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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
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/*
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* security/tomoyo/load_policy.c
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*
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* Copyright (C) 2005-2011 NTT DATA CORPORATION
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*/
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#include "common.h"
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#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
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/*
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* Path to the policy loader. (default = CONFIG_SECURITY_TOMOYO_POLICY_LOADER)
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*/
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static const char *tomoyo_loader;
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/**
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* tomoyo_loader_setup - Set policy loader.
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*
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* @str: Program to use as a policy loader (e.g. /sbin/tomoyo-init ).
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*
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* Returns 0.
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*/
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static int __init tomoyo_loader_setup(char *str)
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{
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tomoyo_loader = str;
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return 1;
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}
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__setup("TOMOYO_loader=", tomoyo_loader_setup);
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/**
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* tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
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*
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* Returns true if /sbin/tomoyo-init exists, false otherwise.
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*/
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static bool tomoyo_policy_loader_exists(void)
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{
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struct path path;
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if (!tomoyo_loader)
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tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER;
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if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
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pr_info("Not activating Mandatory Access Control as %s does not exist.\n",
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tomoyo_loader);
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return false;
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}
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path_put(&path);
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return true;
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}
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/*
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* Path to the trigger. (default = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER)
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*/
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static const char *tomoyo_trigger;
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/**
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* tomoyo_trigger_setup - Set trigger for activation.
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*
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* @str: Program to use as an activation trigger (e.g. /sbin/init ).
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*
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* Returns 0.
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*/
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static int __init tomoyo_trigger_setup(char *str)
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{
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tomoyo_trigger = str;
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return 1;
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}
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__setup("TOMOYO_trigger=", tomoyo_trigger_setup);
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/**
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* tomoyo_load_policy - Run external policy loader to load policy.
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*
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* @filename: The program about to start.
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*
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* This function checks whether @filename is /sbin/init , and if so
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* invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
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* and then continues invocation of /sbin/init.
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* /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
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* writes to /sys/kernel/security/tomoyo/ interfaces.
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*
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* Returns nothing.
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*/
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void tomoyo_load_policy(const char *filename)
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{
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static bool done;
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char *argv[2];
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char *envp[3];
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if (tomoyo_policy_loaded || done)
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return;
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if (!tomoyo_trigger)
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tomoyo_trigger = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER;
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if (strcmp(filename, tomoyo_trigger))
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return;
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if (!tomoyo_policy_loader_exists())
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return;
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done = true;
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pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader);
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argv[0] = (char *) tomoyo_loader;
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argv[1] = NULL;
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envp[0] = "HOME=/";
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envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
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envp[2] = NULL;
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call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
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tomoyo_check_profile();
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}
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#endif
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