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b=TenQIEFjD7XXI24DiLx+HBQ6cofnagd5IBTnSF5dJlpY6DyCGp+HYmSlldlMk2EckehF v19tnA8k9XYDfEOy1aNtKpd08xob9vZLqWh6FLhHhJmSaYeFu6ofhZwwPu4eRmpObpFu 8jdNB1pZZ38ZjSEZnQts5BAq+IL1I2ePKaQtzj2AQADSON78381XBE7dE3E6WfcKvHlu m24ZOzWzlA/Kp00F//+b+uqLE4ZK9eLeeo3gNpF0RxaUob3xr2kmCKtIDt6oeX2DHJs6 zPWrMI1m4tUi/y6vPnI9iKs7PDywDT3WW5KbE+M3ylqu1iv9S3xgU05/ld2wf42NL791 TA== From: Ilya Leoshkevich To: Richard Henderson , David Hildenbrand , Cornelia Huck , Thomas Huth Subject: [PATCH v3 3/5] target/s390x: Fix cc_calc_sla_64() missing overflows Date: Wed, 12 Jan 2022 14:17:49 +0100 Message-Id: <20220112131751.226011-4-iii@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220112131751.226011-1-iii@linux.ibm.com> References: <20220112131751.226011-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: U4r1Q-HvwtaAqTUWjd6PAnRShXRaIIWa X-Proofpoint-GUID: l3kzWqo_lRkTL5Mccw94Pk4scJF1m-Co X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-01-12_04,2022-01-11_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 suspectscore=0 clxscore=1015 adultscore=0 mlxscore=0 phishscore=0 impostorscore=0 spamscore=0 mlxlogscore=999 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2201120086 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christian Borntraeger , qemu-s390x@nongnu.org, qemu-devel@nongnu.org, Ilya Leoshkevich Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1641997402998100001 Content-Type: text/plain; charset="utf-8" An overflow occurs for SLAG when at least one shifted bit is not equal to sign bit. Therefore, we need to check that `shift + 1` bits are neither all 0s nor all 1s. The current code checks only `shift` bits, missing some overflows. Fixes: cbe24bfa91d2 ("target-s390: Convert SHIFT, ROTATE SINGLE") Signed-off-by: Ilya Leoshkevich --- target/s390x/tcg/cc_helper.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/s390x/tcg/cc_helper.c b/target/s390x/tcg/cc_helper.c index c2c96c3a3c..b6acffa3e8 100644 --- a/target/s390x/tcg/cc_helper.c +++ b/target/s390x/tcg/cc_helper.c @@ -297,7 +297,8 @@ static uint32_t cc_calc_sla_32(uint32_t src, int shift) =20 static uint32_t cc_calc_sla_64(uint64_t src, int shift) { - uint64_t mask =3D ((1ULL << shift) - 1ULL) << (64 - shift); + /* Do not use (1ULL << (shift + 1)): it triggers UB when shift is 63. = */ + uint64_t mask =3D ((((1ULL << shift) - 1) << 1) + 1) << (64 - (shift += 1)); uint64_t sign =3D 1ULL << 63; uint64_t match; int64_t r; --=20 2.31.1