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 09194260582; Thu, 19 Jun 2025 22:01:44 +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=1750370504; cv=none; b=oBoDjNpqBiSm/JuCTMb4qEuey2/CT6idfgKgV4MiGE3YcuzQHG8df5s6ZUnCeh5dQ6b8vJsQBF7q5HoswyT7s83D24RnCysPJgKLUSS1z2nilZm2uWT8BcpeM4iqIRjph+s0CUC/xT2qUVOy6QE54jOCfWv8Xj80ibk7CjMbh9A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750370504; c=relaxed/simple; bh=Tz/lGOw8O1n2Xxaax92kMOO1KRDUnAFIXp6vTgb5S2c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=fXN/AnrT4CFQJo1Mq0lBr1NAbkj9Erz7jGzhUxgKhAv+BVOD/KKKwSoSJ6g4y43V25n3xpt0YUlNSMicDt1wV0fXXGOEek7tq0CvkxDaD5LvcZUvZInnA9S21kpcjUEP6mocM7/kmTdZvdW6+iG7AAW1E2ftntandQNakS9ypYY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s0qohlEv; 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="s0qohlEv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E212BC4CEEA; Thu, 19 Jun 2025 22:01:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750370503; bh=Tz/lGOw8O1n2Xxaax92kMOO1KRDUnAFIXp6vTgb5S2c=; h=From:To:Cc:Subject:Date:From; b=s0qohlEvQE03XP5M5sRB4OyEsTQMF/EO/GZTSj8Lpu89jafgQhDRQ2U2XhYEZ4Jlv Qn9fcCle9/IsaWxtw5KSsoneX8oJJ7yRUYFimROJvB4rq35mjtxOsEuV29VROkwpmJ 1HxxnyAetf5syxwQ6ti5OXGdcKBdZlwz90qGZ6YgnibSjAlT7GJzKMDyF7BuSnBR/S 1XhcpvY6xmwQlGXNeLIlcTKb3+Senklu4mmAg8klMgG0+UjqR1BNKVTYIKLvLEu5Hi bTIjCmL+8/oJzeLPIyFIlXYEFUsvdndduqoUCuv3zU87UT4lnnnEqHTuJ5AvPPfrDe xDiJmZJRyXwwA== 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 v2 bpf-next 0/5] Introduce bpf_cgroup_read_xattr Date: Thu, 19 Jun 2025 15:01:09 -0700 Message-ID: <20250619220114.3956120-1-song@kernel.org> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: linux-fsdevel@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 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 (4): 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 bpf: Make bpf_cgroup_read_xattr available to cgroup and struct_ops progs fs/bpf_fs_kfuncs.c | 86 +++++++++- fs/kernfs/inode.c | 74 ++++---- kernel/bpf/verifier.c | 5 + .../selftests/bpf/prog_tests/cgroup_xattr.c | 145 ++++++++++++++++ .../selftests/bpf/progs/cgroup_read_xattr.c | 158 ++++++++++++++++++ .../selftests/bpf/progs/read_cgroupfs_xattr.c | 60 +++++++ 6 files changed, 489 insertions(+), 39 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