From nobody Sun Feb 8 21:47:00 2026 Received: from out-187.mta1.migadu.com (out-187.mta1.migadu.com [95.215.58.187]) (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 2C2671A7253 for ; Mon, 28 Apr 2025 03:36:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745811402; cv=none; b=LosoG17mZmzU6gZdimkihihls6rM7kweuR8R0wMHLSWBEohUwdK0bCjkzD++PdvYJ52F9VfeBx7mWHPPDU5ioff66q8XQC10Q3EwbdtjDOPRoO7GS+5/AtC0f/bS2ALmn9XHlJUWDKa80ufT1fDM0zfbcfcb5yrOQ7BELH80cfg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745811402; c=relaxed/simple; bh=kJw6iLbzvnaJTqf9ImsAV2CPxj5CSyBuIfj13anM9xs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sBU5alhXGZNu3biTkIb0rqGGugOXm0bU9hA/8/B7JUH+k/FXEOSOUkrgLL+7qz4+ShIZ/Grq4Ei1w+wzl/dLL3MLTV4B7eM2r3WX/1oL91+XIszJ/DDH+BBLhxj+5fychuv5AUN6gJUgjRzwwuipriUKeoU+zyogUSoaNMg06S8= 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=dygpIniM; arc=none smtp.client-ip=95.215.58.187 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="dygpIniM" 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=1745811398; 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=dQGxdvGT6JUQEBkk90cx9D02VWeJqf+rh/ZdIhrKaXY=; b=dygpIniMefoq4jZCfd010aoExiKB9GnWfMLUmOO4XeAp2wa9ymmL7HiLJo0/JdjtYNsIss +dcL75/+JuBbYlv56lbx/GalFSwZGuY/9SY2yPHoXok1nJgtRmCFY3836KmJ1HRQg76nkO CgIlBVTGbZHsNtf3WEx0fJZw2Ayn4QY= From: Roman Gushchin To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Alexei Starovoitov , Johannes Weiner , Michal Hocko , Shakeel Butt , Suren Baghdasaryan , David Rientjes , Josh Don , Chuyi Zhou , cgroups@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, Roman Gushchin Subject: [PATCH rfc 02/12] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Date: Mon, 28 Apr 2025 03:36:07 +0000 Message-ID: <20250428033617.3797686-3-roman.gushchin@linux.dev> In-Reply-To: <20250428033617.3797686-1-roman.gushchin@linux.dev> References: <20250428033617.3797686-1-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 --- kernel/bpf/verifier.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 54c6953a8b84..d2d9f9b87065 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7047,6 +7047,10 @@ 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) @@ -7087,6 +7091,7 @@ static bool type_is_trusted_or_null(struct bpf_verifi= er_env *env, const char *field_name, u32 btf_id) { BTF_TYPE_EMIT(BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct socket)); + 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 2.49.0.901.g37484f566f-goog