linux-kernel - Re: [PATCH] selftests/x86: add "ffff8" -- kernel memory scanner

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Message-ID: <Y1z2L8aAq7sOWxQT@p183>
Date:   Sat, 29 Oct 2022 12:45:19 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] selftests/x86: add "ffff8" -- kernel memory scanner

On Sat, Oct 29, 2022 at 09:14:44AM +0700, Bagas Sanjaya wrote:
> On Fri, Oct 28, 2022 at 10:33:49PM +0300, Alexey Dobriyan wrote:
> > 
> > I've tested it with kernel patch which installs rogue page and it was found.
> > 
> > 	$ ./a.out -h
> > 	usage: ./a.out [-f] [-r] [-n N] [-s S]
> > 	        -f: sequential scan
> > 	        -r: random scan (default)
> > 	        -n: use N threads (default: $(nproc))
> > 	        -s: lowest address shift (default: 47)
> > 	        -t: time to run (default: 256 seconds)
> > 
> > Intended usages are:
> > 
> > 	$ ./a.out -f		# full scan on all cores
> > or
> > 	$ ./a.out -r -t ...	# time limited random scan for QA test
> > 
> 
> The executable name is a.out, really?

This is copypasta from my internal git.

It will be named ffff8_64 by the build system.