21e7b2c4d5
If reply is ERR_PTR(...), then it should not be dereferenced, so I have moved the dereference from the declaration to after the IS_ERR test. The semantic match that finds the problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @match exists@ expression x, E; identifier fld; position p1,p2; @@ ( x = E; | x = E | x@p1->fld ... when != x = E IS_ERR(x@p2) ... when any ) @other_match exists@ expression match.x, E1, E2; position match.p1,match.p2; @@ x = E1 ... when != x = E2 when != x@p1 x@p2 @ script:python depends on !other_match@ p1 << match.p1; p2 << match.p2; @@ print "* file %s dereference %s test %s" % (p1[0].file,p1[0].line,p2[0].line) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
411 lines
12 KiB
C
411 lines
12 KiB
C
/*
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* linux/drivers/s390/crypto/zcrypt_pcica.c
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*
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* zcrypt 2.1.0
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*
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* Copyright (C) 2001, 2006 IBM Corporation
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* Author(s): Robert Burroughs
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* Eric Rossman (edrossma@us.ibm.com)
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*
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* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
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* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <asm/atomic.h>
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#include <asm/uaccess.h>
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#include "ap_bus.h"
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#include "zcrypt_api.h"
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#include "zcrypt_error.h"
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#include "zcrypt_pcica.h"
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#define PCICA_MIN_MOD_SIZE 1 /* 8 bits */
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#define PCICA_MAX_MOD_SIZE 256 /* 2048 bits */
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#define PCICA_SPEED_RATING 2800
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#define PCICA_MAX_MESSAGE_SIZE 0x3a0 /* sizeof(struct type4_lcr) */
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#define PCICA_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */
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#define PCICA_CLEANUP_TIME (15*HZ)
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static struct ap_device_id zcrypt_pcica_ids[] = {
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{ AP_DEVICE(AP_DEVICE_TYPE_PCICA) },
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{ /* end of list */ },
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};
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#ifndef CONFIG_ZCRYPT_MONOLITHIC
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MODULE_DEVICE_TABLE(ap, zcrypt_pcica_ids);
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("PCICA Cryptographic Coprocessor device driver, "
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"Copyright 2001, 2006 IBM Corporation");
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MODULE_LICENSE("GPL");
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#endif
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static int zcrypt_pcica_probe(struct ap_device *ap_dev);
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static void zcrypt_pcica_remove(struct ap_device *ap_dev);
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static void zcrypt_pcica_receive(struct ap_device *, struct ap_message *,
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struct ap_message *);
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static struct ap_driver zcrypt_pcica_driver = {
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.probe = zcrypt_pcica_probe,
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.remove = zcrypt_pcica_remove,
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.receive = zcrypt_pcica_receive,
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.ids = zcrypt_pcica_ids,
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.request_timeout = PCICA_CLEANUP_TIME,
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};
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/**
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* Convert a ICAMEX message to a type4 MEX message.
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*
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* @zdev: crypto device pointer
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* @zreq: crypto request pointer
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* @mex: pointer to user input data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int ICAMEX_msg_to_type4MEX_msg(struct zcrypt_device *zdev,
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struct ap_message *ap_msg,
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struct ica_rsa_modexpo *mex)
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{
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unsigned char *modulus, *exponent, *message;
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int mod_len;
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mod_len = mex->inputdatalength;
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if (mod_len <= 128) {
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struct type4_sme *sme = ap_msg->message;
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memset(sme, 0, sizeof(*sme));
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ap_msg->length = sizeof(*sme);
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sme->header.msg_fmt = TYPE4_SME_FMT;
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sme->header.msg_len = sizeof(*sme);
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sme->header.msg_type_code = TYPE4_TYPE_CODE;
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sme->header.request_code = TYPE4_REQU_CODE;
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modulus = sme->modulus + sizeof(sme->modulus) - mod_len;
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exponent = sme->exponent + sizeof(sme->exponent) - mod_len;
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message = sme->message + sizeof(sme->message) - mod_len;
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} else {
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struct type4_lme *lme = ap_msg->message;
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memset(lme, 0, sizeof(*lme));
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ap_msg->length = sizeof(*lme);
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lme->header.msg_fmt = TYPE4_LME_FMT;
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lme->header.msg_len = sizeof(*lme);
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lme->header.msg_type_code = TYPE4_TYPE_CODE;
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lme->header.request_code = TYPE4_REQU_CODE;
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modulus = lme->modulus + sizeof(lme->modulus) - mod_len;
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exponent = lme->exponent + sizeof(lme->exponent) - mod_len;
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message = lme->message + sizeof(lme->message) - mod_len;
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}
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if (copy_from_user(modulus, mex->n_modulus, mod_len) ||
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copy_from_user(exponent, mex->b_key, mod_len) ||
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copy_from_user(message, mex->inputdata, mod_len))
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return -EFAULT;
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return 0;
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}
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/**
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* Convert a ICACRT message to a type4 CRT message.
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*
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* @zdev: crypto device pointer
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* @zreq: crypto request pointer
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* @crt: pointer to user input data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int ICACRT_msg_to_type4CRT_msg(struct zcrypt_device *zdev,
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struct ap_message *ap_msg,
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struct ica_rsa_modexpo_crt *crt)
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{
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unsigned char *p, *q, *dp, *dq, *u, *inp;
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int mod_len, short_len, long_len;
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mod_len = crt->inputdatalength;
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short_len = mod_len / 2;
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long_len = mod_len / 2 + 8;
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if (mod_len <= 128) {
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struct type4_scr *scr = ap_msg->message;
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memset(scr, 0, sizeof(*scr));
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ap_msg->length = sizeof(*scr);
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scr->header.msg_type_code = TYPE4_TYPE_CODE;
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scr->header.request_code = TYPE4_REQU_CODE;
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scr->header.msg_fmt = TYPE4_SCR_FMT;
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scr->header.msg_len = sizeof(*scr);
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p = scr->p + sizeof(scr->p) - long_len;
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q = scr->q + sizeof(scr->q) - short_len;
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dp = scr->dp + sizeof(scr->dp) - long_len;
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dq = scr->dq + sizeof(scr->dq) - short_len;
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u = scr->u + sizeof(scr->u) - long_len;
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inp = scr->message + sizeof(scr->message) - mod_len;
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} else {
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struct type4_lcr *lcr = ap_msg->message;
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memset(lcr, 0, sizeof(*lcr));
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ap_msg->length = sizeof(*lcr);
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lcr->header.msg_type_code = TYPE4_TYPE_CODE;
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lcr->header.request_code = TYPE4_REQU_CODE;
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lcr->header.msg_fmt = TYPE4_LCR_FMT;
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lcr->header.msg_len = sizeof(*lcr);
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p = lcr->p + sizeof(lcr->p) - long_len;
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q = lcr->q + sizeof(lcr->q) - short_len;
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dp = lcr->dp + sizeof(lcr->dp) - long_len;
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dq = lcr->dq + sizeof(lcr->dq) - short_len;
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u = lcr->u + sizeof(lcr->u) - long_len;
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inp = lcr->message + sizeof(lcr->message) - mod_len;
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}
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if (copy_from_user(p, crt->np_prime, long_len) ||
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copy_from_user(q, crt->nq_prime, short_len) ||
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copy_from_user(dp, crt->bp_key, long_len) ||
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copy_from_user(dq, crt->bq_key, short_len) ||
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copy_from_user(u, crt->u_mult_inv, long_len) ||
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copy_from_user(inp, crt->inputdata, mod_len))
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return -EFAULT;
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return 0;
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}
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/**
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* Copy results from a type 84 reply message back to user space.
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*
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* @zdev: crypto device pointer
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* @reply: reply AP message.
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* @data: pointer to user output data
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* @length: size of user output data
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*
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* Returns 0 on success or -EFAULT.
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*/
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static int convert_type84(struct zcrypt_device *zdev,
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struct ap_message *reply,
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char __user *outputdata,
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unsigned int outputdatalength)
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{
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struct type84_hdr *t84h = reply->message;
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char *data;
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if (t84h->len < sizeof(*t84h) + outputdatalength) {
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/* The result is too short, the PCICA card may not do that.. */
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zdev->online = 0;
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return -EAGAIN; /* repeat the request on a different device. */
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}
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BUG_ON(t84h->len > PCICA_MAX_RESPONSE_SIZE);
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data = reply->message + t84h->len - outputdatalength;
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if (copy_to_user(outputdata, data, outputdatalength))
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return -EFAULT;
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return 0;
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}
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static int convert_response(struct zcrypt_device *zdev,
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struct ap_message *reply,
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char __user *outputdata,
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unsigned int outputdatalength)
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{
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/* Response type byte is the second byte in the response. */
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switch (((unsigned char *) reply->message)[1]) {
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case TYPE82_RSP_CODE:
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case TYPE88_RSP_CODE:
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return convert_error(zdev, reply);
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case TYPE84_RSP_CODE:
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return convert_type84(zdev, reply,
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outputdata, outputdatalength);
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default: /* Unknown response type, this should NEVER EVER happen */
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zdev->online = 0;
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return -EAGAIN; /* repeat the request on a different device. */
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}
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}
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/**
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* This function is called from the AP bus code after a crypto request
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* "msg" has finished with the reply message "reply".
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* It is called from tasklet context.
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* @ap_dev: pointer to the AP device
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* @msg: pointer to the AP message
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* @reply: pointer to the AP reply message
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*/
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static void zcrypt_pcica_receive(struct ap_device *ap_dev,
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struct ap_message *msg,
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struct ap_message *reply)
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{
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static struct error_hdr error_reply = {
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.type = TYPE82_RSP_CODE,
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.reply_code = REP82_ERROR_MACHINE_FAILURE,
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};
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struct type84_hdr *t84h;
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int length;
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/* Copy the reply message to the request message buffer. */
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if (IS_ERR(reply)) {
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memcpy(msg->message, &error_reply, sizeof(error_reply));
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goto out;
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}
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t84h = reply->message;
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if (t84h->code == TYPE84_RSP_CODE) {
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length = min(PCICA_MAX_RESPONSE_SIZE, (int) t84h->len);
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memcpy(msg->message, reply->message, length);
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} else
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memcpy(msg->message, reply->message, sizeof error_reply);
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out:
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complete((struct completion *) msg->private);
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}
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static atomic_t zcrypt_step = ATOMIC_INIT(0);
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/**
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* The request distributor calls this function if it picked the PCICA
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* device to handle a modexpo request.
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* @zdev: pointer to zcrypt_device structure that identifies the
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* PCICA device to the request distributor
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* @mex: pointer to the modexpo request buffer
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*/
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static long zcrypt_pcica_modexpo(struct zcrypt_device *zdev,
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struct ica_rsa_modexpo *mex)
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{
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struct ap_message ap_msg;
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struct completion work;
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int rc;
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ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL);
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if (!ap_msg.message)
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return -ENOMEM;
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ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
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atomic_inc_return(&zcrypt_step);
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ap_msg.private = &work;
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rc = ICAMEX_msg_to_type4MEX_msg(zdev, &ap_msg, mex);
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if (rc)
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goto out_free;
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init_completion(&work);
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ap_queue_message(zdev->ap_dev, &ap_msg);
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rc = wait_for_completion_interruptible(&work);
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if (rc == 0)
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rc = convert_response(zdev, &ap_msg, mex->outputdata,
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mex->outputdatalength);
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else
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/* Signal pending. */
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ap_cancel_message(zdev->ap_dev, &ap_msg);
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out_free:
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kfree(ap_msg.message);
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return rc;
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}
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/**
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* The request distributor calls this function if it picked the PCICA
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* device to handle a modexpo_crt request.
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* @zdev: pointer to zcrypt_device structure that identifies the
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* PCICA device to the request distributor
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* @crt: pointer to the modexpoc_crt request buffer
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*/
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static long zcrypt_pcica_modexpo_crt(struct zcrypt_device *zdev,
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struct ica_rsa_modexpo_crt *crt)
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{
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struct ap_message ap_msg;
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struct completion work;
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int rc;
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ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL);
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if (!ap_msg.message)
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return -ENOMEM;
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ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
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atomic_inc_return(&zcrypt_step);
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ap_msg.private = &work;
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rc = ICACRT_msg_to_type4CRT_msg(zdev, &ap_msg, crt);
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if (rc)
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goto out_free;
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init_completion(&work);
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ap_queue_message(zdev->ap_dev, &ap_msg);
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rc = wait_for_completion_interruptible(&work);
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if (rc == 0)
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rc = convert_response(zdev, &ap_msg, crt->outputdata,
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crt->outputdatalength);
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else
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/* Signal pending. */
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ap_cancel_message(zdev->ap_dev, &ap_msg);
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out_free:
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kfree(ap_msg.message);
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return rc;
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}
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/**
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* The crypto operations for a PCICA card.
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*/
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static struct zcrypt_ops zcrypt_pcica_ops = {
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.rsa_modexpo = zcrypt_pcica_modexpo,
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.rsa_modexpo_crt = zcrypt_pcica_modexpo_crt,
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};
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/**
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* Probe function for PCICA cards. It always accepts the AP device
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* since the bus_match already checked the hardware type.
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* @ap_dev: pointer to the AP device.
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*/
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static int zcrypt_pcica_probe(struct ap_device *ap_dev)
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{
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struct zcrypt_device *zdev;
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int rc;
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zdev = zcrypt_device_alloc(PCICA_MAX_RESPONSE_SIZE);
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if (!zdev)
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return -ENOMEM;
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zdev->ap_dev = ap_dev;
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zdev->ops = &zcrypt_pcica_ops;
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zdev->online = 1;
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zdev->user_space_type = ZCRYPT_PCICA;
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zdev->type_string = "PCICA";
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zdev->min_mod_size = PCICA_MIN_MOD_SIZE;
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zdev->max_mod_size = PCICA_MAX_MOD_SIZE;
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zdev->speed_rating = PCICA_SPEED_RATING;
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ap_dev->reply = &zdev->reply;
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ap_dev->private = zdev;
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rc = zcrypt_device_register(zdev);
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if (rc)
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goto out_free;
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return 0;
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out_free:
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ap_dev->private = NULL;
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zcrypt_device_free(zdev);
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return rc;
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}
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/**
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* This is called to remove the extended PCICA driver information
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* if an AP device is removed.
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*/
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static void zcrypt_pcica_remove(struct ap_device *ap_dev)
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{
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struct zcrypt_device *zdev = ap_dev->private;
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zcrypt_device_unregister(zdev);
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}
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int __init zcrypt_pcica_init(void)
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{
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return ap_driver_register(&zcrypt_pcica_driver, THIS_MODULE, "pcica");
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}
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void zcrypt_pcica_exit(void)
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{
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ap_driver_unregister(&zcrypt_pcica_driver);
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}
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#ifndef CONFIG_ZCRYPT_MONOLITHIC
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module_init(zcrypt_pcica_init);
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module_exit(zcrypt_pcica_exit);
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#endif
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