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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 44CA2C43461 for ; Wed, 2 Sep 2020 23:00:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 162F52078E for ; Wed, 2 Sep 2020 23:00:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="uFhC7/P6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727823AbgIBXAQ (ORCPT ); Wed, 2 Sep 2020 19:00:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726310AbgIBW7d (ORCPT ); Wed, 2 Sep 2020 18:59:33 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02783C061247 for ; Wed, 2 Sep 2020 15:59:33 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id k74so807231ybf.23 for ; Wed, 02 Sep 2020 15:59:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=CrNKe5KWPc/suSiYgVvR/F8geruMqmj8gEkhvmIMPd0=; b=uFhC7/P6YSnAp19NmO2k5bqkub+XxhvGI8hQmZ+5fKhgUaIL6IHePFHXeE7ZfuHybM fTsKG667BhYlOwLOESzJ8HIwN5xcmfbVZFE2TLQc6S7GpNRw9nTr4EeHtwMLlV7Aodj7 2esAJkpiZvmUAC9eMLomI34mHBs5eNXhzCLRtcvN6p6gXlQfe+uanYXXmBDge+lwYJwq CvYfhBBaL25F0bCvKVcLMQwykpUyNxKdlZqv6MIgCpDn4G/MYH0X/4vPQXTwk7j95SK+ Z5fSibdpgD+2BVpzlXu6Chm1DcoaxZxVEl6rU6ITeSRfT/3RM6bdoMQcLrgur4Sjwv3R +aLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=CrNKe5KWPc/suSiYgVvR/F8geruMqmj8gEkhvmIMPd0=; b=GOsvODVoftmCac3EK9P4xsPCRtNdgjIFVgwqnB19hPAnT6rTS7xCxhJ1W78cLRE4S1 bFjt5IuhBeMxouohObmpj+w+mjA8NLgC3g3ctqNtPEy9aJyfidq70EfIDvV141ssEdRT 0tSp81OExj3kO1iE4ugZ7gTKWxUflByqKSr4EoB6zrvHL7+JrinNJr+O/tSsL3bUqfVI +CM2ub/0uvMBoj0PdBBt5n1nbOThjDe315tWicBeInMMM1BlXW2avjT6qxZyR5mHRyxZ ibCNTu7jBofW0V675+N9fzMd5fj9X/sfUyyCEyXXPFH5QAhkiSTRuD1TQ5gRNr5cSvmV 4Vww== X-Gm-Message-State: AOAM533jHQuvqF/W0lxYcfXjvfQ2h6hVX4UviR2KdIdZUu8936sdtYRa zacOElWpxyTuX43ByHyqf2/8wbU/E68kxd3g5Rg= X-Google-Smtp-Source: ABdhPJxcCJ/xgRxo3r/C8lW9cOvmuBYdiXjA+J+gWrgKxUDW2FTFRg9wmj3DvnnFBKvfhcN3EY0WDqH9OWbysIZ3XMk= X-Received: from ndesaulniers1.mtv.corp.google.com ([2620:15c:211:202:f693:9fff:fef4:4d25]) (user=ndesaulniers job=sendgmr) by 2002:a25:b5cc:: with SMTP id d12mr51918ybg.190.1599087572185; Wed, 02 Sep 2020 15:59:32 -0700 (PDT) Date: Wed, 2 Sep 2020 15:59:10 -0700 In-Reply-To: <20200902225911.209899-1-ndesaulniers@google.com> Message-Id: <20200902225911.209899-7-ndesaulniers@google.com> Mime-Version: 1.0 References: <20200902225911.209899-1-ndesaulniers@google.com> X-Mailer: git-send-email 2.28.0.402.g5ffc5be6b7-goog Subject: [PATCH v3 6/7] kasan: Remove mentions of unsupported Clang versions From: Nick Desaulniers To: Andrew Morton Cc: Kees Cook , Miguel Ojeda , Nathan Chancellor , Sedat Dilek , Marco Elver , Andrey Konovalov , Masahiro Yamada , clang-built-linux@googlegroups.com, Daniel Borkmann , Alexei Starovoitov , Will Deacon , Vincenzo Frascino , linux-kernel@vger.kernel.org, Nick Desaulniers Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marco Elver Since the kernel now requires at least Clang 10.0.1, remove any mention of old Clang versions and simplify the documentation. Signed-off-by: Marco Elver Signed-off-by: Nick Desaulniers Reviewed-by: Andrey Konovalov Reviewed-by: Kees Cook Reviewed-by: Nathan Chancellor --- Documentation/dev-tools/kasan.rst | 4 ++-- lib/Kconfig.kasan | 9 ++++----- 2 files changed, 6 insertions(+), 7 deletions(-) diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index 38fd5681fade..4abc84b1798c 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -13,10 +13,10 @@ KASAN uses compile-time instrumentation to insert validity checks before every memory access, and therefore requires a compiler version that supports that. Generic KASAN is supported in both GCC and Clang. With GCC it requires version -8.3.0 or later. With Clang it requires version 7.0.0 or later, but detection of +8.3.0 or later. Any supported Clang version is compatible, but detection of out-of-bounds accesses for global variables is only supported since Clang 11. -Tag-based KASAN is only supported in Clang and requires version 7.0.0 or later. +Tag-based KASAN is only supported in Clang. Currently generic KASAN is supported for the x86_64, arm64, xtensa, s390 and riscv architectures, and tag-based KASAN is supported only for arm64. diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index 047b53dbfd58..033a5bc67ac4 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -54,9 +54,9 @@ config KASAN_GENERIC Enables generic KASAN mode. This mode is supported in both GCC and Clang. With GCC it requires - version 8.3.0 or later. With Clang it requires version 7.0.0 or - later, but detection of out-of-bounds accesses for global variables - is supported only since Clang 11. + version 8.3.0 or later. Any supported Clang version is compatible, + but detection of out-of-bounds accesses for global variables is + supported only since Clang 11. This mode consumes about 1/8th of available memory at kernel start and introduces an overhead of ~x1.5 for the rest of the allocations. @@ -78,8 +78,7 @@ config KASAN_SW_TAGS Enables software tag-based KASAN mode. This mode requires Top Byte Ignore support by the CPU and therefore - is only supported for arm64. This mode requires Clang version 7.0.0 - or later. + is only supported for arm64. This mode requires Clang. This mode consumes about 1/16th of available memory at kernel start and introduces an overhead of ~20% for the rest of the allocations. -- 2.28.0.402.g5ffc5be6b7-goog