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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 <stdio.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <cryptfs.h>
#include "edify/expr.h"
#include "bootloader.h"
Value* WriteBootloaderFn(const char* name, State* state, int argc, Expr* argv[])
{
int result = -1;
Value* img;
Value* xloader_loc;
Value* sbl_loc;
if (argc != 3) {
return ErrorAbort(state, "%s() expects 3 args, got %d", name, argc);
}
if (ReadValueArgs(state, argv, 3, &img, &xloader_loc, &sbl_loc) < 0) {
return NULL;
}
if(img->type != VAL_BLOB ||
xloader_loc->type != VAL_STRING ||
sbl_loc->type != VAL_STRING) {
FreeValue(img);
FreeValue(xloader_loc);
FreeValue(sbl_loc);
return ErrorAbort(state, "%s(): argument types are incorrect", name);
}
result = update_bootloader(img->data, img->size,
xloader_loc->data, sbl_loc->data);
FreeValue(img);
FreeValue(xloader_loc);
FreeValue(sbl_loc);
return StringValue(strdup(result == 0 ? "t" : ""));
}
/*
* The size of the userdata partition for HSPA Galaxy Nexus devices is incorrect
* in the partition as it comes from the factory. Updating the bootloader fixes
* the partition table, and makes the size of the userdata partition 1 sector
* smaller. However, if the user had encrypted their device with the original
* incorrect size of the partition table, the crypto footer has saved that
* size, and tries to map that much data when decrypting. However, with the
* new partition table, that size is too big to be mapped, and the kernel
* throws an error, and the user can't decrypt and boot the device after the
* OTA is installed. Oops!
*
* The fix here is to recognize a crypto footer that has the wrong size, and
* update it to the new correct size. This program should be run as part of
* the recovery script for HSPA Galaxy Nexus devices.
*/
#define BAD_SIZE 0x01b14fdfULL
#define GOOD_SIZE 0x01b14fdeULL
#define HSPA_PRIME_KEY_PARTITION "/dev/block/platform/omap/omap_hsmmc.0/by-name/metadata"
Value* FsSizeFixFn(const char* name, State* state, int argc, Expr* argv[])
{
struct crypt_mnt_ftr ftr;
int fd;
if (argc != 0) {
return ErrorAbort(state, "%s() expects 0 args, got %d", name, argc);
}
if ((fd = open(HSPA_PRIME_KEY_PARTITION, O_RDWR)) == -1) {
return ErrorAbort(state, "%s() Cannot open %s\n", name, HSPA_PRIME_KEY_PARTITION);
}
if (read(fd, &ftr, sizeof(ftr)) != sizeof(ftr)) {
close(fd);
return ErrorAbort(state, "%s() Cannot read crypto footer %s\n", name, HSPA_PRIME_KEY_PARTITION);
}
if ((ftr.magic == CRYPT_MNT_MAGIC) && (ftr.fs_size == BAD_SIZE)) {
ftr.fs_size = GOOD_SIZE;
if (lseek(fd, 0, SEEK_SET) == 0) {
if (write(fd, &ftr, sizeof(ftr)) == sizeof(ftr)) {
fsync(fd); /* Make sure it gets to the disk */
fprintf(stderr, "Footer updated\n");
close(fd);
return StringValue(strdup("t"));
}
}
close(fd);
return ErrorAbort(state, "%s() Cannot seek or write crypto footer %s\n", name, HSPA_PRIME_KEY_PARTITION);
}
/* Nothing to do */
fprintf(stderr, "Footer doesn't need updating\n");
close(fd);
return StringValue(strdup("t"));
}
void Register_librecovery_updater_tuna() {
fprintf(stderr, "installing samsung updater extensions\n");
RegisterFunction("samsung.write_bootloader", WriteBootloaderFn);
RegisterFunction("samsung.fs_size_fix", FsSizeFixFn);
}
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