From patchwork Fri Nov 25 09:13:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhen Lei X-Patchwork-Id: 13055622 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5BC48C4321E for ; Fri, 25 Nov 2022 09:15:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229784AbiKYJO4 (ORCPT ); Fri, 25 Nov 2022 04:14:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229558AbiKYJOv (ORCPT ); Fri, 25 Nov 2022 04:14:51 -0500 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0510313E9F; Fri, 25 Nov 2022 01:14:50 -0800 (PST) Received: from dggpemm500023.china.huawei.com (unknown [172.30.72.57]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4NJTh24qjfzHtd9; Fri, 25 Nov 2022 17:14:10 +0800 (CST) Received: from dggpemm500006.china.huawei.com (7.185.36.236) by dggpemm500023.china.huawei.com (7.185.36.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 25 Nov 2022 17:14:48 +0800 Received: from thunder-town.china.huawei.com (10.174.178.55) by dggpemm500006.china.huawei.com (7.185.36.236) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 25 Nov 2022 17:14:48 +0800 From: Zhen Lei To: Alexander Viro , Eric Biggers , , Chris Mason , Josef Bacik , David Sterba , , CC: Zhen Lei Subject: [PATCH v3 2/2] fs: clear a UBSAN shift-out-of-bounds warning Date: Fri, 25 Nov 2022 17:13:58 +0800 Message-ID: <20221125091358.1963-3-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.37.3.windows.1 In-Reply-To: <20221125091358.1963-1-thunder.leizhen@huawei.com> References: <20221125091358.1963-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.178.55] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500006.china.huawei.com (7.185.36.236) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org UBSAN: shift-out-of-bounds in fs/locks.c:2572:16 left shift of 1 by 63 places cannot be represented in type 'long long int' Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106 ubsan_epilogue+0xa/0x44 lib/ubsan.c:151 __ubsan_handle_shift_out_of_bounds+0x1e7/0x208 lib/ubsan.c:322 locks_remove_posix+0xba/0x290 fs/locks.c:2572 filp_close+0x61/0xa0 fs/open.c:1424 close_fd+0x56/0x70 fs/file.c:664 __do_sys_close fs/open.c:1439 [inline] __se_sys_close fs/open.c:1437 [inline] __x64_sys_close+0x1a/0x50 fs/open.c:1437 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd INT_LIMIT() tries to do what type_max() does, except that type_max() doesn't rely upon undefined behaviour, might as well use type_max() instead. Suggested-by: Eric Biggers Signed-off-by: Zhen Lei Reviewed-by: Eric Biggers --- include/linux/fs.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index e654435f16512c1..a384741b1449457 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1131,9 +1131,8 @@ struct file_lock_context { /* The following constant reflects the upper bound of the file/locking space */ #ifndef OFFSET_MAX -#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) -#define OFFSET_MAX INT_LIMIT(loff_t) -#define OFFT_OFFSET_MAX INT_LIMIT(off_t) +#define OFFSET_MAX type_max(loff_t) +#define OFFT_OFFSET_MAX type_max(off_t) #endif extern void send_sigio(struct fown_struct *fown, int fd, int band);