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Mon, 30 Sep 2024 13:20:42 +0000 (GMT) From: Steffen Eiden To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: Ingo Franzki , Harald Freudenberger , Christoph Schlameuss , Janosch Frank , Claudio Imbrenda Subject: [PATCH v1 2/2] s390/uv: Provide host-key hashes in sysfs Date: Mon, 30 Sep 2024 15:20:41 +0200 Message-ID: <20240930132042.2081982-3-seiden@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240930132042.2081982-1-seiden@linux.ibm.com> References: <20240930132042.2081982-1-seiden@linux.ibm.com> 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: ArgOT-_IxNjUL4DvJZMiSPARujOzK3_U X-Proofpoint-ORIG-GUID: ArgOT-_IxNjUL4DvJZMiSPARujOzK3_U X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-09-30_12,2024-09-30_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 clxscore=1015 suspectscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 spamscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409300095 Content-Type: text/plain; charset="utf-8" Utilize the new Query Ultravisor Keys to give user space the information which host-keys are installed on the system. Create a new sysfs directory 'firmware/uv/keys' that contains the hash of the host-key and the backup host-key of that system. Additionally, the file 'all' contains the response from the UVC possibly containing more key-hashes than currently known. Reviewed-by: Christoph Schlameuss Signed-off-by: Steffen Eiden --- arch/s390/include/asm/uv.h | 16 ++++++++ arch/s390/kernel/uv.c | 75 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 91 insertions(+) diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h index 153d93468b77..7eda73073cdd 100644 --- a/arch/s390/include/asm/uv.h +++ b/arch/s390/include/asm/uv.h @@ -31,6 +31,7 @@ #define UVC_RC_NEED_DESTROY 0x8000 =20 #define UVC_CMD_QUI 0x0001 +#define UVC_CMD_QUK 0x0002 #define UVC_CMD_INIT_UV 0x000f #define UVC_CMD_CREATE_SEC_CONF 0x0100 #define UVC_CMD_DESTROY_SEC_CONF 0x0101 @@ -94,6 +95,7 @@ enum uv_cmds_inst { BIT_UVC_CMD_ADD_SECRET =3D 29, BIT_UVC_CMD_LIST_SECRETS =3D 30, BIT_UVC_CMD_LOCK_SECRETS =3D 31, + BIT_UVC_CMD_QUERY_KEYS =3D 34, }; =20 enum uv_feat_ind { @@ -145,6 +147,20 @@ struct uv_cb_qui { u8 reserved112[0x120 - 0x112]; /* 0x0112 */ } __packed __aligned(8); =20 +struct uv_key_hash { + u64 dword[4]; +} __packed __aligned(8); + +#define UVC_QUERY_KEYS_IDX_HK 0 +#define UVC_QUERY_KEYS_IDX_BACK_HK 1 + +/* Query Ultravisor Keys */ +struct uv_cb_query_keys { + struct uv_cb_header header; /* 0x0000 */ + u64 reserved08[3]; /* 0x0008 */ + struct uv_key_hash keys[15]; /* 0x0020 */ +} __packed __aligned(8); + /* Initialize Ultravisor */ struct uv_cb_init { struct uv_cb_header header; diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index d703ecc9aea5..5496bceba275 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -721,10 +721,79 @@ static struct attribute *uv_query_attrs[] =3D { NULL, }; =20 +static inline struct uv_cb_query_keys uv_query_keys(void) +{ + struct uv_cb_query_keys uvcb =3D { + .header.cmd =3D UVC_CMD_QUK, + .header.len =3D sizeof(uvcb) + }; + + if (!test_bit_inv(BIT_UVC_CMD_QUERY_KEYS, uv_info.inst_calls_list)) + return uvcb; + + uv_call(0, (uint64_t)&uvcb); + return uvcb; +} + +static inline ssize_t emit_hash(struct uv_key_hash *hash, char *buf, int a= t) +{ + return sysfs_emit_at(buf, at, "%016llx%016llx%016llx%016llx\n", + hash->dword[0], hash->dword[1], hash->dword[2], hash->dword[3]); +} + +static ssize_t uv_keys_host_key(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct uv_cb_query_keys uvcb =3D uv_query_keys(); + + return emit_hash(&uvcb.keys[UVC_QUERY_KEYS_IDX_HK], buf, 0); +} + +static struct kobj_attribute uv_keys_host_key_attr =3D + __ATTR(host_key, 0444, uv_keys_host_key, NULL); + +static ssize_t uv_keys_backup_host_key(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct uv_cb_query_keys uvcb =3D uv_query_keys(); + + return emit_hash(&uvcb.keys[UVC_QUERY_KEYS_IDX_BACK_HK], buf, 0); +} + +static struct kobj_attribute uv_keys_backup_host_key_attr =3D + __ATTR(backup_host_key, 0444, uv_keys_backup_host_key, NULL); + +static ssize_t uv_keys_all(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct uv_cb_query_keys uvcb =3D uv_query_keys(); + ssize_t len =3D 0; + int i; + + for (i =3D 0; i < ARRAY_SIZE(uvcb.keys); i++) + len +=3D emit_hash(uvcb.keys + i, buf, len); + + return len; +} + +static struct kobj_attribute uv_keys_all_attr =3D + __ATTR(all, 0444, uv_keys_all, NULL); + static struct attribute_group uv_query_attr_group =3D { .attrs =3D uv_query_attrs, }; =20 +static struct attribute *uv_keys_attrs[] =3D { + &uv_keys_host_key_attr.attr, + &uv_keys_backup_host_key_attr.attr, + &uv_keys_all_attr.attr, + NULL, +}; + +static struct attribute_group uv_keys_attr_group =3D { + .attrs =3D uv_keys_attrs, +}; + static ssize_t uv_is_prot_virt_guest(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -750,6 +819,7 @@ static const struct attribute *uv_prot_virt_attrs[] =3D= { }; =20 static struct kset *uv_query_kset; +static struct kset *uv_keys_kset; static struct kobject *uv_kobj; =20 static int __init uv_sysfs_dir_init(const struct attribute_group *grp, @@ -789,6 +859,11 @@ static int __init uv_sysfs_init(void) rc =3D uv_sysfs_dir_init(&uv_query_attr_group, &uv_query_kset, "query"); if (rc) goto out_ind_files; + + // Get installed key hashes if available, ignore any errors + if (test_bit_inv(BIT_UVC_CMD_QUERY_KEYS, uv_info.inst_calls_list)) + uv_sysfs_dir_init(&uv_keys_attr_group, &uv_keys_kset, "keys"); + return 0; =20 out_ind_files: --=20 2.43.0