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NAME
symlink - symbolic link handling
DESCRIPTION
Symbolic links are files that act as pointers to other files. To understand their behavior, you must
first understand how hard links work.
A hard link to a file is indistinguishable from the original file because it is a reference to the object
underlying the original filename. (To be precise: each of the hard links to a file is a reference to the
same inode number, where an inode number is an index into the inode table, which contains metadata about
all files on a filesystem. See stat(2).) Changes to a file are independent of the name used to
reference the file. Hard links may not refer to directories (to prevent the possibility of loops within
the filesystem tree, which would confuse many programs) and may not refer to files on different
filesystems (because inode numbers are not unique across filesystems).
A symbolic link is a special type of file whose contents are a string that is the pathname of another
file, the file to which the link refers. (The contents of a symbolic link can be read using
readlink(2).) In other words, a symbolic link is a pointer to another name, and not to an underlying
object. For this reason, symbolic links may refer to directories and may cross filesystem boundaries.
There is no requirement that the pathname referred to by a symbolic link should exist. A symbolic link
that refers to a pathname that does not exist is said to be a dangling link.
Because a symbolic link and its referenced object coexist in the filesystem name space, confusion can
arise in distinguishing between the link itself and the referenced object. On historical systems,
commands and system calls adopted their own link-following conventions in a somewhat ad-hoc fashion.
Rules for a more uniform approach, as they are implemented on Linux and other systems, are outlined here.
It is important that site-local applications also conform to these rules, so that the user interface can
be as consistent as possible.
Magic links
There is a special class of symbolic-link-like objects known as "magic links", which can be found in
certain pseudofilesystems such as proc(5) (examples include /proc/[pid]/exe and /proc/[pid]/fd/*).
Unlike normal symbolic links, magic links are not resolved through pathname-expansion, but instead act as
direct references to the kernel's own representation of a file handle. As such, these magic links allow
users to access files which cannot be referenced with normal paths (such as unlinked files still
referenced by a running program ).
Because they can bypass ordinary mount_namespaces(7)-based restrictions, magic links have been used as
attack vectors in various exploits.
Symbolic link ownership, permissions, and timestamps
The owner and group of an existing symbolic link can be changed using lchown(2). The only time that the
ownership of a symbolic link matters is when the link is being removed or renamed in a directory that has
the sticky bit set (see stat(2)).
The last access and last modification timestamps of a symbolic link can be changed using utimensat(2) or
lutimes(3).
On Linux, the permissions of an ordinary symbolic link are not used in any operations; the permissions
are always 0777 (read, write, and execute for all user categories), and can't be changed.
However, magic links do not follow this rule. They can have a non-0777 mode, though this mode is not
currently used in any permission checks.
Obtaining a file descriptor that refers to a symbolic link
Using the combination of the O_PATH and O_NOFOLLOW flags to open(2) yields a file descriptor that can be
passed as the dirfd argument in system calls such as fstatat(2), fchownat(2), fchmodat(2), linkat(2), and
readlinkat(2), in order to operate on the symbolic link itself (rather than the file to which it refers).
By default (i.e., if the AT_SYMLINK_FOLLOW flag is not specified), if name_to_handle_at(2) is applied to
a symbolic link, it yields a handle for the symbolic link (rather than the file to which it refers). One
can then obtain a file descriptor for the symbolic link (rather than the file to which it refers) by
specifying the O_PATH flag in a subsequent call to open_by_handle_at(2). Again, that file descriptor can
be used in the aforementioned system calls to operate on the symbolic link itself.
Handling of symbolic links by system calls and commands
Symbolic links are handled either by operating on the link itself, or by operating on the object referred
to by the link. In the latter case, an application or system call is said to follow the link. Symbolic
links may refer to other symbolic links, in which case the links are dereferenced until an object that is
not a symbolic link is found, a symbolic link that refers to a file which does not exist is found, or a
loop is detected. (Loop detection is done by placing an upper limit on the number of links that may be
followed, and an error results if this limit is exceeded.)
There are three separate areas that need to be discussed. They are as follows:
1. Symbolic links used as filename arguments for system calls.
2. Symbolic links specified as command-line arguments to utilities that are not traversing a file tree.
3. Symbolic links encountered by utilities that are traversing a file tree (either specified on the
command line or encountered as part of the file hierarchy walk).
Before describing the treatment of symbolic links by system calls and commands, we require some
terminology. Given a pathname of the form a/b/c, the part preceding the final slash (i.e., a/b) is
called the dirname component, and the part following the final slash (i.e., c) is called the basename
component.
Treatment of symbolic links in system calls
The first area is symbolic links used as filename arguments for system calls.
The treatment of symbolic links within a pathname passed to a system call is as follows:
1. Within the dirname component of a pathname, symbolic links are always followed in nearly every system
call. (This is also true for commands.) The one exception is openat2(2), which provides flags that
can be used to explicitly prevent following of symbolic links in the dirname component.
2. Except as noted below, all system calls follow symbolic links in the basename component of a pathname.
For example, if there were a symbolic link slink which pointed to a file named afile, the system call
open("slink" ...) would return a file descriptor referring to the file afile.
Various system calls do not follow links in the basename component of a pathname, and operate on the
symbolic link itself. They are: lchown(2), lgetxattr(2), llistxattr(2), lremovexattr(2), lsetxattr(2),
lstat(2), readlink(2), rename(2), rmdir(2), and unlink(2).
Certain other system calls optionally follow symbolic links in the basename component of a pathname.
They are: faccessat(2), fchownat(2), fstatat(2), linkat(2), name_to_handle_at(2), open(2), openat(2),
open_by_handle_at(2), and utimensat(2); see their manual pages for details. Because remove(3) is an
alias for unlink(2), that library function also does not follow symbolic links. When rmdir(2) is applied
to a symbolic link, it fails with the error ENOTDIR.
link(2) warrants special discussion. POSIX.1-2001 specifies that link(2) should dereference oldpath if
it is a symbolic link. However, Linux does not do this. (By default, Solaris is the same, but the
POSIX.1-2001 specified behavior can be obtained with suitable compiler options.) POSIX.1-2008 changed
the specification to allow either behavior in an implementation.
Commands not traversing a file tree
The second area is symbolic links, specified as command-line filename arguments, to commands which are
not traversing a file tree.
Except as noted below, commands follow symbolic links named as command-line arguments. For example, if
there were a symbolic link slink which pointed to a file named afile, the command cat slink would display
the contents of the file afile.
It is important to realize that this rule includes commands which may optionally traverse file trees; for
example, the command chown file is included in this rule, while the command chown -R file, which performs
a tree traversal, is not. (The latter is described in the third area, below.)
If it is explicitly intended that the command operate on the symbolic link instead of following the
symbolic link—for example, it is desired that chown slink change the ownership of the file that slink is,
whether it is a symbolic link or not—then the -h option should be used. In the above example, chown root
slink would change the ownership of the file referred to by slink, while chown -h root slink would change
the ownership of slink itself.
There are some exceptions to this rule:
* The mv(1) and rm(1) commands do not follow symbolic links named as arguments, but respectively attempt
to rename and delete them. (Note, if the symbolic link references a file via a relative path, moving
it to another directory may very well cause it to stop working, since the path may no longer be
correct.)
* The ls(1) command is also an exception to this rule. For compatibility with historic systems (when
ls(1) is not doing a tree walk—that is, -R option is not specified), the ls(1) command follows symbolic
links named as arguments if the -H or -L option is specified, or if the -F, -d, or -l options are not
specified. (The ls(1) command is the only command where the -H and -L options affect its behavior even
though it is not doing a walk of a file tree.)
* The file(1) command is also an exception to this rule. The file(1) command does not follow symbolic
links named as argument by default. The file(1) command does follow symbolic links named as argument
if the -L option is specified.
Commands traversing a file tree
The following commands either optionally or always traverse file trees: chgrp(1), chmod(1), chown(1),
cp(1), du(1), find(1), ls(1), pax(1), rm(1), and tar(1).
It is important to realize that the following rules apply equally to symbolic links encountered during
the file tree traversal and symbolic links listed as command-line arguments.
The first rule applies to symbolic links that reference files other than directories. Operations that
apply to symbolic links are performed on the links themselves, but otherwise the links are ignored.
The command rm -r slink directory will remove slink, as well as any symbolic links encountered in the
tree traversal of directory, because symbolic links may be removed. In no case will rm(1) affect the
file referred to by slink.
The second rule applies to symbolic links that refer to directories. Symbolic links that refer to
directories are never followed by default. This is often referred to as a "physical" walk, as opposed to
a "logical" walk (where symbolic links that refer to directories are followed).
Certain conventions are (should be) followed as consistently as possible by commands that perform file
tree walks:
* A command can be made to follow any symbolic links named on the command line, regardless of the type of
file they reference, by specifying the -H (for "half-logical") flag. This flag is intended to make the
command-line name space look like the logical name space. (Note, for commands that do not always do
file tree traversals, the -H flag will be ignored if the -R flag is not also specified.)
For example, the command chown -HR user slink will traverse the file hierarchy rooted in the file
pointed to by slink. Note, the -H is not the same as the previously discussed -h flag. The -H flag
causes symbolic links specified on the command line to be dereferenced for the purposes of both the
action to be performed and the tree walk, and it is as if the user had specified the name of the file
to which the symbolic link pointed.
* A command can be made to follow any symbolic links named on the command line, as well as any symbolic
links encountered during the traversal, regardless of the type of file they reference, by specifying
the -L (for "logical") flag. This flag is intended to make the entire name space look like the logical
name space. (Note, for commands that do not always do file tree traversals, the -L flag will be
ignored if the -R flag is not also specified.)
For example, the command chown -LR user slink will change the owner of the file referred to by slink.
If slink refers to a directory, chown will traverse the file hierarchy rooted in the directory that it
references. In addition, if any symbolic links are encountered in any file tree that chown traverses,
they will be treated in the same fashion as slink.
* A command can be made to provide the default behavior by specifying the -P (for "physical") flag. This
flag is intended to make the entire name space look like the physical name space.
For commands that do not by default do file tree traversals, the -H, -L, and -P flags are ignored if the
-R flag is not also specified. In addition, you may specify the -H, -L, and -P options more than once;
the last one specified determines the command's behavior. This is intended to permit you to alias
commands to behave one way or the other, and then override that behavior on the command line.
The ls(1) and rm(1) commands have exceptions to these rules:
* The rm(1) command operates on the symbolic link, and not the file it references, and therefore never
follows a symbolic link. The rm(1) command does not support the -H, -L, or -P options.
* To maintain compatibility with historic systems, the ls(1) command acts a little differently. If you
do not specify the -F, -d or -l options, ls(1) will follow symbolic links specified on the command
line. If the -L flag is specified, ls(1) follows all symbolic links, regardless of their type, whether
specified on the command line or encountered in the tree walk.
SEE ALSO
chgrp(1), chmod(1), find(1), ln(1), ls(1), mv(1), namei(1), rm(1), lchown(2), link(2), lstat(2),
readlink(2), rename(2), symlink(2), unlink(2), utimensat(2), lutimes(3), path_resolution(7)
COLOPHON
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