forked from MarcoBuster/Magisk
64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
#include <malloc.h>
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#include <string.h>
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#include <utils.hpp>
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#include "magiskboot.hpp"
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#define CHECKED_MATCH(p) else if (strncmp(s + skip, p, sizeof(p) - 1) == 0) skip += (sizeof(p) - 1)
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static int check_verity_pattern(const char *s) {
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int skip = s[0] == ',';
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if (0) {}
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CHECKED_MATCH("verifyatboot");
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CHECKED_MATCH("verify");
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CHECKED_MATCH("avb_keys");
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CHECKED_MATCH("avb");
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CHECKED_MATCH("support_scfs");
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CHECKED_MATCH("fsverity");
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else return -1;
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if (s[skip] == '=') {
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while (s[skip] != '\0' && s[skip] != ' ' && s[skip] != '\n' && s[skip] != ',')
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++skip;
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}
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return skip;
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}
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#undef CHECKED_MATCH
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#define CHECKED_MATCH(p) else if (strncmp(s, p, sizeof(p) - 1) == 0) return (sizeof(p) - 1)
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static int check_encryption_pattern(const char *s) {
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if (0) {}
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CHECKED_MATCH("forceencrypt");
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CHECKED_MATCH("forcefdeorfbe");
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CHECKED_MATCH("fileencryption");
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else return -1;
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}
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static uint32_t remove_pattern(void *buf, uint32_t size, int(*pattern_skip)(const char *)) {
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auto src = static_cast<char *>(buf);
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int orig_sz = size;
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int write = 0;
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for (int read = 0; read < orig_sz;) {
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if (int skip = pattern_skip(src + read); skip > 0) {
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fprintf(stderr, "Remove pattern [%.*s]\n", skip, src + read);
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size -= skip;
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read += skip;
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} else {
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src[write++] = src[read++];
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}
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}
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memset(src + write, 0, orig_sz - write);
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return size;
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}
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uint32_t patch_verity(void *buf, uint32_t size) {
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return remove_pattern(buf, size, check_verity_pattern);
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}
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uint32_t patch_encryption(void *buf, uint32_t size) {
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return remove_pattern(buf, size, check_encryption_pattern);
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}
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