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49 lines
2.0 KiB
Diff
49 lines
2.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Martijn Coenen <maco@google.com>
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Date: Thu, 29 Feb 2024 12:03:05 +0000
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Subject: [PATCH] Verify UID of incoming Zygote connections.
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Only the system UID should be allowed to connect to the Zygote. While
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for generic Zygotes this is also covered by SELinux policy, this is not
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true for App Zygotes: the preload code running in an app zygote could
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connect to another app zygote socket, if it had access to its (random)
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socket address.
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On the Java layer, simply check the UID when the connection is made. In
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the native layer, this check was already present, but it actually didn't
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work in the case where we receive a new incoming connection on the
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socket, and receive a 'non-fork' command: in that case, we will simply
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exit the native loop, and let the Java layer handle the command, without
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any further UID checking.
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Modified the native logic to drop new connections with a mismatching
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UID, and to keep serving the existing connection (if it was still
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there).
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[Backport: No native layer for ZygoteCommandBuffer present]
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Bug: 319081336
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Test: manual
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(cherry picked from commit 2ffc7cb220e4220b7e108c4043a3f0f2a85b6508)
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(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e397fd3d20c3f409311e411387ec1524ccecf085)
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Merged-In: I3f85a17107849e2cd3e82d6ef15c90b9e2f26532
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Change-Id: I3f85a17107849e2cd3e82d6ef15c90b9e2f26532
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---
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core/java/com/android/internal/os/ZygoteConnection.java | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/core/java/com/android/internal/os/ZygoteConnection.java b/core/java/com/android/internal/os/ZygoteConnection.java
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index f537e3e2897b..522da894fd0f 100644
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--- a/core/java/com/android/internal/os/ZygoteConnection.java
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+++ b/core/java/com/android/internal/os/ZygoteConnection.java
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@@ -100,6 +100,9 @@ class ZygoteConnection {
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throw ex;
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}
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+ if (peer.getUid() != Process.SYSTEM_UID) {
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+ throw new ZygoteSecurityException("Only system UID is allowed to connect to Zygote.");
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+ }
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isEof = false;
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}
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