93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
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#include <malloc.h>
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#include <string.h>
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#include "utils.h"
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static int check_verity_pattern(const char *s) {
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int pos = 0;
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if (s[0] == ',') ++pos;
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if (strncmp(s + pos, "verify", 6) == 0)
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pos += 6;
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else if (strncmp(s + pos, "avb", 3) == 0)
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pos += 3;
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else
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return -1;
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if (s[pos] == '=') {
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while (s[pos] != '\0' && s[pos] != ' ' && s[pos] != '\n' && s[pos] != ',') ++pos;
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}
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return pos;
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}
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static int check_encryption_pattern(const char *s) {
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const char *encrypt_list[] = { "forceencrypt", "forcefdeorfbe", NULL };
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for (int i = 0 ; encrypt_list[i]; ++i) {
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int len = strlen(encrypt_list[i]);
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if (strncmp(s, encrypt_list[i], len) == 0)
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return len;
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}
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return -1;
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}
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void patch_init_rc(void **buf, size_t *size) {
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int injected = 0;
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char *new_data = malloc(*size + 23);
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char *old_data = *buf;
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size_t pos = 0;
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for (char *tok = strsep(&old_data, "\n"); tok; tok = strsep(&old_data, "\n")) {
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if (!injected && strncmp(tok, "import", 6) == 0) {
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if (strstr(tok, "init.magisk.rc")) {
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injected = 1;
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} else {
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strcpy(new_data + pos, "import /init.magisk.rc\n");
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pos += 23;
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injected = 1;
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}
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} else if (strstr(tok, "selinux.reload_policy")) {
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continue;
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}
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// Copy the line
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strcpy(new_data + pos, tok);
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pos += strlen(tok);
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new_data[pos++] = '\n';
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}
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free(*buf);
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*size = pos;
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*buf = new_data;
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}
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int patch_verity(char **buf, uint32_t *size, int patch) {
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int skip, found = 0;
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for (int pos = 0; pos < *size; ++pos) {
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if ((skip = check_verity_pattern(*buf + pos)) > 0) {
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found = 1;
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fprintf(stderr, "%s pattern [%.*s]\n", patch ? "Remove" : "Found", skip, *buf + pos);
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if (patch) {
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memcpy(*buf + pos, *buf + pos + skip, *size - pos - skip);
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memset(*buf + *size - skip, '\0', skip);
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*size -= skip;
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} else {
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pos += skip - 1;
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}
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}
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}
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return found;
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}
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void patch_encryption(char **buf, uint32_t *size) {
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int skip;
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for (int pos = 0; pos < *size; ++pos) {
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if ((skip = check_encryption_pattern(*buf + pos)) > 0) {
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fprintf(stderr, "Replace pattern [%.*s] with [encryptable]\n", skip, *buf + pos);
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memcpy(*buf + pos, "encryptable", 11);
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memcpy(*buf + pos + 11, *buf + pos + skip, *size - pos - skip);
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memset(*buf + *size - skip + 11, '\0', skip - 11);
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*size -= (skip - 11);
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}
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}
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}
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