From: Christoph Hellwig <hch@infradead.org>
To: Song Liu <songliubraving@meta.com>
Cc: Christoph Hellwig <hch@infradead.org>, Song Liu <song@kernel.org>,
bpf <bpf@vger.kernel.org>,
Linux-Fsdevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Kernel Team <kernel-team@meta.com>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>,
Al Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
KP Singh <kpsingh@kernel.org>,
Matt Bobrowski <mattbobrowski@google.com>
Subject: Re: [PATCH bpf-next 2/2] selftests/bpf: Extend test fs_kfuncs to cover security.bpf xattr names
Date: Mon, 14 Oct 2024 22:25:53 -0700 [thread overview]
Message-ID: <Zw384bed3yVgZpoc@infradead.org> (raw)
In-Reply-To: <0DB83868-0049-40E3-8E62-0D8D913CB9CB@fb.com>
On Tue, Oct 15, 2024 at 05:21:48AM +0000, Song Liu wrote:
> >> Extend test_progs fs_kfuncs to cover different xattr names. Specifically:
> >> xattr name "user.kfuncs", "security.bpf", and "security.bpf.xxx" can be
> >> read from BPF program with kfuncs bpf_get_[file|dentry]_xattr(); while
> >> "security.bpfxxx" and "security.selinux" cannot be read.
> >
> > So you read code from untrusted user.* xattrs? How can you carve out
> > that space and not known any pre-existing userspace cod uses kfuncs
> > for it's own purpose?
>
> I don't quite follow the comment here.
>
> Do you mean user.* xattrs are untrusted (any user can set it), so we
> should not allow BPF programs to read them? Or do you mean xattr
> name "user.kfuncs" might be taken by some use space?
All of the above.
next prev parent reply other threads:[~2024-10-15 5:25 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-02 21:46 [PATCH bpf-next 0/2] security.bpf xattr name prefix Song Liu
2024-10-02 21:46 ` [PATCH bpf-next 1/2] fs/xattr: bpf: Introduce " Song Liu
2024-10-07 8:39 ` Jiri Olsa
2024-10-07 17:15 ` Song Liu
2024-10-14 10:18 ` Christian Brauner
2024-10-02 21:46 ` [PATCH bpf-next 2/2] selftests/bpf: Extend test fs_kfuncs to cover security.bpf xattr names Song Liu
2024-10-15 5:07 ` Christoph Hellwig
2024-10-15 5:21 ` Song Liu
2024-10-15 5:25 ` Christoph Hellwig [this message]
2024-10-15 5:52 ` Song Liu
2024-10-15 6:42 ` Christoph Hellwig
2024-10-15 13:54 ` Song Liu
2024-10-16 7:49 ` Christoph Hellwig
2024-10-16 13:51 ` Jan Kara
2024-10-16 14:51 ` Christian Brauner
2024-10-16 16:38 ` Song Liu
2024-10-17 15:03 ` Christoph Hellwig
2024-10-21 13:24 ` Christian Brauner
2024-10-23 6:45 ` Christoph Hellwig
2024-10-30 20:44 ` Song Liu
2024-10-31 6:56 ` Christoph Hellwig
2024-10-31 15:56 ` Song Liu
2024-10-31 16:10 ` Alexei Starovoitov
2024-10-11 17:40 ` [PATCH bpf-next 0/2] security.bpf xattr name prefix Song Liu
2024-10-14 10:18 ` Christian Brauner
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