From: Aleksa Sarai Date: Wed, 10 Jun 2020 05:53:19 +0000 (+1000) Subject: symlink.7: Document magic links more completely X-Git-Tag: man-pages-5.08~136 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41e240557f8ba75cb77591e83cd4a1026b9617e0;p=thirdparty%2Fman-pages.git symlink.7: Document magic links more completely Traditionally, magic links have not been a well-understood topic in Linux. This helps clarify some of the terminology used in openat2.2. Signed-off-by: Aleksa Sarai Signed-off-by: Michael Kerrisk --- diff --git a/man7/symlink.7 b/man7/symlink.7 index 07b1db3a37..ed99bc4236 100644 --- a/man7/symlink.7 +++ b/man7/symlink.7 @@ -84,6 +84,21 @@ 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. +.SS Magic-links +There is a special class of symlink-like objects known as "magic-links" which +can be found in certain pseudo-filesystems such as +.BR proc (5) +(examples include +.IR /proc/[pid]/exe " and " /proc/[pid]/fd/* .) +Unlike normal symlinks, 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.) +.PP +Because they can bypass ordinary +.BR mount_namespaces (7)-based +restrictions, magic-links have been used as attack vectors in various exploits. .SS Symbolic link ownership, permissions, and timestamps The owner and group of an existing symbolic link can be changed using @@ -99,16 +114,14 @@ of a symbolic link can be changed using or .BR lutimes (3). .PP -On Linux, the permissions of a symbolic link are not used -in any operations; the permissions are always -0777 (read, write, and execute for all user categories), .\" Linux does not currently implement an lchmod(2). -and can't be changed. -(Note that there are some "magic" symbolic links in the -.I /proc -directory tree\(emfor example, the -.IR /proc/[pid]/fd/* -files\(emthat have different permissions.) +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. +.PP +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. + .\" .\" The .\" 4.4BSD