Signed-off-by: Nganlan <tony.gan@huawei.com>

1. chunk overhead区增加两个字段usize和state，分别记录实际占用的payload的大小以及当前chunk的状态。
其中chunk的状态包括是否分配给用户以及是否被下毒。下毒指的是在chunk除有效payload（即用户实际使用
的内存）外的内存中填充进随机生成的数据。在malloc/free时检测这些区域即可实现对溢出以及UAF的校验。

2. 为了提高性能，并不会对所有chunk下毒，而是每POISON_COUNT_DOWN_BASE次malloc/free时进行一次下毒。
Signed-off-by: NFar <yesiyuan2@huawei.com>
Change-Id: Idb341c202d8ec99f5370d4f589ee261ded8b163f

Signed-off-by: Nganlan <tony.gan@huawei.com>

Signed-off-by: Nganlan <tony.gan@huawei.com>

Signed-off-by: Nganlan <tony.gan@huawei.com>

空闲块释放后，不会立即进入待分配队列或归还给系统，而是被放入一个隔离区。
当隔离区满后，其中的空闲块会被放入待分配队列或归还物理内存给操作系统。
Signed-off-by: NFar <yesiyuan2@huawei.com>
Change-Id: I019c065b2bc52f83655e516e13fcb14420a78861

Signed-off-by: Nganlan <tony.gan@huawei.com>

在32位情况下，由于pretrim的存在，可能导致原用例无法正常进入unbin路径，
进而引起子进程未能按照预期终止。通过更加精细地控制流程及增加malloc次数，
保证进入unbin分支。
malloc-free-performance由于需要打印耗时调用t_printf导致t_status修改为1，
实际无错误，因此避免误报，直接返回0。
Signed-off-by: NFar <yesiyuan2@huawei.com>
Change-Id: I810b7f0b032deed33871e73b4bc428ac3ad13eb8

Signed-off-by: Nganlan <tony.gan@huawei.com>

Signed-off-by: Nganlan <tony.gan@huawei.com>

Signed-off-by: Nganlan <tony.gan@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

1. 指针混淆:
   对空闲chunk的双向链表指针next、prev进行混淆。具体为将该指针与一个key做异或操作。
   不同的bin拥有不同的key，key通过随机数生成器生成。
2. safe unlink:
   在unbin操作时校验双向链表的有效性，即检查双向链表中前一项和后一项的指向当前chunk
   的指针是否正常，否则终止进程。

这两个功能均可通过MALLOC_FREELIST_HARDENED宏开关
这个宏可以通过编译框架直接开关（在编译命令后增加 --gn-args "musl_secure_level=1"打开）

Change-Id: I05fd4404aeebcb396c8471f181a30305fb9dbe74
Signed-off-by: NFar <yesiyuan2@huawei.com>

Signed-off-by: Nganlan <tony.gan@huawei.com>

Need one interface to get dlns, and can set default parent for new namespace. add dlns_create2 interface which caller can create namespace without inherit
from default namespace.

test: creat2 without flags
Signed-off-by: Nhuanghuijin <huanghuijin@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nfangting <fangting10@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nmaweiye <maweiye@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nwangjiahui <wangjiahui27@huawei.com>

Signed-off-by: Nfangting <fangting10@huawei.com>

Signed-off-by: NTimur Valeev <valeev.timur@huawei.com>

This reverts commit fd8c6da6, reversing
changes made to acdab8e8.
Signed-off-by: Nyangwenjun <yangwenjun13@huawei.com>

Revert "!268 Dynamic linker supports namespace mechanism"

This reverts commit acdab8e8, reversing
changes made to 412ca9eb.
Signed-off-by: Njiangkuaixue <jiangchenzhou@huawei.com>

Signed-off-by: Nliuyaning6 <liuyaning6@huawei.com>

Signed-off-by: Nzhushengle <zhushengle@huawei.com>
Change-Id: I1e9c3ee45c16ce719450ab3fe9819e8f608eeb49

Signed-off-by: Nliuyaning6 <liuyaning6@huawei.com>

Signed-off-by: Nyangwenjun <yangwenjun13@huawei.com>

Signed-off-by: Ncaifuzhou <caifuzhou@huawei.com>

Signed-off-by: Ncaifuzhou <caifuzhou@huawei.com>