 * times[1].tv_usec;
|
|
}
|
|
|
|
return do_utimes(dfd, filename, utimes ? tstimes : NULL, 0);
|
|
}
|
|
|
|
asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
|
|
{
|
|
return sys_futimesat(AT_FDCWD, filename, utimes);
|
|
}
|