From nobody Mon Feb 9 00:01:11 2026 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 299E3EB64D9 for ; Tue, 27 Jun 2023 19:38:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230353AbjF0Til (ORCPT ); Tue, 27 Jun 2023 15:38:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230195AbjF0TiZ (ORCPT ); Tue, 27 Jun 2023 15:38:25 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AB0D1FC1 for ; Tue, 27 Jun 2023 12:38:22 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id d9443c01a7336-1b7e66ff65fso30490535ad.0 for ; Tue, 27 Jun 2023 12:38:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1687894702; x=1690486702; h=mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=iaXp4mrMe/jXAKy0jRBzak4I8/V0aXguqJa0gdgX48g=; b=bw6IbBSqh+nxxv8KlezHQ267LmMa24v0mn0cdGQp1HTA9Dsb8q0yr+M2UkaHihh+UN suwkhkrZokLrb22hsYzHIrNXvT/GU+8erOy0ofWdfufu1U2PkrTkTagKhYi6LDcemMYi SwJFK64t3YyOnt96w2w8Gif1yOCEx8nkYCY9M= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687894702; x=1690486702; h=mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=iaXp4mrMe/jXAKy0jRBzak4I8/V0aXguqJa0gdgX48g=; b=LwM86npRTLd1Bp23EcKM7oVmcVXHflWy/9jBcKwTwrNzApnFB27HLTVmcDl+EWn9q/ 6kY38AtgJjk/KrCREXesnR24nbpqvPlwtZ+gwak1fFMdNmyP0JOWr40kuKC/CoRU3vl2 Bb4k93a2OkZRpBXm4x922WiMKaUzXBAeDfJOCQD9RmDLsxCOfcE2ORqfuFCHdWC877rv wOkxrBW7trjzR4aP/OYt/8/Ka9X8ZJY7s1g9r+DjVsaYXGfJk64/0VH7zjPFSNZL03F8 IeaIKVOC/SNVnUjMnlv+otZHCL5NCiFsMVqLHlncOKK/Wxcen89fiVEzmgUd7LQvnCvs 6/rg== X-Gm-Message-State: AC+VfDydB3wkWXzUhzqEPze0ci4xab5SS2Hh+Fndf9cIXa9JEt3O3HcL 2ZztAP7iQBKgj9wucOdQzpaRYA== X-Google-Smtp-Source: ACHHUZ6NyxgYQLqtldZYv7rAnb6xk6MCzhsSbzJfVmaG+krVdplmz//ix/nF7pWnpBt4G+123EAmTA== X-Received: by 2002:a17:902:7c06:b0:1b3:a928:18e8 with SMTP id x6-20020a1709027c0600b001b3a92818e8mr9757938pll.52.1687894702074; Tue, 27 Jun 2023 12:38:22 -0700 (PDT) Received: from ubuntu-22.localdomain ([192.19.222.250]) by smtp.gmail.com with ESMTPSA id g7-20020a1709026b4700b001b7f40a8959sm4986919plt.76.2023.06.27.12.38.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jun 2023 12:38:20 -0700 (PDT) From: William Zhang To: Broadcom Kernel List , Linux MTD List Cc: f.fainelli@gmail.com, rafal@milecki.pl, kursad.oney@broadcom.com, joel.peshkin@broadcom.com, computersforpeace@gmail.com, anand.gore@broadcom.com, dregan@mail.com, kamal.dasu@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, William Zhang , Florian Fainelli , Miquel Raynal , linux-kernel@vger.kernel.org, Vignesh Raghavendra , Richard Weinberger , Kamal Dasu Subject: [PATCH v3 4/5] mtd: rawnand: brcmnand: Fix potential out-of-bounds access in oob write Date: Tue, 27 Jun 2023 12:37:37 -0700 Message-Id: <20230627193738.19596-5-william.zhang@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230627193738.19596-1-william.zhang@broadcom.com> References: <20230627193738.19596-1-william.zhang@broadcom.com> MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000027474205ff219c80" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --00000000000027474205ff219c80 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" When the oob buffer length is not in multiple of words, the oob write function does out-of-bounds read on the oob source buffer at the last iteration. Fix that by always checking length limit on the oob buffer read and fill with 0xff when reaching the end of the buffer to the oob registers. Fixes: 27c5b17cd1b1 ("mtd: nand: add NAND driver "library" for Broadcom STB= NAND controller") Signed-off-by: William Zhang Reviewed-by: Florian Fainelli --- Changes in v3: - Fix kernel test robot sparse warning: drivers/mtd/nand/raw/brcmnand/brcmnand.c:1500:54: sparse: expected unsig= ned int [usertype] data drivers/mtd/nand/raw/brcmnand/brcmnand.c:1500:54: sparse: got restricted= __be32 [usertype] Changes in v2: - Handle the remaining unaligned oob data after the oob data write loop drivers/mtd/nand/raw/brcmnand/brcmnand.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/ra= w/brcmnand/brcmnand.c index ea03104692bf..407bf79cbaf4 100644 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -1477,19 +1477,28 @@ static int write_oob_to_regs(struct brcmnand_contro= ller *ctrl, int i, const u8 *oob, int sas, int sector_1k) { int tbytes =3D sas << sector_1k; - int j; + int j, k =3D 0; + u32 last =3D 0xffffffff; + u8 *plast =3D (u8 *)&last; =20 /* Adjust OOB values for 1K sector size */ if (sector_1k && (i & 0x01)) tbytes =3D max(0, tbytes - (int)ctrl->max_oob); tbytes =3D min_t(int, tbytes, ctrl->max_oob); =20 - for (j =3D 0; j < tbytes; j +=3D 4) + for (j =3D 0; (j + 3) < tbytes; j +=3D 4) oob_reg_write(ctrl, j, (oob[j + 0] << 24) | (oob[j + 1] << 16) | (oob[j + 2] << 8) | (oob[j + 3] << 0)); + + while (j < tbytes) + plast[k++] =3D oob[j++]; + + if (tbytes & 0x3) + oob_reg_write(ctrl, (tbytes & ~0x3), (__force u32)cpu_to_be32(last)); + return tbytes; } =20 --=20 2.37.3 --00000000000027474205ff219c80 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQcAYJKoZIhvcNAQcCoIIQYTCCEF0CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg 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