linux-kernel - Re: [lkp-robot] [include/linux/string.h] 6974f0c455: kernel_BUG_at

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Date:   Fri, 21 Jul 2017 12:29:45 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     kernel test robot <xiaolong.ye@...el.com>,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        Daniel Micay <danielmicay@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Axtens <dja@...ens.net>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [lkp-robot] [include/linux/string.h] 6974f0c455:
 kernel_BUG_at_lib/string.c

On Thu, 20 Jul 2017 11:41:38 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Thu, Jul 20, 2017 at 8:51 AM, Masami Hiramatsu <mhiramat@...nel.org> wrote:
> >
> > Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> > Tested-by: Masami Hiramatsu <mhiramat@...nel.org>
> 
> Ok, I committed that patch as-is.
> 
> Other architectures may end up with the same issue, unless they really
> happen to have just a single instruction that fits in their
> kprobe_opcode_t type in their templates. But I didn't touch any of
> their (similar) code, since it will need testing.

Similar optprobe code are in arm and powerpc, arm does not support
FORTIFY_SOURCE (yet), and powerpc already fixed that same way.
So I'll make a same fix on arm before traped to the same issue.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>