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Stephen Smalley 10d1496f85 fs/xattr.c: fix simple_xattr_list to always include security.* xattrs 
[ Upstream commit 8b0ba61df5 ]

The vfs has long had a fallback to obtain the security.* xattrs from the
LSM when the filesystem does not implement its own listxattr, but
shmem/tmpfs and kernfs later gained their own xattr handlers to support
other xattrs. Unfortunately, as a side effect, tmpfs and kernfs-based
filesystems like sysfs no longer return the synthetic security.* xattr
names via listxattr unless they are explicitly set by userspace or
initially set upon inode creation after policy load. coreutils has
recently switched from unconditionally invoking getxattr for security.*
for ls -Z via libselinux to only doing so if listxattr returns the xattr
name, breaking ls -Z of such inodes.

Before:
$ getfattr -m.* /run/initramfs
<no output>
$ getfattr -m.* /sys/kernel/fscaps
<no output>
$ setfattr -n user.foo /run/initramfs
$ getfattr -m.* /run/initramfs
user.foo

After:
$ getfattr -m.* /run/initramfs
security.selinux
$ getfattr -m.* /sys/kernel/fscaps
security.selinux
$ setfattr -n user.foo /run/initramfs
$ getfattr -m.* /run/initramfs
security.selinux
user.foo

Link: https://lore.kernel.org/selinux/CAFqZXNtF8wDyQajPCdGn=iOawX4y77ph0EcfcqcUUj+T87FKyA@mail.gmail.com/
Link: https://lore.kernel.org/selinux/20250423175728.3185-2-stephen.smalley.work@gmail.com/
Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Link: https://lore.kernel.org/20250424152822.2719-1-stephen.smalley.work@gmail.com
Fixes: b09e0fa4b4 ("tmpfs: implement generic xattr support")
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-05-22 14:29:34 +02:00
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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.