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Tue, 04 Jul 2023 17:43:13 -0700 (PDT) Subject: Re: [PATCH v3 4/5] mtd: rawnand: brcmnand: Fix potential out-of-bounds access in oob write To: Miquel Raynal Cc: Broadcom Kernel List , Linux MTD List , 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, Florian Fainelli , linux-kernel@vger.kernel.org, Vignesh Raghavendra , Richard Weinberger , Kamal Dasu References: <20230627193738.19596-1-william.zhang@broadcom.com> <20230627193738.19596-5-william.zhang@broadcom.com> <20230704172817.02e4cdb8@xps-13> From: William Zhang Message-ID: <5aa6cb07-eec9-d448-95d7-3a5591874d02@broadcom.com> Date: Tue, 4 Jul 2023 17:43:12 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20230704172817.02e4cdb8@xps-13> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230704_174316_979498_BC0E3C06 X-CRM114-Status: GOOD ( 23.73 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1593794891510785910==" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org --===============1593794891510785910== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000067c71605ffb2af18" --00000000000067c71605ffb2af18 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Hi Miquel, On 07/04/2023 08:28 AM, Miquel Raynal wrote: > Hi William, > > william.zhang@broadcom.com wrote on Tue, 27 Jun 2023 12:37:37 -0700: > >> 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") > > Wrong Fixes. Same here. The function write_oob_to_regs was added by this commit and no change since then. > > Missing Cc stable. Will add > >> 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 unsigned 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/raw/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_controller *ctrl, int i, >> const u8 *oob, int sas, int sector_1k) >> { >> int tbytes = sas << sector_1k; >> - int j; >> + int j, k = 0; >> + u32 last = 0xffffffff; >> + u8 *plast = (u8 *)&last; >> >> /* Adjust OOB values for 1K sector size */ >> if (sector_1k && (i & 0x01)) >> tbytes = max(0, tbytes - (int)ctrl->max_oob); >> tbytes = min_t(int, tbytes, ctrl->max_oob); >> >> - for (j = 0; j < tbytes; j += 4) >> + for (j = 0; (j + 3) < tbytes; j += 4) > > Maybe a comment here as well to mention that you stop at the last > iteration? Otherwise, just reading the line does not make you choice > obvious. > Will add comment. >> 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++] = oob[j++]; >> + >> + if (tbytes & 0x3) >> + oob_reg_write(ctrl, (tbytes & ~0x3), (__force u32)cpu_to_be32(last)); >> + >> return tbytes; >> } >> > > > Thanks, > Miquèl > --00000000000067c71605ffb2af18 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 gg3HMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT 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