From ee19387905650cab5da7dd97ada5502cd17ac93d Mon Sep 17 00:00:00 2001 From: Andres Morales Date: Tue, 5 Aug 2014 19:49:09 -0700 Subject: Erase PST partition if its marked to be erased. We need to wipe the challenges on this partition if OEM unlock is enabled, as this is a signal that the user has opted out of factory reset protection. go/factory-reset Bug: 16633064 Change-Id: Icb8f1433bf99ca57813f5b72d5a3dd15fa94a263 --- roots.cpp | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'roots.cpp') diff --git a/roots.cpp b/roots.cpp index 8f99019..61798f4 100644 --- a/roots.cpp +++ b/roots.cpp @@ -39,6 +39,8 @@ static struct fstab *fstab = NULL; extern struct selabel_handle *sehandle; +static const char* PERSISTENT_PATH = "/persistent"; + void load_volume_table() { int i; @@ -264,6 +266,41 @@ int format_volume(const char* volume) { return -1; } +int erase_persistent_partition() { + Volume *v = volume_for_path(PERSISTENT_PATH); + if (v == NULL) { + // most devices won't have /persistent, so this is not an error. + return 0; + } + + int fd = open(v->blk_device, O_RDWR); + uint64_t size = get_file_size(fd); + if (size == 0) { + LOGE("failed to stat size of /persistent\n"); + close(fd); + return -1; + } + + char oem_unlock_enabled; + lseek(fd, size - 1, SEEK_SET); + read(fd, &oem_unlock_enabled, 1); + + if (oem_unlock_enabled) { + if (wipe_block_device(fd, size)) { + LOGE("error wiping /persistent: %s\n", strerror(errno)); + close(fd); + return -1; + } + + lseek(fd, size - 1, SEEK_SET); + write(fd, &oem_unlock_enabled, 1); + } + + close(fd); + + return (int) oem_unlock_enabled; +} + int setup_install_mounts() { if (fstab == NULL) { LOGE("can't set up install mounts: no fstab loaded\n"); -- cgit v1.1