| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2012 IBM Corporation |
| 3 | * |
| 4 | * Author: Ashley Lai <ashleydlai@gmail.com> |
| 5 | * |
| 6 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
| 7 | * |
| 8 | * Read the event log created by the firmware on PPC64 |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/of.h> |
| 19 | |
| 20 | #include "tpm.h" |
| 21 | #include "tpm_eventlog.h" |
| 22 | |
| 23 | int read_log(struct tpm_bios_log *log) |
| 24 | { |
| 25 | struct device_node *np; |
| 26 | const u32 *sizep; |
| 27 | const u64 *basep; |
| 28 | |
| 29 | if (log->bios_event_log != NULL) { |
| 30 | pr_err("%s: ERROR - Eventlog already initialized\n", __func__); |
| 31 | return -EFAULT; |
| 32 | } |
| 33 | |
| 34 | np = of_find_node_by_name(NULL, "vtpm"); |
| 35 | if (!np) { |
| 36 | pr_err("%s: ERROR - IBMVTPM not supported\n", __func__); |
| 37 | return -ENODEV; |
| 38 | } |
| 39 | |
| 40 | sizep = of_get_property(np, "linux,sml-size", NULL); |
| 41 | if (sizep == NULL) { |
| 42 | pr_err("%s: ERROR - SML size not found\n", __func__); |
| 43 | goto cleanup_eio; |
| 44 | } |
| 45 | if (*sizep == 0) { |
| 46 | pr_err("%s: ERROR - event log area empty\n", __func__); |
| 47 | goto cleanup_eio; |
| 48 | } |
| 49 | |
| 50 | basep = of_get_property(np, "linux,sml-base", NULL); |
| 51 | if (basep == NULL) { |
| 52 | pr_err("%s: ERROR - SML not found\n", __func__); |
| 53 | goto cleanup_eio; |
| 54 | } |
| 55 | |
| 56 | log->bios_event_log = kmalloc(*sizep, GFP_KERNEL); |
| 57 | if (!log->bios_event_log) { |
| 58 | pr_err("%s: ERROR - Not enough memory for BIOS measurements\n", |
| 59 | __func__); |
| 60 | of_node_put(np); |
| 61 | return -ENOMEM; |
| 62 | } |
| 63 | |
| 64 | log->bios_event_log_end = log->bios_event_log + *sizep; |
| 65 | |
| 66 | memcpy(log->bios_event_log, __va(*basep), *sizep); |
| 67 | of_node_put(np); |
| 68 | |
| 69 | return 0; |
| 70 | |
| 71 | cleanup_eio: |
| 72 | of_node_put(np); |
| 73 | return -EIO; |
| 74 | } |