75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
#include <malloc.h>
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#include <string.h>
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#include "utils.h"
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#include "magiskboot.h"
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static int check_verity_pattern(const char *s) {
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int skip = 0;
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if (s[0] == ',') ++skip;
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if (strncmp(s + skip, "verify", 6) == 0)
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skip += 6;
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else if (strncmp(s + skip, "avb", 3) == 0)
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skip += 3;
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else
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return -1;
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if (s[skip] == '=') {
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while (s[skip] != '\0' && s[skip] != ' ' && s[skip] != '\n' && s[skip] != ',') ++skip;
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}
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return skip;
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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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int patch_verity(void **buf, uint32_t *size, int patch) {
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int skip, src_size = *size, found = 0;
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char *src = *buf, *patched = patch ? xcalloc(src_size, 1) : NULL;
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for (int read = 0, write = 0; read < src_size; ++read, ++write) {
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if ((skip = check_verity_pattern(src + read)) > 0) {
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if (patch) {
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fprintf(stderr, "Remove pattern [%.*s]\n", skip, src + read);
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*size -= skip;
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} else {
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fprintf(stderr, "Found pattern [%.*s]\n", skip, src + read);
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}
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read += skip;
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found = 1;
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}
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if (patch)
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patched[write] = src[read];
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}
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if (patch) {
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free(*buf);
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*buf = patched;
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}
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return found;
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}
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void patch_encryption(void **buf, uint32_t *size) {
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int skip, src_size = *size;
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char *src = *buf, *patched = xcalloc(src_size, 1);
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for (int read = 0, write = 0; read < src_size; ++read, ++write) {
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if ((skip = check_encryption_pattern(src + read)) > 0) {
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fprintf(stderr, "Replace pattern [%.*s] with [encryptable]\n", skip, src + read);
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memcpy(patched + read, "encryptable", 11);
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read += skip;
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write += 11;
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*size -= (skip - 11);
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}
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patched[write] = src[read];
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}
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free(*buf);
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*buf = patched;
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}
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