From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 20 Nov 2023 09:39:26 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1r4zoT-001DKM-2x for lore@lore.pengutronix.de; Mon, 20 Nov 2023 09:39:26 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1r4zoT-0008BB-Un for lore@pengutronix.de; Mon, 20 Nov 2023 09:39:26 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=nHm8VVjrNfGr4M1BCxBwhabrgyanu/BShpW7OOtK/EE=; b=BTEkjb2F3fwNFME6EUHpenHyFl ts3Ca4PKs/qHP1IqR853gULaH69e6dBFOOwibMrkXUVF7ldwcX5T46Yrs3CUQFsFQg3MQbllPhQ91 vKjS1nYg78ttHV4SCkfLcO9wXlFlM4u7U8uC2D1d38Fxk3uYEP3lXP9n96SxvLPvPF47846vMnwyT 5MXTgW8gQqz7/6siOltXDByg5brq3PKj6aOJJ+QtQrMBROfAgKeCXjUNpu5mAG6mnVRDAupCG2CDv u0cbHUgnM0ZD8EwQfGxQugyuVss8QUyE4gWhBASifCYHstBZTQwWEcFI5VKtCdopGjRC+ZMHaF0HF +JD26bvg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r4zn7-00BWEz-2q; Mon, 20 Nov 2023 08:38:02 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r4zn3-00BWDP-2E for barebox@lists.infradead.org; Mon, 20 Nov 2023 08:37:59 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1r4zn0-0007rA-89; Mon, 20 Nov 2023 09:37:54 +0100 Received: from [2a0a:edc0:0:1101:1d::54] (helo=dude05.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1r4zmz-00AJDq-Rg; Mon, 20 Nov 2023 09:37:53 +0100 Received: from localhost ([::1] helo=dude05.red.stw.pengutronix.de) by dude05.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1r4zmz-00GeDh-2T; Mon, 20 Nov 2023 09:37:53 +0100 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Mon, 20 Nov 2023 09:37:50 +0100 Message-Id: <20231120083750.3967831-3-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231120083750.3967831-1-a.fatoum@pengutronix.de> References: <20231120083750.3967831-1-a.fatoum@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231120_003757_724840_DDD94555 X-CRM114-Status: GOOD ( 12.51 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.0 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH RFC 3/3] uncompress: skip dentry cache in uncompress_buf_to_buf X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) make_temp() creates a named temporary file, which even after deletion will keep a negative dentry cache entry that's never freed. As we don't use the file name for anything, we can just get our temporary file via open(O_TMPFILE), which won't involve the dentry cache at all and thereby avoiding leaking memory when fuzzing uncompress_buf_to_buf. Signed-off-by: Ahmad Fatoum --- lib/uncompress.c | 34 +++++++++++++++------------------- 1 file changed, 15 insertions(+), 19 deletions(-) diff --git a/lib/uncompress.c b/lib/uncompress.c index 71ac882b87fe..bfe042fcf83e 100644 --- a/lib/uncompress.c +++ b/lib/uncompress.c @@ -185,30 +185,26 @@ int uncompress_buf_to_fd(const void *input, size_t input_len, ssize_t uncompress_buf_to_buf(const void *input, size_t input_len, void **buf, void(*error_fn)(char *x)) { - char *dstpath; size_t size; - int outfd, ret; + int fd, ret; + void *p; - dstpath = make_temp("data-uncompressed"); - if (!dstpath) - return -ENOMEM; + fd = open("/tmp", O_TMPFILE | O_RDWR); + if (fd < 0) + return -ENODEV; - outfd = open(dstpath, O_CREAT | O_WRONLY); - if (outfd < 0) { - ret = -ENODEV; - goto free_temp; - } - - ret = uncompress_buf_to_fd(input, input_len, outfd, error_fn); + ret = uncompress_buf_to_fd(input, input_len, fd, error_fn); if (ret) - goto close_outfd; + goto close_fd; - *buf = read_file(dstpath, &size); -close_outfd: - close(outfd); - unlink(dstpath); -free_temp: - free(dstpath); + p = read_fd(fd, &size); + if (p) + *buf = p; + else + ret = -errno; + +close_fd: + close(fd); return ret ?: size; } -- 2.39.2