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Message-ID: <201806202248.zEM6vINs%fengguang.wu@intel.com>
Date: Wed, 20 Jun 2018 22:14:44 +0800
From: kbuild test robot <lkp@...el.com>
To: Ricardo Schwarzmeier <Ricardo.Schwarzmeier@...ineon.com>
Cc: kbuild-all@...org, linux-integrity@...r.kernel.org,
linux-kernel@...r.kernel.org, peterhuewe@....de,
jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca, arnd@...db.de,
gregkh@...uxfoundation.org,
Ricardo Schwarzmeier <Ricardo.Schwarzmeier@...ineon.com>
Subject: Re: [PATCH v2] tpm: Return the actual size when receiving an
unsupported command
Hi Ricardo,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on v4.18-rc1 next-20180620]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Ricardo-Schwarzmeier/tpm-Return-the-actual-size-when-receiving-an-unsupported-command/20180620-210928
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
>> drivers/char/tpm/tpm-interface.c:426:30: sparse: incorrect type in return expression (different base types) @@ expected long @@ got restricted __be32 [usertylong @@
drivers/char/tpm/tpm-interface.c:426:30: expected long
drivers/char/tpm/tpm-interface.c:426:30: got restricted __be32 [usertype] length
drivers/char/tpm/tpm-interface.c:565:34: sparse: expression using sizeof(void)
drivers/char/tpm/tpm-interface.c:565:34: sparse: expression using sizeof(void)
drivers/char/tpm/tpm-interface.c:1258:31: sparse: expression using sizeof(void)
vim +426 drivers/char/tpm/tpm-interface.c
401
402 static ssize_t tpm_try_transmit(struct tpm_chip *chip,
403 struct tpm_space *space,
404 u8 *buf, size_t bufsiz,
405 unsigned int flags)
406 {
407 struct tpm_output_header *header = (void *)buf;
408 int rc;
409 ssize_t len = 0;
410 u32 count, ordinal;
411 unsigned long stop;
412 bool need_locality;
413
414 rc = tpm_validate_command(chip, space, buf, bufsiz);
415 if (rc == -EINVAL)
416 return rc;
417 /*
418 * If the command is not implemented by the TPM, synthesize a
419 * response with a TPM2_RC_COMMAND_CODE return for user-space.
420 */
421 if (rc == -EOPNOTSUPP) {
422 header->length = cpu_to_be32(sizeof(*header));
423 header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
424 header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
425 TSS2_RESMGR_TPM_RC_LAYER);
> 426 return header->length;
427 }
428
429 if (bufsiz > TPM_BUFSIZE)
430 bufsiz = TPM_BUFSIZE;
431
432 count = be32_to_cpu(*((__be32 *) (buf + 2)));
433 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
434 if (count == 0)
435 return -ENODATA;
436 if (count > bufsiz) {
437 dev_err(&chip->dev,
438 "invalid count value %x %zx\n", count, bufsiz);
439 return -E2BIG;
440 }
441
442 if (!(flags & TPM_TRANSMIT_UNLOCKED))
443 mutex_lock(&chip->tpm_mutex);
444
445
446 if (chip->ops->clk_enable != NULL)
447 chip->ops->clk_enable(chip, true);
448
449 /* Store the decision as chip->locality will be changed. */
450 need_locality = chip->locality == -1;
451
452 if (!(flags & TPM_TRANSMIT_RAW) && need_locality) {
453 rc = tpm_request_locality(chip);
454 if (rc < 0)
455 goto out_no_locality;
456 }
457
458 if (chip->dev.parent)
459 pm_runtime_get_sync(chip->dev.parent);
460
461 rc = tpm2_prepare_space(chip, space, ordinal, buf);
462 if (rc)
463 goto out;
464
465 rc = chip->ops->send(chip, buf, count);
466 if (rc < 0) {
467 if (rc != -EPIPE)
468 dev_err(&chip->dev,
469 "%s: tpm_send: error %d\n", __func__, rc);
470 goto out;
471 }
472
473 if (chip->flags & TPM_CHIP_FLAG_IRQ)
474 goto out_recv;
475
476 if (chip->flags & TPM_CHIP_FLAG_TPM2)
477 stop = jiffies + tpm2_calc_ordinal_duration(chip, ordinal);
478 else
479 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
480 do {
481 u8 status = chip->ops->status(chip);
482 if ((status & chip->ops->req_complete_mask) ==
483 chip->ops->req_complete_val)
484 goto out_recv;
485
486 if (chip->ops->req_canceled(chip, status)) {
487 dev_err(&chip->dev, "Operation Canceled\n");
488 rc = -ECANCELED;
489 goto out;
490 }
491
492 tpm_msleep(TPM_TIMEOUT_POLL);
493 rmb();
494 } while (time_before(jiffies, stop));
495
496 chip->ops->cancel(chip);
497 dev_err(&chip->dev, "Operation Timed out\n");
498 rc = -ETIME;
499 goto out;
500
501 out_recv:
502 len = chip->ops->recv(chip, buf, bufsiz);
503 if (len < 0) {
504 rc = len;
505 dev_err(&chip->dev,
506 "tpm_transmit: tpm_recv: error %d\n", rc);
507 goto out;
508 } else if (len < TPM_HEADER_SIZE) {
509 rc = -EFAULT;
510 goto out;
511 }
512
513 if (len != be32_to_cpu(header->length)) {
514 rc = -EFAULT;
515 goto out;
516 }
517
518 rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
519
520 out:
521 if (chip->dev.parent)
522 pm_runtime_put_sync(chip->dev.parent);
523
524 if (need_locality)
525 tpm_relinquish_locality(chip);
526
527 out_no_locality:
528 if (chip->ops->clk_enable != NULL)
529 chip->ops->clk_enable(chip, false);
530
531 if (!(flags & TPM_TRANSMIT_UNLOCKED))
532 mutex_unlock(&chip->tpm_mutex);
533 return rc ? rc : len;
534 }
535
---
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