Move su request path to magisk tmp

app/src/main/java/com/topjohnwu/magisk/core/su/SuRequestHandler.kt

@@ -13,6 +13,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import timber.log.Timber
 import java.io.DataOutputStream
+import java.io.File
 import java.io.FileOutputStream
 import java.io.IOException
 import java.util.concurrent.TimeUnit
@@ -22,7 +23,7 @@ class SuRequestHandler(
     private val policyDB: PolicyDao
 ) {
 
-    private lateinit var output: DataOutputStream
+    private lateinit var output: File
     private lateinit var policy: SuPolicy
     lateinit var pkgInfo: PackageInfo
         private set
@@ -52,42 +53,27 @@ class SuRequestHandler(
         return true
     }
 
-    private fun close() {
-        if (::output.isInitialized)
-            runCatching { output.close() }
-    }
-
     private suspend fun init(intent: Intent): Boolean {
         val uid = intent.getIntExtra("uid", -1)
-        if (uid <= 0) {
-            return false;
-        }
-        policy = SuPolicy(uid)
         val pid = intent.getIntExtra("pid", -1)
-        if (pid <= 0) {
-            return false;
-        }
-        val fifo = intent.getStringExtra("fifo") ?: "/dev/socket/magisk_su_request_$pid"
-
-        try {
-            output = DataOutputStream(FileOutputStream(fifo))
-            try {
-                pkgInfo = pm.getPackageInfo(uid, pid) ?: PackageInfo().apply {
-                    val name = pm.getNameForUid(uid) ?: throw PackageManager.NameNotFoundException()
-                    // We only fill in sharedUserId and leave other fields uninitialized
-                    sharedUserId = name.split(":")[0]
-                }
-            } catch (e: PackageManager.NameNotFoundException) {
-                Timber.e(e)
-                respond(SuPolicy.DENY, -1)
-                return false
-            }
-            return true
-        } catch (e: IOException) {
-            Timber.e(e)
-            close()
+        val fifo = intent.getStringExtra("fifo")
+        if (uid <= 0 || pid <= 0 || fifo == null) {
             return false
         }
+        output = File(fifo)
+        policy = SuPolicy(uid)
+        try {
+            pkgInfo = pm.getPackageInfo(uid, pid) ?: PackageInfo().apply {
+                val name = pm.getNameForUid(uid) ?: throw PackageManager.NameNotFoundException()
+                // We only fill in sharedUserId and leave other fields uninitialized
+                sharedUserId = name.split(":")[0]
+            }
+        } catch (e: PackageManager.NameNotFoundException) {
+            Timber.e(e)
+            respond(SuPolicy.DENY, -1)
+            return false
+        }
+        return output.canWrite()
     }
 
     suspend fun respond(action: Int, time: Int) {
@@ -102,14 +88,15 @@ class SuRequestHandler(
 
         withContext(Dispatchers.IO) {
             try {
-                output.writeInt(policy.policy)
-                output.flush()
+                DataOutputStream(FileOutputStream(output)).use {
+                    it.writeInt(policy.policy)
+                    it.flush()
+                }
             } catch (e: IOException) {
                 Timber.e(e)
-            } finally {
-                close()
-                if (until >= 0)
-                    policyDB.update(policy)
+            }
+            if (until >= 0) {
+                policyDB.update(policy)
             }
         }
     }

native/src/core/su/connect.cpp

@@ -3,11 +3,10 @@
 
 #include <base.hpp>
 #include <selinux.hpp>
+#include <magisk.hpp>
 
 #include "su.hpp"
 
-extern int SDK_INT;
-
 using namespace std;
 
 #define CALL_PROVIDER \
@@ -193,14 +192,15 @@ void app_notify(const su_context &ctx) {
 int app_request(const su_context &ctx) {
     // Create FIFO
     char fifo[64];
-    ssprintf(fifo, sizeof(fifo), "/dev/socket/magisk_su_request_%d", ctx.pid);
+    ssprintf(fifo, sizeof(fifo), "%s/" INTLROOT "/su_request_%d", MAGISKTMP.data(), ctx.pid);
     mkfifo(fifo, 0600);
     chown(fifo, ctx.info->mgr_uid, ctx.info->mgr_uid);
     setfilecon(fifo, MAGISK_FILE_CON);
 
     // Send request
     vector<Extra> extras;
-    extras.reserve(2);
+    extras.reserve(3);
+    extras.emplace_back("fifo", fifo);
     extras.emplace_back("uid", ctx.info->eval_uid);
     extras.emplace_back("pid", ctx.pid);
     exec_cmd("request", extras, ctx.info, false);

native/src/init/mount.cpp

@@ -265,7 +265,7 @@ void MagiskInit::setup_tmp(const char *path) {
     LOGD("Setup Magisk tmp at %s\n", path);
     chdir("/data");
 
-    xmkdir(INTLROOT, 0755);
+    xmkdir(INTLROOT, 0711);
     xmkdir(MIRRDIR, 0);
     xmkdir(BLOCKDIR, 0);
     xmkdir(WORKERDIR, 0);