[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20171004104549.GD16685@eros>
Date: Wed, 4 Oct 2017 21:45:49 +1100
From: "Tobin C. Harding" <me@...in.cc>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
Ian Campbell <ijc@...lion.org.uk>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Steven Rostedt <rostedt@...dmis.org>,
William Roberts <william.c.roberts@...el.com>,
Chris Fries <cfries@...gle.com>, Dave Weinstein <olorin@...gle.com>
Subject: Re: [RFC V2 0/6] add more kernel pointer filter
options
On Wed, Oct 04, 2017 at 10:57:56AM +0200, Greg KH wrote:
> On Sun, Oct 01, 2017 at 11:11:05AM +1100, Tobin C. Harding wrote:
> > On Sun, Oct 01, 2017 at 11:06:44AM +1100, Tobin C. Harding wrote:
> > > Version 2 of Greg's patch series with changes made as suggested by comments to V1.
> >
> > Patch set tested by setting /proc/sys/kernel/kptr_restrict and inserting the following module
> >
> > #include <linux/init.h>
> > #include <linux/module.h>
> >
> > #define DRIVER_AUTHOR "Tobin C. Harding <me@...in.cc>"
> > #define DRIVER_DESC "Testing module"
> >
> > static void test_printk(void)
> > {
> > char *ptr = "";
> >
> > pr_alert("printing with p: %p\n", ptr);
> > pr_alert("printing with pK: %pK\n", ptr);
> > pr_alert("printing with pP: %pP\n", ptr);
> >
> > pr_alert("printing with pa: %pa\n", ptr);
> > pr_alert("printing with pad: %pad\n", ptr);
> > pr_alert("printing with pap: %pap\n", ptr);
> >
> > pr_alert("printing with paP: %paP\n", ptr);
> > pr_alert("printing with padP: %padP\n", ptr);
> > pr_alert("printing with papP: %papP\n", ptr);
> >
> > pr_alert("printing with pr: %pr\n", ptr);
> > pr_alert("printing with pR: %pR\n", ptr);
> > }
> >
> > static int hello_init(void)
> > {
> > pr_alert("Hello, world\n");
> >
> > test_printk();
> >
> > return 0;
> > }
> > module_init(hello_init);
> >
> > static void hello_exit(void)
> > {
> > pr_alert("Goodbye, world\n");
> > }
> > module_exit(hello_exit);
> >
> > MODULE_DESCRIPTION(DRIVER_DESC);
> > MODULE_AUTHOR(DRIVER_AUTHOR);
> > MODULE_LICENSE("GPL");
>
>
> Hm, any way to add something like this to the testing infrastructure?
> Or maybe just at boot time? It's nice to keep tests around to ensure
> things do not break :)
Sure, good idea, I'll look into it. It will be my first attempt at adding tests to the kernel so
will come as a separate patch set some time soon.
thanks,
Tobin.
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
