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Wed, 18 Jan 2023 17:11:08 +1100 (AEDT) From: Andrew Donnellan To: linuxppc-dev@lists.ozlabs.org, linux-integrity@vger.kernel.org Cc: gregkh@linuxfoundation.org, gcwilson@linux.ibm.com, linux-kernel@vger.kernel.org, nayna@linux.ibm.com, ruscur@russell.cc, zohar@linux.ibm.com, mpe@ellerman.id.au, gjoyce@linux.ibm.com, sudhakar@linux.ibm.com, bgray@linux.ibm.com, erichte@linux.ibm.com Subject: [PATCH v3 14/24] powerpc/pseries: Fix alignment of PLPKS structures and buffers Date: Wed, 18 Jan 2023 17:10:39 +1100 Message-Id: <20230118061049.1006141-15-ajd@linux.ibm.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230118061049.1006141-1-ajd@linux.ibm.com> References: <20230118061049.1006141-1-ajd@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: J--eV56EedY2BS737J_h7EWaJtBDCmEG X-Proofpoint-ORIG-GUID: J--eV56EedY2BS737J_h7EWaJtBDCmEG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.923,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-18_01,2023-01-17_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxlogscore=999 clxscore=1015 adultscore=0 priorityscore=1501 spamscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301180051 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org A number of structures and buffers passed to PKS hcalls have alignment requirements, which could on occasion cause problems: - Authorisation structures must be 16-byte aligned and must not cross a page boundary - Label structures must not cross page coundaries - Password output buffers must not cross page boundaries Round up the allocations of these structures/buffers to the next power of 2 to make sure this happens. Reported-by: Benjamin Gray Fixes: 2454a7af0f2a ("powerpc/pseries: define driver for Platform KeyStore") Signed-off-by: Andrew Donnellan Reviewed-by: Russell Currey Signed-off-by: Russell Currey --- v3: Merge plpks fixes and signed update series with secvar series --- arch/powerpc/platforms/pseries/plpks.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/platforms/pseries/plpks.c b/arch/powerpc/platforms/pseries/plpks.c index 6d1303e4862d..91f3f623a2c7 100644 --- a/arch/powerpc/platforms/pseries/plpks.c +++ b/arch/powerpc/platforms/pseries/plpks.c @@ -112,7 +112,8 @@ static int plpks_gen_password(void) u8 *password, consumer = PLPKS_OS_OWNER; int rc; - password = kzalloc(maxpwsize, GFP_KERNEL); + // The password must not cross a page boundary, so we align to the next power of 2 + password = kzalloc(roundup_pow_of_two(maxpwsize), GFP_KERNEL); if (!password) return -ENOMEM; @@ -148,7 +149,9 @@ static struct plpks_auth *construct_auth(u8 consumer) if (consumer > PLPKS_OS_OWNER) return ERR_PTR(-EINVAL); - auth = kzalloc(struct_size(auth, password, maxpwsize), GFP_KERNEL); + // The auth structure must not cross a page boundary and must be + // 16 byte aligned. We align to the next largest power of 2 + auth = kzalloc(roundup_pow_of_two(struct_size(auth, password, maxpwsize)), GFP_KERNEL); if (!auth) return ERR_PTR(-ENOMEM); @@ -182,7 +185,8 @@ static struct label *construct_label(char *component, u8 varos, u8 *name, if (component && slen > sizeof(label->attr.prefix)) return ERR_PTR(-EINVAL); - label = kzalloc(sizeof(*label), GFP_KERNEL); + // The label structure must not cross a page boundary, so we align to the next power of 2 + label = kzalloc(roundup_pow_of_two(sizeof(*label)), GFP_KERNEL); if (!label) return ERR_PTR(-ENOMEM);