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=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 E7675CA9EA0 for ; Fri, 18 Oct 2019 16:16:16 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 3B805205C9 for ; Fri, 18 Oct 2019 16:16:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="FGaZKiG+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3B805205C9 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-17034-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 22120 invoked by uid 550); 18 Oct 2019 16:14:49 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 10166 invoked from network); 18 Oct 2019 16:11:37 -0000 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=OMV7GU+CS755gzThihulnjNw1pxqVtHrVsdKKTavPQY=; b=FGaZKiG+Ux25snyrOJrBiRd7RwQxjjLhUDr+StQE9m6QImfqUDq6yp6j+8Toagonr0 9TtbMLb3ay20pI9YbGG7nJzzM0vR4AyRpchI4t/ZYgICefWGJVsG/b/aJxIHIw5w9UV3 EIJDiPWiyVwP1F234VZ4D2+fA00WZK8lZRp8IvN7MdZJh8XNzU3kgbsv5o54oZ+iiZsI KghuQJd7vpAsaqImv6J86r3heyO3yrp6I8mcuRhzR5+TbYZJ39FxxZRefwS+iHZszAKS nursS3e3ycHoRmOFQHS1v/YDrqGB9JFjdDc8idnF+2J0IDA0s0+5SNkcUWwuinwq2OFT V+bg== 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=OMV7GU+CS755gzThihulnjNw1pxqVtHrVsdKKTavPQY=; b=QPz0IGCGzZ17uV6kGavGB6bMOjAedl4gwcziyoBPT80y70GQF2wjwN/b92MxmbUnk8 tv4QQySFRpfG8HpGPwPlSO5JX+MBNC0OcC15Mz7o7krMZgeVeAcOpKlhBd1B/I/KQSOI yqTdtRrCQJGchz7jCp7QV/CcN5s59qgzRA+Ez2V411DKM9f5NBC4WofvSSa4nKHYO9cD Yd9/E7k6IQhB7lvMEmUO8dekBXGqmVr/A3bBAufoKHpyX1JsJ567DsSqYqAns0QNV1IT qHZZUzUt6EJ4hiRAU6Tit/cGr0OsCubDyRRWTWUeGrJ6lGjZ2jPFHB99/4TqNHBDy6+h P8dg== X-Gm-Message-State: APjAAAX3yVpUZ6Aqb6DTXk/GRNkwE7xGVcyh0e4ATxAnvXIhWe6T6TiQ 2RD4AL3A/QcpHuYfnFHaSF/oH9BXYTwHZMMc3VM= X-Google-Smtp-Source: APXvYqycxw3zlWpqg/6yGEhb7CgOxW1rmJc0Y43aPOFAV6KRrpZHK92ZxBUvHsBpIOsv4SiMThIv0qzjvIsHF4JRnyI= X-Received: by 2002:a63:1904:: with SMTP id z4mr11066720pgl.413.1571415085386; Fri, 18 Oct 2019 09:11:25 -0700 (PDT) Date: Fri, 18 Oct 2019 09:10:29 -0700 In-Reply-To: <20191018161033.261971-1-samitolvanen@google.com> Message-Id: <20191018161033.261971-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH 14/18] arm64: efi: restore x18 if it was corrupted From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Ard Biesheuvel Cc: Dave Martin , Kees Cook , Laura Abbott , Mark Rutland , Nick Desaulniers , 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" If we detect a corrupted x18 and SCS is enabled, restore the register before jumping back to instrumented code. Signed-off-by: Sami Tolvanen --- arch/arm64/kernel/efi-rt-wrapper.S | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/efi-rt-wrapper.S b/arch/arm64/kernel/efi-rt-wrapper.S index 3fc71106cb2b..945744f16086 100644 --- a/arch/arm64/kernel/efi-rt-wrapper.S +++ b/arch/arm64/kernel/efi-rt-wrapper.S @@ -34,5 +34,10 @@ ENTRY(__efi_rt_asm_wrapper) ldp x29, x30, [sp], #32 b.ne 0f ret -0: b efi_handle_corrupted_x18 // tail call +0: +#ifdef CONFIG_SHADOW_CALL_STACK + /* Restore x18 before returning to instrumented code. */ + mov x18, x2 +#endif + b efi_handle_corrupted_x18 // tail call ENDPROC(__efi_rt_asm_wrapper) -- 2.23.0.866.gb869b98d4c-goog