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Message-ID: <20171001001105.GA10409@eros>
Date: Sun, 1 Oct 2017 11:11:05 +1100
From: "Tobin C. Harding" <me@...in.cc>
To: Greg KH <gregkh@...uxfoundation.org>, Petr Mladek <pmladek@...e.com>,
Joe Perches <joe@...ches.com>, Ian Campbell <ijc@...lion.org.uk>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: 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 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");
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