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=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 7BEC1C54FCB for ; Mon, 27 Apr 2020 16:01:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 55DB8205C9 for ; Mon, 27 Apr 2020 16:01:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CRokN2oO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728635AbgD0QBF (ORCPT ); Mon, 27 Apr 2020 12:01:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1728616AbgD0QBA (ORCPT ); Mon, 27 Apr 2020 12:01:00 -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 8BFE0C0610D5 for ; Mon, 27 Apr 2020 09:01:00 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id t2so20785172ybq.11 for ; Mon, 27 Apr 2020 09:01:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=qkETA9PcFfLLgtHJjON9o2tnpUEMYOCdGfYROMcqbgY=; b=CRokN2oO5qHaIwDnfhPQm4WUGN3dL/7L085WmXGBSTSWdMgIglwt0wRRJelCXVTkUE evOGTcMnXuR7Gjk4FVLYN7tW5CCc6BokYtvDyoKf0BZkGqxaFodx3U9MT4v6NLYHqmZ3 iKYOMczKSYycS/Y78HO0iUKm+Cybr6RYQTwonAcmpQMj4NBDWRV7rBluW3RDsp+lkYsB XjiNReA/J9iMZUvAfy9f6Kp0qq+eqtAmtSd9c8FAhrtbFh6vgYjxE0lF9hnWHmvKb9K6 9WkijNUXXW4KO1tiyvrcZh1oyagjEj80iU2m3X3BlmfDkqRZqoPzeopP0mihx1UMFM7T 1fAQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=qkETA9PcFfLLgtHJjON9o2tnpUEMYOCdGfYROMcqbgY=; b=CSthLJ/DvUcnPHpGcJ+KXtIbGcE4+PAgdcK/qZ2g+kRQLt6p9JlJQpyOCnbnTwnv63 J0GfLsT6+AUcgcOFR80Xuy+kqdvjO18li9sMpa2iqeX9VXiZXaLYymNQEPy4rpTk4uhu mc/GSQFhKXDQEjDdbf74NAotHbdWAtfw3x44Ejkg26R/H3OVkqM/2clEJ81EvzOAgAKO yeRXmigWs4CtPNaKpBCdzt5wpbc/eh4PdvFzpITeUH7XCjf6dFmg5wB2T/WoNwT5OmP7 b3mKAhW20KTfNa3IHnupWRt/370nlpthlrv+evMrMHI5t+StS/2VXpKUmOdANpjCtJzP /h5w== X-Gm-Message-State: AGi0PubDdw1gYOzLhwtjnfJYL+v8h8jJ4kWIn/ZDGmsk2AeUn9LqFldT DrCZyExnLiPJx0GrMVyf/iV0ORiZbbYSlY3QZUw= X-Google-Smtp-Source: APiQypLYy8Cf6kn4jY7fWjXaYMyZ9zM7eZaWrEh0s8K72Jfk+q/yv/f8RANanjFwMmhFbjtpLFic2YH4QuKkPtwOEog= X-Received: by 2002:a25:d14c:: with SMTP id i73mr9231289ybg.116.1588003258779; Mon, 27 Apr 2020 09:00:58 -0700 (PDT) Date: Mon, 27 Apr 2020 09:00:17 -0700 In-Reply-To: <20200427160018.243569-1-samitolvanen@google.com> Message-Id: <20200427160018.243569-12-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20200427160018.243569-1-samitolvanen@google.com> X-Mailer: git-send-email 2.26.2.303.gf8c07b1a785-goog Subject: [PATCH v13 11/12] arm64: scs: add shadow stacks for SDEI From: Sami Tolvanen To: Will Deacon , Catalin Marinas , James Morse , Steven Rostedt , Ard Biesheuvel , Mark Rutland , Masahiro Yamada , Michal Marek , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot Cc: Dave Martin , Kees Cook , Laura Abbott , Marc Zyngier , Masami Hiramatsu , Nick Desaulniers , Jann Horn , Miguel Ojeda , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sami Tolvanen 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 This change adds per-CPU shadow call stacks for the SDEI handler. Similarly to how the kernel stacks are handled, we add separate shadow stacks for normal and critical events. Signed-off-by: Sami Tolvanen Reviewed-by: James Morse Tested-by: James Morse --- arch/arm64/kernel/entry.S | 14 +++++++++++++- arch/arm64/kernel/scs.c | 5 +++++ 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 244268d5ae47..cb0516e6f963 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -1049,13 +1049,16 @@ SYM_CODE_START(__sdei_asm_handler) mov x19, x1 +#if defined(CONFIG_VMAP_STACK) || defined(CONFIG_SHADOW_CALL_STACK) + ldrb w4, [x19, #SDEI_EVENT_PRIORITY] +#endif + #ifdef CONFIG_VMAP_STACK /* * entry.S may have been using sp as a scratch register, find whether * this is a normal or critical event and switch to the appropriate * stack for this CPU. */ - ldrb w4, [x19, #SDEI_EVENT_PRIORITY] cbnz w4, 1f ldr_this_cpu dst=x5, sym=sdei_stack_normal_ptr, tmp=x6 b 2f @@ -1065,6 +1068,15 @@ SYM_CODE_START(__sdei_asm_handler) mov sp, x5 #endif +#ifdef CONFIG_SHADOW_CALL_STACK + /* Use a separate shadow call stack for normal and critical events */ + cbnz w4, 3f + adr_this_cpu dst=x18, sym=sdei_shadow_call_stack_normal, tmp=x6 + b 4f +3: adr_this_cpu dst=x18, sym=sdei_shadow_call_stack_critical, tmp=x6 +4: +#endif + /* * We may have interrupted userspace, or a guest, or exit-from or * return-to either of these. We can't trust sp_el0, restore it. diff --git a/arch/arm64/kernel/scs.c b/arch/arm64/kernel/scs.c index acc6741d1a40..adc97f826fab 100644 --- a/arch/arm64/kernel/scs.c +++ b/arch/arm64/kernel/scs.c @@ -13,3 +13,8 @@ DEFINE_PER_CPU(unsigned long [SCS_SIZE/sizeof(long)], name) \ DEFINE_SCS(irq_shadow_call_stack); + +#ifdef CONFIG_ARM_SDE_INTERFACE +DEFINE_SCS(sdei_shadow_call_stack_normal); +DEFINE_SCS(sdei_shadow_call_stack_critical); +#endif -- 2.26.2.303.gf8c07b1a785-goog