From patchwork Mon May 14 09:46:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 10397731 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 35EF5600D0 for ; Mon, 14 May 2018 09:50:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 26A6028DA8 for ; Mon, 14 May 2018 09:50:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1B540290FC; Mon, 14 May 2018 09:50:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E3B128DA8 for ; Mon, 14 May 2018 09:50:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751402AbeENJun (ORCPT ); Mon, 14 May 2018 05:50:43 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:38320 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752576AbeENJrx (ORCPT ); Mon, 14 May 2018 05:47:53 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 40DB21991; Mon, 14 May 2018 02:47:53 -0700 (PDT) Received: from lakrids.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 53E6E3F25D; Mon, 14 May 2018 02:47:51 -0700 (PDT) From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, catalin.marinas@arm.com, dave.martin@arm.com, james.morse@arm.com, linux@dominikbrodowski.net, linux-fsdevel@vger.kernel.org, marc.zyngier@arm.com, mark.rutland@arm.com, viro@zeniv.linux.org.uk, will.deacon@arm.com Subject: [PATCH 12/18] kernel: add ksys_personality() Date: Mon, 14 May 2018 10:46:34 +0100 Message-Id: <20180514094640.27569-13-mark.rutland@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180514094640.27569-1-mark.rutland@arm.com> References: <20180514094640.27569-1-mark.rutland@arm.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Using this helper allows us to avoid the in-kernel call to the sys_personality() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_personality(). This is necessary to enable conversion of arm64's syscall handling to use pt_regs wrappers. Signed-off-by: Mark Rutland Cc: Al Viro Cc: Dominik Brodowski Reviewed-by: Dave Martin --- include/linux/syscalls.h | 1 + kernel/exec_domain.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 70fcda1a9049..6723ea51ec99 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -1148,6 +1148,7 @@ unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff); ssize_t ksys_readahead(int fd, loff_t offset, size_t count); +unsigned int ksys_personality(unsigned int personality); /* * The following kernel syscall equivalents are just wrappers to fs-internal diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c index a5697119290e..4ba2b404cba2 100644 --- a/kernel/exec_domain.c +++ b/kernel/exec_domain.c @@ -47,7 +47,7 @@ static int __init proc_execdomains_init(void) module_init(proc_execdomains_init); #endif -SYSCALL_DEFINE1(personality, unsigned int, personality) +unsigned int ksys_personality(unsigned int personality) { unsigned int old = current->personality; @@ -56,3 +56,8 @@ SYSCALL_DEFINE1(personality, unsigned int, personality) return old; } + +SYSCALL_DEFINE1(personality, unsigned int, personality) +{ + return ksys_personality(personality); +}