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authorStephen Smalley <sds@tycho.nsa.gov>2007-04-19 14:16:19 -0400
committerJames Morris <jmorris@namei.org>2007-04-26 01:36:13 -0400
commite900a7d90ae1486ac95c10e0b7337fc2c2eda529 (patch)
tree924c8b62c3c02d600a02c87bd2a7ed44d39a808b /security
parentbce34bc0eef03c68b5c49a3cc5bc77c84760cfe2 (diff)
downloadlinux-2.6.34-ux500-e900a7d90ae1486ac95c10e0b7337fc2c2eda529.tar.gz
selinux: preserve boolean values across policy reloads
At present, the userland policy loading code has to go through contortions to preserve boolean values across policy reloads, and cannot do so atomically. As this is what we always want to do for reloads, let the kernel preserve them instead. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Karl MacMillan <kmacmillan@mentalrootkit.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/ss/services.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 21b8318979e..40660ffd49b 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1257,6 +1257,7 @@ bad:
}
extern void selinux_complete_init(void);
+static int security_preserve_bools(struct policydb *p);
/**
* security_load_policy - Load a security policy configuration.
@@ -1333,6 +1334,12 @@ int security_load_policy(void *data, size_t len)
goto err;
}
+ rc = security_preserve_bools(&newpolicydb);
+ if (rc) {
+ printk(KERN_ERR "security: unable to preserve booleans\n");
+ goto err;
+ }
+
/* Clone the SID table. */
sidtab_shutdown(&sidtab);
if (sidtab_map(&sidtab, clone_sid, &newsidtab)) {
@@ -1890,6 +1897,37 @@ out:
return rc;
}
+static int security_preserve_bools(struct policydb *p)
+{
+ int rc, nbools = 0, *bvalues = NULL, i;
+ char **bnames = NULL;
+ struct cond_bool_datum *booldatum;
+ struct cond_node *cur;
+
+ rc = security_get_bools(&nbools, &bnames, &bvalues);
+ if (rc)
+ goto out;
+ for (i = 0; i < nbools; i++) {
+ booldatum = hashtab_search(p->p_bools.table, bnames[i]);
+ if (booldatum)
+ booldatum->state = bvalues[i];
+ }
+ for (cur = p->cond_list; cur != NULL; cur = cur->next) {
+ rc = evaluate_cond_node(p, cur);
+ if (rc)
+ goto out;
+ }
+
+out:
+ if (bnames) {
+ for (i = 0; i < nbools; i++)
+ kfree(bnames[i]);
+ }
+ kfree(bnames);
+ kfree(bvalues);
+ return rc;
+}
+
/*
* security_sid_mls_copy() - computes a new sid based on the given
* sid and the mls portion of mls_sid.