zygote64_32.patch

From 8b05a547249114663e6b2b45a59fed4e731d674e Mon Sep 17 00:00:00 2001
From: GitHub Actions <actions@github.com>
Date: Mon, 26 Aug 2024 12:40:47 +0800
Subject: [PATCH] zygote64_32

---
 native/src/init/rootdir.cpp | 48 +++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/native/src/init/rootdir.cpp b/native/src/init/rootdir.cpp
index 2f7ff0b30..2c745d7f4 100644
--- a/native/src/init/rootdir.cpp
+++ b/native/src/init/rootdir.cpp
@@ -16,6 +16,8 @@ static string magic_mount_list;
 
 #define NEW_INITRC_DIR  "/system/etc/init/hw"
 #define INIT_RC         "init.rc"
+#define VENDOR_DIR      "/vendor"
+#define BUILD_PROP      "build.prop"
 
 static void magic_mount(const string &sdir, const string &ddir = "") {
     auto dir = xopen_dir(sdir.data());
@@ -165,6 +167,47 @@ static void patch_rc_scripts(const char *src_path, const char *tmp_path, bool wr
     }
 }
 
+static void patch_build_prop(const char *src_path) {
+    auto src_dir = xopen_dir(src_path);
+    if (!src_dir) return;
+    int src_fd = dirfd(src_dir.get());
+
+    auto dest_dir = [&] {
+        char buf[PATH_MAX] = {};
+        ssprintf(buf, sizeof(buf), ROOTOVL "%s", src_path);
+        xmkdirs(buf, 0755);
+        return xopen_dir(buf);
+    }();
+    if (!dest_dir) return;
+    int dest_fd = dirfd(dest_dir.get());
+
+    {
+        auto src = xopen_file(xopenat(src_fd, BUILD_PROP, O_RDONLY | O_CLOEXEC, 0), "re");
+        if (!src) return;
+        auto dest = xopen_file(
+                xopenat(dest_fd, BUILD_PROP, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, 0), "we");
+        if (!dest) return;
+        LOGD("Patching " BUILD_PROP " in %s\n", src_path);
+        file_readline(false, src.get(), [&dest](string_view line) -> bool {
+            if (line.starts_with("ro.zygote=zygote64")) {
+                fprintf(dest.get(), "ro.zygote=zygote64_32\n");
+                return true;
+            }
+            if (line.starts_with("ro.vendor.product.cpu.abilist=arm64-v8a")) {
+                fprintf(dest.get(), "ro.vendor.product.cpu.abilist=arm64-v8a,armeabi-v7a,armeabi\n");
+                return true;
+            }
+            if (line.starts_with("ro.vendor.product.cpu.abilist32=")) {
+                fprintf(dest.get(), "ro.vendor.product.cpu.abilist32=armeabi-v7a,armeabi\n");
+                return true;
+            }
+            fprintf(dest.get(), "%s", line.data());
+            return true;
+        });
+        fclone_attr(fileno(src.get()), fileno(dest.get()));
+    }
+}
+
 static void load_overlay_rc(const char *overlay) {
     auto dir = open_dir(overlay);
     if (!dir) return;
@@ -324,6 +367,11 @@ void MagiskInit::patch_ro_root() {
         patch_rc_scripts("/", tmp_dir.data(), false);
     }
 
+    // Patch build.prop
+    if (access(VENDOR_DIR "/" BUILD_PROP, F_OK) == 0) {
+        patch_build_prop(VENDOR_DIR);
+    }
+
     // Extract overlay archives
     extract_files(false);
 
-- 
2.43.0