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Yama: remove needless CONFIG_SECURITY_YAMA_STACKED 

Now that minor LSMs can cleanly stack with major LSMs, remove the unneeded
config for Yama to be made to explicitly stack. Just selecting the main
Yama CONFIG will allow it to work, regardless of the major LSM. Since
distros using Yama are already forcing it to stack, this is effectively
a no-op change.

Additionally add MAINTAINERS entry.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Kees Cook 2015-07-23 18:02:48 -07:00 committed by James Morris
parent fe6c59dc17
commit 730daa164e
8 changed files with 28 additions and 52 deletions
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10
Documentation/security/Yama.txt
View File

@ -1,9 +1,7 @@
Yama is a Linux Security Module that collects a number of system-wide DAC
security protections that are not handled by the core kernel itself. To
select it at boot time, specify "security=yama" (though this will disable
any other LSM).
Yama is controlled through sysctl in /proc/sys/kernel/yama:
Yama is a Linux Security Module that collects system-wide DAC security
protections that are not handled by the core kernel itself. This is
selectable at build-time with CONFIG_SECURITY_YAMA, and can be controlled
at run-time through sysctls in /proc/sys/kernel/yama:
- ptrace_scope

6
MAINTAINERS
View File

@ -9102,6 +9102,12 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/jj/apparmor-dev.git
S: Supported
F: security/apparmor/
YAMA SECURITY MODULE
M: Kees Cook <keescook@chromium.org>
T: git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git yama/tip
S: Supported
F: security/yama/
SENSABLE PHANTOM
M: Jiri Slaby <jirislaby@gmail.com>
S: Maintained

1
arch/mips/configs/pistachio_defconfig
View File

@ -320,7 +320,6 @@ CONFIG_KEYS=y
CONFIG_SECURITY=y
CONFIG_SECURITY_NETWORK=y
CONFIG_SECURITY_YAMA=y
CONFIG_SECURITY_YAMA_STACKED=y
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_CRYPTO_AUTHENC=y
CONFIG_CRYPTO_HMAC=y

6
include/linux/lsm_hooks.h
View File

@ -1881,8 +1881,10 @@ static inline void security_delete_hooks(struct security_hook_list *hooks,
extern int __init security_module_enable(const char *module);
extern void __init capability_add_hooks(void);
#ifdef CONFIG_SECURITY_YAMA_STACKED
void __init yama_add_hooks(void);
#ifdef CONFIG_SECURITY_YAMA
extern void __init yama_add_hooks(void);
#else
static inline void __init yama_add_hooks(void) { }
#endif
#endif /* ! __LINUX_LSM_HOOKS_H */

5
security/Kconfig
View File

@ -132,7 +132,6 @@ choice
default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
default DEFAULT_SECURITY_YAMA if SECURITY_YAMA
default DEFAULT_SECURITY_DAC
help
@ -151,9 +150,6 @@ choice
config DEFAULT_SECURITY_APPARMOR
bool "AppArmor" if SECURITY_APPARMOR=y
config DEFAULT_SECURITY_YAMA
bool "Yama" if SECURITY_YAMA=y
config DEFAULT_SECURITY_DAC
bool "Unix Discretionary Access Controls"
@ -165,7 +161,6 @@ config DEFAULT_SECURITY
default "smack" if DEFAULT_SECURITY_SMACK
default "tomoyo" if DEFAULT_SECURITY_TOMOYO
default "apparmor" if DEFAULT_SECURITY_APPARMOR
default "yama" if DEFAULT_SECURITY_YAMA
default "" if DEFAULT_SECURITY_DAC
endmenu

11
security/security.c
View File

@ -56,18 +56,13 @@ int __init security_init(void)
pr_info("Security Framework initialized\n");
/*
* Always load the capability module.
* Load minor LSMs, with the capability module always first.
*/
capability_add_hooks();
#ifdef CONFIG_SECURITY_YAMA_STACKED
/*
* If Yama is configured for stacking load it next.
*/
yama_add_hooks();
#endif
/*
* Load the chosen module if there is one.
* This will also find yama if it is stacking
* Load all the remaining security modules.
*/
do_security_initcalls();

9
security/yama/Kconfig
View File

@ -6,14 +6,7 @@ config SECURITY_YAMA
This selects Yama, which extends DAC support with additional
system-wide security settings beyond regular Linux discretionary
access controls. Currently available is ptrace scope restriction.
Like capabilities, this security module stacks with other LSMs.
Further information can be found in Documentation/security/Yama.txt.
If you are unsure how to answer this question, answer N.
config SECURITY_YAMA_STACKED
bool "Yama stacked with other LSMs"
depends on SECURITY_YAMA
default n
help
When Yama is built into the kernel, force it to stack with the
selected primary LSM.

32
security/yama/yama_lsm.c
View File

@ -353,11 +353,6 @@ static struct security_hook_list yama_hooks[] = {
LSM_HOOK_INIT(task_free, yama_task_free),
};
void __init yama_add_hooks(void)
{
security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks));
}
#ifdef CONFIG_SYSCTL
static int yama_dointvec_minmax(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
@ -396,25 +391,18 @@ static struct ctl_table yama_sysctl_table[] = {
},
{ }
};
#endif /* CONFIG_SYSCTL */
static __init int yama_init(void)
static void __init yama_init_sysctl(void)
{
#ifndef CONFIG_SECURITY_YAMA_STACKED
/*
* If yama is being stacked this is already taken care of.
*/
if (!security_module_enable("yama"))
return 0;
#endif
pr_info("Yama: becoming mindful.\n");
#ifdef CONFIG_SYSCTL
if (!register_sysctl_paths(yama_sysctl_path, yama_sysctl_table))
panic("Yama: sysctl registration failed.\n");
#endif
return 0;
}
#else
static inline void yama_init_sysctl(void) { }
#endif /* CONFIG_SYSCTL */
security_initcall(yama_init);
void __init yama_add_hooks(void)
{
pr_info("Yama: becoming mindful.\n");
security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks));
yama_init_sysctl();
}