From patchwork Wed Nov 15 18:03:45 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 10060005 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 67D90604D4 for ; Wed, 15 Nov 2017 18:03:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 581802A17D for ; Wed, 15 Nov 2017 18:03:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4CD992A185; Wed, 15 Nov 2017 18:03:53 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham 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 C41302A17D for ; Wed, 15 Nov 2017 18:03:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757867AbdKOSDu (ORCPT ); Wed, 15 Nov 2017 13:03:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:38582 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757836AbdKOSDs (ORCPT ); Wed, 15 Nov 2017 13:03:48 -0500 Received: from tleilax.poochiereds.net (cpe-71-70-156-158.nc.res.rr.com [71.70.156.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6AD18218D7; Wed, 15 Nov 2017 18:03:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6AD18218D7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=jlayton@kernel.org From: Jeff Layton To: linux-fsdevel@vger.kernel.org Cc: Vitaly Lipatov , hch@lst.de, bfields@fieldses.org, Alexander Viro , linux-kernel@vger.kernel.org Subject: [PATCH v2] fcntl: don't cap l_start and l_end values for F_GETLK64 in compat syscall Date: Wed, 15 Nov 2017 13:03:45 -0500 Message-Id: <20171115180345.8219-1-jlayton@kernel.org> X-Mailer: git-send-email 2.14.3 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 From: Jeff Layton Currently, we're capping the values too low in the F_GETLK64 case. The fields in that structure are 64-bit values, so we shouldn't need to do any sort of fixup there. Make sure we check that assumption at build time in the future however by ensuring that the sizes we're copying will fit. With this, we no longer need COMPAT_OFF_T_MAX either, so remove it. Fixes: 94073ad77fff2 (fs/locks: don't mess with the address limit in compat_fcntl64) Reported-by: Vitaly Lipatov Signed-off-by: Jeff Layton Reviewed-by: Christoph Hellwig --- arch/arm64/include/asm/compat.h | 1 - arch/mips/include/asm/compat.h | 1 - arch/parisc/include/asm/compat.h | 1 - arch/powerpc/include/asm/compat.h | 1 - arch/s390/include/asm/compat.h | 1 - arch/sparc/include/asm/compat.h | 1 - arch/tile/include/asm/compat.h | 1 - arch/x86/include/asm/compat.h | 1 - fs/fcntl.c | 11 +++++------ 9 files changed, 5 insertions(+), 14 deletions(-) diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index e39d487bf724..a3c7f271ad4c 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -215,7 +215,6 @@ typedef struct compat_siginfo { } compat_siginfo_t; #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL /* * A pointer passed in from user mode. This should not diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h index 8e2b5b556488..49691331ada4 100644 --- a/arch/mips/include/asm/compat.h +++ b/arch/mips/include/asm/compat.h @@ -200,7 +200,6 @@ typedef struct compat_siginfo { } compat_siginfo_t; #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL /* * A pointer passed in from user mode. This should not diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h index 07f48827afda..acf8aa07cbe0 100644 --- a/arch/parisc/include/asm/compat.h +++ b/arch/parisc/include/asm/compat.h @@ -195,7 +195,6 @@ typedef struct compat_siginfo { } compat_siginfo_t; #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL struct compat_ipc64_perm { compat_key_t key; diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h index a035b1e5dfa7..8a2aecfe9b02 100644 --- a/arch/powerpc/include/asm/compat.h +++ b/arch/powerpc/include/asm/compat.h @@ -185,7 +185,6 @@ typedef struct compat_siginfo { } compat_siginfo_t; #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL /* * A pointer passed in from user mode. This should not diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h index 1b60eb3676d5..5e6a63641a5f 100644 --- a/arch/s390/include/asm/compat.h +++ b/arch/s390/include/asm/compat.h @@ -263,7 +263,6 @@ typedef struct compat_siginfo { #define si_overrun _sifields._timer._overrun #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL /* * A pointer passed in from user mode. This should not diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h index 977c3f280ba1..fa38c78de0f0 100644 --- a/arch/sparc/include/asm/compat.h +++ b/arch/sparc/include/asm/compat.h @@ -209,7 +209,6 @@ typedef struct compat_siginfo { } compat_siginfo_t; #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL /* * A pointer passed in from user mode. This should not diff --git a/arch/tile/include/asm/compat.h b/arch/tile/include/asm/compat.h index c14e36f008c8..62a7b83025dd 100644 --- a/arch/tile/include/asm/compat.h +++ b/arch/tile/include/asm/compat.h @@ -173,7 +173,6 @@ typedef struct compat_siginfo { } compat_siginfo_t; #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL struct compat_ipc64_perm { compat_key_t key; diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h index a600a6cda9ec..2cbd75dd2fd3 100644 --- a/arch/x86/include/asm/compat.h +++ b/arch/x86/include/asm/compat.h @@ -210,7 +210,6 @@ typedef struct compat_siginfo { } compat_siginfo_t; #define COMPAT_OFF_T_MAX 0x7fffffff -#define COMPAT_LOFF_T_MAX 0x7fffffffffffffffL struct compat_ipc64_perm { compat_key_t key; diff --git a/fs/fcntl.c b/fs/fcntl.c index e15bcc4265d0..0522e283a4f4 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -563,6 +563,9 @@ static int put_compat_flock64(const struct flock *kfl, struct compat_flock64 __u { struct compat_flock64 fl; + BUILD_BUG_ON(sizeof(kfl->l_start) > sizeof(ufl->l_start)); + BUILD_BUG_ON(sizeof(kfl->l_len) > sizeof(ufl->l_len)); + memset(&fl, 0, sizeof(struct compat_flock64)); copy_flock_fields(&fl, kfl); if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64))) @@ -641,12 +644,8 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, if (err) break; err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock); - if (err) - break; - err = fixup_compat_flock(&flock); - if (err) - return err; - err = put_compat_flock64(&flock, compat_ptr(arg)); + if (!err) + err = put_compat_flock64(&flock, compat_ptr(arg)); break; case F_SETLK: case F_SETLKW: