linux-kernel - Re: [PATCH] vfs,shmem,kernfs: fix listxattr to include security.* xattrs

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Message-ID: <2025042427-hardship-captive-4d7b@gregkh>
Date: Thu, 24 Apr 2025 15:12:02 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Stephen Smalley <stephen.smalley.work@...il.com>
Cc: paul@...l-moore.com, omosnace@...hat.com,
	linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Hugh Dickins <hughd@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] vfs,shmem,kernfs: fix listxattr to include security.*
 xattrs

On Thu, Apr 24, 2025 at 08:46:43AM -0400, Stephen Smalley wrote:
> 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>
> 
> After:
> $ getfattr -m.* /run/initramfs
> security.selinux
> $ getfattr -m.* /sys/kernel/fscaps
> security.selinux
> 
> 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@...il.com>

As this "changed" in the past, shouldn't it have a "Fixes:" tag?

thanks,

greg k-h