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Commit 8baf2c2b authored by Steven Moreland's avatar Steven Moreland
Browse files

Zygote: disable heap 0'ing in apps. 

Uninitialized memory back by popular demand.

We have trialed heap 0'ing (malloc is calloc) in Android for a few days
in all processes, but there are a couple of signs that doing this in app
processes may be too ambitious.

Bug: 170891666
Bug: 131355925

Test: boot, see disable logs
Change-Id: I60563712c8af459f2f847b4598477b042a05d7ea
parent f83bccb0

core/jni/com_android_internal_os_Zygote.cpp

+8 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ 
#include <bionic/mte.h>

#include <bionic/mte_kernel.h>

#include <cutils/fs.h>

#include <cutils/memory.h>

#include <cutils/multiuser.h>

#include <cutils/sockets.h>

#include <private/android_filesystem_config.h>
@@ -647,6 +648,13 @@ static void PreApplicationInit() { 


  // Set the jemalloc decay time to 1.

  mallopt(M_DECAY_TIME, 1);



  // Avoid potentially expensive memory mitigations, mostly meant for system

  // processes, in apps. These may cause app compat problems, use more memory,

  // or reduce performance. While it would be nice to have them for apps,

  // we will have to wait until they are proven out, have more efficient

  // hardware, and/or apply them only to new applications.

  process_disable_memory_mitigations();

}



static void SetUpSeccompFilter(uid_t uid, bool is_child_zygote) {