我猜想这个
参数是指相对于一个用户或一个进程，通常不用修改该参数；
strmsgsz
默认值为 65536, 单个系统调用可以传给一个STREAM设备信息的数据部分的最大字节数
；任何write(2)超过这个大小限制会被分为多个信息；
范围为：0到262144 bytes
当出现putmsg(2)系统调用返回ERANGE时，需要修改该参数；
strctlsz
默认值为 65536, 单个系统调用可以传给一个STREAM设备信息的控制部分的最大字节数
；范围：0-MAXINT BYTES；
General Kernel Variables
noexec_user_stack
Warning: This option might crash some of your application software, and
endanger your system's stability!
By default, the Solaris 32 bit application stack memory areas are set
with permissions to read, write and execute, as specified in the SPARC
and Intel ABI. Though many hacks prefer to modify the program counter
saved during a subroutine call, a program snippet in the stack area can
be used to gain root access to a system.
If the variable is set to a non-zero value, the stack defaults to read
and write, but not executable permissions. Most programs, but not all,
will function correctly, if the default stack permissions exclude
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