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,URIBL_BLOCKED, 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 BCBA7CA9ECF for ; Fri, 1 Nov 2019 22:12:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8B114218AC for ; Fri, 1 Nov 2019 22:12:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="LtAl7Dty" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728029AbfKAWMd (ORCPT ); Fri, 1 Nov 2019 18:12:33 -0400 Received: from mail-vs1-f74.google.com ([209.85.217.74]:43382 "EHLO mail-vs1-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727499AbfKAWMc (ORCPT ); Fri, 1 Nov 2019 18:12:32 -0400 Received: by mail-vs1-f74.google.com with SMTP id x2so1933928vse.10 for ; Fri, 01 Nov 2019 15:12:30 -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=oPoEfiJ829HFiTJF4c1zGL5TdlrTqAGNgCQhkPxdZv8=; b=LtAl7DtyP3CWOemlPwjpOVNnzn34lyrO0lR489D5hiJ2VdFoF7EvYDq2wfAcUETMUj AJJV9M7q6HlU6FTXIdD1nVIYYwLxTKh17kUwJIBUkK7g2ckd+p7WgRLwUL+U4LhnUrbS 88BQeTCyX9oSneGkX/XIJMANH1JIMKlq987kvfi9Jwu3IO8heBNjQe3JNyCoyIBcqE5C r14KyfVUCK2DPs+EL3vCGkIShUp8wmIdLEHOjtbfUl144pnEGGFEFKJlhFi/qSds+L4C EczTWrE0OgWD8kqUXRcCY/eBf8by4lrn14g7ldLKqA66pCBxbbWJBFgW5xjq+nWP9ZjC NtIw== 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=oPoEfiJ829HFiTJF4c1zGL5TdlrTqAGNgCQhkPxdZv8=; b=tfrqcr3Afq+Ib+rxD1ye5D/duRDNXgyd2EHLfdTGwzpz4aCIAatEwDfOSD4owGR1Ga eJsvkLH1nIdkorGCHKMPdj8h7v7s+sNdYpG9gUYdzfnMuxht018Ejoi17tVhpnSBoIla 6QlkHo2P/CHyDnmBdW3UtFTr0pAVZIhfKdj23Okua8BcutYDUSRKyiB+puj5SFC1PZ2S GSsKgLUgp6zrJ3/zsQdnau2c1CPgo1mAS79gGM8NGO5ZIc/NJTnh+hMIP4aQyI/BfY84 u6LGDgcVf/y93ZyipTp3eUknUI4nmOvHp1CtYxoQWMXGugzyVtLvI9Pmf70aMta4t254 Tk4Q== X-Gm-Message-State: APjAAAUFWtmMNnYtxRfZ9N2qjKefQ2rm6BzIb6H9TTdgbGLw84+k3gBK x8bmsVRkY9dPSYdDqLDJ2Mls30+J2kyafC4cUQY= X-Google-Smtp-Source: APXvYqxf6pyuy2b0C7kGwVb9cMM9HBx/dT4rTM6z4dJTmBDml32z4MNPrDuebbuZ9ExwOLM18YhheN7oDa5AKWC4xdM= X-Received: by 2002:a67:f7d0:: with SMTP id a16mr2505843vsp.108.1572646349491; Fri, 01 Nov 2019 15:12:29 -0700 (PDT) Date: Fri, 1 Nov 2019 15:11:46 -0700 In-Reply-To: <20191101221150.116536-1-samitolvanen@google.com> Message-Id: <20191101221150.116536-14-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20191101221150.116536-1-samitolvanen@google.com> X-Mailer: git-send-email 2.24.0.rc1.363.gb1bccd3e3d-goog Subject: [PATCH v4 13/17] arm64: preserve x18 when CPU is suspended From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Masami Hiramatsu , Ard Biesheuvel Cc: Dave Martin , Kees Cook , Laura Abbott , Mark Rutland , Marc Zyngier , Nick Desaulniers , Jann Horn , Miguel Ojeda , Masahiro Yamada , 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 Don't lose the current task's shadow stack when the CPU is suspended. Signed-off-by: Sami Tolvanen Reviewed-by: Nick Desaulniers Reviewed-by: Kees Cook --- arch/arm64/include/asm/suspend.h | 2 +- arch/arm64/mm/proc.S | 10 ++++++++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/suspend.h b/arch/arm64/include/asm/suspend.h index 8939c87c4dce..0cde2f473971 100644 --- a/arch/arm64/include/asm/suspend.h +++ b/arch/arm64/include/asm/suspend.h @@ -2,7 +2,7 @@ #ifndef __ASM_SUSPEND_H #define __ASM_SUSPEND_H -#define NR_CTX_REGS 12 +#define NR_CTX_REGS 13 #define NR_CALLEE_SAVED_REGS 12 /* diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index fdabf40a83c8..5616dc52a033 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -49,6 +49,8 @@ * cpu_do_suspend - save CPU registers context * * x0: virtual address of context pointer + * + * This must be kept in sync with struct cpu_suspend_ctx in . */ ENTRY(cpu_do_suspend) mrs x2, tpidr_el0 @@ -73,6 +75,9 @@ alternative_endif stp x8, x9, [x0, #48] stp x10, x11, [x0, #64] stp x12, x13, [x0, #80] +#ifdef CONFIG_SHADOW_CALL_STACK + str x18, [x0, #96] +#endif ret ENDPROC(cpu_do_suspend) @@ -89,6 +94,11 @@ ENTRY(cpu_do_resume) ldp x9, x10, [x0, #48] ldp x11, x12, [x0, #64] ldp x13, x14, [x0, #80] +#ifdef CONFIG_SHADOW_CALL_STACK + ldr x18, [x0, #96] + /* Clear the SCS pointer from the state buffer */ + str xzr, [x0, #96] +#endif msr tpidr_el0, x2 msr tpidrro_el0, x3 msr contextidr_el1, x4 -- 2.24.0.rc1.363.gb1bccd3e3d-goog