linux-kernel - Re: [RFD] x86: The future of MPX

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Date:   Sat, 28 Apr 2018 16:36:59 +0000
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [RFD] x86: The future of MPX

On Sat, Apr 28, 2018 at 2:18 AM Ingo Molnar <mingo@...nel.org> 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