diff options
| -rw-r--r-- | adb/disable_verity_service.c | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/adb/disable_verity_service.c b/adb/disable_verity_service.c deleted file mode 100644 index ed3da52..0000000 --- a/adb/disable_verity_service.c +++ /dev/null @@ -1,199 +0,0 @@ -/* - * Copyright (C) 2014 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 "sysdeps.h" - -#define TRACE_TAG TRACE_ADB -#include "adb.h" - -#include <stdio.h> -#include <stdarg.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <inttypes.h> - -#include "cutils/properties.h" -#include "ext4_sb.h" -#include <fs_mgr.h> - -#define FSTAB_PREFIX "/fstab." -struct fstab *fstab; - -__attribute__((__format__(printf, 2, 3))) __nonnull((2)) -static void write_console(int fd, const char* format, ...) -{ - char buffer[256]; - va_list args; - va_start (args, format); - vsnprintf (buffer, sizeof(buffer), format, args); - va_end (args); - - adb_write(fd, buffer, strnlen(buffer, sizeof(buffer))); -} - -static int get_target_device_size(int fd, const char *blk_device, - uint64_t *device_size) -{ - int data_device; - struct ext4_super_block sb; - struct fs_info info; - - info.len = 0; /* Only len is set to 0 to ask the device for real size. */ - - data_device = adb_open(blk_device, O_RDONLY | O_CLOEXEC); - if (data_device < 0) { - write_console(fd, "Error opening block device (%s)\n", strerror(errno)); - return -1; - } - - if (lseek64(data_device, 1024, SEEK_SET) < 0) { - write_console(fd, "Error seeking to superblock\n"); - adb_close(data_device); - return -1; - } - - if (adb_read(data_device, &sb, sizeof(sb)) != sizeof(sb)) { - write_console(fd, "Error reading superblock\n"); - adb_close(data_device); - return -1; - } - - ext4_parse_sb(&sb, &info); - *device_size = info.len; - - adb_close(data_device); - return 0; -} - -static int disable_verity(int fd, const char *block_device, - const char* mount_point) -{ - uint32_t magic_number; - const uint32_t voff = VERITY_METADATA_MAGIC_DISABLE; - uint64_t device_length; - int device; - int retval = -1; - - device = adb_open(block_device, O_RDWR | O_CLOEXEC); - if (device == -1) { - write_console(fd, "Could not open block device %s (%s).\n", - block_device, strerror(errno)); - write_console(fd, "Maybe run adb remount?\n"); - goto errout; - } - - // find the start of the verity metadata - if (get_target_device_size(fd, (char*)block_device, &device_length) < 0) { - write_console(fd, "Could not get target device size.\n"); - goto errout; - } - - if (lseek64(device, device_length, SEEK_SET) < 0) { - write_console(fd, - "Could not seek to start of verity metadata block.\n"); - goto errout; - } - - // check the magic number - if (adb_read(device, &magic_number, sizeof(magic_number)) - != sizeof(magic_number)) { - write_console(fd, "Couldn't read magic number!\n"); - goto errout; - } - - if (magic_number == VERITY_METADATA_MAGIC_DISABLE) { - write_console(fd, "Verity already disabled on %s\n", mount_point); - goto errout; - } - - if (magic_number != VERITY_METADATA_MAGIC_NUMBER) { - write_console(fd, - "Couldn't find verity metadata at offset %"PRIu64"!\n", - device_length); - goto errout; - } - - if (lseek64(device, device_length, SEEK_SET) < 0) { - write_console(fd, - "Could not seek to start of verity metadata block.\n"); - goto errout; - } - - if (adb_write(device, &voff, sizeof(voff)) != sizeof(voff)) { - write_console(fd, "Could not set verity disabled flag on device %s\n", - block_device); - goto errout; - } - - write_console(fd, "Verity disabled on %s\n", mount_point); - retval = 0; -errout: - if (device != -1) - adb_close(device); - return retval; -} - -void disable_verity_service(int fd, void* cookie) -{ -#ifdef ALLOW_ADBD_DISABLE_VERITY - char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)]; - char propbuf[PROPERTY_VALUE_MAX]; - int i; - bool any_disabled = false; - - property_get("ro.secure", propbuf, "0"); - if (strcmp(propbuf, "1")) { - write_console(fd, "verity not enabled - ENG build\n"); - goto errout; - } - - property_get("ro.debuggable", propbuf, "0"); - if (strcmp(propbuf, "1")) { - write_console(fd, "verity cannot be disabled - USER build\n"); - goto errout; - } - - property_get("ro.hardware", propbuf, ""); - snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf); - - fstab = fs_mgr_read_fstab(fstab_filename); - if (!fstab) { - write_console(fd, "Failed to open %s\nMaybe run adb root?\n", - fstab_filename); - goto errout; - } - - /* Loop through entries looking for ones that vold manages */ - for (i = 0; i < fstab->num_entries; i++) { - if(fs_mgr_is_verified(&fstab->recs[i])) { - if (!disable_verity(fd, fstab->recs[i].blk_device, - fstab->recs[i].mount_point)) { - any_disabled = true; - } - } - } - - if (any_disabled) { - write_console(fd, - "Now reboot your device for settings to take effect\n"); - } -#else - write_console(fd, "disable-verity only works for userdebug builds\n"); -#endif - -errout: - adb_close(fd); -} |