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Fri, 26 Apr 2024 22:56:01 +0000 (GMT) From: Stefan Berger To: keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net Cc: linux-kernel@vger.kernel.org, lukas@wunner.de, jarkko@kernel.org, Stefan Berger Subject: [PATCH] crypto: ecc - Protect ecc_digits_from_bytes from reading too many bytes Date: Fri, 26 Apr 2024 18:55:53 -0400 Message-ID: <20240426225553.3038070-1-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: K5i04VXHYMgKYT3Bmddfj1En5_l8n3IG X-Proofpoint-ORIG-GUID: K5i04VXHYMgKYT3Bmddfj1En5_l8n3IG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1011,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-04-26_20,2024-04-26_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 lowpriorityscore=0 mlxlogscore=999 adultscore=0 priorityscore=1501 impostorscore=0 spamscore=0 mlxscore=0 clxscore=1011 suspectscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2404010000 definitions=main-2404260162 Content-Type: text/plain; charset="utf-8" Protect ecc_digits_from_bytes from reading too many bytes from the input byte array in case an insufficient number of bytes is provided to fill the output digit array of ndigits. Therefore, initialize the most significant digits with 0 to avoid trying to read too many bytes later on. If too many bytes are provided on the input byte array the extra bytes are ignored since the input variable 'ndigits' limits the number of digits that will be filled. Fixes: d67c96fb97b5 ("crypto: ecdsa - Convert byte arrays with key coordina= tes to digits") Signed-off-by: Stefan Berger --- include/crypto/internal/ecc.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h index 7ca1f463d1ec..56215f14ff96 100644 --- a/include/crypto/internal/ecc.h +++ b/include/crypto/internal/ecc.h @@ -67,9 +67,16 @@ static inline void ecc_swap_digits(const void *in, u64 *= out, unsigned int ndigit static inline void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes, u64 *out, unsigned int ndigits) { + int diff =3D ndigits - DIV_ROUND_UP(nbytes, sizeof(u64)); unsigned int o =3D nbytes & 7; __be64 msd =3D 0; =20 + /* diff > 0: not enough input bytes: set most significant digits to 0 */ + while (diff > 0) { + out[--ndigits] =3D 0; + diff--; + } + if (o) { memcpy((u8 *)&msd + sizeof(msd) - o, in, o); out[--ndigits] =3D be64_to_cpu(msd); --=20 2.43.0