From patchwork Fri Oct 30 15:49:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 11870153 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 AF36B1130 for ; Fri, 30 Oct 2020 15:49:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5F33622249 for ; Fri, 30 Oct 2020 15:49:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ugPQTkip" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5F33622249 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 615716B006E; Fri, 30 Oct 2020 11:49:46 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 57A3D6B0083; Fri, 30 Oct 2020 11:49:46 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 359D06B0085; Fri, 30 Oct 2020 11:49:46 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0103.hostedemail.com [216.40.44.103]) by kanga.kvack.org (Postfix) with ESMTP id E5E0E6B006E for ; Fri, 30 Oct 2020 11:49:45 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 902ED181AEF10 for ; Fri, 30 Oct 2020 15:49:45 +0000 (UTC) X-FDA: 77429027130.17.brain83_4907bea27297 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 71055180D0180 for ; Fri, 30 Oct 2020 15:49:45 +0000 (UTC) X-Spam-Summary: 1,0,0,f5b86c55cae5df11,d41d8cd98f00b204,arnd@kernel.org,,RULES_HIT:41:69:355:379:541:800:960:973:988:989:1260:1311:1314:1345:1359:1431:1437:1515:1535:1543:1711:1730:1747:1777:1792:2198:2199:2393:2559:2562:3138:3139:3140:3141:3142:3355:3865:3866:3867:3868:3871:3872:4321:4605:5007:6119:6261:6653:7576:7903:7904:9592:9707:10004:11026:11658:11914:12043:12291:12297:12517:12519:12555:12679:12683:12895:13161:13229:13894:14096:14110:14181:14394:14721:21080:21627:21795:21990:30051:30054:30070:30079,0,RBL:198.145.29.99:@kernel.org:.lbl8.mailshell.net-62.2.0.100 64.100.201.201;04y845rjdj9t3np3yr769j583nomfyp5ih3zofx6yr4c5kmke7opidd17ptegrf.paftoi8mrmmr1jgkckwq4fura38a9ozs4ph4g9k3ichh5akrys6sm1d8s9i9kec.o-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:69,LUA_SUMMARY:none X-HE-Tag: brain83_4907bea27297 X-Filterd-Recvd-Size: 5122 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf42.hostedemail.com (Postfix) with ESMTP for ; Fri, 30 Oct 2020 15:49:44 +0000 (UTC) Received: from localhost.localdomain (HSI-KBW-46-223-126-90.hsi.kabel-badenwuerttemberg.de [46.223.126.90]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0B43B22241; Fri, 30 Oct 2020 15:49:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604072983; bh=Mx21NEzsW0sqOlRSKKtH114cIyZ8zXg4jMUbhna5VF0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ugPQTkip7iCrZSHrqBz6Pc8ED6zMvRtbryCcPbLZLzqUBWWz6eL+SfaLIu5/pSc6V TS+HeRVtV2vG7RW/aipBaP6YOToLXIC/1wQbnJfLxsTA22Cfp/tGzuBNIK8DWVVd2Q CGoec7enG38Hfk3qgtSkzJ35WeM5bIJXZf0w67YQ= From: Arnd Bergmann To: Russell King , Christoph Hellwig Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, viro@zeniv.linux.org.uk, linus.walleij@linaro.org, arnd@arndb.de Subject: [PATCH 7/9] ARM: oabi-compat: rework fcntl64() emulation Date: Fri, 30 Oct 2020 16:49:17 +0100 Message-Id: <20201030154919.1246645-7-arnd@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201030154919.1246645-1-arnd@kernel.org> References: <20201030154519.1245983-1-arnd@kernel.org> <20201030154919.1246645-1-arnd@kernel.org> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Arnd Bergmann This is one of the last users of get_fs(), and this is fairly easy to change, since the infrastructure for it is already there. The replacement here is essentially a copy of the existing fcntl64() syscall entry function. Signed-off-by: Arnd Bergmann --- arch/arm/kernel/sys_oabi-compat.c | 93 ++++++++++++++++++++----------- 1 file changed, 60 insertions(+), 33 deletions(-) diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c index c3e63b73b6ae..3449e163ea88 100644 --- a/arch/arm/kernel/sys_oabi-compat.c +++ b/arch/arm/kernel/sys_oabi-compat.c @@ -194,56 +194,83 @@ struct oabi_flock64 { pid_t l_pid; } __attribute__ ((packed,aligned(4))); -static long do_locks(unsigned int fd, unsigned int cmd, - unsigned long arg) +static int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg) { - struct flock64 kernel; struct oabi_flock64 user; - mm_segment_t fs; - long ret; if (copy_from_user(&user, (struct oabi_flock64 __user *)arg, sizeof(user))) return -EFAULT; - kernel.l_type = user.l_type; - kernel.l_whence = user.l_whence; - kernel.l_start = user.l_start; - kernel.l_len = user.l_len; - kernel.l_pid = user.l_pid; - - fs = get_fs(); - set_fs(KERNEL_DS); - ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel); - set_fs(fs); - - if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) { - user.l_type = kernel.l_type; - user.l_whence = kernel.l_whence; - user.l_start = kernel.l_start; - user.l_len = kernel.l_len; - user.l_pid = kernel.l_pid; - if (copy_to_user((struct oabi_flock64 __user *)arg, - &user, sizeof(user))) - ret = -EFAULT; - } - return ret; + + kernel->l_type = user.l_type; + kernel->l_whence = user.l_whence; + kernel->l_start = user.l_start; + kernel->l_len = user.l_len; + kernel->l_pid = user.l_pid; + + return 0; +} + +static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg) +{ + struct oabi_flock64 user; + + user.l_type = kernel->l_type; + user.l_whence = kernel->l_whence; + user.l_start = kernel->l_start; + user.l_len = kernel->l_len; + user.l_pid = kernel->l_pid; + + if (copy_to_user((struct oabi_flock64 __user *)arg, + &user, sizeof(user))) + return -EFAULT; + + return 0; } asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) { + void __user *argp = (void __user *)arg; + struct fd f = fdget_raw(fd); + struct flock64 flock; + long err = -EBADF; + + if (!f.file) + goto out; + switch (cmd) { - case F_OFD_GETLK: - case F_OFD_SETLK: - case F_OFD_SETLKW: case F_GETLK64: + case F_OFD_GETLK: + err = security_file_fcntl(f.file, cmd, arg); + if (err) + break; + err = get_oabi_flock(&flock, argp); + if (err) + break; + err = fcntl_getlk64(f.file, cmd, &flock); + if (!err) + err = put_oabi_flock(&flock, argp); + break; case F_SETLK64: case F_SETLKW64: - return do_locks(fd, cmd, arg); - + case F_OFD_SETLK: + case F_OFD_SETLKW: + err = security_file_fcntl(f.file, cmd, arg); + if (err) + break; + err = get_oabi_flock(&flock, argp); + if (err) + break; + err = fcntl_setlk64(fd, f.file, cmd, &flock); + break; default: - return sys_fcntl64(fd, cmd, arg); + err = sys_fcntl64(fd, cmd, arg); + break; } + fdput(f); +out: + return err; } struct oabi_epoll_event {