Revert "Enforce execve() restrictions for API > 28"

This reverts commit 0dd738d8.

Reason for revert: CtsSimpleperfTestCases CTS test case failures.
See b/118704604 for details.

Bug: 112357170
Bug: 118704604
Change-Id: Ibe921f3bbc3404694542ef695883c1a30777d68b

private/app_neverallows.te

@@ -40,16 +40,6 @@ neverallow { all_untrusted_apps -mediaprovider } property_type:property_service
 # but otherwise disallow untrusted apps from reading this property.
 neverallow { all_untrusted_apps -untrusted_app_25 } net_dns_prop:file read;
 
-# Block calling execve() on files in an apps home directory.
-# This is a W^X violation (loading executable code from a writable
-# home directory). For compatibility, allow for targetApi <= 28.
-# b/112357170
-neverallow {
-  all_untrusted_apps
-  -untrusted_app_25
-  -untrusted_app_27
-} { app_data_file privapp_data_file }:file execute_no_trans;
-
 # Do not allow untrusted apps to be assigned mlstrustedsubject.
 # This would undermine the per-user isolation model being
 # enforced via levelFrom=user in seapp_contexts and the mls

private/seapp_contexts

@@ -113,7 +113,6 @@ user=_app seinfo=media domain=mediaprovider name=android.process.media type=app_
 user=_app seinfo=platform domain=platform_app type=app_data_file levelFrom=user
 user=_app isV2App=true isEphemeralApp=true domain=ephemeral_app type=app_data_file levelFrom=all
 user=_app isPrivApp=true domain=priv_app type=privapp_data_file levelFrom=user
-user=_app minTargetSdkVersion=29 domain=untrusted_app type=app_data_file levelFrom=all
-user=_app minTargetSdkVersion=28 domain=untrusted_app_27 type=app_data_file levelFrom=all
+user=_app minTargetSdkVersion=28 domain=untrusted_app type=app_data_file levelFrom=all
 user=_app minTargetSdkVersion=26 domain=untrusted_app_27 type=app_data_file levelFrom=user
 user=_app domain=untrusted_app_25 type=app_data_file levelFrom=user

private/untrusted_app_25.te

@@ -44,8 +44,3 @@ allow untrusted_app_25 proc_tty_drivers:file r_file_perms;
 # Text relocation support for API < 23
 # https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#text-relocations-enforced-for-api-level-23
 allow untrusted_app_25 { apk_data_file app_data_file asec_public_file }:file execmod;
-
-# The ability to call exec() on files in the apps home directories
-# for targetApi<=25. This is also allowed for targetAPIs 26, 27,
-# and 28 in untrusted_app_27.te.
-allow untrusted_app_25 app_data_file:file execute_no_trans;

private/untrusted_app_27.te

@@ -2,7 +2,7 @@
 ### Untrusted_27.
 ###
 ### This file defines the rules for untrusted apps running with
-### 25 < targetSdkVersion <= 28.
+### 25 < targetSdkVersion <= 27.
 ###
 ### This file defines the rules for untrusted apps.
 ### Apps are labeled based on mac_permissions.xml (maps signer and
@@ -26,7 +26,3 @@ app_domain(untrusted_app_27)
 untrusted_app_domain(untrusted_app_27)
 net_domain(untrusted_app_27)
 bluetooth_domain(untrusted_app_27)
-
-# The ability to call exec() on files in the apps home directories
-# for targetApi 26, 27, and 28.
-allow untrusted_app_27 app_data_file:file execute_no_trans;

private/untrusted_app_all.te

@@ -22,7 +22,7 @@
 
 # Some apps ship with shared libraries and binaries that they write out
 # to their sandbox directory and then execute.
-allow untrusted_app_all { app_data_file privapp_data_file }:file { r_file_perms execute };
+allow untrusted_app_all { app_data_file privapp_data_file }:file { rx_file_perms };
 
 # ASEC
 allow untrusted_app_all asec_apk_file:file r_file_perms;