From nobody Wed Sep 17 15:57:57 2025 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 A11CEC4332F for ; Sat, 17 Dec 2022 00:14:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230502AbiLQAOm (ORCPT ); Fri, 16 Dec 2022 19:14:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229726AbiLQANg (ORCPT ); Fri, 16 Dec 2022 19:13:36 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C25176165; Fri, 16 Dec 2022 16:11:28 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 7E951CE1EBA; Sat, 17 Dec 2022 00:11:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2B79C433EF; Sat, 17 Dec 2022 00:11:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1671235884; bh=PLWjoElbUUTrwiueek+ck3ZZEqIQCzSUwGIQlRGcNmA=; h=From:To:Cc:Subject:Date:From; b=TN9BFkUH1TWsdjogqt4Uchmmg2roCwf1UWvZvw2PPWvWUtZkK7fL8UfO3IaELs6HX qXFvzFMQAwh/bafUaTn1A4GpZ7qfrPEb+ZXkUmoD5BBkuNb+B535QveMhbYVpyxsaH EcBnaYLdQCojHw6d12pOEVAMkjXc1rXzvnzvz72VhLhhQVMli/8+qTQG0bfwaQCTEa Zcx65QhrCbHVYhOrmqQMdG3G4r3+yt7YlSQmg01Nu+h4Is6mg/SGLpO/cUJLfJ0+oo 0rpO+w6tm+l3gFeBkPLtW1iAyurzQ03SqXk5i/HqpT8gh/lYQIjDq8NgFGgkNsodY7 dt0iLuo9mY5XQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Liu Shixin , Kees Cook , Sasha Levin , viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH AUTOSEL 4.19] binfmt_misc: fix shift-out-of-bounds in check_special_flags Date: Fri, 16 Dec 2022 19:11:21 -0500 Message-Id: <20221217001121.41535-1-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Liu Shixin [ Upstream commit 6a46bf558803dd2b959ca7435a5c143efe837217 ] UBSAN reported a shift-out-of-bounds warning: left shift of 1 by 31 places cannot be represented in type '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 check_special_flags fs/binfmt_misc.c:241 [inline] create_entry fs/binfmt_misc.c:456 [inline] bm_register_write+0x9d3/0xa20 fs/binfmt_misc.c:654 vfs_write+0x11e/0x580 fs/read_write.c:582 ksys_write+0xcf/0x120 fs/read_write.c:637 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 RIP: 0033:0x4194e1 Since the type of Node's flags is unsigned long, we should define these macros with same type too. Signed-off-by: Liu Shixin Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20221102025123.1117184-1-liushixin2@huawei.= com Signed-off-by: Sasha Levin --- fs/binfmt_misc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index 27a04f492541..8fe7edd2b001 100644 --- a/fs/binfmt_misc.c +++ b/fs/binfmt_misc.c @@ -42,10 +42,10 @@ static LIST_HEAD(entries); static int enabled =3D 1; =20 enum {Enabled, Magic}; -#define MISC_FMT_PRESERVE_ARGV0 (1 << 31) -#define MISC_FMT_OPEN_BINARY (1 << 30) -#define MISC_FMT_CREDENTIALS (1 << 29) -#define MISC_FMT_OPEN_FILE (1 << 28) +#define MISC_FMT_PRESERVE_ARGV0 (1UL << 31) +#define MISC_FMT_OPEN_BINARY (1UL << 30) +#define MISC_FMT_CREDENTIALS (1UL << 29) +#define MISC_FMT_OPEN_FILE (1UL << 28) =20 typedef struct { struct list_head list; --=20 2.35.1