From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CA0001B3925; Wed, 17 Sep 2025 12:49:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758113360; cv=none; b=GxOaY57nlphsRCGhI54Ypki5dW/y64aHZZd8Yg5it1CfTPdzogv1h/0BWKSLFAYQbESQId3/P1BTQMXo1YaGNvlOIMJoWBZ/eluQAbhPfd6rlYy/yKzWrwMkDPjlTFUVPqMAY/lhiSXe2SrSbbjShNEwVpX7YHhJ3jYtKA7raoU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758113360; c=relaxed/simple; bh=z2jLnjSHJclR7YDtARThHRnCI5nAdGHDf6klATNGeLE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FNkH5dtfwHITIfRpv/ZnJ7Re5bdFJAZa+vg9be+O87MnHHRjEcYAFnDECBa1aVqUKp+ktcjNdrgK0xaoyjTVZsHKwzz9CoYN4TsxhzXzAiDNcxAe/+CovfVC8nAeoJr1k0DhbVQ4y6DO3BZKuA13wQRd6OcTE0NaxpVi9G9JRT8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SKcPz0lu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="SKcPz0lu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40F3FC4CEF0; Wed, 17 Sep 2025 12:49:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758113360; bh=z2jLnjSHJclR7YDtARThHRnCI5nAdGHDf6klATNGeLE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SKcPz0luiyaXS4iGnY1BTC+gJv7CT7/GbTUt/tG3L418Qw8Mzfzf0rH5Jh4eGrCXE CLHaor7hbABUPQz4DWotedM8U2K8ZTa0o7ijO+wap412RwK8Q+6tGLO3slw1tkr9Gb HLIFqyvZtbCbPDDWmsZ7BrMdjtCHiDSTRAmk0XR8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Weimer , Miklos Szeredi Subject: [PATCH 6.12 061/140] fuse: prevent overflow in copy_file_range return value Date: Wed, 17 Sep 2025 14:33:53 +0200 Message-ID: <20250917123345.795430167@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250917123344.315037637@linuxfoundation.org> References: <20250917123344.315037637@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Miklos Szeredi commit 1e08938c3694f707bb165535df352ac97a8c75c9 upstream. The FUSE protocol uses struct fuse_write_out to convey the return value of copy_file_range, which is restricted to uint32_t. But the COPY_FILE_RANGE interface supports a 64-bit size copies. Currently the number of bytes copied is silently truncated to 32-bit, which may result in poor performance or even failure to copy in case of truncation to zero. Reported-by: Florian Weimer Closes: https://lore.kernel.org/all/lhuh5ynl8z5.fsf@oldenburg.str.redhat.com/ Fixes: 88bc7d5097a1 ("fuse: add support for copy_file_range()") Cc: # v4.20 Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -3229,7 +3229,7 @@ static ssize_t __fuse_copy_file_range(st .nodeid_out = ff_out->nodeid, .fh_out = ff_out->fh, .off_out = pos_out, - .len = len, + .len = min_t(size_t, len, UINT_MAX & PAGE_MASK), .flags = flags }; struct fuse_write_out outarg;