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Yama: remove needless CONFIG_SECURITY_YAMA_STACKED

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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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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();
}