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selinux: cache zygote context types when loading policy

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They are used by the next commit.
This commit is contained in:
Dmitry Muhomor 2023-09-03 17:33:23 +03:00 committed by Kreciorek
parent 16e5331962
commit fd3f9648e3
2 changed files with 39 additions and 0 deletions
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7
security/selinux/include/security.h
View file

@ -87,6 +87,11 @@ extern int selinux_enabled_boot;
struct selinux_avc;
struct selinux_policy;
struct context_types {
u32 webview_zygote;
u32 zygote;
};
struct selinux_state {
#ifdef CONFIG_SECURITY_SELINUX_DISABLE
bool disabled;
@ -100,6 +105,8 @@ struct selinux_state {
bool android_netlink_route;
bool android_netlink_getneigh;
struct context_types types;
struct page *status_page;
struct mutex status_lock;

32
security/selinux/selinuxfs.c
View file

@ -41,6 +41,8 @@
#include "security.h"
#include "objsec.h"
#include "conditional.h"
#include "ss/services.h"
#include "ss/symtab.h"
enum sel_inos {
SEL_ROOT_INO = 2,
@ -611,6 +613,30 @@ out:
return ret;
}
static int resolve_context_type(struct selinux_load_state *state, const char *name, u32 *out_type)
{
struct type_datum *typdatum = symtab_search(&state->policy->policydb.p_types, name);
if (!typdatum || typdatum->attribute) {
pr_err("SELinux: missing type_datum for %s\n", name);
return -EINVAL;
}
*out_type = typdatum->value;
return 0;
}
static int resolve_context_types(struct selinux_load_state *lstate, struct context_types *types) {
int rc;
#define RESOLVE_TYPE(t) rc = resolve_context_type(lstate, #t, &types->t); if (rc) return rc
RESOLVE_TYPE(webview_zygote);
RESOLVE_TYPE(zygote);
#undef RESOLVE_TYPE
return 0;
}
static ssize_t sel_write_load(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
@ -656,6 +682,12 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
goto out;
}
length = resolve_context_types(&load_state, &fsi->state->types);
if (length) {
selinux_policy_cancel(fsi->state, &load_state);
goto out;
}
selinux_policy_commit(fsi->state, &load_state);
length = count;
audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,