linux-kernel - Re: [PATCH bpf-next 2/2] selftests/bpf: Extend test fs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZxibdxIjfaHOpGJn@infradead.org>
Date: Tue, 22 Oct 2024 23:45:11 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Christian Brauner <brauner@...nel.org>
Cc: Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>,
	Song Liu <songliubraving@...a.com>, Song Liu <song@...nel.org>,
	bpf <bpf@...r.kernel.org>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Kernel Team <kernel-team@...a.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Eduard Zingerman <eddyz87@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Al Viro <viro@...iv.linux.org.uk>, KP Singh <kpsingh@...nel.org>,
	Matt Bobrowski <mattbobrowski@...gle.com>
Subject: Re: [PATCH bpf-next 2/2] selftests/bpf: Extend test fs_kfuncs to
 cover security.bpf xattr names

On Mon, Oct 21, 2024 at 03:24:30PM +0200, Christian Brauner wrote:
> On Thu, Oct 17, 2024 at 08:03:51AM -0700, Christoph Hellwig wrote:
> > On Wed, Oct 16, 2024 at 04:51:37PM +0200, Christian Brauner wrote:
> > > > 
> > > > I think that getting user.* xattrs from bpf hooks can still be useful for
> > > > introspection and other tasks so I'm not convinced we should revert that
> > > > functionality but maybe it is too easy to misuse? I'm not really decided.
> > > 
> > > Reading user.* xattr is fine. If an LSM decides to built a security
> > > model around it then imho that's their business and since that happens
> > > in out-of-tree LSM programs: shrug.
> > 
> > By that argument user.kfuncs is even more useless as just being able
> > to read all xattrs should be just as fine.
> 
> bpf shouldn't read security.* of another LSM or a host of other examples...

Sorry if I was unclear, but this was all about user.*.