From patchwork Mon Mar 16 16:50:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 11440775 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7366E139A for ; Mon, 16 Mar 2020 16:51:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 548BB2075E for ; Mon, 16 Mar 2020 16:51:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584377490; bh=ccLXW7toP4MsaOSeKbrvj6G9pQutlrbfOnP/ogI6MyY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Bwm9a8BXYZeRBpujRLcZalOdx1ogaoAQvxFHn2dKTlXrAlehN91Y2uX7iBfffh1yq o29P3Qq4OeREq2u+Lofy4dchpZChIYCVGTetDSCIUiVKnxxCBkKtdP1fnBzenyPZRl jo2YLlaGQRcfs5V7P9eR3RfwJ6hl/jljwVe7JJWk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732293AbgCPQv0 (ORCPT ); Mon, 16 Mar 2020 12:51:26 -0400 Received: from foss.arm.com ([217.140.110.172]:52350 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732287AbgCPQvZ (ORCPT ); Mon, 16 Mar 2020 12:51:25 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 14FE413A1; Mon, 16 Mar 2020 09:51:25 -0700 (PDT) Received: from localhost (unknown [10.37.6.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 691513F67D; Mon, 16 Mar 2020 09:51:24 -0700 (PDT) From: Mark Brown To: Catalin Marinas , Will Deacon Cc: Alexander Viro , Paul Elliott , Peter Zijlstra , Yu-cheng Yu , Amit Kachhap , Vincenzo Frascino , Marc Zyngier , Eugene Syromiatnikov , Szabolcs Nagy , "H . J . Lu " , Andrew Jones , Kees Cook , Arnd Bergmann , Jann Horn , Richard Henderson , =?utf-8?q?Kristina_Mart?= =?utf-8?q?=C5=A1enko?= , Thomas Gleixner , Florian Weimer , Sudakshina Das , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, Daniel Kiss , Mark Brown Subject: [PATCH v10 12/13] mm: smaps: Report arm64 guarded pages in smaps Date: Mon, 16 Mar 2020 16:50:54 +0000 Message-Id: <20200316165055.31179-13-broonie@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200316165055.31179-1-broonie@kernel.org> References: <20200316165055.31179-1-broonie@kernel.org> MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Daniel Kiss The arm64 Branch Target Identification support is activated by marking executable pages as guarded pages. Report pages mapped this way in smaps to aid diagnostics. Signed-off-by: Daniel Kiss Reviewed-by: Kees Cook Signed-off-by: Mark Brown --- Documentation/filesystems/proc.txt | 1 + fs/proc/task_mmu.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 99ca040e3f90..ed5465d0f435 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -519,6 +519,7 @@ manner. The codes are the following: hg - huge page advise flag nh - no-huge page advise flag mg - mergable advise flag + bt - arm64 BTI guarded page Note that there is no guarantee that every flag and associated mnemonic will be present in all further kernel releases. Things get changed, the flags may diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 3ba9ae83bff5..1e3409c484d1 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -668,6 +668,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) [ilog2(VM_ARCH_1)] = "ar", [ilog2(VM_WIPEONFORK)] = "wf", [ilog2(VM_DONTDUMP)] = "dd", +#ifdef CONFIG_ARM64_BTI + [ilog2(VM_ARM64_BTI)] = "bt", +#endif #ifdef CONFIG_MEM_SOFT_DIRTY [ilog2(VM_SOFTDIRTY)] = "sd", #endif