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Support patching DTB/DTBO partition format

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This commit is contained in:
topjohnwu
2019-12-02 04:34:21 -05:00
parent 72edbfc455
commit 8d21988656
3 changed files with 174 additions and 108 deletions
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18
native/jni/magiskboot/pattern.cpp
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@@ -16,13 +16,14 @@ static int check_verity_pattern(const char *s) {
return -1;
if (s[skip] == '=') {
while (s[skip] != '\0' && s[skip] != ' ' && s[skip] != '\n' && s[skip] != ',') ++skip;
while (s[skip] != '\0' && s[skip] != ' ' && s[skip] != '\n' && s[skip] != ',')
++skip;
}
return skip;
}
static int check_encryption_pattern(const char *s) {
static const char *encrypt_list[] = { "forceencrypt", "forcefdeorfbe" };
constexpr const char *encrypt_list[] = { "forceencrypt", "forcefdeorfbe" };
for (auto enc : encrypt_list) {
int len = strlen(enc);
if (strncmp(s, enc, len) == 0)
@@ -33,26 +34,27 @@ static int check_encryption_pattern(const char *s) {
char *patch_verity(const void *buf, uint32_t &size, bool inplace) {
auto src = static_cast<const char *>(buf);
auto dest = (char *)(inplace ? buf : xmalloc(size));
int src_size = size;
bool found = false;
auto patched = (char *)(inplace ? buf : xmalloc(size));
int write = 0;
for (int read = 0; read < src_size; ++read, ++write) {
for (int read = 0; read < src_size;) {
if (int skip; (skip = check_verity_pattern(src + read)) > 0) {
fprintf(stderr, "Found pattern [%.*s]\n", skip, src + read);
size -= skip;
read += skip;
found = true;
} else {
dest[write++] = src[read++];
}
patched[write] = src[read];
}
patched[write] = '\0';
dest[write] = '\0';
if (!found) {
if (!inplace)
free(patched);
free(dest);
return nullptr;
}
return patched;
return dest;
}
void patch_encryption(void *buf, uint32_t &size) {