Re: [RFD] x86: The future of MPX

[Linus Torvalds]

On Sat, Apr 28, 2018 at 2:18 AM Ingo Molnar <mingo@xxxxxxxxxx> wrote:

> I just tried the MPX testcases with the latest kernel:

>   deimos:~/tip/tools/testing/selftests/x86> ./mpx-mini-test_64

They need to be run as root. They try to access

     /sys/kernel/debug/tracing/set_ftrace_pid
     /sys/kernel/debug/tracing/trace

and that's root-only.

> ... and both of them crashed.

That's just because they use "assert()" to check that the file open worked.

"assert()" is evil and bad bad bad.

                      Linus