From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3EED5D72355 for ; Fri, 23 Jan 2026 08:56:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 66E1A6B046A; Fri, 23 Jan 2026 03:56:45 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 240AF6B046C; Fri, 23 Jan 2026 03:56:45 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0433A6B046D; Fri, 23 Jan 2026 03:56:44 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id E615A6B046A for ; Fri, 23 Jan 2026 03:56:44 -0500 (EST) Received: from smtpin24.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id A588816040C for ; Fri, 23 Jan 2026 08:56:44 +0000 (UTC) X-FDA: 84362623128.24.7F04A0F Received: from out-172.mta0.migadu.com (out-172.mta0.migadu.com [91.218.175.172]) by imf01.hostedemail.com (Postfix) with ESMTP id E643540003 for ; Fri, 23 Jan 2026 08:56:42 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="G/KkPluM"; spf=pass (imf01.hostedemail.com: domain of hui.zhu@linux.dev designates 91.218.175.172 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1769158603; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ev1nwp2jqQHVpe3TXk2x9AVEGB6Nj6mx2yP0IpcUZW4=; b=uhf+X+o4RdMKkWZtx2LxCULCC/Dack6Xi5keLzivg9wkz9hT0mM0Ujw1ljSOx7wnnA7u7n 2cnK4ca7jwSoNj2bSR8IHw/B7oLUvWg4Dz0DuU8xwX9mdKXsI2wEMxWZGCk1cJMhV0dMM4 yboWQk6NsOT6h2mHZ2a8jznbzbkp9bc= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b="G/KkPluM"; spf=pass (imf01.hostedemail.com: domain of hui.zhu@linux.dev designates 91.218.175.172 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769158603; a=rsa-sha256; cv=none; b=YpYugJvbEeFkrJix+2Q0ODnGOR1fFgVQfwV1WnfhKO4AUEnVKAQ166ye8ERikN1LFCI8yU I/GaAxYfd6x5bNPJMktaR9pD2+D97oufNGz/9sEis4HrdqhGAiPn90rCy0mOIREGGicYL3 k18qDYO6d6c74g5tRRKs8q1n4N4CQKs= 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=1769158600; 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=ev1nwp2jqQHVpe3TXk2x9AVEGB6Nj6mx2yP0IpcUZW4=; b=G/KkPluM8KiVv/KlXXvon+NjDg2D+OVXWkHzALnwohFtZK4prPRR6w8tcl7XhnGO9L1O5L yoLCuV9BE9e/bPYYrRXc1CFx1c+BQkJAnwkDsEou9XN8/GXO2/DN8T+qUPqi4V4YqtegaR vdecvuwC7H3OEHkwZGZukpN6hW5pqn8= 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 v3 03/12] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Date: Fri, 23 Jan 2026 16:55:21 +0800 Message-ID: <27af33f679846a2783cc8d82111ebeac170b004c.1769157382.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Stat-Signature: dtqx1fu65ybyzjs8537idfuobitax3h8 X-Rspamd-Queue-Id: E643540003 X-Rspam-User: X-HE-Tag: 1769158602-359222 X-HE-Meta: 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 pXfFGBPg T9T29bbxaIZVtft9rhP0QKJivNjqKOGyHaCNpyrH0UodnlkIZa6x8zDZXhEGoGhN1sq8F8YSZV32wqSOF6TKKcIs+bVRE/OHGmhLqowFZ8ulW3C1jb7TTngjKvap/iIrNu7qOyV+vxpo/RaU/xNCIjDBU+gaNxkdzn9litc5IpqhX/SOGq0rI5X4YuW42SDKEBe93Cp7rHYnl5yp+DvLXVVwdDYdwOOanA6nRNbYRPEvbyEO+6zyzxkrcU2zuRQcMAC3nlXU77AL8Dhd862jf8A7F+r/9NcPVRXZNIw6Yrq52Nt8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 7a375f608263..e59acdbb5062 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7152,6 +7152,10 @@ BTF_TYPE_SAFE_TRUSTED_OR_NULL(struct vm_area_struct) { struct file *vm_file; }; +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) @@ -7194,6 +7198,7 @@ static bool type_is_trusted_or_null(struct bpf_verifier_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)); return btf_nested_type_is_trusted(&env->log, reg, field_name, btf_id, "__safe_trusted_or_null"); -- 2.43.0