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Prevent Samsung KNOX hijacking stdout

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This commit is contained in:
Mygod
2020-07-28 03:16:01 +08:00
parent 8908605767
commit 680021a27b
1 changed files with 6 additions and 2 deletions
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8
mobile/src/main/java/be/mygod/librootkotlinx/RootServer.kt
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@@ -5,6 +5,8 @@ import android.os.Build
import android.os.Looper
import android.os.Parcelable
import android.os.RemoteException
import android.system.Os
import android.system.OsConstants
import android.util.Log
import androidx.collection.LongSparseArray
import androidx.collection.set
@@ -440,12 +442,14 @@ class RootServer @JvmOverloads constructor(private val warnLogger: (String) -> U
val cancellables = LongSparseArray<() -> Unit>()
// thread safety: usage of output should be guarded by callbackWorker
val output = DataOutputStream(System.out.buffered().apply {
val output = DataOutputStream(FileOutputStream(Os.dup(FileDescriptor.out)).buffered().apply {
// prevent future write attempts to System.out, possibly from Samsung changes (again)
Os.dup2(FileDescriptor.err, OsConstants.STDOUT_FILENO)
System.setOut(System.err)
val writer = writer()
writer.appendln(args[0]) // echo ready signal
writer.flush()
})
System.setOut(System.err) // prevent future write attempts to System.out
// thread safety: usage of input should be in main thread
val input = DataInputStream(System.`in`.buffered())
var counter = 0L