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Hook dex2oat functions to remove LSPosed traces
We use the env LD_PRELOAD to hook the execution of `dex2oat`, which can be directly set to be a file descriptor.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,6 @@ | ||
| #pragma once | ||
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| #include <errno.h> | ||
| #include <android/log.h> | ||
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| #ifndef LOG_TAG | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| #include <dlfcn.h> | ||
| #include <stdint.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
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| #include "logging.h" | ||
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| static uint32_t (*OatHeader_GetKeyValueStoreSize)(void*); | ||
| static uint8_t* (*OatHeader_GetKeyValueStore)(void*); | ||
| static bool store_updated = false; | ||
| const char* parameter_to_remove = " --inline-max-code-units=0"; | ||
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| typedef struct { | ||
| char* key; | ||
| char* value; | ||
| } KeyValuePair; | ||
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| void UpdateKeyValueStore(KeyValuePair* key_value, uint8_t* store) { | ||
| char* data_ptr = (char*)store; | ||
| while (key_value != NULL && key_value->key != NULL) { | ||
| strcpy(data_ptr, key_value->key); | ||
| data_ptr += strlen(key_value->key) + 1; | ||
| strcpy(data_ptr, key_value->value); | ||
| data_ptr += strlen(key_value->value) + 1; | ||
| key_value++; | ||
| } | ||
| LOGD("KeyValueStore updated"); | ||
| store_updated = true; | ||
| } | ||
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| __attribute__((visibility("default"))) uint8_t* _ZNK3art9OatHeader16GetKeyValueStoreEv( | ||
| void* header) { | ||
| LOGD("OatHeader::GetKeyValueStore() called on object at %p\n", header); | ||
| uint8_t* key_value_store_ = OatHeader_GetKeyValueStore(header); | ||
| uint32_t key_value_store_size_ = OatHeader_GetKeyValueStoreSize(header); | ||
| const char* ptr = (const char*)(key_value_store_); | ||
| const char* end = ptr + key_value_store_size_; | ||
| LOGD("store: %p, size: %d", key_value_store_, key_value_store_size_); | ||
| KeyValuePair* new_store = NULL; | ||
| int new_store_count = 0; | ||
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| while (ptr < end) { | ||
| // Scan for a closing zero. | ||
| const char* key_end = (const char*)(memchr(ptr, '\0', end - ptr)); | ||
| if (!key_end) { | ||
| LOGE("no key_end scanned"); | ||
| return key_value_store_; | ||
| } | ||
| char* key = strndup(ptr, key_end - ptr); | ||
| const char* value_start = key_end + 1; | ||
| const char* value_end = (const char*)(memchr(value_start, '\0', end - value_start)); | ||
| if (!value_end) { | ||
| LOGE("no value_end scanned"); | ||
| return key_value_store_; | ||
| } | ||
| char* value = strndup(value_start, value_end - value_start); | ||
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| // Clean the value if the key is "dex2oat-cmdline" | ||
| if (strcmp(key, "dex2oat-cmdline") == 0) { | ||
| size_t len = strlen(value) - strlen(parameter_to_remove); | ||
| char* new_value = (char*)malloc(len + 1); | ||
| strncpy(new_value, value, len); | ||
| new_value[len] = '\0'; | ||
| free(value); | ||
| value = new_value; | ||
| } | ||
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| new_store_count++; | ||
| new_store = (KeyValuePair*)realloc(new_store, sizeof(KeyValuePair) * new_store_count); | ||
| new_store[new_store_count - 1].key = key; | ||
| new_store[new_store_count - 1].value = value; | ||
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| // Advance over the value. | ||
| ptr = value_end + 1; | ||
| } | ||
| UpdateKeyValueStore(new_store, key_value_store_); | ||
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| // Free allocated memory | ||
| for (int i = 0; i < new_store_count; i++) { | ||
| free(new_store[i].key); | ||
| free(new_store[i].value); | ||
| } | ||
| free(new_store); | ||
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| return key_value_store_; | ||
| } | ||
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| __attribute__((visibility("default"))) uint32_t | ||
| _ZNK3art9OatHeader20GetKeyValueStoreSizeEv(void* header) { | ||
| uint32_t size = OatHeader_GetKeyValueStoreSize(header); | ||
| if (store_updated) { | ||
| LOGD("OatHeader::GetKeyValueStoreSize() called on object at %p\n", header); | ||
| size -= strlen(parameter_to_remove); | ||
| } | ||
| return size; | ||
| } | ||
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| __attribute__((constructor)) static void initialize() { | ||
| if (!OatHeader_GetKeyValueStore) { | ||
| OatHeader_GetKeyValueStore = dlsym(RTLD_NEXT, "_ZNK3art9OatHeader16GetKeyValueStoreEv"); | ||
| if (!OatHeader_GetKeyValueStore) { | ||
| LOGE("Error resolving symbol: _ZNK3art9OatHeader16GetKeyValueStoreEv"); | ||
| exit(1); | ||
| } | ||
| } | ||
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| if (!OatHeader_GetKeyValueStoreSize) { | ||
| OatHeader_GetKeyValueStoreSize = | ||
| dlsym(RTLD_NEXT, "_ZNK3art9OatHeader20GetKeyValueStoreSizeEv"); | ||
| if (!OatHeader_GetKeyValueStoreSize) { | ||
| LOGE("Error resolving symbol: _ZNK3art9OatHeader20GetKeyValueStoreSizeEv"); | ||
| exit(1); | ||
| } | ||
| } | ||
| } |
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