Re: [RFC PATCH] bpf: Add helpers to read useful task_struct members

On 11/7/17 12:55 AM, Naveen N. Rao wrote:

quoted

I thought such struct shouldn't change layout.
If it is we need to fix include/linux/compiler-clang.h to do that
anon struct as well.

We considered that, but it looked to be very dependent on the version of
gcc used to build the kernel. But, this may be a simpler approach for
the shorter term.

why it would depend on version of gcc?
We just need this, no?

diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index de179993e039..4e29ab6187cb 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h

@@ -15,3 +15,6 @@
   * with any version that can compile the kernel
   */
  #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), 

__COUNTER__)
+
+#define randomized_struct_fields_start struct {
+#define randomized_struct_fields_end   };

since offsets are mandated by C standard.