From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH V11 2/5] vsprintf: refactor %pK code out of pointer()
Date: Tue, 28 Nov 2017 21:39:57 -0500
Message-ID: <20171128213957.2edf5069@gandalf.local.home>
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Cc: kernel-hardening@lists.openwall.com,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Theodore Ts'o <tytso@mit.edu>,
        Kees Cook <keescook@chromium.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Tycho Andersen <tycho@tycho.ws>,
        "Roberts, William C" <william.c.roberts@intel.com>,
        Tejun Heo <tj@kernel.org>,
        Jordan Glover <Golden_Miller83@protonmail.ch>,
        Greg KH <gregkh@linuxfoundation.org>,
        Petr Mladek <pmladek@suse.com>, Joe Perches <joe@perches.com>,
        Ian Campbell <ijc@hellion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <wilal.deacon@arm.com>,
        Chris Fries <cfries@google.com>,
        Dave Weinstein <olorin@google.com>,
        Daniel Micay <danielmicay@gmai
To: "Tobin C. Harding" <me@tobin.cc>
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On Wed, 29 Nov 2017 13:05:02 +1100
"Tobin C. Harding" <me@tobin.cc> wrote:

> +		/*
> +		 * kptr_restrict==1 cannot be used in IRQ context
> +		 * because its test for CAP_SYSLOG would be meaningless.
> +		 */
> +		if (in_irq() || in_serving_softirq() || in_nmi())

This could be replaced with:

		if (!in_task())

Which is actually more efficient.

-- Steve

> +			return string(buf, end, "pK-error", spec);