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 8068628506B; Wed, 18 Jun 2025 23:38:06 +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=1750289886; cv=none; b=Hn8ZSmHT5UwWTbqEelzepwbtwdxfJFng9O4MfgHIwyiAG9BUn+JHcfy3P9UwzXZUQK8l08KdXg90UGBxKe3i/GEQtqvfr5RdIDn3DJi7pTgR5cbMqISas8rNbLKWkp1qvNeglM/EyE4uBRqclgxg3L4TJKYv48FevKtEZ0XbNUM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750289886; c=relaxed/simple; bh=BEJZRN76m+6IEQPpBHY905TwGMpPvyUC5d/zGM477GM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hBIw4DoArUQtRr2V50+2ptRd1inWNOiOQc6ubhP92X6eSsyDEmu4v4jc3b8ECC1O+Y1c+Wug3GDxNfGT2WVwGugttcAvp5+JIRn1awNGdv8whqXQkGw4KXNor1YcXTTbHmr8i060ToH8Vi7+qdqPR0cXBTjIi9xDPGkQwwFBtpg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ybjnhxgl; 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="Ybjnhxgl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 28F88C4CEE7; Wed, 18 Jun 2025 23:38:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750289886; bh=BEJZRN76m+6IEQPpBHY905TwGMpPvyUC5d/zGM477GM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ybjnhxgl6S4FzP8XrakM4Pq5QDHYuyAdLu/JGs8nDTFsHNTkE5DneuKuFow8jUFmH Ho9TZtHZwyLS1bajq8tO0UM3/3iZJ1X+j7jHJhD/pP0x/QX+444aoffZCwt7+2/An+ a0OFx7mMQe/P81gzLkg0m/pez7LxATcFP+/MAuJLDUQ3yPylVtZePFwP0/EdVu13e1 HmYNspkagu26CrWYB+BL0ZDycuOIEko8NyisNepGPSsEsCXDRyLZRLou1igdIOb3GF cj/MQR+R1IAdlHUNwohtIbQl9VZ8HWprxyQFf6gBChg1APZ7sEwBJ2tIwt++gdb3g5 TNc2dfmo/n1ZA== 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 bpf-next 3/4] bpf: Mark cgroup_subsys_state->cgroup RCU safe Date: Wed, 18 Jun 2025 16:37:38 -0700 Message-ID: <20250618233739.189106-4-song@kernel.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250618233739.189106-1-song@kernel.org> References: <20250618233739.189106-1-song@kernel.org> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Mark struct cgroup_subsys_state->cgroup as safe under RCU read lock. This will enable accessing css->cgroup from a bpf css iterator. Signed-off-by: Song Liu --- kernel/bpf/verifier.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 279a64933262..e2f53dc8766a 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7058,6 +7058,10 @@ BTF_TYPE_SAFE_RCU(struct css_set) { struct cgroup *dfl_cgrp; }; +BTF_TYPE_SAFE_RCU(struct cgroup_subsys_state) { + struct cgroup *cgroup; +}; + /* RCU trusted: these fields are trusted in RCU CS and can be NULL */ BTF_TYPE_SAFE_RCU_OR_NULL(struct mm_struct) { struct file __rcu *exe_file; @@ -7108,6 +7112,7 @@ static bool type_is_rcu(struct bpf_verifier_env *env, BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct task_struct)); BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct cgroup)); BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct css_set)); + BTF_TYPE_EMIT(BTF_TYPE_SAFE_RCU(struct cgroup_subsys_state)); return btf_nested_type_is_trusted(&env->log, reg, field_name, btf_id, "__safe_rcu"); } -- 2.47.1