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otautil: Clean up SysUtil.cpp.

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Add unit testcases for sysMapFile().

Test: recovery_unit_test passes.
Test: Build and use the new recovery image to sideload a package.
Test: Build and use the new recovery image to install an update.

Change-Id: I77d8f1ea151ab513865d992c256ba93a1fcb51a4
This commit is contained in:
Tao Bao
2016-11-07 13:00:38 -08:00
parent ba41fba9e4
commit c3292f3fcb
4 changed files with 343 additions and 194 deletions
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otautil/SysUtil.cpp
+171 -166
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@@ -1,13 +1,25 @@
/*
* Copyright 2006 The Android Open Source Project
*
* System utilities.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SysUtil.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -16,197 +28,190 @@
#include <sys/types.h>
#include <unistd.h>
#include <android-base/logging.h>
#include <algorithm>
#include <string>
#include <vector>
#include "SysUtil.h"
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.h>
static bool sysMapFD(int fd, MemMapping* pMap) {
assert(pMap != NULL);
CHECK(pMap != nullptr);
struct stat sb;
if (fstat(fd, &sb) == -1) {
PLOG(ERROR) << "fstat(" << fd << ") failed";
return false;
}
struct stat sb;
if (fstat(fd, &sb) == -1) {
PLOG(ERROR) << "fstat(" << fd << ") failed";
return false;
}
void* memPtr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (memPtr == MAP_FAILED) {
PLOG(ERROR) << "mmap(" << sb.st_size << ", R, PRIVATE, " << fd << ", 0) failed";
return false;
}
void* memPtr = mmap(nullptr, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (memPtr == MAP_FAILED) {
PLOG(ERROR) << "mmap(" << sb.st_size << ", R, PRIVATE, " << fd << ", 0) failed";
return false;
}
pMap->addr = reinterpret_cast<unsigned char*>(memPtr);
pMap->length = sb.st_size;
pMap->range_count = 1;
pMap->ranges = reinterpret_cast<MappedRange*>(malloc(sizeof(MappedRange)));
if (pMap->ranges == NULL) {
PLOG(ERROR) << "malloc failed";
munmap(memPtr, sb.st_size);
return false;
}
pMap->ranges[0].addr = memPtr;
pMap->ranges[0].length = sb.st_size;
pMap->addr = static_cast<unsigned char*>(memPtr);
pMap->length = sb.st_size;
pMap->ranges.push_back({ memPtr, static_cast<size_t>(sb.st_size) });
return true;
return true;
}
static int sysMapBlockFile(FILE* mapf, MemMapping* pMap)
{
char block_dev[PATH_MAX+1];
size_t size;
unsigned int blksize;
size_t blocks;
unsigned int range_count;
unsigned int i;
// A "block map" which looks like this (from uncrypt/uncrypt.cpp):
//
// /dev/block/platform/msm_sdcc.1/by-name/userdata # block device
// 49652 4096 # file size in bytes, block size
// 3 # count of block ranges
// 1000 1008 # block range 0
// 2100 2102 # ... block range 1
// 30 33 # ... block range 2
//
// Each block range represents a half-open interval; the line "30 33"
// reprents the blocks [30, 31, 32].
static int sysMapBlockFile(const char* filename, MemMapping* pMap) {
CHECK(pMap != nullptr);
if (fgets(block_dev, sizeof(block_dev), mapf) == NULL) {
PLOG(ERROR) << "failed to read block device from header";
return -1;
}
for (i = 0; i < sizeof(block_dev); ++i) {
if (block_dev[i] == '\n') {
block_dev[i] = 0;
break;
}
}
std::string content;
if (!android::base::ReadFileToString(filename, &content)) {
PLOG(ERROR) << "Failed to read " << filename;
return -1;
}
if (fscanf(mapf, "%zu %u\n%u\n", &size, &blksize, &range_count) != 3) {
LOG(ERROR) << "failed to parse block map header";
return -1;
}
if (blksize != 0) {
blocks = ((size-1) / blksize) + 1;
}
if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0) {
LOG(ERROR) << "invalid data in block map file: size " << size << ", blksize " << blksize
<< ", range_count " << range_count;
return -1;
}
std::vector<std::string> lines = android::base::Split(android::base::Trim(content), "\n");
if (lines.size() < 4) {
LOG(ERROR) << "Block map file is too short: " << lines.size();
return -1;
}
pMap->range_count = range_count;
pMap->ranges = reinterpret_cast<MappedRange*>(calloc(range_count, sizeof(MappedRange)));
if (pMap->ranges == NULL) {
PLOG(ERROR) << "calloc(" << range_count << ", " << sizeof(MappedRange) << ") failed";
return -1;
}
size_t size;
unsigned int blksize;
if (sscanf(lines[1].c_str(), "%zu %u", &size, &blksize) != 2) {
LOG(ERROR) << "Failed to parse file size and block size: " << lines[1];
return -1;
}
// Reserve enough contiguous address space for the whole file.
unsigned char* reserve = reinterpret_cast<unsigned char*>(mmap64(NULL, blocks * blksize,
PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0));
if (reserve == MAP_FAILED) {
PLOG(ERROR) << "failed to reserve address space";
free(pMap->ranges);
return -1;
}
size_t range_count;
if (sscanf(lines[2].c_str(), "%zu", &range_count) != 1) {
LOG(ERROR) << "Failed to parse block map header: " << lines[2];
return -1;
}
int fd = open(block_dev, O_RDONLY);
if (fd < 0) {
PLOG(ERROR) << "failed to open block device " << block_dev;
munmap(reserve, blocks * blksize);
free(pMap->ranges);
return -1;
}
size_t blocks;
if (blksize != 0) {
blocks = ((size - 1) / blksize) + 1;
}
if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0 ||
lines.size() != 3 + range_count) {
LOG(ERROR) << "Invalid data in block map file: size " << size << ", blksize " << blksize
<< ", range_count " << range_count << ", lines " << lines.size();
return -1;
}
unsigned char* next = reserve;
size_t remaining_size = blocks * blksize;
bool success = true;
for (i = 0; i < range_count; ++i) {
size_t start, end;
if (fscanf(mapf, "%zu %zu\n", &start, &end) != 2) {
LOG(ERROR) << "failed to parse range " << i << " in block map";
success = false;
break;
}
size_t length = (end - start) * blksize;
if (end <= start || (end - start) > SIZE_MAX / blksize || length > remaining_size) {
LOG(ERROR) << "unexpected range in block map: " << start << " " << end;
success = false;
break;
}
// Reserve enough contiguous address space for the whole file.
void* reserve = mmap64(nullptr, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
if (reserve == MAP_FAILED) {
PLOG(ERROR) << "failed to reserve address space";
return -1;
}
void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize);
if (addr == MAP_FAILED) {
PLOG(ERROR) << "failed to map block " << i;
success = false;
break;
}
pMap->ranges[i].addr = addr;
pMap->ranges[i].length = length;
const std::string& block_dev = lines[0];
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(block_dev.c_str(), O_RDONLY)));
if (fd == -1) {
PLOG(ERROR) << "failed to open block device " << block_dev;
munmap(reserve, blocks * blksize);
return -1;
}
next += length;
remaining_size -= length;
}
if (success && remaining_size != 0) {
LOG(ERROR) << "ranges in block map are invalid: remaining_size = " << remaining_size;
pMap->ranges.resize(range_count);
unsigned char* next = static_cast<unsigned char*>(reserve);
size_t remaining_size = blocks * blksize;
bool success = true;
for (size_t i = 0; i < range_count; ++i) {
const std::string& line = lines[i + 3];
size_t start, end;
if (sscanf(line.c_str(), "%zu %zu\n", &start, &end) != 2) {
LOG(ERROR) << "failed to parse range " << i << " in block map: " << line;
success = false;
break;
}
if (!success) {
close(fd);
munmap(reserve, blocks * blksize);
free(pMap->ranges);
size_t length = (end - start) * blksize;
if (end <= start || (end - start) > SIZE_MAX / blksize || length > remaining_size) {
LOG(ERROR) << "unexpected range in block map: " << start << " " << end;
success = false;
break;
}
void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd,
static_cast<off64_t>(start) * blksize);
if (addr == MAP_FAILED) {
PLOG(ERROR) << "failed to map block " << i;
success = false;
break;
}
pMap->ranges[i].addr = addr;
pMap->ranges[i].length = length;
next += length;
remaining_size -= length;
}
if (success && remaining_size != 0) {
LOG(ERROR) << "ranges in block map are invalid: remaining_size = " << remaining_size;
success = false;
}
if (!success) {
munmap(reserve, blocks * blksize);
return -1;
}
pMap->addr = static_cast<unsigned char*>(reserve);
pMap->length = size;
LOG(INFO) << "mmapped " << range_count << " ranges";
return 0;
}
int sysMapFile(const char* fn, MemMapping* pMap) {
if (fn == nullptr || pMap == nullptr) {
LOG(ERROR) << "Invalid argument(s)";
return -1;
}
*pMap = {};
if (fn[0] == '@') {
if (sysMapBlockFile(fn + 1, pMap) != 0) {
LOG(ERROR) << "Map of '" << fn << "' failed";
return -1;
}
} else {
// This is a regular file.
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(fn, O_RDONLY)));
if (fd == -1) {
PLOG(ERROR) << "Unable to open '" << fn << "'";
return -1;
}
close(fd);
pMap->addr = reserve;
pMap->length = size;
LOG(INFO) << "mmapped " << range_count << " ranges";
return 0;
}
int sysMapFile(const char* fn, MemMapping* pMap)
{
memset(pMap, 0, sizeof(*pMap));
if (fn && fn[0] == '@') {
// A map of blocks
FILE* mapf = fopen(fn+1, "r");
if (mapf == NULL) {
PLOG(ERROR) << "Unable to open '" << (fn+1) << "'";
return -1;
}
if (sysMapBlockFile(mapf, pMap) != 0) {
LOG(ERROR) << "Map of '" << fn << "' failed";
fclose(mapf);
return -1;
}
fclose(mapf);
} else {
// This is a regular file.
int fd = open(fn, O_RDONLY);
if (fd == -1) {
PLOG(ERROR) << "Unable to open '" << fn << "'";
return -1;
}
if (!sysMapFD(fd, pMap)) {
LOG(ERROR) << "Map of '" << fn << "' failed";
close(fd);
return -1;
}
close(fd);
if (!sysMapFD(fd, pMap)) {
LOG(ERROR) << "Map of '" << fn << "' failed";
return -1;
}
return 0;
}
return 0;
}
/*
* Release a memory mapping.
*/
void sysReleaseMap(MemMapping* pMap)
{
int i;
for (i = 0; i < pMap->range_count; ++i) {
if (munmap(pMap->ranges[i].addr, pMap->ranges[i].length) < 0) {
PLOG(ERROR) << "munmap(" << pMap->ranges[i].addr << ", " << pMap->ranges[i].length
<< ") failed";
}
void sysReleaseMap(MemMapping* pMap) {
std::for_each(pMap->ranges.cbegin(), pMap->ranges.cend(), [](const MappedRange& range) {
if (munmap(range.addr, range.length) == -1) {
PLOG(ERROR) << "munmap(" << range.addr << ", " << range.length << ") failed";
}
free(pMap->ranges);
pMap->ranges = NULL;
pMap->range_count = 0;
});
pMap->ranges.clear();
}