From patchwork Tue Jan 12 09:14:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gilad Reti X-Patchwork-Id: 12012835 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB974C433E0 for ; Tue, 12 Jan 2021 09:15:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AB21522D58 for ; Tue, 12 Jan 2021 09:15:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389734AbhALJO5 (ORCPT ); Tue, 12 Jan 2021 04:14:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53814 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729821AbhALJO5 (ORCPT ); Tue, 12 Jan 2021 04:14:57 -0500 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6BCCC061794; Tue, 12 Jan 2021 01:14:16 -0800 (PST) Received: by mail-wr1-x433.google.com with SMTP id d26so1612780wrb.12; Tue, 12 Jan 2021 01:14:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=aLveLxeFrNvjHmoCR9A2oV0J+t8vyyrnKRnubdghhuU=; b=r2ZJ4ok+qcVmu0I2jzjZu0MSgognlZXsiDDUsoUpv+1D3BJAYs2T5/ZLUOcUkxWsgE eGOhsrXNXqcK2NNQObqqK3PuK/Gc9ptXmTSGsNkAC6LZ3hN65ldOXqBri/TAxN5xy3B/ h8/4GHSJu7p9xOEoZkyqaLKUaSrHkmIlOtkNAmaBLM39TOz6tfoyxbk6d9EZ8NmV0gCe y38QmY6dKD/wQvpI9nDJqRUJQcmFg9lQpSGaKUCRaYRchqHRzZX5RB84YQYpnixKDmuF HDr2uw9847Ky3yKFsKZlQUnXK2nUYJXSu3YKUQ/Mj5wJsNXlgnzFjOU1soU2/EpbuTNe L7VQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=aLveLxeFrNvjHmoCR9A2oV0J+t8vyyrnKRnubdghhuU=; b=lgaXN//BaqHvzMxNXUQOBU4rXZe5cRyTLc+1YX6vrOUsmaPqcjeSwMvBGjuYfPxOE1 ugdpfRoE19cMEOyjoK+GHgpLDiSLIDJEommmsdsswGLqITPhweWh9Vt47UXVKjVNnwvq H3aXCsMYy0iTjUt175N/vS7OueSNVPwStC0oyvyTykei4zqxzLkyIgMqqnKp3v+8CAYP s33YMxefCdzoxOcPDjV7Zqr4JFHV7Yy7ZKrIbE5NsIqlsWSfXEFbOpHpqC2+H5gyvSdq SlPFwRaARELs+A/eeDpBcdCbjhQUq9M78zijuWKWwqS7zVz3UiU+/zvDzSQu3ADKG+4A 61Og== X-Gm-Message-State: AOAM5332ZiOSLm2BOrI0Q0BShraZGE2MvOndwrTGMI6Up/QAnz/seJbT pSmrgZIpdmxcKkeWY+VWJsyF8bn0qcMlLpsu X-Google-Smtp-Source: ABdhPJzm0yhMovj3Ab546X1eJnZs7ddAADGvQziQllXXPgWOqTQca81g/eYkvRZfdq49xeTN3Xm6cw== X-Received: by 2002:a05:6000:18a3:: with SMTP id b3mr234261wri.373.1610442855164; Tue, 12 Jan 2021 01:14:15 -0800 (PST) Received: from ubuntu.localdomain (bzq-233-168-31-62.red.bezeqint.net. [31.168.233.62]) by smtp.googlemail.com with ESMTPSA id b10sm3085995wmj.5.2021.01.12.01.14.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Jan 2021 01:14:14 -0800 (PST) From: Gilad Reti To: bpf@vger.kernel.org Cc: gilad.reti@gmail.com, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf 1/2] bpf: support PTR_TO_MEM{,_OR_NULL} register spilling Date: Tue, 12 Jan 2021 11:14:03 +0200 Message-Id: <20210112091403.10458-1-gilad.reti@gmail.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Add support for pointer to mem register spilling, to allow the verifier to track pointer to valid memory addresses. Such pointers are returned for example by a successful call of the bpf_ringbuf_reserve helper. This patch was suggested as a solution by Yonghong Song. The patch was partially contibuted by CyberArk Software, Inc. Fixes: 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") Signed-off-by: Gilad Reti Acked-by: KP Singh --- kernel/bpf/verifier.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 17270b8404f1..36af69fac591 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2217,6 +2217,8 @@ static bool is_spillable_regtype(enum bpf_reg_type type) case PTR_TO_RDWR_BUF: case PTR_TO_RDWR_BUF_OR_NULL: case PTR_TO_PERCPU_BTF_ID: + case PTR_TO_MEM: + case PTR_TO_MEM_OR_NULL: return true; default: return false;