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 CB264189B84; Wed, 17 Sep 2025 12:39:42 +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=1758112782; cv=none; b=NDgQ6FhB8mVsi7lZA2vkXEstzaOb79Us7UgyHFSgTe5gC6EFMc/wc8AOtNkfg1DgVSfq5eXsIWKth1I7fm20zMp41bRxi8p767g2FCzJuZTkZwwbjIiXO6pN59gaA4UGICRSYJo3kdSP3P34p2bRjS5gazwXpkWMnYMejDhAbkg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758112782; c=relaxed/simple; bh=ls2qqCKcD8OQuAK5mEUDWGksOtpYg5qsqn1A0WCl7Jw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=f4zVk0uvArK2j2+sUlOoeMtwmPbuO1EoxkqaniwmZWYD/37Q9pkq+kxkm7n5X+n2JZiLV0NwRlt5gjjKAuYwx5jl98WJ/fhhMYXZLmEOUSw7wsqlj/FlU46YwI+uPQ0ghsIzL8lY13DGv30wTSGrLES0mq14oav0EObHQJksJeE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=WUNFAAI9; 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="WUNFAAI9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA6D6C4CEF0; Wed, 17 Sep 2025 12:39:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758112782; bh=ls2qqCKcD8OQuAK5mEUDWGksOtpYg5qsqn1A0WCl7Jw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WUNFAAI9OXxpDjApnZu/E0proxFT7o+jCQ8P/0DLJERuo3fIyVugIM+qv3EYWMc8T AfiX1aXgZkSrGSJBnVuLtStBxhNY/2RhdfM1EZPAKO30I0RxqbDdk3c/abfv7WQ8GF cDF9K1inISxEeG6DxaQqjHRuQ/VbpSjjEPXCCkaM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Weimer , Miklos Szeredi Subject: [PATCH 6.16 075/189] fuse: prevent overflow in copy_file_range return value Date: Wed, 17 Sep 2025 14:33:05 +0200 Message-ID: <20250917123353.700372460@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250917123351.839989757@linuxfoundation.org> References: <20250917123351.839989757@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.16-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 @@ -3013,7 +3013,7 @@ 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;