From nobody Sat Feb 7 10:50:41 2026 Received: from out-174.mta0.migadu.com (out-174.mta0.migadu.com [91.218.175.174]) (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 483653033C5 for ; Tue, 27 Jan 2026 02:44:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769481889; cv=none; b=UcnpyRMaEAG76RylkoM4ksZF1RLIqXH6l7nT6ayHHBpX3RnE9DXDS1xkVuJuoO2GidF4HmhiO0Poa0LZW0cx412gVODEvHlUL0Y46s9Udd64Qwd+KV9W/5zNuI1SxvlqVn/CKgOCtUJ3gOLDMZsSyUV2TPGakNb8RoYeKDfz1ZY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769481889; c=relaxed/simple; bh=z0RVkCmdJdDDNrCdseww54S96faJsbAvjQEyWF1866s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rxLcwmOzpqXPHMEgkueOALpLsVmvsiMkwNbpSaW9Ki5Xpz030ZM35Wr6ELgEnl7wvsxBAYHpJjZoLqXF4y2xnU3trlMEhV1gQh5vd9pWQmqWUWwrgTaRa/oPvs5KY5JPo5W7jRt39wazcBVEBqXOBVLvaKpRgenzP7X/ku25DlU= 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=e7K+ACi9; arc=none smtp.client-ip=91.218.175.174 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="e7K+ACi9" 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=1769481885; 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=p7vIbktSHcqXA79Byy9E+tFFPUOD4j27CypvW5n/XGM=; b=e7K+ACi9n83DQDrLs2gEyZxviqSCTioKtYK/6R2Y1KGkxiJq+PltmgZRjD4uPP2dmip1bI 5902E3TbHB9SilvMJ5/obvDx/18kyu4hDGILzd0QyuPZgSHy2rJZ3wkN4vN0jsDOwK+s+p Y0PamNzRWNBsZqAdHYuRvLH9MSXAFkA= From: Roman Gushchin To: bpf@vger.kernel.org Cc: Michal Hocko , Alexei Starovoitov , Matt Bobrowski , Shakeel Butt , JP Kobryn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Suren Baghdasaryan , Johannes Weiner , Andrew Morton , Roman Gushchin , Kumar Kartikeya Dwivedi Subject: [PATCH bpf-next v3 05/17] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Date: Mon, 26 Jan 2026 18:44:08 -0800 Message-ID: <20260127024421.494929-6-roman.gushchin@linux.dev> In-Reply-To: <20260127024421.494929-1-roman.gushchin@linux.dev> References: <20260127024421.494929-1-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 Acked-by: Matt Bobrowski Acked-by: Yafang Shao --- kernel/bpf/verifier.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index c2f2650db9fd..cca36edb460d 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7242,6 +7242,10 @@ BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct vm_area_struct)= { struct file *vm_file; }; =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) @@ -7284,6 +7288,7 @@ 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 vm_area_struct)); + 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 2.52.0