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Konstantin Andreev 70c5be42f6 smack: fix bug: invalid label of unix socket file 
[ Upstream commit 78fc6a94be ]

According to [1], the label of a UNIX domain socket (UDS)
file (i.e., the filesystem object representing the socket)
is not supposed to participate in Smack security.

To achieve this, [1] labels UDS files with "*"
in smack_d_instantiate().

Before [2], smack_d_instantiate() was responsible
for initializing Smack security for all inodes,
except ones under /proc

[2] imposed the sole responsibility for initializing
inode security for newly created filesystem objects
on smack_inode_init_security().

However, smack_inode_init_security() lacks some logic
present in smack_d_instantiate().
In particular, it does not label UDS files with "*".

This patch adds the missing labeling of UDS files
with "*" to smack_inode_init_security().

Labeling UDS files with "*" in smack_d_instantiate()
still works for stale UDS files that already exist on
disk. Stale UDS files are useless, but I keep labeling
them for consistency and maybe to make easier for user
to delete them.

Compared to [1], this version introduces the following
improvements:

  * UDS file label is held inside inode only
    and not saved to xattrs.

  * relabeling UDS files (setxattr, removexattr, etc.)
    is blocked.

[1] 2010-11-24 Casey Schaufler
commit b4e0d5f079 ("Smack: UDS revision")

[2] 2023-11-16 roberto.sassu
Fixes: e63d86b8b7 ("smack: Initialize the in-memory inode in smack_inode_init_security()")
Link: https://lore.kernel.org/linux-security-module/20231116090125.187209-5-roberto.sassu@huaweicloud.com/

Signed-off-by: Konstantin Andreev <andreev@swemel.ru>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-12-18 14:02:25 +01:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.