cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rtkit-crashlog.c (3912B)

      1// SPDX-License-Identifier: GPL-2.0-only OR MIT
      2/*
      3 * Apple RTKit IPC library
      4 * Copyright (C) The Asahi Linux Contributors
      5 */
      6#include "rtkit-internal.h"
      7
      8#define FOURCC(a, b, c, d) \
      9	(((u32)(a) << 24) | ((u32)(b) << 16) | ((u32)(c) << 8) | ((u32)(d)))
     10
     11#define APPLE_RTKIT_CRASHLOG_HEADER FOURCC('C', 'L', 'H', 'E')
     12#define APPLE_RTKIT_CRASHLOG_STR FOURCC('C', 's', 't', 'r')
     13#define APPLE_RTKIT_CRASHLOG_VERSION FOURCC('C', 'v', 'e', 'r')
     14#define APPLE_RTKIT_CRASHLOG_MBOX FOURCC('C', 'm', 'b', 'x')
     15#define APPLE_RTKIT_CRASHLOG_TIME FOURCC('C', 't', 'i', 'm')
     16
     17struct apple_rtkit_crashlog_header {
     18	u32 fourcc;
     19	u32 version;
     20	u32 size;
     21	u32 flags;
     22	u8 _unk[16];
     23};
     24static_assert(sizeof(struct apple_rtkit_crashlog_header) == 0x20);
     25
     26struct apple_rtkit_crashlog_mbox_entry {
     27	u64 msg0;
     28	u64 msg1;
     29	u32 timestamp;
     30	u8 _unk[4];
     31};
     32static_assert(sizeof(struct apple_rtkit_crashlog_mbox_entry) == 0x18);
     33
     34static void apple_rtkit_crashlog_dump_str(struct apple_rtkit *rtk, u8 *bfr,
     35					  size_t size)
     36{
     37	u32 idx;
     38	u8 *ptr, *end;
     39
     40	memcpy(&idx, bfr, 4);
     41
     42	ptr = bfr + 4;
     43	end = bfr + size;
     44	while (ptr < end) {
     45		u8 *newline = memchr(ptr, '\n', end - ptr);
     46
     47		if (newline) {
     48			u8 tmp = *newline;
     49			*newline = '\0';
     50			dev_warn(rtk->dev, "RTKit: Message (id=%x): %s\n", idx,
     51				 ptr);
     52			*newline = tmp;
     53			ptr = newline + 1;
     54		} else {
     55			dev_warn(rtk->dev, "RTKit: Message (id=%x): %s", idx,
     56				 ptr);
     57			break;
     58		}
     59	}
     60}
     61
     62static void apple_rtkit_crashlog_dump_version(struct apple_rtkit *rtk, u8 *bfr,
     63					      size_t size)
     64{
     65	dev_warn(rtk->dev, "RTKit: Version: %s", bfr + 16);
     66}
     67
     68static void apple_rtkit_crashlog_dump_time(struct apple_rtkit *rtk, u8 *bfr,
     69					   size_t size)
     70{
     71	u64 crash_time;
     72
     73	memcpy(&crash_time, bfr, 8);
     74	dev_warn(rtk->dev, "RTKit: Crash time: %lld", crash_time);
     75}
     76
     77static void apple_rtkit_crashlog_dump_mailbox(struct apple_rtkit *rtk, u8 *bfr,
     78					      size_t size)
     79{
     80	u32 type, index, i;
     81	size_t n_messages;
     82	struct apple_rtkit_crashlog_mbox_entry entry;
     83
     84	memcpy(&type, bfr + 16, 4);
     85	memcpy(&index, bfr + 24, 4);
     86	n_messages = (size - 28) / sizeof(entry);
     87
     88	dev_warn(rtk->dev, "RTKit: Mailbox history (type = %d, index = %d)",
     89		 type, index);
     90	for (i = 0; i < n_messages; ++i) {
     91		memcpy(&entry, bfr + 28 + i * sizeof(entry), sizeof(entry));
     92		dev_warn(rtk->dev, "RTKit:  #%03d@%08x: %016llx %016llx", i,
     93			 entry.timestamp, entry.msg0, entry.msg1);
     94	}
     95}
     96
     97void apple_rtkit_crashlog_dump(struct apple_rtkit *rtk, u8 *bfr, size_t size)
     98{
     99	size_t offset;
    100	u32 section_fourcc, section_size;
    101	struct apple_rtkit_crashlog_header header;
    102
    103	memcpy(&header, bfr, sizeof(header));
    104	if (header.fourcc != APPLE_RTKIT_CRASHLOG_HEADER) {
    105		dev_warn(rtk->dev, "RTKit: Expected crashlog header but got %x",
    106			 header.fourcc);
    107		return;
    108	}
    109
    110	if (header.size > size) {
    111		dev_warn(rtk->dev, "RTKit: Crashlog size (%x) is too large",
    112			 header.size);
    113		return;
    114	}
    115
    116	size = header.size;
    117	offset = sizeof(header);
    118
    119	while (offset < size) {
    120		memcpy(&section_fourcc, bfr + offset, 4);
    121		memcpy(&section_size, bfr + offset + 12, 4);
    122
    123		switch (section_fourcc) {
    124		case APPLE_RTKIT_CRASHLOG_HEADER:
    125			dev_dbg(rtk->dev, "RTKit: End of crashlog reached");
    126			return;
    127		case APPLE_RTKIT_CRASHLOG_STR:
    128			apple_rtkit_crashlog_dump_str(rtk, bfr + offset + 16,
    129						      section_size);
    130			break;
    131		case APPLE_RTKIT_CRASHLOG_VERSION:
    132			apple_rtkit_crashlog_dump_version(
    133				rtk, bfr + offset + 16, section_size);
    134			break;
    135		case APPLE_RTKIT_CRASHLOG_MBOX:
    136			apple_rtkit_crashlog_dump_mailbox(
    137				rtk, bfr + offset + 16, section_size);
    138			break;
    139		case APPLE_RTKIT_CRASHLOG_TIME:
    140			apple_rtkit_crashlog_dump_time(rtk, bfr + offset + 16,
    141						       section_size);
    142			break;
    143		default:
    144			dev_warn(rtk->dev,
    145				 "RTKit: Unknown crashlog section: %x",
    146				 section_fourcc);
    147		}
    148
    149		offset += section_size;
    150	}
    151
    152	dev_warn(rtk->dev,
    153		 "RTKit: End of crashlog reached but no footer present");
    154}