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=-14.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 72A2FC43381 for ; Wed, 17 Mar 2021 18:13:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F93A64F2A for ; Wed, 17 Mar 2021 18:13:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232263AbhCQSNY (ORCPT ); Wed, 17 Mar 2021 14:13:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:48074 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232836AbhCQSMu (ORCPT ); Wed, 17 Mar 2021 14:12:50 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C05BE64F3A; Wed, 17 Mar 2021 18:12:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616004770; bh=ii6DJh0iWgadMqKp28TfT7dEM/zMPaqma8oVTHy1Xkg=; h=From:To:Cc:Subject:Date:From; b=oOojIaKnnyL20NFl0Ht/vlhSoRdmlQLdTjk3gM+mdDtfS26rrBicNTsSKp1FuVScY gQjPmItLSwOPZDZxGG9B9BHXKghBYJblk4wzRBtVW5fB7QpSFKV7l7URoPoTEMA6L8 WCtdfyR01YrOIYKU06NSHw0fEauDDun+EL0slR8YBV+HvGFBM62a7vlfCeYRLJ627a dF2E7yo/mVw9VNjmnkGA0fGc4BAvdov9SV5oZDh7GQbEhO4NhB4mPgzKPURYozpmnz sKDI3j7Vtot4Cvpqcz3YZlWM6sNduSu5OKRp6FV9fMYtEIzl9wcRd+XtyFbCwEPfhR xidBkW5JK3qQA== From: Andy Lutomirski To: x86@kernel.org Cc: LKML , Mark Rutland , Brian Gerst , Andy Lutomirski Subject: [PATCH v4 0/9] kentry: A stable bugfix and a bunch of improvements Date: Wed, 17 Mar 2021 11:12:39 -0700 Message-Id: X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I noticed a little bug in fast compat syscalls. I got a bit carried away fixing it. This renames the irqentry stuff to kentry, improves (IMNSHO) the API, and adds lots of debugging. It also tweaks the unwinder wrt ret_from_fork and rewrites ret_from_fork in C. I did this because the kentry work involved a small change to ret_from_fork, and adjusting the asm is a mess. So C it is. Changes from v3: Get rid of arm64 special cases Changes from v1 and v2: Complete rewrite Andy Lutomirski (9): x86/dumpstack: Remove unnecessary range check fetching opcode bytes x86/kthread,dumpstack: Set task_pt_regs->cs.RPL=3 for kernel threads x86/entry: Convert ret_from_fork to C kentry: Simplify the common syscall API kentry: Remove enter_from/exit_to_user_mode() entry: Make CONFIG_DEBUG_ENTRY available outside x86 kentry: Add debugging checks for proper kentry API usage kentry: Check that syscall entries and syscall exits match kentry: Verify kentry state in instrumentation_begin/end() arch/x86/Kconfig.debug | 10 -- arch/x86/entry/common.c | 78 ++++++++++---- arch/x86/entry/entry_32.S | 51 ++------- arch/x86/entry/entry_64.S | 33 ++---- arch/x86/include/asm/switch_to.h | 2 +- arch/x86/kernel/dumpstack.c | 10 +- arch/x86/kernel/process.c | 15 ++- arch/x86/kernel/process_32.c | 2 +- arch/x86/kernel/traps.c | 4 +- arch/x86/kernel/unwind_orc.c | 2 +- include/asm-generic/bug.h | 8 +- include/linux/entry-common.h | 127 +++-------------------- include/linux/instrumentation.h | 25 ++++- include/linux/sched.h | 4 + init/init_task.c | 8 ++ kernel/entry/common.c | 173 ++++++++++++++++++++----------- lib/Kconfig.debug | 11 ++ 17 files changed, 267 insertions(+), 296 deletions(-) -- 2.30.2