From nobody Sat Oct 4 11:13:51 2025 Received: from out-176.mta1.migadu.com (out-176.mta1.migadu.com [95.215.58.176]) (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 58152345743 for ; Mon, 18 Aug 2025 17:01:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755536518; cv=none; b=qpW77ByTcyjxS1DsU52/Ur4sotl0iuTeDuci6YSiqWu9hLSbhisHlorZH0BA3kAXSzk9CGcBTbcUAKCBqdLL3DUUgCfiFA9l5xBXdFQ9aO36O6YSluNSWvmdRnDaYoSoJRcKPUDVY+k0r2LDBKmDXWnBVewhqac79X59ibSxHpo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755536518; c=relaxed/simple; bh=/dEZnLiGaz7HAgtMNSqJ6aIkswSJwGKaAbEHmWJ87j4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EJxuAA47I4wRpyj+h5ABBvsjNTeOR/6QxFHGbWPKjFMxYnx9MM/Dld2ZQUfspOS5/RpeYbPhO5faLgjv93KKDrbowgWOdmVPpYcN21k5m5FfYXcznq9kbZKK5dBbEQbSdEMfEPHyTbNIr/p0v2S7dbQojfBOSnFEkXxeVwwb01s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=stwTv26k; arc=none smtp.client-ip=95.215.58.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="stwTv26k" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1755536514; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=spKMQn7nIVpT0/mjP9As0UlCNDUJOgYkELPXiq5D32U=; b=stwTv26ksBnQzC/fOPKoIoZj8nFwNHuCsH2a3/p+NiLavlZyC/iWksVguM9b1cmfmHwuht 4qxDw5kejSx5NB86vwRw7QmLxeji0zoV/T7OPU/5t5WVbx/yXBGUQMmmory7rKcWcW7Hah GM6PJtse+KnlXgK7IcEtdM0FKn5dcm8= From: Roman Gushchin To: linux-mm@kvack.org, bpf@vger.kernel.org Cc: Suren Baghdasaryan , Johannes Weiner , Michal Hocko , David Rientjes , Matt Bobrowski , Song Liu , Kumar Kartikeya Dwivedi , Alexei Starovoitov , Andrew Morton , linux-kernel@vger.kernel.org, Roman Gushchin Subject: [PATCH v1 02/14] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Date: Mon, 18 Aug 2025 10:01:24 -0700 Message-ID: <20250818170136.209169-3-roman.gushchin@linux.dev> In-Reply-To: <20250818170136.209169-1-roman.gushchin@linux.dev> References: <20250818170136.209169-1-roman.gushchin@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Struct oom_control is used to describe the OOM context. It's memcg field defines the scope of OOM: it's NULL for global OOMs and a valid memcg pointer for memcg-scoped OOMs. Teach bpf verifier to recognize it as trusted or NULL pointer. It will provide the bpf OOM handler a trusted memcg pointer, which for example is required for iterating the memcg's subtree. Signed-off-by: Roman Gushchin Acked-by: Kumar Kartikeya Dwivedi --- kernel/bpf/verifier.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 169845710c7e..b5153c843028 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7035,6 +7035,10 @@ BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct socket) { struct sock *sk; }; =20 +BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct oom_control) { + struct mem_cgroup *memcg; +}; + static bool type_is_rcu(struct bpf_verifier_env *env, struct bpf_reg_state *reg, const char *field_name, u32 btf_id) @@ -7075,6 +7079,7 @@ static bool type_is_trusted_or_null(struct bpf_verifi= er_env *env, { BTF_TYPE_EMIT(BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct socket)); BTF_TYPE_EMIT(BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct dentry)); + BTF_TYPE_EMIT(BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct oom_control)); =20 return btf_nested_type_is_trusted(&env->log, reg, field_name, btf_id, "__safe_trusted_or_null"); --=20 2.50.1