On Wed, 2018-07-11 at 10:27 +0200, Pavel Machek wrote:

On Tue 2018-07-10 15:26:17, Yu-cheng Yu wrote:

quoted

Explain how CET works and the no_cet_shstk/no_cet_ibt kernel
parameters.

--- /dev/null
+++ b/Documentation/x86/intel_cet.txt

@@ -0,0 +1,250 @@
+=========================================
+Control Flow Enforcement Technology (CET)
+=========================================

We normally use .rst for this kind of formatted text.

I will change this to a .rst file.

quoted

+[6] The implementation of the SHSTK
+===================================
+
+SHSTK size
+----------
+
+A task's SHSTK is allocated from memory to a fixed size that can
+support 32 KB nested function calls; that is 256 KB for a 64-bit
+application and 128 KB for a 32-bit application.  The system admin
+can change the default size.

How does admin change that? We already have ulimit for stack size,
should those be somehow tied together?

$ ulimit -a
...
stack size              (kbytes, -s) 8192

We can do that.  This makes sense to me.

Yu-cheng