Merge "Revert "Reset stack guard after fork from Zygote"" am: 36ea7d5a37 am: 4f37f950e6 am: d517b25c2d

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2130633

Change-Id: I9dff524a3b4767070de33e7beac986a85f62dda2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

3 files changed, 0 insertions, 24 deletions

diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp
index 5cb0de324106..34fd478baeda 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -94,10 +94,6 @@
 
 #include "nativebridge/native_bridge.h"
 
-#if defined(__BIONIC__)
-extern "C" void android_reset_stack_guards();
-#endif
-
 namespace {
 
 // TODO (chriswailes): Add a function to initialize native Zygote data.
@@ -416,7 +412,6 @@ static void sendSigChildStatus(const pid_t pid, const uid_t uid, const int statu
 }
 
 // This signal handler is for zygote mode, since the zygote must reap its children
-NO_STACK_PROTECTOR
 static void SigChldHandler(int /*signal_number*/, siginfo_t* info, void* /*ucontext*/) {
     pid_t pid;
     int status;
@@ -2047,7 +2042,6 @@ static std::set<int>* gPreloadFds = nullptr;
 static bool gPreloadFdsExtracted = false;
 
 // Utility routine to fork a process from the zygote.
-NO_STACK_PROTECTOR
 pid_t zygote::ForkCommon(JNIEnv* env, bool is_system_server,
                          const std::vector<int>& fds_to_close,
                          const std::vector<int>& fds_to_ignore,
@@ -2104,11 +2098,6 @@ pid_t zygote::ForkCommon(JNIEnv* env, bool is_system_server,
       setpriority(PRIO_PROCESS, 0, PROCESS_PRIORITY_MIN);
     }
 
-#if defined(__BIONIC__)
-    // Reset the stack guard for the new process.
-    android_reset_stack_guards();
-#endif
-
     // The child process.
     PreApplicationInit();
 
@@ -2141,7 +2130,6 @@ static void com_android_internal_os_Zygote_nativePreApplicationInit(JNIEnv*, jcl
   PreApplicationInit();
 }
 
-NO_STACK_PROTECTOR
 static jint com_android_internal_os_Zygote_nativeForkAndSpecialize(
         JNIEnv* env, jclass, jint uid, jint gid, jintArray gids, jint runtime_flags,
         jobjectArray rlimits, jint mount_external, jstring se_info, jstring nice_name,
@@ -2196,7 +2184,6 @@ static jint com_android_internal_os_Zygote_nativeForkAndSpecialize(
     return pid;
 }
 
-NO_STACK_PROTECTOR
 static jint com_android_internal_os_Zygote_nativeForkSystemServer(
         JNIEnv* env, jclass, uid_t uid, gid_t gid, jintArray gids,
         jint runtime_flags, jobjectArray rlimits, jlong permitted_capabilities,
@@ -2268,7 +2255,6 @@ static jint com_android_internal_os_Zygote_nativeForkSystemServer(
  * @param is_priority_fork  Controls the nice level assigned to the newly created process
  * @return child pid in the parent, 0 in the child
  */
-NO_STACK_PROTECTOR
 static jint com_android_internal_os_Zygote_nativeForkApp(JNIEnv* env,
                                                          jclass,
                                                          jint read_pipe_fd,
@@ -2283,7 +2269,6 @@ static jint com_android_internal_os_Zygote_nativeForkApp(JNIEnv* env,
                             args_known == JNI_TRUE, is_priority_fork == JNI_TRUE, true);
 }
 
-NO_STACK_PROTECTOR
 int zygote::forkApp(JNIEnv* env,
                     int read_pipe_fd,
                     int write_pipe_fd,
diff --git a/core/jni/com_android_internal_os_Zygote.h b/core/jni/com_android_internal_os_Zygote.h
index 15f53e0814e3..b87396cbd5f5 100644
--- a/core/jni/com_android_internal_os_Zygote.h
+++ b/core/jni/com_android_internal_os_Zygote.h
@@ -20,14 +20,6 @@
 #define LOG_TAG "Zygote"
 #define ATRACE_TAG ATRACE_TAG_DALVIK
 
-/*
- * All functions that lead to ForkCommon must be marked with the
- * no_stack_protector attributed.  Because ForkCommon changes the stack
- * protector cookie, all of the guard checks on the frames above ForkCommon
- * would fail when they are popped.
- */
-#define NO_STACK_PROTECTOR __attribute__((no_stack_protector))
-
 #include <jni.h>
 #include <vector>
 #include <android-base/stringprintf.h>
diff --git a/core/jni/com_android_internal_os_ZygoteCommandBuffer.cpp b/core/jni/com_android_internal_os_ZygoteCommandBuffer.cpp
index 2b5b8f7a108e..add645dee718 100644
--- a/core/jni/com_android_internal_os_ZygoteCommandBuffer.cpp
+++ b/core/jni/com_android_internal_os_ZygoteCommandBuffer.cpp
@@ -377,7 +377,6 @@ void com_android_internal_os_ZygoteCommandBuffer_nativeReadFullyAndReset(JNIEnv*
 // We only process fork commands if the peer uid matches expected_uid.
 // For every fork command after the first, we check that the requested uid is at
 // least minUid.
-NO_STACK_PROTECTOR
 jboolean com_android_internal_os_ZygoteCommandBuffer_nativeForkRepeatedly(
             JNIEnv* env,
             jclass,