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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 08/24] powerpc/secvar: Allow backend to populate static list of variable names Date: Wed, 18 Jan 2023 17:10:33 +1100 Message-Id: <20230118061049.1006141-9-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: zVPVTZzltHGxRihbg8CIp5WqLNp44g_V X-Proofpoint-ORIG-GUID: zVPVTZzltHGxRihbg8CIp5WqLNp44g_V 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 lowpriorityscore=0 suspectscore=0 mlxscore=0 phishscore=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 spamscore=0 mlxlogscore=999 bulkscore=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 Currently, the list of variables is populated by calling secvar_ops->get_next() repeatedly, which is explicitly modelled on the OPAL API (including the keylen parameter). For the upcoming PLPKS backend, we have a static list of variable names. It is messy to fit that into get_next(), so instead, let the backend put a NULL-terminated array of variable names into secvar_ops->var_names, which will be used if get_next() is undefined. Signed-off-by: Andrew Donnellan Signed-off-by: Russell Currey --- v3: New patch (ajd/mpe) --- arch/powerpc/include/asm/secvar.h | 4 ++ arch/powerpc/kernel/secvar-sysfs.c | 67 ++++++++++++++++++++---------- 2 files changed, 50 insertions(+), 21 deletions(-) diff --git a/arch/powerpc/include/asm/secvar.h b/arch/powerpc/include/asm/secvar.h index ebf95386d720..c8bee1834b54 100644 --- a/arch/powerpc/include/asm/secvar.h +++ b/arch/powerpc/include/asm/secvar.h @@ -23,6 +23,10 @@ struct secvar_operations { ssize_t (*format)(char *buf); int (*max_size)(u64 *max_size); const struct attribute **config_attrs; + + // NULL-terminated array of fixed variable names + // Only used if get_next() isn't provided + const char * const *var_names; }; #ifdef CONFIG_PPC_SECURE_BOOT diff --git a/arch/powerpc/kernel/secvar-sysfs.c b/arch/powerpc/kernel/secvar-sysfs.c index b82e95a2e415..d9352d4be87b 100644 --- a/arch/powerpc/kernel/secvar-sysfs.c +++ b/arch/powerpc/kernel/secvar-sysfs.c @@ -153,9 +153,31 @@ static int secvar_sysfs_config(struct kobject *kobj) return 0; } -static int secvar_sysfs_load(void) +static int add_var(const char *name) { struct kobject *kobj; + int rc; + + kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); + if (!kobj) + return -ENOMEM; + + kobject_init(kobj, &secvar_ktype); + + rc = kobject_add(kobj, &secvar_kset->kobj, "%s", name); + if (rc) { + pr_warn("kobject_add error %d for attribute: %s\n", rc, + name); + kobject_put(kobj); + return rc; + } + + kobject_uevent(kobj, KOBJ_ADD); + return 0; +} + +static int secvar_sysfs_load(void) +{ u64 namesize = 0; char *name; int rc; @@ -173,31 +195,26 @@ static int secvar_sysfs_load(void) break; } - kobj = kzalloc(sizeof(*kobj), GFP_KERNEL); - if (!kobj) { - rc = -ENOMEM; - break; - } - - kobject_init(kobj, &secvar_ktype); - - rc = kobject_add(kobj, &secvar_kset->kobj, "%s", name); - if (rc) { - pr_warn("kobject_add error %d for attribute: %s\n", rc, - name); - kobject_put(kobj); - kobj = NULL; - } - - if (kobj) - kobject_uevent(kobj, KOBJ_ADD); - + rc = add_var(name); } while (!rc); kfree(name); return rc; } +static int secvar_sysfs_load_static(void) +{ + const char * const *name_ptr = secvar_ops->var_names; + int rc; + while (*name_ptr) { + rc = add_var(*name_ptr); + if (rc) + return rc; + name_ptr++; + } + return 0; +} + static int secvar_sysfs_init(void) { int rc; @@ -239,7 +256,15 @@ static int secvar_sysfs_init(void) goto err; } - secvar_sysfs_load(); + if (secvar_ops->get_next) + rc = secvar_sysfs_load(); + else + rc = secvar_sysfs_load_static(); + + if (rc) { + pr_err("Failed to create variable attributes\n"); + goto err; + } return 0; err: