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Support Android Q new init setup

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This commit is contained in:
topjohnwu
2019-03-03 06:35:25 -05:00
parent e8f35b02ca
commit 14ae29d907
4 changed files with 28 additions and 11 deletions
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27
native/jni/core/init.cpp
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@@ -281,14 +281,29 @@ static bool patch_sepolicy() {
}
if (init_patch) {
// Force init to load /sepolicy
uint8_t *addr;
// If init is symlink, copy it to rootfs so we can patch
char real_init[128];
real_init[0] = '\0';
struct stat st;
lstat("/init", &st);
if (S_ISLNK(st.st_mode)) {
xreadlink("/init", real_init, sizeof(real_init));
cp_afc(real_init, "/init");
}
size_t real_init_len = strlen(real_init);
char *addr;
size_t size;
mmap_rw("/init", addr, size);
for (int i = 0; i < size; ++i) {
if (memcmp(addr + i, SPLIT_PLAT_CIL, sizeof(SPLIT_PLAT_CIL) - 1) == 0) {
memcpy(addr + i + sizeof(SPLIT_PLAT_CIL) - 4, "xxx", 3);
break;
for (char *p = addr; p < addr + size; ++p) {
if (memcmp(p, SPLIT_PLAT_CIL, sizeof(SPLIT_PLAT_CIL)) == 0) {
// Force init to load /sepolicy
memset(p, 'x', sizeof(SPLIT_PLAT_CIL) - 1);
p += sizeof(SPLIT_PLAT_CIL) - 1;
} else if (real_init_len > 0 && memcmp(p, real_init, real_init_len + 1) == 0) {
// Force execute /init instead of real init
strcpy(p, "/init");
p += real_init_len;
}
}
munmap(addr, size);