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=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 597D9C433E9 for ; Mon, 18 Jan 2021 10:00:38 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id E590922B49 for ; Mon, 18 Jan 2021 10:00:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E590922B49 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 88F934B25E; Mon, 18 Jan 2021 05:00:37 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7G6BDukfvI5K; Mon, 18 Jan 2021 05:00:36 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id DAB014B29B; Mon, 18 Jan 2021 05:00:31 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 2D4724B1E2 for ; Mon, 18 Jan 2021 05:00:29 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PIFsj6w8drGV for ; Mon, 18 Jan 2021 05:00:27 -0500 (EST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 36A9A4B26D for ; Mon, 18 Jan 2021 05:00:27 -0500 (EST) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4AC2A22AB0; Mon, 18 Jan 2021 10:00:26 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1l1R6z-008RhD-RY; Mon, 18 Jan 2021 09:46:14 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org Subject: [PATCH v4 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure Date: Mon, 18 Jan 2021 09:45:30 +0000 Message-Id: <20210118094533.2874082-19-maz@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210118094533.2874082-1-maz@kernel.org> References: <20210118094533.2874082-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, dbrazdil@google.com, alexandru.elisei@arm.com, ardb@kernel.org, jingzhangos@google.com, pajay@qti.qualcomm.com, psodagud@codeaurora.org, sramana@codeaurora.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: Prasad Sodagudi , Srinivas Ramana , Catalin Marinas , Ajay Patil , kernel-team@android.com, Will Deacon , Ard Biesheuvel X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Given that the early cpufeature infrastructure has borrowed quite a lot of code from the kaslr implementation, let's reimplement the matching of the "nokaslr" option with it. Signed-off-by: Marc Zyngier --- arch/arm64/kernel/idreg-override.c | 17 ++++++++++++++ arch/arm64/kernel/kaslr.c | 37 +++--------------------------- 2 files changed, 20 insertions(+), 34 deletions(-) diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c index 1db54878b2c4..143fe7b8e3ce 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -33,8 +33,24 @@ static const struct reg_desc mmfr1 __initdata = { }, }; +extern u64 kaslr_feature_val; +extern u64 kaslr_feature_mask; + +static const struct reg_desc kaslr __initdata = { + .name = "kaslr", +#ifdef CONFIG_RANDOMIZE_BASE + .val = &kaslr_feature_val, + .mask = &kaslr_feature_mask, +#endif + .fields = { + { "disabled", 0 }, + {} + }, +}; + static const struct reg_desc * const regs[] __initdata = { &mmfr1, + &kaslr, }; static const struct { @@ -43,6 +59,7 @@ static const struct { } aliases[] __initdata = { { "kvm-arm.mode=nvhe", "id_aa64mmfr1.vh=0" }, { "kvm-arm.mode=protected", "id_aa64mmfr1.vh=0" }, + { "nokaslr", "kaslr.disabled=1" }, }; static int __init find_field(const char *cmdline, const struct reg_desc *reg, diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c index 5fc86e7d01a1..dcc4a5aadbe2 100644 --- a/arch/arm64/kernel/kaslr.c +++ b/arch/arm64/kernel/kaslr.c @@ -51,39 +51,8 @@ static __init u64 get_kaslr_seed(void *fdt) return ret; } -static __init bool cmdline_contains_nokaslr(const u8 *cmdline) -{ - const u8 *str; - - str = strstr(cmdline, "nokaslr"); - return str == cmdline || (str > cmdline && *(str - 1) == ' '); -} - -static __init bool is_kaslr_disabled_cmdline(void *fdt) -{ - if (!IS_ENABLED(CONFIG_CMDLINE_FORCE)) { - int node; - const u8 *prop; - - node = fdt_path_offset(fdt, "/chosen"); - if (node < 0) - goto out; - - prop = fdt_getprop(fdt, node, "bootargs", NULL); - if (!prop) - goto out; - - if (cmdline_contains_nokaslr(prop)) - return true; - - if (IS_ENABLED(CONFIG_CMDLINE_EXTEND)) - goto out; - - return false; - } -out: - return cmdline_contains_nokaslr(CONFIG_CMDLINE); -} +u64 kaslr_feature_val __initdata; +u64 kaslr_feature_mask __initdata; /* * This routine will be executed with the kernel mapped at its default virtual @@ -126,7 +95,7 @@ u64 __init kaslr_early_init(void) * Check if 'nokaslr' appears on the command line, and * return 0 if that is the case. */ - if (is_kaslr_disabled_cmdline(fdt)) { + if (kaslr_feature_val & kaslr_feature_mask & 0xf) { kaslr_status = KASLR_DISABLED_CMDLINE; return 0; } -- 2.29.2 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm