452 lines
8.9 KiB
C
452 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* POWER LPAR Platform KeyStore(PLPKS)
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* Copyright (C) 2022 IBM Corporation
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* Author: Nayna Jain <nayna@linux.ibm.com>
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*
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* Provides access to variables stored in Power LPAR Platform KeyStore(PLPKS).
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*/
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#define pr_fmt(fmt) "plpks: " fmt
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <asm/hvcall.h>
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#include <asm/machdep.h>
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#include "plpks.h"
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static u8 *ospassword;
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static u16 ospasswordlength;
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// Retrieved with H_PKS_GET_CONFIG
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static u16 maxpwsize;
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static u16 maxobjsize;
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struct plpks_auth {
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u8 version;
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u8 consumer;
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__be64 rsvd0;
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__be32 rsvd1;
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__be16 passwordlength;
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u8 password[];
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} __packed __aligned(16);
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struct label_attr {
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u8 prefix[8];
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u8 version;
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u8 os;
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u8 length;
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u8 reserved[5];
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};
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struct label {
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struct label_attr attr;
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u8 name[PLPKS_MAX_NAME_SIZE];
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size_t size;
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};
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static int pseries_status_to_err(int rc)
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{
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int err;
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switch (rc) {
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case H_SUCCESS:
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err = 0;
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break;
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case H_FUNCTION:
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err = -ENXIO;
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break;
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case H_PARAMETER:
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case H_P2:
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case H_P3:
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case H_P4:
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case H_P5:
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case H_P6:
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err = -EINVAL;
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break;
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case H_NOT_FOUND:
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err = -ENOENT;
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break;
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case H_BUSY:
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err = -EBUSY;
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break;
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case H_AUTHORITY:
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err = -EPERM;
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break;
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case H_NO_MEM:
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err = -ENOMEM;
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break;
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case H_RESOURCE:
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err = -EEXIST;
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break;
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case H_TOO_BIG:
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err = -EFBIG;
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break;
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case H_STATE:
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err = -EIO;
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break;
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case H_R_STATE:
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err = -EIO;
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break;
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case H_IN_USE:
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err = -EEXIST;
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break;
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case H_ABORTED:
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err = -EIO;
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break;
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default:
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err = -EINVAL;
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}
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return err;
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}
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static int plpks_gen_password(void)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
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u8 *password, consumer = PLPKS_OS_OWNER;
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int rc;
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password = kzalloc(maxpwsize, GFP_KERNEL);
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if (!password)
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return -ENOMEM;
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rc = plpar_hcall(H_PKS_GEN_PASSWORD, retbuf, consumer, 0,
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virt_to_phys(password), maxpwsize);
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if (!rc) {
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ospasswordlength = maxpwsize;
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ospassword = kzalloc(maxpwsize, GFP_KERNEL);
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if (!ospassword) {
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kfree(password);
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return -ENOMEM;
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}
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memcpy(ospassword, password, ospasswordlength);
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} else {
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if (rc == H_IN_USE) {
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pr_warn("Password is already set for POWER LPAR Platform KeyStore\n");
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rc = 0;
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} else {
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goto out;
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}
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}
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out:
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kfree(password);
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return pseries_status_to_err(rc);
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}
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static struct plpks_auth *construct_auth(u8 consumer)
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{
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struct plpks_auth *auth;
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if (consumer > PLPKS_OS_OWNER)
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return ERR_PTR(-EINVAL);
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auth = kzalloc(struct_size(auth, password, maxpwsize), GFP_KERNEL);
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if (!auth)
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return ERR_PTR(-ENOMEM);
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auth->version = 1;
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auth->consumer = consumer;
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if (consumer == PLPKS_FW_OWNER || consumer == PLPKS_BOOTLOADER_OWNER)
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return auth;
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memcpy(auth->password, ospassword, ospasswordlength);
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auth->passwordlength = cpu_to_be16(ospasswordlength);
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return auth;
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}
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/**
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* Label is combination of label attributes + name.
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* Label attributes are used internally by kernel and not exposed to the user.
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*/
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static struct label *construct_label(char *component, u8 varos, u8 *name,
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u16 namelen)
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{
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struct label *label;
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size_t slen;
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if (!name || namelen > PLPKS_MAX_NAME_SIZE)
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return ERR_PTR(-EINVAL);
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slen = strlen(component);
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if (component && slen > sizeof(label->attr.prefix))
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return ERR_PTR(-EINVAL);
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label = kzalloc(sizeof(*label), GFP_KERNEL);
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if (!label)
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return ERR_PTR(-ENOMEM);
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if (component)
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memcpy(&label->attr.prefix, component, slen);
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label->attr.version = PLPKS_LABEL_VERSION;
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label->attr.os = varos;
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label->attr.length = PLPKS_MAX_LABEL_ATTR_SIZE;
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memcpy(&label->name, name, namelen);
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label->size = sizeof(struct label_attr) + namelen;
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return label;
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}
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static int _plpks_get_config(void)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
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struct {
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u8 version;
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u8 flags;
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__be32 rsvd0;
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__be16 maxpwsize;
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__be16 maxobjlabelsize;
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__be16 maxobjsize;
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__be32 totalsize;
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__be32 usedspace;
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__be32 supportedpolicies;
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__be64 rsvd1;
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} __packed config;
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size_t size;
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int rc;
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size = sizeof(config);
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rc = plpar_hcall(H_PKS_GET_CONFIG, retbuf, virt_to_phys(&config), size);
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if (rc != H_SUCCESS)
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return pseries_status_to_err(rc);
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maxpwsize = be16_to_cpu(config.maxpwsize);
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maxobjsize = be16_to_cpu(config.maxobjsize);
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return 0;
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}
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static int plpks_confirm_object_flushed(struct label *label,
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struct plpks_auth *auth)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
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u64 timeout = 0;
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u8 status;
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int rc;
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do {
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rc = plpar_hcall(H_PKS_CONFIRM_OBJECT_FLUSHED, retbuf,
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virt_to_phys(auth), virt_to_phys(label),
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label->size);
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status = retbuf[0];
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if (rc) {
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if (rc == H_NOT_FOUND && status == 1)
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rc = 0;
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break;
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}
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if (!rc && status == 1)
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break;
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fsleep(PLPKS_FLUSH_SLEEP);
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timeout = timeout + PLPKS_FLUSH_SLEEP;
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} while (timeout < PLPKS_MAX_TIMEOUT);
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rc = pseries_status_to_err(rc);
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return rc;
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}
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int plpks_write_var(struct plpks_var var)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
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struct plpks_auth *auth;
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struct label *label;
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int rc;
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if (!var.component || !var.data || var.datalen <= 0 ||
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var.namelen > PLPKS_MAX_NAME_SIZE || var.datalen > PLPKS_MAX_DATA_SIZE)
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return -EINVAL;
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if (var.policy & PLPKS_SIGNEDUPDATE)
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return -EINVAL;
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auth = construct_auth(PLPKS_OS_OWNER);
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if (IS_ERR(auth))
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return PTR_ERR(auth);
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label = construct_label(var.component, var.os, var.name, var.namelen);
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if (IS_ERR(label)) {
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rc = PTR_ERR(label);
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goto out;
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}
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rc = plpar_hcall(H_PKS_WRITE_OBJECT, retbuf, virt_to_phys(auth),
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virt_to_phys(label), label->size, var.policy,
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virt_to_phys(var.data), var.datalen);
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if (!rc)
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rc = plpks_confirm_object_flushed(label, auth);
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if (rc)
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pr_err("Failed to write variable %s for component %s with error %d\n",
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var.name, var.component, rc);
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rc = pseries_status_to_err(rc);
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kfree(label);
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out:
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kfree(auth);
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return rc;
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}
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int plpks_remove_var(char *component, u8 varos, struct plpks_var_name vname)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
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struct plpks_auth *auth;
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struct label *label;
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int rc;
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if (!component || vname.namelen > PLPKS_MAX_NAME_SIZE)
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return -EINVAL;
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auth = construct_auth(PLPKS_OS_OWNER);
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if (IS_ERR(auth))
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return PTR_ERR(auth);
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label = construct_label(component, varos, vname.name, vname.namelen);
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if (IS_ERR(label)) {
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rc = PTR_ERR(label);
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goto out;
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}
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rc = plpar_hcall(H_PKS_REMOVE_OBJECT, retbuf, virt_to_phys(auth),
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virt_to_phys(label), label->size);
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if (!rc)
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rc = plpks_confirm_object_flushed(label, auth);
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if (rc)
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pr_err("Failed to remove variable %s for component %s with error %d\n",
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vname.name, component, rc);
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rc = pseries_status_to_err(rc);
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kfree(label);
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out:
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kfree(auth);
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return rc;
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}
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static int plpks_read_var(u8 consumer, struct plpks_var *var)
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{
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE] = { 0 };
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struct plpks_auth *auth;
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struct label *label = NULL;
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u8 *output;
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int rc;
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if (var->namelen > PLPKS_MAX_NAME_SIZE)
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return -EINVAL;
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auth = construct_auth(consumer);
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if (IS_ERR(auth))
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return PTR_ERR(auth);
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if (consumer == PLPKS_OS_OWNER) {
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label = construct_label(var->component, var->os, var->name,
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var->namelen);
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if (IS_ERR(label)) {
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rc = PTR_ERR(label);
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goto out_free_auth;
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}
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}
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output = kzalloc(maxobjsize, GFP_KERNEL);
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if (!output) {
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rc = -ENOMEM;
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goto out_free_label;
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}
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if (consumer == PLPKS_OS_OWNER)
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rc = plpar_hcall(H_PKS_READ_OBJECT, retbuf, virt_to_phys(auth),
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virt_to_phys(label), label->size, virt_to_phys(output),
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maxobjsize);
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else
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rc = plpar_hcall(H_PKS_READ_OBJECT, retbuf, virt_to_phys(auth),
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virt_to_phys(var->name), var->namelen, virt_to_phys(output),
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maxobjsize);
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if (rc != H_SUCCESS) {
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pr_err("Failed to read variable %s for component %s with error %d\n",
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var->name, var->component, rc);
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rc = pseries_status_to_err(rc);
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goto out_free_output;
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}
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if (var->datalen == 0 || var->datalen > retbuf[0])
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var->datalen = retbuf[0];
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var->data = kzalloc(var->datalen, GFP_KERNEL);
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if (!var->data) {
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rc = -ENOMEM;
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goto out_free_output;
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}
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var->policy = retbuf[1];
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memcpy(var->data, output, var->datalen);
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rc = 0;
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out_free_output:
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kfree(output);
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out_free_label:
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kfree(label);
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out_free_auth:
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kfree(auth);
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return rc;
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}
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int plpks_read_os_var(struct plpks_var *var)
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{
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return plpks_read_var(PLPKS_OS_OWNER, var);
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}
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int plpks_read_fw_var(struct plpks_var *var)
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{
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return plpks_read_var(PLPKS_FW_OWNER, var);
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}
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int plpks_read_bootloader_var(struct plpks_var *var)
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{
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return plpks_read_var(PLPKS_BOOTLOADER_OWNER, var);
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}
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static __init int pseries_plpks_init(void)
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{
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int rc;
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rc = _plpks_get_config();
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if (rc) {
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pr_err("POWER LPAR Platform KeyStore is not supported or enabled\n");
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return rc;
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}
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rc = plpks_gen_password();
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if (rc)
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pr_err("Failed setting POWER LPAR Platform KeyStore Password\n");
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else
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pr_info("POWER LPAR Platform KeyStore initialized successfully\n");
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return rc;
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}
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machine_arch_initcall(pseries, pseries_plpks_init);
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