mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
39844b7e30
__setup() handlers should return 1 if the parameter is handled.
Returning 0 causes the entire string to be added to init's
environment strings (limited to 32 strings), unnecessarily polluting it.
Using the documented strings "TOMOYO_loader=string1" and
"TOMOYO_trigger=string2" causes an Unknown parameter message:
Unknown kernel command line parameters
"BOOT_IMAGE=/boot/bzImage-517rc5 TOMOYO_loader=string1 \
TOMOYO_trigger=string2", will be passed to user space.
and these strings are added to init's environment string space:
Run /sbin/init as init process
with arguments:
/sbin/init
with environment:
HOME=/
TERM=linux
BOOT_IMAGE=/boot/bzImage-517rc5
TOMOYO_loader=string1
TOMOYO_trigger=string2
With this change, these __setup handlers act as expected,
and init's environment is not polluted with these strings.
Fixes: 0e4ae0e0de ("TOMOYO: Make several options configurable.")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Link: https://lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Cc: James Morris <jmorris@namei.org>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: tomoyo-dev-en@lists.osdn.me
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* security/tomoyo/load_policy.c
|
|
*
|
|
* Copyright (C) 2005-2011 NTT DATA CORPORATION
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
|
|
|
|
/*
|
|
* Path to the policy loader. (default = CONFIG_SECURITY_TOMOYO_POLICY_LOADER)
|
|
*/
|
|
static const char *tomoyo_loader;
|
|
|
|
/**
|
|
* tomoyo_loader_setup - Set policy loader.
|
|
*
|
|
* @str: Program to use as a policy loader (e.g. /sbin/tomoyo-init ).
|
|
*
|
|
* Returns 0.
|
|
*/
|
|
static int __init tomoyo_loader_setup(char *str)
|
|
{
|
|
tomoyo_loader = str;
|
|
return 1;
|
|
}
|
|
|
|
__setup("TOMOYO_loader=", tomoyo_loader_setup);
|
|
|
|
/**
|
|
* tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
|
|
*
|
|
* Returns true if /sbin/tomoyo-init exists, false otherwise.
|
|
*/
|
|
static bool tomoyo_policy_loader_exists(void)
|
|
{
|
|
struct path path;
|
|
|
|
if (!tomoyo_loader)
|
|
tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER;
|
|
if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
|
|
pr_info("Not activating Mandatory Access Control as %s does not exist.\n",
|
|
tomoyo_loader);
|
|
return false;
|
|
}
|
|
path_put(&path);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Path to the trigger. (default = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER)
|
|
*/
|
|
static const char *tomoyo_trigger;
|
|
|
|
/**
|
|
* tomoyo_trigger_setup - Set trigger for activation.
|
|
*
|
|
* @str: Program to use as an activation trigger (e.g. /sbin/init ).
|
|
*
|
|
* Returns 0.
|
|
*/
|
|
static int __init tomoyo_trigger_setup(char *str)
|
|
{
|
|
tomoyo_trigger = str;
|
|
return 1;
|
|
}
|
|
|
|
__setup("TOMOYO_trigger=", tomoyo_trigger_setup);
|
|
|
|
/**
|
|
* tomoyo_load_policy - Run external policy loader to load policy.
|
|
*
|
|
* @filename: The program about to start.
|
|
*
|
|
* This function checks whether @filename is /sbin/init , and if so
|
|
* invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
|
|
* and then continues invocation of /sbin/init.
|
|
* /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
|
|
* writes to /sys/kernel/security/tomoyo/ interfaces.
|
|
*
|
|
* Returns nothing.
|
|
*/
|
|
void tomoyo_load_policy(const char *filename)
|
|
{
|
|
static bool done;
|
|
char *argv[2];
|
|
char *envp[3];
|
|
|
|
if (tomoyo_policy_loaded || done)
|
|
return;
|
|
if (!tomoyo_trigger)
|
|
tomoyo_trigger = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER;
|
|
if (strcmp(filename, tomoyo_trigger))
|
|
return;
|
|
if (!tomoyo_policy_loader_exists())
|
|
return;
|
|
done = true;
|
|
pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader);
|
|
argv[0] = (char *) tomoyo_loader;
|
|
argv[1] = NULL;
|
|
envp[0] = "HOME=/";
|
|
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
|
|
envp[2] = NULL;
|
|
call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
|
|
tomoyo_check_profile();
|
|
}
|
|
|
|
#endif
|