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41 lines
2.1 KiB
Diff
41 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Guojing Yuan <guojing@google.com>
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Date: Thu, 14 Dec 2023 19:30:04 +0000
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Subject: [PATCH] Check permissions for CDM shell commands
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Override handleShellCommand instead of onShellCommand because
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Binder.onShellCommand checks the necessary permissions of the caller.
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Backport by mse1969@posteo.de:
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In Pie, method handleShellCommand does not exist, only Binder.onShellCommand, in which
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the caller uid check isn't yet implemented. Backport: Take over the uid check from A11
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and implement it in the method override.
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Bug: 313428840
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Test: manually tested CDM shell commands
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(cherry picked from commit 1761a0fee9c2cd9787bbb7fbdbe30b4c2b03396e)
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:8d008c61451dba86aa9f14c6bcd661db2cea4856)
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Merged-In: I5539b3594feb5544c458c0fd1061b51a0a808900
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Change-Id: I5539b3594feb5544c458c0fd1061b51a0a808900
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---
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.../server/companion/CompanionDeviceManagerService.java | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/services/companion/java/com/android/server/companion/CompanionDeviceManagerService.java b/services/companion/java/com/android/server/companion/CompanionDeviceManagerService.java
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index 087fe8560fc8..8ffb53f8a3b9 100644
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--- a/services/companion/java/com/android/server/companion/CompanionDeviceManagerService.java
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+++ b/services/companion/java/com/android/server/companion/CompanionDeviceManagerService.java
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@@ -345,6 +345,11 @@ public class CompanionDeviceManagerService extends SystemService implements Bind
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public void onShellCommand(FileDescriptor in, FileDescriptor out, FileDescriptor err,
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String[] args, ShellCallback callback, ResultReceiver resultReceiver)
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throws RemoteException {
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+ final int callingUid = Binder.getCallingUid();
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+ if (callingUid != Process.ROOT_UID && callingUid != Process.SHELL_UID) {
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+ resultReceiver.send(-1, null);
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+ throw new RemoteException("Shell commands are only callable by ADB");
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+ }
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new ShellCmd().exec(this, in, out, err, args, callback, resultReceiver);
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}
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}
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