From nobody Mon Feb 9 07:56:37 2026 Received: from out-171.mta0.migadu.com (out-171.mta0.migadu.com [91.218.175.171]) (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 C833326299; Wed, 4 Feb 2026 08:57:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770195467; cv=none; b=ptgmkHL6BN8S8hiu1QQtI1oQER37fC0HgIgfjlDWS+EbNZp8aFnIftkoOu7HYtzmK/Oq4QpmQ9wnDh8zQmL9Y1uA195BZco9C4NsZXbcoVW1cHFfxYgQPo0K5E6LKoAGFMvKgVxTk6BlJvOyYnlh1cn71KA3N9pYblG81626mmU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770195467; c=relaxed/simple; bh=N8uerXNrtYXAXsXSofx5ACpCyBePZpfRxoCGMF6fYG0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=o4TI1G4yLstJPtMdk5xlxvCeJlB/JYNlrb537AeIsa6ba49vuKSO3/efKLQhl3ZeWP+AYbxnSiVVGjtSBD5k6fDD3vkKdjTnOWEMvceVELjbs2j/eBrlXYdhrnERI2liiSEG/LrRlpJDKoESqNTcm+a9aZQd+4yIe5pX704M2bc= 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=RY1vW+qt; arc=none smtp.client-ip=91.218.175.171 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="RY1vW+qt" 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=1770195464; 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=R9sBuFUW725uaUgAoHBNUzbcXyyILwwKmBSUQhglIbE=; b=RY1vW+qtMDKwQl9rjfLkIOtyLgswYcVFWriYQGB5ViEB8shz43J9Ec08uBIyeeeiZyfnQZ E/0McPljtFAhv6dfAVv85rfIYU71RM+5tUag8YupjCOOz5QzN3oXtc4pl30wlaALRD4YFl JIp9lG9tLFZz9mEN0ps3XsU5fir3MBk= From: Hui Zhu To: Andrew Morton , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Peter Zijlstra , Miguel Ojeda , Nathan Chancellor , Kees Cook , Tejun Heo , Jeff Xu , mkoutny@suse.com, Jan Hendrik Farr , Christian Brauner , Randy Dunlap , Brian Gerst , Masahiro Yamada , davem@davemloft.net, Jakub Kicinski , Jesper Dangaard Brouer , JP Kobryn , Willem de Bruijn , Jason Xing , Paul Chaignon , Anton Protopopov , Amery Hung , Chen Ridong , Lance Yang , Jiayuan Chen , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Kumar Kartikeya Dwivedi Subject: [RFC PATCH bpf-next v6 03/12] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Date: Wed, 4 Feb 2026 16:56:24 +0800 Message-ID: In-Reply-To: References: 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" From: Roman Gushchin 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 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 2.43.0