From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4CDB5136348; Mon, 23 Jun 2025 06:39:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750660742; cv=none; b=pvZv7jeFkn/ZgKFVd/GpmF1Vbtb/U+TfbZOxPYhNA7wX11uUshFpCLGn03o6G6yo1GEylVaP6DP0YQkQyyyRIygknMnhkAGOjgB9uU1QFrF5ttD9+UgcwvQEOgeONgUxVbHOQ8xkPBsq7wxPHnuN2F4aGULexnYyWjZt6NhhGiQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750660742; c=relaxed/simple; bh=buYFvQ/djnOOvxUrhQfFa4W2KVshHCQ12FtFjG4Lbj4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=hW/Tm0ACggo0VORrXoGXXaEonsGvMVyeRdBoBO9hLUVKix0IzBsKTM/YFI3IqTLZ6aNaH6zqIa8PIhfSf4iAGRf4Y4GgCjN/k0p0JwWrAF6DpGRATpGLjYxGe3nQTdRdMAx1mTTRFnObBiybl8p/UN9memyQQjmipbbhFuOEQ8g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=swOqxQgO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="swOqxQgO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 138A1C4CEED; Mon, 23 Jun 2025 06:38:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750660741; bh=buYFvQ/djnOOvxUrhQfFa4W2KVshHCQ12FtFjG4Lbj4=; h=From:To:Cc:Subject:Date:From; b=swOqxQgOEpTqLYbskDwfDIWumX84AA9ctLsNxjzNKV6UM2EfnPUVUGg7EaJzX9NDX Py6wefAVt3li5vvfsfIqqRhFZS1JSdgtqLEawcVX+os0+8ZdUBNUq7M2pp85AbBdT5 RY6l64vXOnQT47SSsQiffbKOH63AdnQQ6cKw3hB5N51HRgtDsnhQpDOnvBkZxiLXaq KKAIohKkr5M/sFy+SYIcFZmTbSJK1lppAjz9qknDprHtqJlW519qwHk+x7qwg4GN+O 6tSW1SHZngEV48e3vp1Q6eJ1Poeser2v95mt7yCGTstOZfl+2obOlt28ShmrddUf5G Glg/+R3Ho/w3g== From: Song Liu To: bpf@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Cc: kernel-team@meta.com, andrii@kernel.org, eddyz87@gmail.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, kpsingh@kernel.org, mattbobrowski@google.com, amir73il@gmail.com, gregkh@linuxfoundation.org, tj@kernel.org, daan.j.demeyer@gmail.com, Song Liu Subject: [PATCH v3 bpf-next 0/4] Introduce bpf_cgroup_read_xattr Date: Sun, 22 Jun 2025 23:38:50 -0700 Message-ID: <20250623063854.1896364-1-song@kernel.org> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introduce a new kfunc bpf_cgroup_read_xattr, which can read xattr from cgroupfs nodes. The primary users are LSMs, cgroup programs, and sched_ext. --- Changes v2 => v3: 1. Make bpf_cgroup_read_xattr available to all program types. 2. Fix gcc build warning on the selftests. 3. Add "ifdef CONFIG_CGROUPS" around bpf_cgroup_read_xattr. v2: https://lore.kernel.org/bpf/20250619220114.3956120-1-song@kernel.org/ Changes v1 => v2: 1. Replace 1/4 in v1 with Chritian's version (1/5 in v2). 2. Rename bpf_kernfs_read_xattr => bpf_cgroup_read_xattr, and limit access to cgroup only. 3. Add 5/5, which makes bpf_cgroup_read_xattr available to cgroup and struct_ops programs. v1: https://lore.kernel.org/bpf/20250618233739.189106-1-song@kernel.org/ Christian Brauner (1): kernfs: remove iattr_mutex Song Liu (3): bpf: Introduce bpf_cgroup_read_xattr to read xattr of cgroup's node bpf: Mark cgroup_subsys_state->cgroup RCU safe selftests/bpf: Add tests for bpf_cgroup_read_xattr fs/bpf_fs_kfuncs.c | 34 ++++ fs/kernfs/inode.c | 74 ++++---- kernel/bpf/helpers.c | 3 + kernel/bpf/verifier.c | 5 + .../testing/selftests/bpf/bpf_experimental.h | 3 + .../selftests/bpf/prog_tests/cgroup_xattr.c | 145 ++++++++++++++++ .../selftests/bpf/progs/cgroup_read_xattr.c | 158 ++++++++++++++++++ .../selftests/bpf/progs/read_cgroupfs_xattr.c | 60 +++++++ 8 files changed, 448 insertions(+), 34 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/cgroup_xattr.c create mode 100644 tools/testing/selftests/bpf/progs/cgroup_read_xattr.c create mode 100644 tools/testing/selftests/bpf/progs/read_cgroupfs_xattr.c -- 2.47.1