Commit 81200b02 authored by Paul Moore's avatar Paul Moore
Browse files

selinux: checkreqprot is deprecated, add some ssleep() discomfort 



The checkreqprot functionality was disabled by default back in
Linux v4.4 (2015) with commit 2a35d196 ("selinux: change
CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE default") and it was
officially marked as deprecated in Linux v5.7.  It was always a
bit of a hack to workaround very old userspace and to the best of
our knowledge, the checkreqprot functionality has been disabled by
Linux distributions for quite some time.

This patch moves the deprecation messages from KERN_WARNING to
KERN_ERR and adds a five second sleep to anyone using it to help
draw their attention to the deprecation and provide a URL which
helps explain things in more detail.

Signed-off-by: default avatarPaul Moore <paul@paul-moore.com>
parent 43b66662

security/selinux/hooks.c

+3 −1
Original line number Diff line number Diff line
@@ -145,7 +145,7 @@ static int __init checkreqprot_setup(char *str) 
	if (!kstrtoul(str, 0, &checkreqprot)) {

		selinux_checkreqprot_boot = checkreqprot ? 1 : 0;

		if (checkreqprot)

			pr_warn("SELinux: checkreqprot set to 1 via kernel parameter.  This is deprecated and will be rejected in a future kernel release.\n");

			pr_err("SELinux: checkreqprot set to 1 via kernel parameter.  This is deprecated and will be rejected in a future kernel release.\n");

	}

	return 1;

}
@@ -7293,6 +7293,8 @@ static __init int selinux_init(void) 


	memset(&selinux_state, 0, sizeof(selinux_state));

	enforcing_set(&selinux_state, selinux_enforcing_boot);

	if (CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE)

		pr_err("SELinux: CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE is non-zero.  This is deprecated and will be rejected in a future kernel release.\n");

	checkreqprot_set(&selinux_state, selinux_checkreqprot_boot);

	selinux_avc_init(&selinux_state.avc);

	mutex_init(&selinux_state.status_lock);

security/selinux/include/security.h

+6 −0
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
#include <linux/rcupdate.h>

#include <linux/refcount.h>

#include <linux/workqueue.h>

#include <linux/delay.h>

#include <linux/printk.h>

#include "flask.h"

#include "policycap.h"
@@ -150,6 +152,10 @@ static inline bool checkreqprot_get(const struct selinux_state *state) 


static inline void checkreqprot_set(struct selinux_state *state, bool value)

{

	if (value) {

		pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-checkreqprot\n");

		ssleep(5);

	}

	WRITE_ONCE(state->checkreqprot, value);

}

security/selinux/selinuxfs.c

+2 −2
Original line number Diff line number Diff line
@@ -757,7 +757,7 @@ static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, 
		char comm[sizeof(current->comm)];



		memcpy(comm, current->comm, sizeof(comm));

		pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",

		pr_err("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",

		       comm, current->pid);

	}