From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 19 Feb 2025 16:26:30 +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 1tkly3-004MGz-08 for lore@lore.pengutronix.de; Wed, 19 Feb 2025 16:26:30 +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 1tkly1-0000Sa-SZ for lore@pengutronix.de; Wed, 19 Feb 2025 16:26:30 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc: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: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=D+AjIu6my5PCNdJF/CwWboftJqoaU/Yv17tHpRs7CQA=; b=LRj7dsi1W8JfqP 35aHmGrwFqUw+yf4qNDrxfLbTD9bTTyXNZdWO7hXa9xpyE8o8tiIufsYmVd3rOK4mtaSxM1jPo0rP wIUOvnJvUOcyXe+l4q2r8TJNYrPx7Ys3v4H8ZcvGyTn6dafB/Dts6fLlciBggYRkzmlbSNl17FBcO NoGqsbb+1HIFzj+Xokl6MaQJ1yvsXMBICthVCGnDxsjh6Vz33xUswWG/BkoQwxUIT+d8pkqpp/s9X Ph3c0QOfjjE+mZIby0LplNhIlLSkdECR9D94QEXECiYJGkiNiLb4NtWhBBoe6Gk1Kud4qj9qBfgrs HAzib38KAoltPIMnqVHA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tklxm-0000000DXPh-2qYC; Wed, 19 Feb 2025 15:26:14 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tkkuf-0000000DFBX-219n for barebox@bombadil.infradead.org; Wed, 19 Feb 2025 14:18:57 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=D+AjIu6my5PCNdJF/CwWboftJqoaU/Yv17tHpRs7CQA=; b=HQUh7yOpttCNvFZctrI4WCEzKu m9Hge3TA5kFQckTKwS5JZOJBEVDNcZvoxd269BDbxUhNiWgG7zzSpwKFOvQEgcDFWOJ23uS3drKlf p/QfGvmM2R863zq9cdJNHxJN4KKiSonxmYyf/DNVUd5nRxvkIASaslX7/2WjoDHNGo1UJLl+CrVkg 2Pb1Ai9hI1YhHF7K7r2HXF7X3NNLNa2qgtStDB3RRAO/X81R40HSgXr6ksDmBzzvNKgIoxBTXVf/w g0Sgqi68xoNuQxjcFReMAe9a4dI26NjlubEICpJJXwYoVtZ0wMXDK5w7VoGByWDgxVxIEIHyzqNcI 3FHrIjCw==; Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by desiato.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tkkuc-00000002BEO-2O1p for barebox@lists.infradead.org; Wed, 19 Feb 2025 14:18:56 +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 1tkkuZ-0005Q7-9D; Wed, 19 Feb 2025 15:18:51 +0100 Received: from dude02.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::28]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tkkuZ-001mVv-0B; Wed, 19 Feb 2025 15:18:51 +0100 Received: from localhost ([::1] helo=dude02.red.stw.pengutronix.de) by dude02.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1tkkuY-0081Wd-32; Wed, 19 Feb 2025 15:18:50 +0100 From: Sascha Hauer To: Barebox List Date: Wed, 19 Feb 2025 15:18:42 +0100 Message-Id: <20250219141844.1912413-4-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250219141844.1912413-1-s.hauer@pengutronix.de> References: <20250219141844.1912413-1-s.hauer@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-20250219_141854_918591_CB5A114B X-CRM114-Status: GOOD ( 12.74 ) 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: , Cc: Jonathan Bar Or 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=-5.3 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 autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 3/5] CVE-2025-26723: fs: ext4: fix malloc(size + constant) buffer overflow issues 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) The pattern malloc(size + constant) is dangerous when size can be manipulated by an attacker. In that case 'size' can be manipulated in a way that 'size + constant' is 0 due to integer overflow. The result is a zero sized buffer to which is then data written to. Avoid this by using size_add() instead. Reported-by: Jonathan Bar Or Signed-off-by: Sascha Hauer --- fs/ext4/ext_barebox.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ext4/ext_barebox.c b/fs/ext4/ext_barebox.c index 163c4d2fe1..7480c045d7 100644 --- a/fs/ext4/ext_barebox.c +++ b/fs/ext4/ext_barebox.c @@ -189,7 +189,7 @@ static const char *ext_get_link(struct dentry *dentry, struct inode *inode) BUG_ON(inode->i_link); - inode->i_link = zalloc(inode->i_size + 1); + inode->i_link = zalloc(size_add(inode->i_size, 1)); ret = ext4fs_read_file(node, 0, inode->i_size, inode->i_link); if (ret == 0) { -- 2.39.5