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Support multiple CPIO concatenated

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topjohnwu 2022-03-13 04:23:00 -07:00
parent cc6ca0bda2
commit 9b60c005c7
1 changed files with 14 additions and 5 deletions
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19
native/jni/magiskboot/cpio.cpp
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@ -210,16 +210,25 @@ bool cpio::mv(const char *from, const char *to) {
void cpio::load_cpio(const char *buf, size_t sz) {
size_t pos = 0;
while (pos < sz) {
auto header = reinterpret_cast<const cpio_newc_header *>(buf + pos);
auto hdr = reinterpret_cast<const cpio_newc_header *>(buf + pos);
if (memcmp(hdr->magic, "070701", 6) != 0)
LOGE("bad cpio header\n");
pos += sizeof(cpio_newc_header);
string_view name(buf + pos);
pos += x8u(header->namesize);
pos += x8u(hdr->namesize);
pos_align(pos);
if (name == "." || name == "..")
continue;
if (name == "TRAILER!!!")
break;
auto entry = new cpio_entry(header);
if (name == "TRAILER!!!") {
// Android support multiple CPIO being concatenated
// Search for the next cpio header
auto next = static_cast<const char *>(memmem(buf + pos, sz - pos, "070701", 6));
if (next == nullptr)
break;
pos = next - buf;
continue;
}
auto entry = new cpio_entry(hdr);
entry->data = xmalloc(entry->filesize);
memcpy(entry->data, buf + pos, entry->filesize);
pos += entry->filesize;