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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1761607069; 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=fKYk3X446OvKPFK1dbaJLt6hxCv7gj7lfZhXfighlFU=; b=ku2hs8Yy7UvEemaXTfBXG4klDsCAebaAkVDabecACSyHzK1FlAZNchUjP2R9kWCRuWzeh3 T3K0YConVo0LzU3EJ2u5NQdqk331R4Y1lpBjCenBmLbDLwG6y+8Xctm/5qrxAe9u/FQ1Mw yNRExSxjfmVtfHkr2tIxuzgjMiNhz5I= From: Roman Gushchin To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Alexei Starovoitov , Suren Baghdasaryan , Michal Hocko , Shakeel Butt , Johannes Weiner , Andrii Nakryiko , JP Kobryn , linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Kumar Kartikeya Dwivedi , Tejun Heo , Roman Gushchin Subject: [PATCH v2 03/23] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Date: Mon, 27 Oct 2025 16:17:06 -0700 Message-ID: <20251027231727.472628-4-roman.gushchin@linux.dev> In-Reply-To: <20251027231727.472628-1-roman.gushchin@linux.dev> References: <20251027231727.472628-1-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Stat-Signature: w8t6qmqff3ut4tkwryfu8xp3gfstkaok X-Rspamd-Queue-Id: B92D140002 X-Rspamd-Server: rspam09 X-HE-Tag: 1761607070-886795 X-HE-Meta: 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 cIsylQHu 77uO+LAzeANqEJtXm0Zo3DdMTlOXFGElAcO7BJUQOBCw4y1B8kW9X+NSBVwX/blLCe9A39GyScQpZZqabR0UDeuczuIxRRPvOwRSAeIZ97MKLCGhlmjbwgs9STjFkkx4G17k6QN+BI+oFPxArtz8GrHJRHy36gQx3epPrdNY2XvkmQ7SdkCj5Hcqhe9ufBp55EdGuF0bho6iHguyJ+rHAwhaM0EYs/woEiZCBfsPkU3XRff4udC9fal589KN8DvqQD9Yp84oZ1roWsP4= 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: 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 542e23fb19c7..811275419be3 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -7104,6 +7104,10 @@ 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) @@ -7146,6 +7150,7 @@ 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"); -- 2.51.0